Kirthiga M, Muthu M S, Kayalvizhi G, Krithika C
Department of Pedodontics and Preventive Dentistry, Sri Ramachandra University, Chennai, India.
Department of Pedodontics and Preventive Dentistry, Indira Gandhi Institute of Dental Sciences, Puducherry, India.
Wellcome Open Res. 2018 Sep 27;3:98. doi: 10.12688/wellcomeopenres.14713.2. eCollection 2018.
Interproximal contact areas in primary teeth are known to be broader, flatter, and situated more gingivally than in permanent teeth. The objective of the present study was to evaluate the different types of intact interproximal contact areas in primary teeth using cone beam computed tomography (CBCT) among children. A cross-sectional study was designed with 74 contacts from 28 existing CBCT images of children aged between 3 and 14 years, obtained from the Indian Dental Education Academy, Chennai, India. The shape of the contact area was observed at three levels, the coronal, middle, and apical thirds, in three different sections of CBCT. Prevalence of the types of contact areas was expressed in the form of numbers and percentages. The weighted Cohen's kappa values for inter-examiner reliability was 0.893 at baseline. Results exhibited four different types of contact areas between the primary molars, namely, O type, X type, I type, and S type, based on the shapes observed; hence, the proposed classification is referred to as OXIS. The most common pattern seen was I (66.2%), followed by X (21.6%), O (9.4%) and the least common was S (2.7%). The three-dimensional evaluation of intact interproximal contact areas between primary molars are of four types, O,X, I and S.
乳牙的邻面接触区比恒牙的更宽、更平，且位置更靠近牙龈。本研究的目的是使用锥形束计算机断层扫描（CBCT）评估儿童乳牙中不同类型的完整邻面接触区。本研究设计为一项横断面研究，从印度金奈印度牙科教育学院获取了74个3至14岁儿童的现有CBCT图像中的接触区。在CBCT的三个不同截面中，在冠方、中间和根尖三分之一处观察接触区的形状。接触区类型的患病率以数字和百分比的形式表示。检查者间可靠性的加权Cohen's kappa值在基线时为0.893。根据观察到的形状，结果显示乳磨牙之间存在四种不同类型的接触区，即O型、X型、I型和S型；因此，所提出的分类被称为OXIS。最常见的模式是I型（66.2%），其次是X型（21.6%）、O型（9.4%），最不常见的是S型（2.7%）。乳磨牙之间完整邻面接触区的三维评估有四种类型，即O型、X型、I型和S型。
