P01
Presence of Second Mesiobuccal Canal of Permanent Maxillary First Molars is Related to the Existence of Multiple Roots in Permanent Maxillary First Premolars: A CBCT Study in a Taiwanese Population
Dai ZJ ▲ Chen YJ Shieh YS Wu YC*
Department of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and
National Defense Medical University, Taipei, Taiwan
Understanding root and canal morphology is critical for successful endodontic treatment. Detecting
predictors of a second mesiobuccal (MB2) canal in permanent maxillary first molars (PMFMs) may improve
diagnostic accuracy. This study examined the relationship between root number of permanent maxillary
first premolars (PMFPs) and MB2 occurrence in PMFMs in a Taiwanese population. CBCT scans from 645
patients were reviewed, and 188 met the inclusion criteria, yielding 752 teeth (376 PMFPs, 376 PMFMs).
Root number and canal morphology were classified using Vertucci’s system. MB2 prevalence and bilateral
symmetry were assessed. Associations between PMFP root number and MB2 occurrence were analyzed with
chi-square tests and multivariable logistic regression adjusted for sex, age, and side. Among PMFPs, 60.9%
had one root, 37.5% had two roots, and 1.6% had three roots. In single-rooted PMFPs, the most common
configurations were Types I, III, IV, and II. In PMFMs, the mesiobuccal root most frequently showed Type
I (42.0%), followed by Type IV (30.8%) and Type II (23.6%). Males had a higher prevalence of multi-
rooted PMFPs and MB2 canals than females. Logistic regression revealed that multiple-rooted PMFPs were
independently associated with MB2 occurrence in PMFMs, with an adjusted odds ratio of 2.081 (p < 0.001).
Bilateral symmetry was high in both PMFP root number (81.4%) and MB2 presence (85.1%). Multiple-
rooted PMFPs were strongly correlated with MB2 occurrence in PMFMs. PMFP morphology may serve as a
predictive indicator for MB2 detection.
P02
Complex Root Canals of Maxillary Second Premolars Are Associated with the Occurrence of Multiple Roots in Maxillary First Ppremolars: A Cross-Sectional Cone-beam Computed Tomography Study in a Taiwanese Population
Chen YJ ▲1 Dai ZJ1 Shieh YS1,2 Wu YC*1
1Department of Operative Dentistry and Endodontics, College of Oral Medicine,
Tri-Service General Hospital and National Defense Medical University
2Department and Graduate Institute of Biochemistry, National Defense Medical University
This retrospective cone-beam computed tomography (CBCT) study investigated the association between
the root number of permanent maxillary first premolars (PMFPs) and the canal complexity of adjacent
permanent maxillary second premolars (PMSPs) in a Taiwanese population. CBCT images of 600 fully
developed, untreated teeth (300 PMFPs and 300 PMSPs) from 150 patients (69 females, 81 males; aged
20–83 years) were analyzed. PMSP canal morphology was categorized using Vertucci’s classification, and
multivariable logistic regression was adjusted for sex, age, and side. Results showed that 56% of PMFPs were
single-rooted and 44% were multi-rooted. For PMSPs, 46.7% exhibited complex canal systems, predominantly
featuring Vertucci Type I (53.3%), Type III (16.7%), and Type II (12.3%). Males had a significantly higher
prevalence of multi-rooted PMFPs and complex PMSP canals (p < 0.05). Multivariable regression revealed
that multi-rooted PMFPs were significantly associated with complex PMSP canals, presenting an adjusted
odds ratio of 2.507 (p < 0.001). Furthermore, high bilateral consistency was observed for both PMFP root
number (77.3%) and PMSP canal category (81.3%). In conclusion, a significant anatomical correlation exists
between PMFP root number and PMSP canal complexity. Multi-rooted PMFPs serve as a strong predictor for
complex PMSP canal systems, and high bilateral symmetry supports contralateral reference during endodontic
planning. Clinically, a standard periapical radiograph capturing both premolars offers a practical, low-radiation
alternative to CBCT for preliminary assessment, optimizing treatment efficacy while minimizing patient
radiation exposure.
P03
Prevalence of MB2 Canal in Maxillary Molars of Han Population
Wu JY ▲ Chiang HS Shieh YS Wu YC*
School of Dentistry & Department of Dentistry, National Defense Medical University and Tri-Service General Hospital
The second mesiobuccal canal (MB2) is one of the most common anatomical variations in maxillary
molars. Failure to identify and treat this canal during root canal treatment may result in persistent infection,
apical periodontitis, and unfavorable treatment outcomes. However, evidence regarding the prevalence of
MB2 in the Han population remains fragmented. The aim of this study was to evaluate the prevalence of MB2
in maxillary first and second molars of the Han population and to investigate the influence of sex and tooth
side through a systematic review and meta-analysis. Following the PRISMA guidelines, studies published
before August 17, 2025 were identified from PubMed, MEDLINE, Scopus, and ClinicalKey databases. Only
studies using cone-beam computed tomography (CBCT) to assess MB2 prevalence in permanent maxillary
molars of Han populations were included. A random-effects model was applied for meta-analysis. Fourteen
studies involving 15,639 subjects and 35,929 teeth were included. The pooled prevalence of MB2 was 63.7%
in maxillary first molars and 23.3% in maxillary second molars. Male subjects exhibited significantly higher
odds of having MB2 than females, with odds ratios of 1.532 and 1.790 for maxillary first and second molars,
respectively. No significant difference was observed between the left and right sides. Within the limitations
of this study, MB2 was highly prevalent in maxillary molars of the Han population, particularly in maxillary
first molars. Clinicians should carefully evaluate the presence of MB2 and consider the use of CBCT and
microscopic endodontic techniques to improve canal detection and treatment outcomes.
P04
Development and Evaluation of Automatic Access Opening Planning for Root Canal Treatment
Ho YC ▲1,2 Chen BH1,2 Chang SL3 Wu KC3 Chen CW*3
1Department of Stomatology, Taipei Veterans General Hospital, Taipei, Taiwan
2College of Dentistry, National Yang Ming Chiao Tung University, Taipei, Taiwan
3Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan
To reduce human burden and fatigue in repetitive operations, robot-assisted endodontics with automatic
pre-operative planning has recently emerged. This ex vivo study developed an automatic access opening
planning algorithm and evaluated its accuracy for root canal treatment. Thirty-one extracted single- and two-
canal human teeth (premolars and canines) were scanned using micro-computed tomography (CT). The
CT images were input into a particle-swarm-optimization-based algorithm to determine the optimal access
opening path. To minimize planning complexity for these specific tooth types, the cross-sectional shape of
the access opening was modeled as an ellipse. Three general dentists then reviewed the planning result, either
approving or modifying to meet clinical standards. The variation between the dentists (DD) and the variation
between the algorithm and dentists (AD) were compared using paired t-test and Wilcoxon signed-rank test to
verify the accuracy of the algorithm. By comparing DD and AD in linear, angular, 2D and 3D metrics, there
was no statistical difference between them or the difference was clinically negligible. The 3D spatial and 2D
cross-sectional overlap between the algorithm-planned and dentist-approved paths exceeded 80%. In this ex
vivo study, the algorithm demonstrated clinically acceptable accuracy as general dentists did. In the future, the
shape of the access opening can be set as an irregular shape to better match pulp chamber anatomy, increasing
the planning accuracy and therefore preserving more tooth structure.
P05
Impact of Submicron Diamond on Enterococcus faecalis Biofilm Formation and Viability
Septiani C ▲1 Huang HM1 Hsieh SC*1,2
1Department of Oral Medicine, School of Dentistry, Taipei Medical University, Taipei, Taiwan
2Department of Endodontology, Taipei Municipal Wan-Fang Hospital, Taipei, Taiwan
Persistent Enterococcus faecalis biofilm in root canals remains a major challenge in endodontic treatment.
Sodium hypochlorite (NaOCl) is the standard irrigant used in endodontic procedures, yet its efficacy remains
limited by delivery method and biofilm resistance. Our previous studies have demonstrated that 500 nm
submicron diamonds (SMD) supplemented in NaOCl with sonic and ultrasonic activation effectively remove
smear layer and hard-tissue debris, and show superior E. faecalis biofilm removal under SEM, CLSM, and
Micro-CT. This preliminary study evaluates SMD-supplemented NaOCl efficacy against E. faecalis biofilm
using quantitative formation and viability assays. Thirty extracted single-rooted premolars are being enrolled.
The canals were prepared with ProTaper® Gold F2 (Dentsply Sirona, USA), inoculated with E. faecalis (OD
= 0.1), and incubated for 21 days to establish biofilm. The teeth were divided into six groups (n=5) and
received different irrigation protocols: positive control, standard 3% NaOCl via manual irrigation, sonic
activation, and ultrasonic activation, and SMD-supplemented 3% NaOCl (500 nm, 10 mg/mL) via sonic and
ultrasonic activation. Biofilm was quantified with crystal violet staining for biofilm formation and resazurin-
based detection for biofilm viability. Preliminary results showed consistent reduction across all irrigated
groups. Both SMD+Sonic (formation: 0.081 ± 0.015; viability: 0.238 ± 0.092) and SMD+Ultrasonic
(formation: 0.040 ± 0.0001; viability: 0.042 ± 0.0008) groups showed significantly greater biofilm reduction
compared to all standard NaOCl groups (p < 0.05), with no significant difference between them. Our findings
demonstrated that SMD-supplemented NaOCl enhanced E. faecalis biofilm removal and decreased biofilm
viability regardless of activation method.
P06
Classification of Autotransplantation of Teeth and Clinical Outcome
Wen JH ▲ Tsai LY Wang HH Huang YW*
Taipei Medical University Wan Fang Hospital
Autotransplantation of teeth (ATT) is a reliable treatment option for replacing missing teeth. However,
the influence of recipient socket conditions on treatment outcomes remains unclear. This retrospective study
evaluated the effect of recipient socket conditions on the clinical outcomes of ATT. Fifty-five ATT cases were
reviewed, with a mean follow-up period of 31 months. Recipient sites were classified into four categories
according to the size relationship between the recipient socket and donor tooth: Class 1 (recipient socket larger
than the donor tooth), Class 2 (recipient socket similar in size to the donor tooth), Class 3 (recipient socket
smaller than the donor tooth), and Class 4 (edentulous ridge recipient site), with Class 0 representing donor
teeth affected by periodontitis. Clinical outcomes and cumulative survival rates were analyzed. The effects of
patient age, use of a 3D replica, open apex, splinting time, and extraction reason on treatment outcomes were
also evaluated. Survival rates were 100% for Class 1, 3, and 4 sockets, 94.4% for Class 2 sockets, and 75%
for Class 0 donor teeth. The use of a 3D analog significantly improved outcomes (p = 0.037), while procedural
discrepancies negatively affected results (p < 0.01). ATT demonstrated favorable clinical outcomes across
different recipient socket conditions. The proposed recipient socket classification may assist clinicians in
selecting appropriate surgical approaches and improving treatment predictability.
P07
Association between Bone-Modifying Agent Therapy and Periapical Healing Following Root Canal Treatment
Liu HC ▲1 Wang CH1 Wang YT2 Huang YW1 Wang HH*1
1Department of Dentistry, Wan-Fang Hospital, Taipei Medical University
2Department of Pharmacy, Wan-Fang Hospital, Taipei Medical University
Bone-modifying agents (BMAs) are widely used for the management of osteoporosis and cancer-related
bone diseases and may influence bone metabolism and healing. The aim of this study was to evaluate the
association between BMAs exposure and the healing of apical periodontitis following non-surgical root canal
treatment (NSRCT). Patients who received oral or injectable BMAs and underwent NSRCT at Wan Fang
Hospital between January 2022 and September 2025 were reviewed. Eligible cases had periapical radiographs
available for healing assessment using the periapical index (PAI). A total of 92 cases were included. Patients
with BMAs exposure exceeding one year demonstrated a significantly higher rate of PAI improvement than
those with less than one year of exposure (68.4% vs. 43.8%; OR = 2.79, 95% CI: 1.05–7.40; p = 0.040).
Within the limitations of this study, BMAs exposure for more than one year was associated with improved
radiographic healing following NSRCT. However, a causal relationship could not be established. Further
prospective studies with appropriate control groups and larger sample sizes are needed to confirm these
findings and clarify the independent effect of BMAs exposure on periapical healing.
P08
牙髓幹細胞來源外泌體與MTA對牙髓幹細胞之影響 Effects of Dental Pulp Stem Cell-Derived Exosomes and MTA on Human Dental Pulp Stem Cells
黃翠賢(Huang TH) ▲*1,2 王力朋(Wanitkitkurpol P)1 林奕廷(Lin YT)2 張家源(Chang JY)2 黃尚志(Huang ST)2 陳琬蓁 (Chen WC)1,2 洪啓智 (Hong CJ)1,2
1中山醫學大學口腔醫學院 2中山醫學大學附設醫院牙髓病科
三氧化礦物聚合體(mineral trioxide aggregate, MTA)因具良好生物相容性及促進硬組織修復能力,
廣泛應用於活髓治療及根管治療。近年來,牙髓幹細胞(dental pulp stem cells, DPSCs)來源之外泌體
(extracellular vesicles, EVs)因具有促進細胞增生及組織再生之潛力,逐漸成為牙髓再生研究的重要
方向。本研究評估DPSC來源EVs與MTA萃取液單獨或聯合應用對人類DPSCs細胞活性之影響。人類
DPSCs(第3–10代)培養於DMEM/MSCM混合培養液中。EVs經無血清培養、0.22 μm過濾及300 kDa切
向流過濾純化,並以ZetaView®分析粒徑與濃度。MTA依ISO 10993-12製備萃取液後稀釋為不同濃度。
DPSCs分別接受EVs、MTA萃取液或兩者聯合處理,於24、48及72小時以MTT assay評估細胞活性。結
果顯示,DPSC來源EVs於各濃度及各時間點均可維持或提升細胞活性,顯示其具有良好生物相容性及
促進增生能力。MTA萃取液呈濃度依賴性效應,低濃度可維持或促進細胞活性,高濃度則隨培養時間
延長產生抑制作用。與單獨使用MTA萃取液相比,EVs與MTA聯合處理於24、48及72小時皆可提高細
胞活性,顯示EVs可部分緩解高濃度MTA造成之抑制效應。綜合而言,DPSC來源EVs具有良好生物相
容性及促進DPSCs增生之能力,與MTA聯合應用可改善MTA對細胞活性之抑制作用,顯示其於牙髓再
生治療具有潛在應用價值,未來仍需進一步探討其促進牙髓修復及礦化分化之機轉。
P09
下顎第二小臼齒 C 型根管之處置:病例報告 Management of a C-Shaped Root Canal in a Mandibular Second Premolar: A Case Report
江依芸(Chiang IY) ▲ 蘇映輝(Su YH) 莊富雄(Chuang FH)*
高雄醫學大學附設醫院牙科部牙髓病暨牙體復形科
根據一項透過橫截面分析法,探討華人族群下顎第一小臼齒的根管形態的研究。約五成左右的
牙齒具備單一根管,其餘則包含雙根管(22%)、C形根管(18%)、環狀根管(6%);且這類變異多出現在
根尖3至6毫米的區域。下顎第二小臼齒根管形態相對單純,約9成是單一根管、單一根尖孔;C形根
管更是少之又少。然而靠近根尖處的根管變異,與治療預後息息相關。如何在達成良好的修形與清潔
前提之下,盡可能保留最多齒質,對保留自然牙有極大幫助。此20歲男性因右下第二小臼齒齲齒造成
的牙髓壞死而接受根管治療,患者初診時已無明顯臨床症狀。經髓腔開闊與清創以及根尖放射影像,
確定為C形根管小臼齒。在顯微鏡下確認峽部位置與頰側及舌側根管開口後,以超音波探頭搭配次氯
酸鈉沖洗完成冠部向根尖擴大技術(crown-down preparation)。隨後以鎳鈦旋轉銼針搭配次氯酸鈉沖洗
完成頰側、舌側根管及峽部的清創與修型。隨後以垂直熱加壓充填法搭配AH Plus 根管封填劑封填根
管。一週回診追蹤患者沒有臨床症狀,建議患者製作臨時牙冠持續追蹤觀察。相對於下顎第二大臼
齒,下顎小臼齒C形根管在臨床比較少見,操作空間較小,發生平台(ledge)或穿孔的機率也較高。此
案例以顯微鏡搭配超音波探頭,盡可能保留更多齒質,也完成根管的清潔與修形。
P10
Endodontic Management of S-Shaped Root Canals: A Case Series
Hsiao HY ▲1 Hung WC1,2 Lin HY1 Wang CC1 Yang CY1 Wang SH1 Chang CW*1,3
1Devision of Endodontic, Dental Department, Taipei Medical University Hospital
2School of Oral Hygiene, College of Oral Medicine, Taipei Medical University
3School of Dentistry, College of Oral Medicine, Taipei Medical University
Curved root canals increase the risk of procedural complications during endodontic treatment, including
canal transportation, perforation, and instrument separation. S-Shaped root canals, characterized by double
curvatures, present a particularly challenging anatomical configuration because maintaining the original canal
pathway during instrumentation can be difficult. Appropriate treatment planning and instrument selection are
therefore essential for successful management. This report presents three cases of S-Shaped root canals, including
two maxillary second premolars and one mandibular second premolar. Preoperative radiographic examination
revealed double curvatures in all teeth. Canal negotiation and glide path establishment were performed using
pre-curved stainless steel hand files, followed by canal shaping with nickel–titanium instruments. Root
canal obturation was completed using the hydraulic filling technique. Management of S-Shaped root canals
requires careful assessment of both coronal and apical curvatures during treatment planning. Establishment
of a reproducible glide path before rotary instrumentation is critical, as abrupt changes in canal direction
increase the risk of canal transportation, ledge formation, perforation, and instrument separation. Instrument
selection, flexibility, and shaping sequence should be considered to minimize unnecessary dentin removal while
maintaining the original canal anatomy. Recognition of these anatomical challenges is essential for reducing
iatrogenic complications and improving treatment predictability.
P11
下顎第一大臼齒遠心單牙根具三根管之非手術性根管治療: 案例報告 Nonsurgical Endodontic Treatment of Mandibular First Molars with Three Root Canals in Single Distal Root: A Case Report
陳遠揚(Chen YY) ▲1 張仁豪(Chang JH)1 賴聖曜(Lai SY)1 王偉全(Wang WQ)1 涂 明君(Tu MG)*1,2
1中國醫藥大學附設醫院牙醫部 2中國醫藥大學牙醫學系
成功根管治療的關鍵在於徹底清創與緻密充填整個根管系統。下顎第一大臼齒常具三根管或四
根管。遠心牙根出現三個根管的解剖變異極為罕見,若在術前或術中忽略,常導致治療失敗。本報告
呈現一例下顎第一大臼齒遠心三根管病例,並探討其臨床診斷與治療策略。病例:一位男性患者因右
側下顎第一大臼齒自發性疼痛到本院進行評估治療,臨床與放射線檢查診斷為牙髓為不可逆性牙髓炎
(irreversible pulpitis),根尖診斷為症狀型根尖周圍炎(symptomatic apical periodontitis)。於本院進行髓腔
開擴後,確認到近心頰側、近心舌側、遠心頰側、遠心舌側共計四根管。在治療過程均採用鎳鈦旋轉
器械搭配手動器械進行擴大清創並且搭配超音波沖洗。進行幾次的治療後患者表示仍然有症狀,因此
懷疑有遺漏的根管。使用超音波器械在近心及遠心狹部(isthmus)移除周圍齒質進行探測後,最終懷疑
有遠心中央根管(middle-distal canal),因此拍攝錐狀束電腦斷層掃描(cone beam computed tomography,
CBCT)進行確認。完成遠心中央根管之清創後,患者症狀改善。最終使用垂直加熱填壓法完成根管
充填。結論 : 針對此類罕見複雜根管系統,臨床上須仰賴牙科手術顯微鏡 (dental operating microscope,
DOM) 探測根管開口。同時可使用超音波器械或者長柄慢速車針(long neck low speed bur) 沿著狹部進
行挖溝(troughing)移除部分牙本質以便暴露出額外的根管開口。錐狀束電腦斷層掃描被認為是進行治
療前確認根管位置的黃金標準。
P12
上顎第一大臼齒嚴重彎曲根管之重新治療:病例報告 Endodontic Retreatment of Severely Curved Root Canals in a Maxillary First Molar: A Case Report
藍欣(Lan H) ▲*1 陳錦松(Chen CS)1,2 江宜蓁(Chiang YC)1 劉昀庭(Liu YT)1
1汐止國泰綜合醫院牙髓病科 2國泰綜合醫院牙髓病科
上顎第一大臼齒常具有複雜且變異性高的根管解剖形態,其中近心頰側根管常見明顯的彎曲,且
伴隨第二近心頰側根管的存在,使得初始根管治療難度大幅提升。當出現遺漏根管、根管清創不足或
因根管嚴重彎曲導致平台(ledge)、偏移(transportation)出現時,可能造成持續性的髓腔內感染,進而需
要根管重新治療。彎曲根管的重新治療極具挑戰性,本案例藉由牙科顯微鏡、超音波器械及旋轉鎳鈦
器械的輔助,安全移除舊有充填物,在盡量不偏移原有彎曲根管的路徑下,徹底清創並緻密封填。患
者後續完成贋復物製作,術後追蹤無不適,臨床檢查皆正常。
P13
Endodontic Management of Mandibular Second Molar Fused with a Paramolar Tubercle: A Case Report
Lai JY ▲1 Hung WC*1,2 Chang CW1,3 Lin HY1 Wang CC1 Yang CY1 Wang SH1
1Division of Endodontic, Dental Department, Taipei medical University Hospital
2School of Oral Hygiene, College of Oral Medicine, Taipei Medical University
3School of Dentistry, College of Oral Medicine, Taipei Medical University
Successful non-surgical root canal treatment relies on effective elimination of infection from the root
canal system. However, anatomical variations of teeth can present significant challenges during treatment.
These variations may occur in the crown, root, or both, such as tooth fusion or accessory cusps, leading to
complex root canal morphology. Therefore, careful evaluation of dental anatomy before treatment is essential.
This case report presents the endodontic management of a rare mandibular second molar fused with a
paramolar tubercle.
P14
類似穿孔解剖變異之上顎第一大臼齒非手術性根管治療: 病例報告 Anatomical Variations Mimicking Perforation in Nonsurgical Root Canal Treatment of Maxillary First Molars: Two Cases Report
林郁恆(Lin YH) ▲* 陳姿穎(Chen TY) 陳城章(Chen CC) 李欣頻(Li HP)
林口長庚紀念醫院
上顎大臼齒之X光根尖片影像,常因其牙根型態與周邊複雜解剖構造投影重疊,造成判讀困難。
本報告分析兩例上顎第一大臼齒進行非手術性根管治療之病例。第一例為初次根管治療(primary root
canal treatment),於測量工作長度(working length)時,根尖片顯示近心頰側(mesiobuccal, MB)根管看
似於髓室底穿孔,經使用顯微鏡(dental operating microscope, DOM)探查確認無穿孔。再以錐狀束電
腦斷層掃描(cone-beam computed tomography, CBCT)影像顯示其近心頰側根寬大,第二近心頰側根管
(MB2 canal)開口遠離近心頰側根管,位於 MB 與腭側(palatal, P)根管開口連線中點。第二例為先前治
療失敗病例,術前根尖片顯示根管充填物於牙根分岔處似有穿孔,顯微鏡下觀察發現腔室底沒有穿孔
情形,CBCT 影像證實該牙具備盛行率小於 1% 的獨立近心腭側根(mesiopalatal root)且被馬來膠(gutta
percha)及樹脂牙柱心(resin core)覆蓋。上顎第一大臼齒之 MB 根出現雙根管之盛行率高達 95%。上述
兩例牙齒之解剖構造因與主根管距離較遠,在二維影像上易呈現類似穿孔假象。若僅依賴根尖片,極
易誤診而導致錯誤的拔牙決策。臨床醫師除應熟悉解剖變異外,亦應結合顯微鏡與 CBCT 進行三維空
間評估,以提升診斷正確性。
P15
Endodontic Management of Maxillary Second Molar with MB3 Canal: A Case Report
▲ Huang YF Chuang FH*
Department of Dentistry, Kaohsiung Medical University Hospital
The root canal anatomy of the maxillary second molar exhibits high variability. Clinically, the
mesiobuccal (MB) root typically contains one or two canals; however, the occurrence of three independent
canals (MB1, MB2, and MB3) within a single root is extremely rare. This case report demonstrates the
application of cone-beam computed tomography (CBCT) to visualize the complex canal morphology.
Endodontic treatment was facilitated by a dental operating microscope and ultrasonic instruments, and
obturation was completed via warm vertical compaction. In conclusion, maintaining a high index of suspicion
regarding anatomical variations—combined with high-magnification illumination and advanced imaging—
can effectively minimize the risk of missed canals, thereby enhancing treatment quality and long-term success
rates.
P16
下顎第一大臼齒區之放射線不透性病灶 Radiopaque Lesion in the Posterior Mandible
陳冠宇(Chen KY) ▲1,2 李詔婷 (Lee ST)2 楊瓊宜 (Yang CI)2 宋宜駒 (Sung YC)2 楊正媺 (Yang CM)*2
1高雄榮民總醫院台南分院牙科 2高雄榮民總醫院牙髓病科
下顎後牙區根尖周圍放射線不透性病灶常需鑑別牙髓疾病相關之硬化性骨炎(condensing osteitis)與
非炎性病變,如牙骨質增生(hypercementosis)、牙骨質-骨質發育不良(cemento-osseous dysplasia)及牙骨
質母細胞瘤(cementoblastoma)。本病例報告以同一位40歲女性下顎左右後牙區兩處放射線不透性病灶
為例,探討如何藉由牙周韌帶界線及病灶與牙根之關係,快速判斷病灶源自牙根周圍發炎反應或牙骨
質 (cementum-origin),進而評估其與牙髓疾病之關聯性。病患2年前因左下後牙區放射線不透性病灶
診斷為牙骨質母細胞瘤而拔除左下第一大臼齒,術前牙髓活性測試為陽性,其放射影像呈現與牙根融
合並伴隨完整放射線透射性(radiolucent)暈環。此次因右下第一大臼齒持續脹痛由診所轉診至本院評
估。臨床檢查發現齲齒及敲診疼痛;放射影像顯示患牙已根管治療,遠心牙根尖周圍存在邊界清楚之
放射線不透性病灶,但牙周韌帶界線仍可辨識。綜合臨床與影像檢查,診斷右下第一大臼齒為已根管
治療之症狀型根尖周圍炎(previously treated & symptomatic apical periodontitis),合併牙骨質增生。經根
管再治療後三個月追蹤,症狀消失,根尖周圍放射線透過性區域變小,而放射線不透性病灶無明顯變
化。由此病例顯示,除牙髓活性外,牙周韌帶界線及病灶與牙根之關係可作為臨床快速鑑別骨性病變
與牙骨質來源病變的重要依據,有助於正確診斷並制定適當治療策略。
P17
根尖周圍炎與根尖礦化生物膜導致牙髓病源性上顎竇炎: 病例報告 Apical Periodontitis and Apical Mineralized Biofilm Leading to Maxillary Sinusitis Endodontic Origin: A Case Report
吳宗隆(Wu CL) ▲*1 張晁熙(Chang CH)2 李雲琪(Li YC)3 孟令成(Meng LC)4
1國泰醫療財團法人國泰綜合醫院口腔醫學部牙髓病科 2國泰醫療財團法人國泰綜合醫院口腔醫學部口腔顎
面外科 3國泰醫療財團法人國泰綜合醫院口腔醫學部家庭牙醫科 4台北醫學大學附設醫院口腔病理科
牙髓病源性上顎竇炎(maxillary sinusitis of endodontic origin, MSEO)是一種常被誤診的疾病。據研
究,在單側上顎竇炎患者中, 因齒源問題引起的比例高達 五至七成。在確診為齒源性的鼻竇炎中,
有高達七成是由牙根尖病變或根管治療不當等牙髓相關問題所引起。根管外感染與根尖礦化生物膜
(apical mineralized biofilm)可能是導致根管治療失敗與持續性根尖牙周炎的原因。當臨床上進行標準的
根管治療或重新治療後仍失敗時,就應當被考慮。本次報告病例為一47歲男性,因左上後牙區腫痛來
院就醫,自述上顎左側單側鼻竇炎反覆發生已半年多,左上後牙牙橋使用已超過10年。經理學及放射
線學影像檢查(包含CBCT),診斷為左上第二大臼齒先前根管治療,症狀性根尖周圍炎合併MSEO。建
議針對該患齒進行根管重新治療,並不排除手術(蓄意再植術)介入的可能。病人經該患齒根管再治療
後單側鼻竇炎症狀依然反反覆覆,改善不大。與病人溝通同意之後,偕同口腔顎面外科醫師進行該患
齒刻意再植術。由於患齒結構缺損較大,於拔除術中發生牙齒斷裂,故整顆拔除,並將根尖周圍病灶
完全挖除。但在其近心頰側牙根尖發現明顯根尖礦化生物膜。病人術後三個月回診,單側鼻竇炎症狀
已完全改善,轉診至本院假牙贗復科,完成後續治療。
P18
Maxillary Sinusitis of Endodontic Origin: A Case Report
▲ Chen YJ Ou TZ Wang HH*
Wanfang Hospital Taipei Medical University
Maxillary sinusitis of endodontic origin (MSEO) is a specialized condition where periapical pathology
triggers chronic sinonasal inflammation, accounting for up to 40% of unilateral maxillary sinusitis. We present
a 24-year-old female patient with a 6-month history of chronic sinusitis despite repeated ENT treatments.
The Cone-beam computed tomography (CBCT) demonstrated left-sided extensive mucosal opacification with
ostium obstruction, alongside a periapical radiolucency on the previously treated tooth 26 with maxillary sinus
floor perforation. After nonsurgical root canal retreatment under dental operating microscope and concurrent
ENT surgical intervention, complete periapical healing was achieved with sinus floor re-ossification at
the 1-year follow-up . Clinically, the patient reported no discomfort or symptoms. MSEO is frequently
underdiagnosed because sinonasal symptoms often overshadow dental complaints, leading to prolonged
and ineffective ENT treatments. CBCT is an effective modality for the detection and diagnosis of MSEO.
Endodontic retreatment removed the primary infection source of MSEO and ENT surgical intervention is
sometimes required to help restore physiological sinus drainage. Interdisciplinary collaboration is essential
for the timely diagnosis and successful treatment of MSEO.
P19
Persistent Apical Abscess with Actinomycosis: A Case Report
Li CR ▲1 Chen YH1 Chen KL1 Kuo CY1 Liao IC1 Chen CA*2
1Department of Endodontics, Chi Mei Medical Center, Tainan, Taiwan
2Department of Endodontics, Chi Mei Hospital, Liouying, Tainan, Taiwan
Persistent apical infections following root canal treatment pose clinical challenges, often demanding
both non-surgical and surgical interventions. Actinomycosis, a rare bacterial infection, can further complicate
management, needs a total solution. We report a 27-year-old female presenting with an abscess on the
maxillary right lateral incisor 3 months post-root canal therapy, experiencing severe pain and swelling.
Examination revealed percussion and palpation tenderness, with a radiographic periapical radiolucency
of approximately 18 mm x 14 mm. The diagnosis remained previously initiated therapy and acute apical
abscess. The treatment plan integrated non-surgical retreatment and subsequent apical surgery.Emergency
treatment comprised incision and drainage and a 7-day amoxicillin course. Non-surgical endodontic treatment
was conducted under rubber dam isolation. Once asymptomatic, the canal was obturated utilizing the
lateral condensation technique. Five months later, persistent symptoms necessitated surgical intervention.
A full-thickness mucoperiosteal flap was raised for concurrent periapical curettage and root-end resection.
Retrograde cavity preparation utilized ultrasonic instruments, followed by a root-end filling. Bone grafting was
placed, and the flap sutured.Histopathological analysis confirmed endodontic sealer in the periapical region,
accompanied by distinct bacterial colonies composed of cocci. Identifying multiple colonies with sulfur
granule–like morphology established the diagnosis of actinomycosis. At the 36-month follow-up, the patient
remained asymptomatic, with the periapical lesion completely healed. This case underscores the complexity
of managing persistent apical abscesses with actinomycosis. A multidisciplinary approach integrating non-
surgical retreatment, surgical intervention, and vigilant follow-up proved essential.
P20
用蓄意再植術與Super-Bond修復下顎大臼齒垂直牙根斷裂: 五年追蹤病例報告 Intentional Replantation of a Vertically Root Fractured Mandibular Molar Repaired with Super-Bond: A Case Report with 5 Years Follow-up
方瑞仁(Fang JJ) ▲*1,2 王佩霜(Wang PS)1 吳政榮(Wu CJ)1 黃彥豪(Huang YH)1
1高雄長庚紀念醫院牙髓病科 2高雄市立鳳山醫院牙科(委託長庚醫療財團法人經營)
患者為48歲女性,主訴為右下第二大臼齒(tooth 47)一個月前開始出現咬合疼痛。六年前患齒因
齲齒而進行根管治療與假牙製作,最近一個月開始有咬合疼痛。患者沒有系統性疾病或是藥物過敏
史,夜間有磨牙的習慣。臨床檢查發現患齒有中度敲診與咬合疼痛,沒有觸診痛,牙齒動搖度在正
常範圍內,牙周囊袋深度在近心頰側為5 mm,其餘位置正常。X光檢查發現tooth 47近心側出現骨缺
損,臨床診斷tooth 47為已根管治療牙齒與症狀型根尖周圍炎(previously treated and symptomatic apical
periodontitis)並且懷疑近心側垂直牙根斷裂。與患者討論治療計畫並告知再植術與牙根斷裂治療效果
的侷限性,患者了解風險後同意先進行患齒再植術治療。手術中發現牙根近心側有垂直牙根斷裂,範
圍由牙根齒頸部延伸到根尖。使用Super-Bond 黏合劑修復垂直牙根斷裂。術後一週移除Coa-Pak與縫
線,傷口癒合良好。術後一個月,裝置臨時假牙。術後八個月,症狀改善後,裝置金屬牙冠。術後一
到三年每年回診檢查,有些許牙周組織發炎,安排定期牙周病維護。術後五年追蹤,tooth 47可以正
常咀嚼,沒有敲診與觸診疼痛,牙周囊袋與牙齒動搖度在正常範圍內。X光檢查可見近心端牙周韌帶
比較寬。整體治療後的結果為具有功能,維持咀嚼功能的狀況下,沒有明顯感染或是發炎的產生。
P21
使用蓄意牙齒再植術治療醫源性牙根穿孔吸收:病例報告 Management of Iatrogenic Perforating Root Resorption with Intentional Replantation: A Case Report
陳錦(Chen G) ▲*1,2 葉培錚(Yeh PC)1
1臺中榮民總醫院口腔醫學部牙髓病科 2京典美學牙醫診所
牙齒與牙根構造被吸收的原因有生理性,病理性與醫源性等因素。根據Andreasen對牙根吸收的
分類可區分為內吸收與外吸收兩大類。因此,正確診斷與處理可預防後續嚴重破壞。25歲黃姓患者於
2024年11月因牙齦腫脹及疼痛至本院檢診。臨床檢查上顎右側門齒有暫時性牙冠,輕度頰側牙齦發炎
併有觸痛。放射線檢查發現有牙根尖周圍病灶。2024年12月在局部麻醉協助下接受非手術性根管再治
療,橡皮障防濕布隔離後移除封填材料發現有纖維牙根釘柱堵塞。0.2%氯己丁沖洗根管後置放氫氧化
鈣。錐狀射束電腦斷層掃描確認穿孔位於近心頰側處。考慮家屬希望保留牙齒。2025年3月進行牙齒
再植治療,牙齒移出牙齒窩洞後牙根尖以三氧礦化物逆根尖充填,牙根穿孔以四環黴素處理後用生物
陶瓷材料修補,最後置回窩洞以縫線固定。一星期後拆除縫線傷口癒合良好。一、三、六個月後回診
病灶消失,牙根尖及吸收處骨質癒合良好。蓄意牙齒再植是有計畫將受損牙齒移出進行牙根尖手術或
牙根修復。臺中榮總2020年的研究報告指出蓄意牙齒再植1至3年存活率93.1%、87.7%及85.7%。本病
例報告為根管治療失誤導致牙根穿孔及吸收,以蓄意牙齒再植成功完成治療。
P22
蓄意再植術中應用 DMEM儲存液結合術後藥物輔助策略之探 討:病例報告 Application of DMEM Storage Combined with Postoperative Pharmacological Adjuncts in Intentional Replantation: A Case Report
黃宏秉(Huang HP) ▲1,2 林思洸(Lin SK)*1 李苑玲(Lee YL)1 周佳璇(Chou CH)2
1國立台灣大學醫學院附設醫院口腔醫學部牙髓病科
2國立台灣大學醫學院附設醫院雲林分院牙科部
蓄意再植術(intentional replantation)是針對傳統根管治療或非手術性根管再治療後仍有持續性
病灶,且不適合接受根尖手術之患齒所採取的治療選項。其預後與牙齒離體期間牙周韌帶細胞
(periodontal ligmanet, PDL)活性的維持與牙根吸收的預防密切相關。近期研究關注儲存液與術後藥物
提高蓄意再植術成功率之潛力。本病例為一位 53歲女性,於本院接受下顎右側第二大臼齒非手術性根
管再治療後仍反覆出現頰側膿包,故選擇蓄意再植術。術中患齒拔除後立即置入含有 10% 胎牛血清
(fetal calf serum, FCS)的細胞培養液(Dulbecco’s modified eagle medium, DMEM)中保存。患齒離體期間
完成根尖切除與三氧礦化聚合物(mineral trioxide aggreagate, MTA)逆充填後復位固定,整體離體時間控
制於15 分鐘內。術後搭配短期類固醇、 Statin 類藥物及 Forflow以降低發炎反應並促進血液微循環。
術後追蹤顯示膿包消退、症狀改善,根尖影像可見病灶癒合趨勢。
P23
具牙根發育溝及副根管之C型根管下顎小臼齒之蓄意再植: 病例報告 Intentional Replantation of a C-Shaped Canal Mandibular Premolar with Radicular Groove and Accessory Canal: A Case Report
余承桓(Yu CH) ▲ 楊臻繹(Yang CY) 韓維美(Harn WM) 詹傑(Chan C)*
彰化基督教醫療財團法人彰化基督教醫院牙髓病科
下顎第一小臼齒C型根管案例較為罕見,根管系統複雜、徹底清創較為困難。C型根管在下顎第
一小臼齒中大約有2.3%的盛行率;甚至在一篇以臺灣人為對象的研究中,下顎第一小臼齒C型根管盛
行率達18%。另外,下顎小臼齒C型根管案例中,具有牙根發育溝(radicular groove)者有很高的比例具
有副根管(accessory canal)。本病例為具C形根管之右下顎第一小臼齒,因疼痛與竇管(sinus tract)由診
所轉診至本院;經非手術性根管治療後竇管持續未消,因此懷疑為副根管構造導致根管清創不完全,
後續安排翻瓣檢視骨缺損區域與蓄意再植。術中將牙齒拔出,以亞甲基藍(methylene blue)染色後在顯
微鏡下觀察;確認沒有裂痕,並且定位副根管開口位置後使用超音波器械清創並進行製備,後採用生
物陶瓷材料(Biodentine®, Septodont, Saint-Maur-des-Fossés, France)對副根管進行逆充填,最後將牙齒植
回合併引導組織再生術(guided tissue regeneration)修復頰側齒槽骨開裂(dehiscence)骨缺損,並施予齒間
固定。術後5個月回診時已無臨床症狀、根尖周圍病灶癒合。對於因根管型態較複雜的下顎小臼齒導
致清創不完全而症狀持續,若非手術治療無法改善症狀時,以蓄意再植搭配超音波器械清創及以生物
陶瓷材料逆充填可改善症狀並獲得良好預後。
P24
運用第三大臼齒進行自體齒移植:病例報告 Autotransplantation of the Malposition Third Molar: A Case Report
趙妍晴(Chao YC) ▲*1,2 洪瑋成(Hung WC)2,3 宋承恩(Sung CE)2,3 喻大有(Yu DY)2,4 蘇文崧(Su WS)1,2
1三軍總醫院牙科部牙體復形暨牙髓病科 2國防醫學大學口腔醫學院
3三軍總醫院牙科部牙周病科 4三軍總醫院牙科部家庭牙醫暨口腔診斷科
以埋伏齒或已萌發的牙齒從原本位置,移至被拔牙或藉由手術製備的位置,來取代嚴重缺損的
牙齒或重建缺牙的區域,稱為自體齒移植(autotransplantation)。移植齒(donor tooth)的結構、受植區
(recipient site)的狀況、根管治療的時機與品質良好之冠部復形,是治療成功的重要因素,本病例報告
藉由一臨床案例,回顧自體齒移植的適應症、存活率及操作細節。病例為48歲女性,因右下後牙脹痛
不適至本院求診,臨床檢查發現,右側下顎第一大臼齒(tooth 46)具次發性齲齒,有敲痛、觸痛及牙周
囊袋探測深度異常,X光檢查發現根尖周圍有放射線可透性破壞,經顯微鏡檢查後建議拔除患齒。後
續藉由錐狀射束電腦斷層掃描(cone-beam computed tomography, CBCT)評估,與患者討論使用向頰側
旋轉、無咬合功能之左上第三大臼齒(tooth 28)進行自體齒移植,取代嚴重缺損的右側下顎第一大臼
齒。手術前,使用電腦斷層影像與3D列印技術,模擬印製移植齒,於術中協助修整受植區之齒槽窩,
後續進行移植齒之即時移植。手術後,於兩週內安排移植齒顯微根管治療,並完成牙冠復形。治療後
一年回診追蹤,移植齒無明顯動搖度或不適,X光檢查根尖周圍齒槽骨有再生跡象、牙根周圍無明顯
之吸收。
P25
Management of an Ankylosed Avulsed Immature Incisor: From Apexification to Decoronation
▲ Lin TC Huang HY Tso KY Chiu WC*
School of Dentistry & Department of Dentistry, National Cheng Kung University and National Cheng Kung
University Hospital
Traumatic avulsion of immature permanent teeth may result in pulp necrosis, root resorption, ankylosis,
and subsequent infraocclusion. Management is particularly challenging in growing patients because
progressive infraocclusion may compromise alveolar development and future prosthetic rehabilitation. An
11-year-old boy presented after avulsion of the immature maxillary left central incisor. Following replantation,
pulp necrosis with symptomatic apical periodontitis and inflammatory root resorption were diagnosed.
Because of the wide-open apex, apexification was performed using a mineral trioxide aggregate apical plug.
Periapical healing was achieved; however, replacement resorption and ankylosis became evident during
follow-up. The patient and his parents were informed that decoronation might be required if progressive
infraocclusion developed, and six-monthly monitoring was arranged. At age 14, during the pubertal growth
spurt, infraocclusion exceeded one-quarter of the clinical crown height and mesial tipping of adjacent teeth
was observed. Decoronation was therefore performed to preserve the alveolar ridge, and the clinical crown
was adapted as a natural tooth pontic. At 2.5 years after decoronation, healthy soft tissue contours, preservation
of alveolar ridge dimensions, and continued replacement of the retained root by bone were observed. This case
highlights the importance of long-term monitoring after replantation of immature teeth and demonstrates the
role of decoronation in preserving alveolar ridge dimensions in growing patients.
P26
Management of Severe Post-Traumatic External Inflammatory Root Resorption in an Immature Permanent Incisor
▲ Huang PH Chen YL Lee YL*
School of Dentistry & Department of Dentistry, National Taiwan University and National Taiwan University Hospital
Managing immature permanent teeth with severe traumatic dental injury-induced external inflammatory
root resorption (EIRR) is highly challenging. This case report describes a 9-year-old boy who underwent
reposition of an avulsed tooth 11 and repositioning of an intrused tooth 21, stablized with flexible splinting
within 1 hour post-injuy. Both teeth had open apices and showed negative responses to pulp vitality tests at
the 2-week splint removal. The patient defaulted on follow-ups, returning two months later with severe EIRR
of tooth 11 and distinct percussion and palpation pain. Pulp necrosis in both teeth was confirmed via the
test cavity. Root canal therapy was initiated, achieving disinfection through passive ultrasonic irrigation and
calcium hydroxide dressing. For tooth 11, additional intracanal corticosteroid medication was applied to arrest
resorption and alleviate symptoms. Given the severe root resorption, short root length, and thin dentinal walls,
tooth 11 was treated with regenerative endodontic procedure (REP). Tooth 21, presenting a more favorable
root morphology, underwent mineral trioxide aggregate (MTA) apexification. At the 48-month follow-up,
both teeth remained functional, showing periapical healing and arrest of root resorption. This case highlights
the importance of comprehensive post-trauma follow-up, early infection control, and appropriate treatment
selection for immature traumatized teeth.
P27
活髓治療之病例報告 Vital Pulp Therapy: A Case Report
陳佩欣(Chen PH) ▲ 戴岑芳(Tai TF)* 黎永康(Lai WH)
台南市立醫院牙科
近年來隨著活髓治療觀念、顯微鏡技術及生物陶瓷材料如 Biodentine 的發展,其成功率已接近傳
統非手術性根管治療。對於未成熟恆牙,保留活髓有助於牙根持續發育及根尖閉合。本病例為一名
12歲女性,於民國111年8月由診所轉診至本院。臨床及放射線檢查顯示,左上第二小臼齒(tooth 25)及
左上第一大臼齒(tooth 26)皆有深層齲齒,診斷為不可逆性牙髓炎及症狀性根尖周圍炎,其中tooth 25
牙根尚未閉合,tooth 26牙根已發育完成。考量患者年齡及tooth 25未成熟牙之特性,經討論後決定於
顯微鏡輔助下進行活髓治療。移除發炎牙髓組織,並使用浸泡2.5%次氯酸鈉溶液的無菌棉球,於5分
鐘內加壓止血後,以Biodentine 覆蓋,並以玻璃離子體及複合樹脂修復;tooth 26後續以不鏽鋼牙冠進
行全覆蓋修復。術後追蹤2年,兩顆牙齒皆無臨床症狀及放射線異常。然而術後2年餘,tooth 26逐漸
出現根尖病灶,已建議接受非手術性根管治療;tooth 25則於術後3年追蹤時可見牙根持續發育且根尖
孔完全閉合,無臨床及放射線病兆。本病例顯示,顯微鏡輔助活髓治療可作為不可逆性牙髓炎未成熟
恆牙之治療選項,並促進牙根持續發育與根尖閉合。然而即使短期結果良好,成熟恆牙仍可能於長期
追蹤中出現根尖病變,顯示定期追蹤的重要性。
P28
斷髓治療應用於發育完全之上顎第一大臼齒:病例報告 Pulpotomy in a Young Permanent Upper First Molar: A Case Report
劉昀庭(Liu YT) ▲*1 藍欣(Lan H)1 陳錦松(Chen CS)1,2
1汐止國泰綜合醫院牙科 2國泰綜合醫院牙科
本病例為一位九歲女孩,因左上第一大臼齒嚴重齲齒,由診所轉診至本院牙髓病科就診。口內及
放射學檢查可見左上第一大臼齒咬合面有嚴重齲齒接近牙髓腔,牙根發育接近完成,牙髓活性測試及
冷測試皆為正常。為了盡量保存患者後牙咬合功能及剩餘齒質強度,建議在顯微鏡的輔助下完整移除
齲齒,視牙髓感染程度及狀況評估牙髓治療計劃,首先考慮活髓治療、保留牙髓組織及生理機能,使
根管壁能夠持續增厚及減低傳統根管治療可能引起的併發症。在局部麻醉使用下、橡皮障隔離後於顯
微鏡下仔細移除齲齒,過程中牙髓暴露但仍有未完全移除的齲齒。將齲齒完全移除後並將牙髓腔內感
染出血的牙髓組織移除,並使用生理食鹽水大量沖洗,可見根管內仍存在健康的牙髓組織,於是使用
3%次氯酸鈉溶液沖洗及配合微濕小棉球加壓止血、生物陶瓷(biodentine)覆蓋後,利用光固化玻璃離子
體(Ionoseal)及複合樹脂進行冠部密封,完成斷髓治療(pulpotomy)。左上第一大臼齒進行斷髓治療後,
持續追蹤沒有臨床症狀,且冷測試(cold test)仍有反應,放射學檢查可見牙根管壁厚度有些微增加且根
尖組織正常。21個月後追蹤,左上第一大臼齒根尖組織正常、雙側小臼齒皆已萌發,咬合功能漸趨完
整。本報告探討斷髓治療於年輕恆牙的應用、使用材料及臨床考量。
P29
牙髓牙周聯合病灶之預後評估與治療管理: 文獻回顧與病例報告 Prognostic Assessment and Management of Endodontic/Periodontic Lesion: A Literature Review and Case Report
李昀庭(Lee YT) ▲1 洪維彊(Hung WC)1,2 張俊偉(Chang CW)1,3 林芯宇(Lin HY)1 王正潔(Wang CC)*1 楊千瑩(Yang CY)1 王秀慧(Wang SH)1
1臺北醫學大學附設醫院 口腔醫學部牙髓病科 2臺北醫學大學 口腔醫學院 口腔衛生學系
3臺北醫學大學 口腔醫學院 牙醫學系
牙髓牙周聯合病灶(endodontic/periodontic lesion)在臨床上面臨極大的決策挑戰。由於牙髓牙周聯
合病灶病因交織且過往缺乏客觀、可量化的評估指標,臨床上常因預後預測的不確定性,導致醫師難
以向患者精確解釋嚴重程度,這往往造成醫病溝通與決策的困難。為打破此臨床困境,本篇藉由探討
目前文獻所提出之客觀預後指標,期望在治療前精確掌握患齒預後,並作為醫病溝通的科學化指引。
文獻指出,牙髓牙周聯合病灶的 5 年存活率可達 85% 以上,然而其預後不應一概而論,而是應取決
於明確的量化因子,包括:骨吸收是否延伸至根尖三分之一、牙周囊袋深度是否大於5毫米、患者是
否抽菸及有無牙周病史。在診斷與預後評估上,錐狀射束電腦斷層掃描(CBCT)扮演關鍵輔助角色,其
三維影像能更清晰地呈現骨破壞型態並輔助偵測多數牙根缺損(如穿孔或吸收),將診斷準確率從傳統
根尖片的 42.2% 提升至 67.2%。引入客觀預後指標並合理運用錐狀射束電腦斷層掃描,能提供更科學
化的決策工具,進而優化醫病溝通並提升患齒的保留率。本篇透過牙髓牙周聯合病灶臨床病例,展示
如何結合上述指標與錐狀射束電腦斷層掃描進行客觀預後評估。