Sudhakar R, Pratebha B
Department of Oral Pathology, Sri Venkateshwaraa Dental College, Ariyur, Puducherry, India.
Department of Periodontics, Indira Gandhi Institute of Dental Sciences, SBVU, Puducherry, India.
J Oral Maxillofac Pathol. 2015 Sep-Dec;19(3):325-9. doi: 10.4103/0973-029X.174623.
The cementodentinal junction (CDJ) forms a biological and structural link between cementum and dentin. This biological link is regarded as a distinct tissue in its own right. Certain important proteins responsible for periodontal regeneration are said to be present in this tissue. Few studies have described the structure and composition of this layer by light and electron microscopy. Scanning electron microscopic studies pertaining to CDJ in health and disease are few and documentation of periodontal pathological changes of CDJ is unclear. In the first phase of our study, the collagenous architecture of CDJ of healthy teeth has been reported.
The objective of this study is to observe and report periodontal pathological changes in the fibrous or collagenous architecture of CDJ of periodontitis-affected teeth and discuss the probable clinical implications of CDJ in disease.
Twenty periodontitis-affected teeth were collected and processed for observing under a scanning electron microscope.
The results are as follows: Increased width of interface at CDJ in periodontitis samples (7.1 μ) compared to that of healthy samples; fewer areas of fiber intermingling at CDJ in periodontitis samples as compared to healthy samples; frequent detachment of cementum from dentin during sodium hydroxide maceration of samples.
It may be inferred from results that there is a possibility of a definite weakening of CDJ in periodontally affected root surfaces and we believe that clinical procedures such as scaling and root planning may have a detrimental effect on the cementodentinal attachment of periodontally involved root surfaces.
牙骨质牙本质界（CDJ）在牙骨质和牙本质之间形成了生物学和结构上的联系。这种生物学联系本身被视为一种独特的组织。据说某些负责牙周组织再生的重要蛋白质存在于该组织中。很少有研究通过光学显微镜和电子显微镜描述该层的结构和组成。关于健康和患病状态下CDJ的扫描电子显微镜研究较少，且CDJ牙周病理变化的记录尚不清楚。在我们研究的第一阶段，已经报道了健康牙齿CDJ的胶原结构。
本研究的目的是观察和报告牙周炎患牙CDJ纤维或胶原结构中的牙周病理变化，并讨论CDJ在疾病中的可能临床意义。
收集20颗牙周炎患牙并进行处理，以便在扫描电子显微镜下观察。
结果如下：与健康样本相比，牙周炎样本中CDJ处界面宽度增加（7.1μm）；与健康样本相比，牙周炎样本中CDJ处纤维交织区域减少；在样本氢氧化钠浸软过程中，牙骨质与牙本质频繁分离。
从结果可以推断，牙周病累及的牙根表面CDJ可能确实存在一定程度的弱化，并且我们认为诸如刮治和根面平整等临床操作可能会对牙周病累及的牙根表面的牙骨质牙本质附着产生不利影响。
