Kumari Suchitra, Raghu Ramya, Shetty Ashish, Rajasekhara Subhashini, Padmini Souparnika Divakaran
Department of Conservative Dentistry and Endodontics, Bangalore Institute of Dental Sciences, Bengaluru, Karnataka, India.
J Conserv Dent. 2023 Jan-Feb;26(1):67-72. doi: 10.4103/jcd.jcd_403_22. Epub 2022 Dec 8.
Sectional matrices and contact rings are valuable aids to establish proximal contact tightness in Class II composite restorations.
This study aims to evaluate the proximal contact area in Class II composite restorations using three matrix systems based on morphological analysis, mesiodistal (M-D) diameter and contact tightness.
A standardized DO cavity was prepared in 30 plastic molar teeth. They were randomly divided into three groups ( = 10) and restored using Tetric N-Ceram composite material and three matrix systems - Saddle matrix, Palodent system, and Palodent Plus system. The quality of proximal contacts was assessed by measuring the maximum M-D diameter of the restored teeth using a digital caliper; the tightness of the proximal contact area using Unifloss and a standardized metal blade (30 μm). Qualitative assessment of contact morphology was done by visual means while quantitative assessment of contour was done using Medit scanner superimposing method and ExoCAD software.
One-way ANOVA test was used to compare the mean M-D diameter (in mm) in the occlusal third, middle third, and the proximal contact area between the three groups. Chi-square test was used to compare the proximal contact area tightness using the passage of Unifloss. The buccolingual and occluso-gingival morphology was also compared among the three groups. The level of significance ( value) was set at < 0.05.
For the occlusal and middle third, significantly larger diameters were achieved with the Palodent Plus system than with the Saddle matrix. More flat contours were seen in the case of the Saddle matrix than in the case of the Palodent system while the Palodent Plus system exhibited a minimal depth of concavity as determined by three-dimensional imaging of the contact morphology.
Palodent Plus and Palodent matrix systems established superior contacts and contours than the Saddle matrix.
分段式成型片和接触环是用于确定Ⅱ类复合树脂修复体邻面接触紧密性的重要辅助工具。
本研究旨在基于形态学分析、近远中（M-D）直径和接触紧密性，使用三种成型片系统评估Ⅱ类复合树脂修复体的邻面接触区域。
在30颗塑料磨牙上制备标准化的邻合面洞型。将它们随机分为三组（每组n = 10），使用Tetric N-Ceram复合材料和三种成型片系统——鞍形成型片、Palodent系统和Palodent Plus系统进行修复。通过使用数字卡尺测量修复后牙齿的最大M-D直径来评估邻面接触的质量；使用Unifloss和标准化金属片（30μm）评估邻面接触区域的紧密性。通过视觉手段对接触形态进行定性评估，同时使用Medit扫描仪叠加法和ExoCAD软件对外形进行定量评估。
采用单因素方差分析检验比较三组在咬合面三分之一、中间三分之一和邻面接触区域的平均M-D直径（单位：mm）。使用卡方检验比较Unifloss通过情况的邻面接触区域紧密性。还比较了三组之间的颊舌向和咬合龈向形态。显著性水平（P值）设定为P < ０.０５。
对于咬合面和中间三分之一，Palodent Plus系统获得的直径显著大于鞍形成型片。鞍形成型片的外形比Palodent系统更扁平，而根据接触形态的三维成像确定，Palodent Plus系统显示出最小的凹陷深度。
Palodent Plus和Palodent成型片系统比鞍形成型片建立了更好的接触和外形。
