Abstract：
INTRODUCTION:The diagnosis and treatment planning of cracked teeth depend on the understanding of how cracks affect the surrounding tissues. This study evaluated the dentin and pulp conditions in teeth affected by cracks and attrition. METHODS:Specimens under investigation included 12 cracked posterior teeth and 8 teeth with severe attrition. These teeth were obtained consecutively in a private practice and were extracted for reasons not related to this study. Teeth were processed for histopathologic and histobacteriologic analyses. RESULTS:Cracks were histologically detected in all specimens, including the teeth with severe attrition. The cracks in all teeth were colonized by bacterial biofilms. One tooth showed several craze lines in the enamel, one of which reached dentin to a shallow depth. In some teeth, the crack ended in the dentin. Dentinal tubules were invaded by bacteria, especially when the crack extended perpendicularly into the dentin. Severe accumulations of inflammatory cells were present in the pulp zone subjacent to tubules involved with the crack. In many cases, the crack extended to the pulp, leading to reactions with intensities ranging from acute inflammation to total pulpal necrosis. Symptoms occurred in most cases in which the pulp was affected. In some cases, polymorphonuclear neutrophils were seen migrating from the pulp into the crack space and facing the bacterial biofilm located therein. Severe pulp reactions were also observed when the crack extended to the pulp chamber floor. CONCLUSIONS:Cracks are always colonized with bacterial biofilms. The pulp tissue response varies according to the location, direction, and extent of the crack.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Ricucci D,Siqueira JF Jr,Loghin S,Berman LHdoi
10.1016/j.joen.2014.09.021subject
Has Abstractpub_date
2015-03-01 00:00:00pages
343-52issue
3eissn
0099-2399issn
1878-3554pii
S0099-2399(14)00926-1journal_volume
41pub_type
杂志文章abstract：INTRODUCTION:Porphyromonas gingivalis and Tannerella forsythia are anaerobic bacteria commonly involved in root canal infections. Although previous investigations have assessed these species by strictly qualitative approaches, accurate determination of their cell levels by a sensitive quantitative technique may contrib...
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journal_title：Journal of endodontics
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abstract：:The state of contamination by methicillin-resistant Staphylococci, including methicillin-resistant Staphylococcus aureus (MRSA) at the conservative dentistry section of the School of Dentistry, Aichi-Gakuin University, was investigated. Methicillin-resistant coagulase-negative Staphylococci (MRCNS) were detected in 8 ...
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journal_title：Journal of endodontics
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journal_title：Journal of endodontics
pub_type： 共识发展会议,杂志文章
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journal_title：Journal of endodontics
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更新日期：1996-12-01 00:00:00
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更新日期：2018-05-01 00:00:00
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pub_type： 杂志文章,随机对照试验
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更新日期：2019-08-01 00:00:00
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更新日期：2015-12-01 00:00:00
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更新日期：2003-12-01 00:00:00
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更新日期：2020-02-01 00:00:00
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更新日期：2012-11-01 00:00:00
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journal_title：Journal of endodontics
pub_type： 杂志文章
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更新日期：2008-09-01 00:00:00
abstract：:The difference in resistance to bacterial invasion into the dentinal tubules between vital and nonvital teeth has not been determined. This study was conducted to clarify the effect of vital pulp on bacterial invasion into the dentinal tubules. The specimens were 19 intact pairs of bilateral upper third molars of 19 h...
journal_title：Journal of endodontics
pub_type： 杂志文章
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更新日期：1995-02-01 00:00:00
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