Pinheiro Bethânia Camargo, Pinheiro Tiago Novaes, Capelozza Ana Lúcia Alvarez, Consolaro Alberto
Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
J Appl Oral Sci. 2008 Nov-Dec;16(6):380-4. doi: 10.1590/s1678-77572008000600005.
The purpose of this study was to evaluate morphological characteristics of teeth with hypercementosis that are relevant to endodontic practice. Twenty-eight extracted teeth with hypercementosis had their root apexes analyzed by scanning electron microscopy (SEM). The teeth were divided according to tooth groups and type of hypercementosis. The following aspects were examined under SEM: the contour and regularity of the root surface; presence of resorption; presence and number of apical foramina, and the diameter of the main foramen. The progression of club shape hypercementosis was directly associated with the presence of foramina and apical foramen obstruction. Cases of focal hypercementosis presented foramina on the surface, even when sidelong located in the root. Circular cementum hyperplasia form was present in 2 out of 3 residual roots, which was the highest proportion among the tooth types. The detection of a large number of foramina in the apical third of teeth with hypercementosis or even the possible existence of apical foramen obliteration contributes to understand the difficulties faced during endodontic treatment of these cases.
本研究的目的是评估与牙髓治疗相关的牙骨质增生牙齿的形态特征。对28颗患有牙骨质增生的拔除牙齿的根尖进行扫描电子显微镜（SEM）分析。根据牙齿组别和牙骨质增生类型对牙齿进行分类。在扫描电子显微镜下检查以下方面：牙根表面的轮廓和规则性；吸收的存在情况；根尖孔的存在情况和数量，以及主根尖孔的直径。棒状牙骨质增生的进展与根尖孔的存在和根尖孔阻塞直接相关。局灶性牙骨质增生病例即使在牙根侧面也在表面出现根尖孔。在3颗残根中有2颗存在环形牙骨质增生，这在各类牙齿中所占比例最高。在患有牙骨质增生的牙齿根尖三分之一处检测到大量根尖孔，甚至可能存在根尖孔闭锁，这有助于理解这些病例在牙髓治疗过程中所面临的困难。
