Kuan-Wei Tung, Hajime Sasaki, Bruno Cavalcanti, Richard Gardner, Neville McDonald
{"title":"解剖参数对c形管中电子顶点定位器精度的影响:一种新型微ct分析方法。","authors":"Kuan-Wei Tung, Hajime Sasaki, Bruno Cavalcanti, Richard Gardner, Neville McDonald","doi":"10.1016/j.joen.2025.09.012","DOIUrl":null,"url":null,"abstract":"<p><strong>Purpose: </strong>This study aimed to evaluate the influence of anatomical parameters on the accuracy of two electronic apex locators (Raypex 6 and Root ZX II) in C-shaped canal mandibular molars using a novel Microcomputed tomography (Micro-CT) analysis incorporating Feret diameter.</p><p><strong>Method: </strong>The actual root canal length (RCL) was measured using the visual method. The electronic canal length (ECL), which determined the apical foramen (AF), and the electronic working length (EWL), which determined the apical constriction (AC), were obtained using Raypex 6 and Root ZX II. The root working length (RWL), calculated by subtracting the AC-AF distance from the RCL, served as a reference to evaluate the accuracy of the EWL. Anatomical parameters were derived from Micro-CT scans and included Feret diameters of AC and AF, AC-AF distance, presence/absence of accessory canal, C-shaped type, AF position and AC morphology. Statistical analysis involved Fisher's exact test and multinomial logistic regression.</p><p><strong>Results: </strong>The study included 42 C-shaped molar teeth and 119 canals. Raypex 6 and Root ZX II determined AF within ±0.5 mm in 97.5% and 96.4% of canals, respectively. A statistically significant difference was found in accuracy between detecting AF and AC (P <0.05). After multinomial logistic regression, multiple AC morphology was the only factor negatively affecting AC accuracy in both EALs.</p><p><strong>Conclusion: </strong>Raypex 6 and Root ZX II accurately detected AF but were less reliable for AC in C-shaped canal mandibular molars. Reduced AC accuracy was associated with multiple AC morphology, indicating that EALs may detect the first narrow part of the canal apically rather than the narrowest part.</p>","PeriodicalId":15703,"journal":{"name":"Journal of endodontics","volume":" ","pages":""},"PeriodicalIF":3.6000,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence of Anatomical Parameters on the Accuracy of Electronic Apex Locators in CShaped Canals: A Novel Micro-CT Analysis Incorporating Feret Diameter.\",\"authors\":\"Kuan-Wei Tung, Hajime Sasaki, Bruno Cavalcanti, Richard Gardner, Neville McDonald\",\"doi\":\"10.1016/j.joen.2025.09.012\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><strong>Purpose: </strong>This study aimed to evaluate the influence of anatomical parameters on the accuracy of two electronic apex locators (Raypex 6 and Root ZX II) in C-shaped canal mandibular molars using a novel Microcomputed tomography (Micro-CT) analysis incorporating Feret diameter.</p><p><strong>Method: </strong>The actual root canal length (RCL) was measured using the visual method. The electronic canal length (ECL), which determined the apical foramen (AF), and the electronic working length (EWL), which determined the apical constriction (AC), were obtained using Raypex 6 and Root ZX II. The root working length (RWL), calculated by subtracting the AC-AF distance from the RCL, served as a reference to evaluate the accuracy of the EWL. Anatomical parameters were derived from Micro-CT scans and included Feret diameters of AC and AF, AC-AF distance, presence/absence of accessory canal, C-shaped type, AF position and AC morphology. Statistical analysis involved Fisher's exact test and multinomial logistic regression.</p><p><strong>Results: </strong>The study included 42 C-shaped molar teeth and 119 canals. Raypex 6 and Root ZX II determined AF within ±0.5 mm in 97.5% and 96.4% of canals, respectively. A statistically significant difference was found in accuracy between detecting AF and AC (P <0.05). After multinomial logistic regression, multiple AC morphology was the only factor negatively affecting AC accuracy in both EALs.</p><p><strong>Conclusion: </strong>Raypex 6 and Root ZX II accurately detected AF but were less reliable for AC in C-shaped canal mandibular molars. Reduced AC accuracy was associated with multiple AC morphology, indicating that EALs may detect the first narrow part of the canal apically rather than the narrowest part.</p>\",\"PeriodicalId\":15703,\"journal\":{\"name\":\"Journal of endodontics\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":3.6000,\"publicationDate\":\"2025-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of endodontics\",\"FirstCategoryId\":\"3\",\"ListUrlMain\":\"https://doi.org/10.1016/j.joen.2025.09.012\",\"RegionNum\":2,\"RegionCategory\":\"医学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"DENTISTRY, ORAL SURGERY & MEDICINE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of endodontics","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.1016/j.joen.2025.09.012","RegionNum":2,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}
Influence of Anatomical Parameters on the Accuracy of Electronic Apex Locators in CShaped Canals: A Novel Micro-CT Analysis Incorporating Feret Diameter.
Purpose: This study aimed to evaluate the influence of anatomical parameters on the accuracy of two electronic apex locators (Raypex 6 and Root ZX II) in C-shaped canal mandibular molars using a novel Microcomputed tomography (Micro-CT) analysis incorporating Feret diameter.
Method: The actual root canal length (RCL) was measured using the visual method. The electronic canal length (ECL), which determined the apical foramen (AF), and the electronic working length (EWL), which determined the apical constriction (AC), were obtained using Raypex 6 and Root ZX II. The root working length (RWL), calculated by subtracting the AC-AF distance from the RCL, served as a reference to evaluate the accuracy of the EWL. Anatomical parameters were derived from Micro-CT scans and included Feret diameters of AC and AF, AC-AF distance, presence/absence of accessory canal, C-shaped type, AF position and AC morphology. Statistical analysis involved Fisher's exact test and multinomial logistic regression.
Results: The study included 42 C-shaped molar teeth and 119 canals. Raypex 6 and Root ZX II determined AF within ±0.5 mm in 97.5% and 96.4% of canals, respectively. A statistically significant difference was found in accuracy between detecting AF and AC (P <0.05). After multinomial logistic regression, multiple AC morphology was the only factor negatively affecting AC accuracy in both EALs.
Conclusion: Raypex 6 and Root ZX II accurately detected AF but were less reliable for AC in C-shaped canal mandibular molars. Reduced AC accuracy was associated with multiple AC morphology, indicating that EALs may detect the first narrow part of the canal apically rather than the narrowest part.
期刊介绍:
The Journal of Endodontics, the official journal of the American Association of Endodontists, publishes scientific articles, case reports and comparison studies evaluating materials and methods of pulp conservation and endodontic treatment. Endodontists and general dentists can learn about new concepts in root canal treatment and the latest advances in techniques and instrumentation in the one journal that helps them keep pace with rapid changes in this field.