Thakur Manoj Kumar, Mishra Amit Kumar, Verma Tanya, Thota Lenin Babu, Saurabh Sandeep, Kumar Deepak
Department of Prosthodontics and Crown and Bridge, Garhwa, Jharkhand, India.
Department of Conservative Dentistry and Endodontics, Garhwa, Jharkhand, India.
J Pharm Bioallied Sci. 2021 Nov;13(Suppl 2):S1315-S1319. doi: 10.4103/jpbs.jpbs_137_21. Epub 2021 Nov 10.
The success of any restoration depends on the marginal seal. The adaptation of castings, luting cement, and the surface structures of the margins are all important factors in achieving marginal seal.
The aim of this study was to evaluate the vertical marginal discrepancy of cast copings obtained by employing conventional casting technique with two different base metal alloys with two different finish lines before and after porcelain firing.
A total of forty wax copings were fabricated with stainless steel die assembly and divided into four groups with ten specimens for each metal and each finish line. Measurements were recorded from coping margin to the stainless steel die margin for vertical marginal gap recordings. Each metal coping was finished, and porcelain application was completed. Copings with porcelain were placed on their respective dies, again subjected to the same measuring microscope for checking the vertical marginal discrepancy by the same operator and results.
The results of the present study showed that the mean vertical marginal gaps of all the cast copings obtained in each group (G1-G8) were within clinically acceptable limits. The mean vertical marginal gap of G1 was 135.36 ± 2.30 μm, G2 was 67.22 ± 4.25 μm, G3: 39.47 ± 2.98 μm, G4: 71.00 ± 3.97 μm, G5: 109.57 ± 2.98 μm, G6: 109.57 ± 2.98 μm, and G8: 114.58 ± 2.40 μm.
The difference in the vertical marginal gap of cast copings obtained in different groups was statistically highly significant at 0.005 level, while the difference in the vertical marginal gap of cast copings obtained at different points was statistically nonsignificant.
任何修复体的成功都取决于边缘封闭。铸件的适配性、粘结水门汀以及边缘的表面结构都是实现边缘封闭的重要因素。
本研究的目的是评估采用传统铸造技术，使用两种不同的贱金属合金以及两种不同的边缘线制作的铸造桩核在烤瓷前后的垂直边缘差异。
使用不锈钢模具组件制作了总共40个蜡型桩核，并根据金属种类和边缘线类型分为四组，每组10个样本。记录从桩核边缘到不锈钢模具边缘的垂直边缘间隙。对每个金属桩核进行修整，并完成烤瓷。将带有烤瓷的桩核放置在各自的模具上，再次由同一名操作人员使用同一测量显微镜检查垂直边缘差异并记录结果。
本研究结果表明，每组（G1 - G8）获得的所有铸造桩核的平均垂直边缘间隙均在临床可接受范围内。G1组的平均垂直边缘间隙为135.36 ± 2.30μm，G2组为67.22 ± 4.25μm，G3组为39.47 ± 2.98μm，G4组为71.00 ± 3.97μm，G5组为109.57 ± 2.98μm，G6组为109.57 ± 2.98μm，G8组为114.58 ± 2.40μm。
不同组获得的铸造桩核垂直边缘间隙差异在0.005水平上具有高度统计学意义，而在不同时间点获得的铸造桩核垂直边缘间隙差异无统计学意义。
