Evidence map›Paper›PMID 42688546›Full record

ArticleJournal of dental sciences2026

Complex root canals of maxillary second premolars are associated with the occurrence of multiple roots in maxillary first premolars: A cone-beam computed tomographic study in a Taiwanese population.

Yi-Jie Chen, Zi-Jun Dai, Hsin-Jui Liou, Tien-Hung Hsieh, Yi-Chen Chung, Che-Yuan Lin, Ying-Wu Chen, Ren-Yeong Huang, Yi-Shing Shieh, Yu-Chiao Wu

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Article in Journal of dental sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

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3 · Its place in the literature

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4 · The record

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5 · Who and what money

Authors and funding

10 authors.

Yi-Jie ChenDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Zi-Jun DaiDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Hsin-Jui LiouDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Tien-Hung HsiehDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Yi-Chen ChungDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Che-Yuan LinDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Ying-Wu ChenDepartment of Periodontology, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Ren-Yeong HuangDepartment of Periodontology, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Yi-Shing ShiehDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.
Yu-Chiao WuDepartment of Operative Dentistry and Endodontics, College of Oral Medicine, Tri-Service General Hospital and National Defense Medical University, Taipei, Taiwan.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Background/purpose: Detecting two roots is generally easier than identifying complex canals within a single root using periapical films. We aimed to assess relationship between root number of permanent maxillary first premolars (PMFPs) and canal complexity in adjacent permanent maxillary second premolars (PMSPs) in a Taiwanese population using cone-beam computed tomography (CBCT). Materials and methods: A CBCT analysis was performed on 600 teeth (300 PMFPs and 300 PMSPs) from 150 patients. Canal morphology of PMSPs was classified according to Vertucci, bilateral symmetry was assessed, and multivariable logistic regression was applied to evaluate the association between PMFP root number and PMSP canal configuration, adjusting for sex, age, and side. Results: Of PMFPs, 56 % had a single root and 44 % had multiple roots. PMSPs showed predominantly one root (96 %) and displayed mainly Type I canals (53.3 %), followed by Type III (16.7 %) and Type II (12.3 %). Complex canals were observed in 46.7 %. Males were more likely to present with multi-rooted PMFPs and complex PMSP canals ( Conclusion: Multi-rooted PMFPs predict greater canal complexity in PMSPs. Periapical radiographs that include both premolars may provide a practical preliminary tool before CBCT, enhancing diagnostic accuracy while reducing radiation exposure.

Indexed as

CBCTComplex canalsMaxillary first premolarMaxillary second premolarMultiple roots

Identifiers

PMID42688546
PMCPMC13535954

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.