Yanar Gamze N, Bodur Cengiz H, Yılmaz Tolga
Department of Pediatric Dentistry, Faculty of Dentistry, Gazi University, Ankara, Turkey.
Department of Metallurgical and Materials Engineering, Faculty of Technology, Gazi University, Faculty of Technology, Ankara, Turkey.
Int J Clin Pediatr Dent. 2025 Jul;18(7):814-819. doi: 10.5005/jp-journals-10005-3170. Epub 2025 Aug 20.
Matrix systems are essential for creating the best contacts in class II restorations. The objective of this study is to compare five different matrix systems in class II cavities in terms of proximal contact tightness and marginal overhang.
A total of 50 standardized second primary model teeth with class II cavities were printed using a three-dimensional (3D) printer. They were divided into five groups ( = 10). Resin restorations were made in each group; each tooth was placed on the full teeth model; and the model was placed in the universal testing machine for proximal contact tightness measurement. The maximum friction force was measured by moving an ivory matrix band in the occlusal direction. Digital images were obtained from the interproximal area with a stereomicroscope. Marginal overhang values were obtained by subtracting the cavity borders from the restoration borders. Comparison of mean values between groups was analyzed statistically by the Kruskal-Wallis test. Cohen's effect sizes were calculated for each group analysis.
There was no significant difference between matrix groups in terms of proximal contact tightness ( = 0.255). Marginal overhang values in restorations using Tofflemire were found to be significantly lower than Walser, Metafix, and Supercap. Omnimatrix was found to be significantly lower than Metafix and Supercap.
Among these five matrix systems, using the Tofflemire matrix can result in less overhang in primary molar restorations.
Although various matrix systems are being developed in modern dentistry, it has been observed that the Tofflemire matrix is still reasonable in terms of material overhang.
Yanar GN, Bodur CH, Yılmaz T. Evaluation of Contact Tightness and Marginal Overhang in Class II Primary Molar Restorations Restored with Different Matrix Systems. Int J Clin Pediatr Dent 2025;18(7):814-819.
成形片系统对于二类洞修复中获得最佳邻面接触至关重要。本研究的目的是比较五种不同的成形片系统在二类洞中的邻面接触紧密性和边缘悬突情况。
使用三维（3D）打印机打印出50颗带有二类洞的标准化第二乳磨牙模型牙。将它们分为五组（每组n = 10）。每组制作树脂修复体；将每颗牙齿放置在全牙模型上；然后将模型放置在万能试验机上测量邻面接触紧密性。通过沿咬合方向移动象牙色成形片带来测量最大摩擦力。用体视显微镜从邻面区域获取数字图像。通过从修复体边缘减去洞缘来获得边缘悬突值。组间均值比较采用Kruskal-Wallis检验进行统计学分析。对每组分析计算科恩效应量。
成形片组之间在邻面接触紧密性方面无显著差异（P = 0.255）。发现使用托菲米勒成形片的修复体边缘悬突值显著低于瓦尔泽、美塔菲克斯和超级帽成形片。发现全功能成形片显著低于美塔菲克斯和超级帽成形片。
在这五种成形片系统中，使用托菲米勒成形片可使乳磨牙修复体的悬突较少。
尽管现代牙科正在开发各种成形片系统，但据观察，托菲米勒成形片在材料悬突方面仍然是合理的。
亚纳尔GN，博杜尔CH，伊尔马兹T。不同成形片系统修复的二类乳磨牙修复体的接触紧密性和边缘悬突评估。《国际临床儿科牙科学杂志》2025；18（7）：814 - 819。
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