Matha Niharika, Kumar Kotha Sudheer, Reddy Bv Thimma, Chowdary Birapu Uday Kumar, Kumar R Hemanth, Kumar J Raghavendra, Ravali G
Department of Pedodontics and Preventive Dentistry, SVS Institute of Dental Sciences, Mahbubnagar, Telangana, India.
Department of Pediatric and Preventive Dentistry, SVS Institute of Dental Sciences, Mahbubnagar, Telangana, India.
Int J Clin Pediatr Dent. 2024 Apr;17(Suppl 1):S43-S54. doi: 10.5005/jp-journals-10005-2815.
The present randomized clinical trial is aimed at evaluating clinical efficiency of two different types of esthetic crowns-polymethyl methacrylate crowns and vacuum formed thermoformed crown as an alternative to full-coverage coronal restoration for deciduous molars.
A total of 45 primary molars in pediatric patients were selected using randomization and split into three groups based on the technique used for preparation of crowns: group I-polymethyl methacrylate crowns; group II-thermoformed crown; and group III-stainless steel crowns (SSC). All crowns were clinically and radiographically evaluated at baseline, 1st month, and 3rd month for gingival health, retention, marginal integrity, proximal contacts, occlusion, alignment, and staining.
The data was tabulated and analyzed by Statistical Package for the Social Sciences (SPSS) Version 23.0 software. The intergroup comparison was done by Kruskal-Wallis test, analysis of variance (ANOVA), and Mann-Whitney test for continuous data. The intragroup comparison was done by Friedman test and Wilcoxon signed-rank test for categorical data. All -values < 0.05 were considered statistically significant.
With regard to the parameters of plaque score, gingival index score, occlusion, interproximal contacts, retention, alignment, and marginal adaptation, no statistical significance was noted between the three groups. However, with regard to the discoloration (staining) when the polymethyl methacrylate acrylic (PMMA) group was compared with thermoforming group, statistical significance was noted in 1st month with -values of 0.04 and 0.03, respectively. On intragroup comparison, statistically significant values were obtained in SSC group for plaque score and thermoforming group for gingival index score.
The study concluded that the PMMA and thermoforming crowns can be used as an alternative to SSC for restoring the primary molars as they showed equivalent results to that of standard SSC.
Matha N, Kumar KS, Reddy BVT, Comparative Evaluation of Polymethyl Methacrylate and Thermoforming Crowns as Semipermanent Crowns in Primary Molars: An Study. Int J Clin Pediatr Dent 2024;17(S-1):S43-S54.
本随机临床试验旨在评估两种不同类型的美学冠——聚甲基丙烯酸甲酯冠和真空热成型冠，作为乳牙全冠修复替代方法的临床效果。
采用随机化方法选取45颗儿科患者的乳牙，根据冠制备技术分为三组：第一组——聚甲基丙烯酸甲酯冠；第二组——热成型冠；第三组——不锈钢冠（SSC）。在基线、第1个月和第3个月对所有冠进行临床和影像学评估，评估指标包括牙龈健康、固位、边缘完整性、邻面接触、咬合、排列和染色情况。
数据用社会科学统计软件包（SPSS）23.0版软件进行制表和分析。连续数据的组间比较采用Kruskal-Wallis检验、方差分析（ANOVA）和Mann-Whitney检验。分类数据的组内比较采用Friedman检验和Wilcoxon符号秩检验。所有P值<0.05被认为具有统计学意义。
在菌斑评分、牙龈指数评分、咬合、邻面接触、固位、排列和边缘适应性等参数方面，三组之间未发现统计学差异。然而，在聚甲基丙烯酸甲酯丙烯酸（PMMA）组与热成型组比较变色（染色）情况时，第1个月有统计学差异，P值分别为0.04和0.03。组内比较时，不锈钢冠组菌斑评分和热成型组牙龈指数评分有统计学意义。
该研究得出结论，聚甲基丙烯酸甲酯冠和热成型冠可作为不锈钢冠的替代方法用于乳牙修复，因为它们显示出与标准不锈钢冠相当的效果。
Matha N, Kumar KS, Reddy BVT, 聚甲基丙烯酸甲酯冠和热成型冠作为乳牙半永久性冠的比较评价：一项研究。《国际临床儿科牙科学杂志》2024；17（S-1）：S43-S54。
