Qiyuan Zhang1, Hao Chen1, Bing Fan2, Wei Fan1, James L Gutmann3. 1. The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China. 2. The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) and Key Laboratory of Oral Biomedicine Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, China. Electronic address: bingfan8@hotmail.com. 3. Department of Endodontics, Baylor College of Dentistry, Texas A&M University System Health Science Center, Dallas, Texas.
Abstract
INTRODUCTION: Root fusion is an anatomic variation in maxillary second molars (MSMs); however, the nature of this canal morphology as it relates to its root anatomy has not been fully clarified. The purpose of this study was to investigate the relationship between features of fused roots and root canal anatomy in MSMs using micro-computed tomographic imaging. METHODS: One hundred eighty-seven extracted MSMs were scanned with the μCT50 (Scanco Medical, Bassersdorf, Switzerland), and their root and canal morphology was classified and analyzed using the classifications proposed by Yang and Vertucci. The number and position of canals that merged were recorded and compared among different root fusion types. RESULTS: One hundred eight (57.75%) MSMs had 3 separate roots, and 79 (42.25%) had fused roots. Of the 79 fused roots, 22 showed partial canal merging, and 6 had complete canal merging. Canal merging was found with teeth with 3-root fusion more often than in those with 2-root fusion (P < .05). Of 28 merged canals, 16 occurred between mesiobuccal and distobuccal canals and 9 among mesiobuccal, distobuccal, and palatal canals. CONCLUSIONS: MSMs with fused roots may present a complicated root canal system as a result of canal merging.
INTRODUCTION: Root fusion is an anatomic variation in maxillary second molars (MSMs); however, the nature of this canal morphology as it relates to its root anatomy has not been fully clarified. The purpose of this study was to investigate the relationship between features of fused roots and root canal anatomy in MSMs using micro-computed tomographic imaging. METHODS: One hundred eighty-seven extracted MSMs were scanned with the μCT50 (Scanco Medical, Bassersdorf, Switzerland), and their root and canal morphology was classified and analyzed using the classifications proposed by Yang and Vertucci. The number and position of canals that merged were recorded and compared among different root fusion types. RESULTS: One hundred eight (57.75%) MSMs had 3 separate roots, and 79 (42.25%) had fused roots. Of the 79 fused roots, 22 showed partial canal merging, and 6 had complete canal merging. Canal merging was found with teeth with 3-root fusion more often than in those with 2-root fusion (P < .05). Of 28 merged canals, 16 occurred between mesiobuccal and distobuccal canals and 9 among mesiobuccal, distobuccal, and palatal canals. CONCLUSIONS: MSMs with fused roots may present a complicated root canal system as a result of canal merging.
Authors: Ronald Ordinola-Zapata; Jorge N R Martins; Hugo Plascencia; Marco A Versiani; Clovis M Bramante Journal: Clin Oral Investig Date: 2020-05-07 Impact factor: 3.573
Authors: Maytté Marcano-Caldera; Jose Luis Mejia-Cardona; María Del Pilar Blanco-Uribe; Elena Carolina Chaverra-Mesa; Didier Rodríguez-Lezama; Jose Hernán Parra-Sánchez Journal: Restor Dent Endod Date: 2019-04-22