Herman Ostrow School of Dentistry, USC, Los Angeles, CA, USA.
Oper Dent. 2011 May-Jun;36(3):304-10. doi: 10.2341/10-210-L. Epub 2011 Jul 8.
The purpose of this study was to compare proximal contact tightness (PCT) of MOD resin composite restorations placed with different matricing protocols.
Forty-five ivorine lower right first molars with standardized MOD cavities were equally divided into three groups according to the restoration protocol. Group 1: Sectional matrix (Standard matrix, Palodent, Dentsply) secured with a wedge (Premier Dental Products Co.) and separation ring (BiTine I, Palodent, Dentsply, York, PA, USA) was used to restore the mesial surface first and then removed and repeated for the distal surface. Group 2: Identical to group 1, but separation rings were placed at both the mesial and distal sides (BiTine I+II, Palodent) prior to restoration. Mesial surface was restored followed by distal. Group 3: Walser matrix (O-form, Dr. Walser Dental GmbH) was used. Following composite resin restoration, PCT was measured using the tooth pressure meter. Data were analyzed using analysis of variance and a Tukey post hoc test (p<0.05).
PCT values for mesial contacts were 2.99 ± 0.47N for group 1, 4.57 ± 0.36N for group 2, and 3.03 ± 0.79N for group 3. For the distal contacts, the values were 4.46 ± 0.44N for group 1, 5.12 ± 0.13N for group 2, and 0.76 ± 0.77N for group 3. Significantly tighter contacts were obtained for mesial and distal contacts for group 2 compared to groups 1 and 3 (p<0.05). For groups 1 and 3, mesial contacts were not significantly different (p=0.993), while distal contacts for group 1 were significantly tighter (p<0.001).
Within the limitations of this study, tighter contacts can be obtained when sectional matrices and separation rings are applied to both proximal surfaces prior to placement of the resin composite in MOD cavities.
本研究旨在比较不同垫底材料方案放置 MOD 树脂复合材料修复体的近中接触紧密度（PCT）。
45 颗标准化的 MOD 牙体窝洞的象牙质下颌右侧第一磨牙被平均分为三组，依据修复方案不同而分组。第 1 组：使用分段式模具（标准模具，Palodent，Dentsply）结合楔子（Premier Dental Products Co.）和分离环（BiTine I，Palodent，Dentsply，York，PA，USA）先恢复近中面，然后去除并重复远中面的操作。第 2 组：与第 1 组相同，但在修复前于近中侧和远中侧放置分离环（BiTine I+II，Palodent），先恢复近中面，然后是远中面。第 3 组：使用 Walser 模具（O 型，Dr. Walser Dental GmbH）。完成复合树脂修复后，使用牙压计测量 PCT 值。采用方差分析和 Tukey 事后检验（p<0.05）对数据进行分析。
第 1 组近中接触的 PCT 值为 2.99 ± 0.47N，第 2 组为 4.57 ± 0.36N，第 3 组为 3.03 ± 0.79N。对于远中接触，第 1 组的值为 4.46 ± 0.44N，第 2 组为 5.12 ± 0.13N，第 3 组为 0.76 ± 0.77N。与第 1 组和第 3 组相比，第 2 组的近中和远中接触都获得了更紧密的接触（p<0.05）。第 1 组和第 3 组的近中接触没有显著差异（p=0.993），但第 1 组的远中接触明显更紧（p<0.001）。
在本研究的限制范围内，当分段式模具和分离环应用于 MOD 牙体窝洞的两个近表面，然后再放置树脂复合材料时，可获得更紧密的接触。
