Abstract：
INTRODUCTION:The anatomy of the maxillary C-shaped molar has been the subject of several case reports although no true prevalence research has ever been conducted. The aim of this observational study was to evaluate and characterize the incidence of these morphologies using cone-beam computed tomographic (CBCT) technology. METHODS:Patients having presurgical CBCT examination were selected. CBCT analysis was performed at 5 different axial levels, and the teeth were classified as maxillary molar C shapes according to the inclusion criteria for the present investigation. The prevalence of C-shaped anatomy was calculated. The z test for proportions in independent groups was used to analyze the differences between proportions. Intrarater reliability was also tested. RESULTS:A total of 2227 teeth (928 upper first molars and 1299 upper second molars) from 895 patients were included in this research. Five different types of C-shaped molars were found, which included fusion between mesiobuccal and palatal roots (type A), mesiobuccal and distobuccal roots (type B), distobuccal and palatal roots (type C), 2 possible palatal roots (type D), and mesiobuccal and palatal roots connecting with an independent distobuccal root canal at apical or between distobuccal and palatal roots connecting with an independent mesiobuccal root canal at apical (type E). The global prevalence was 1.1% for first molars and 3.8% for second molars. Differences were observed between sex, teeth, and some types of C shapes at P < .05. CONCLUSIONS:Maxillary C-shaped molars have low prevalence but high anatomic complexity. An understanding of their anatomic configuration and variations is important in ensuring that they are treated properly. Distinct differences exist between C-shaped configurations of upper and lower molars.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Martins JN,Mata A,Marques D,Anderson C,Caramês Jdoi
10.1016/j.joen.2015.12.013subject
Has Abstractpub_date
2016-03-01 00:00:00pages
383-9issue
3eissn
0099-2399issn
1878-3554pii
S0099-2399(15)01143-7journal_volume
42pub_type
杂志文章abstract：INTRODUCTION:Cell migration is an important step in pulpal wound healing. Although components in the resin-based dental materials are known to have adverse effects on pulp wound healing including proliferation and mineralization, their effects on cell migration have been scarcely examined. Here, we investigated the eff...
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journal_title：Journal of endodontics
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journal_title：Journal of endodontics
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journal_title：Journal of endodontics
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更新日期：1996-06-01 00:00:00
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journal_title：Journal of endodontics
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journal_title：Journal of endodontics
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doi：10.1016/j.joen.2008.08.038
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journal_title：Journal of endodontics
pub_type： 杂志文章,评审
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journal_title：Journal of endodontics
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更新日期：2018-12-01 00:00:00
abstract：INTRODUCTION:Growth and differentiation factor-5 (GDF-5) is a multifunctional protein that regulates the development and repair in many tissues. The purpose of this study was to investigate whether GDF-5 may influence the proliferation, differentiation, and collagen turnover of human dental pulp cells. METHODS:Human d...
journal_title：Journal of endodontics
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更新日期：2013-10-01 00:00:00
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更新日期：2018-03-01 00:00:00
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journal_title：Journal of endodontics
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doi：10.1016/j.joen.2014.05.003
更新日期：2014-10-01 00:00:00
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journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200403000-00004
更新日期：2004-03-01 00:00:00
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journal_title：Journal of endodontics
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doi：10.1016/j.joen.2006.04.009
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journal_title：Journal of endodontics
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journal_title：Journal of endodontics
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更新日期：2013-08-01 00:00:00
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journal_title：Journal of endodontics
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journal_title：Journal of endodontics
pub_type： 杂志文章,随机对照试验
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更新日期：2018-01-01 00:00:00
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journal_title：Journal of endodontics
pub_type： 杂志文章,随机对照试验
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更新日期：2011-04-01 00:00:00
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更新日期：2011-08-01 00:00:00
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journal_title：Journal of endodontics
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更新日期：1998-09-01 00:00:00
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journal_title：Journal of endodontics
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更新日期：2014-12-01 00:00:00
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journal_title：Journal of endodontics
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更新日期：2017-01-01 00:00:00
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journal_title：Journal of endodontics
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