Li Gray H, Mudaliar Vidya, Cameron Andrew B, Aarts John M, Choi Joanne J E
Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand.
Department of Oral Rehabilitation, School of Dentistry and Oral Health, College of Medicine Nursing and Health Science, Fiji National University, Suva, Fiji.
Clin Exp Dent Res. 2025 Feb;11(1):e70127. doi: 10.1002/cre2.70127.
To evaluate the effect of the size of stainless steel mesh and universal adhesive primer on the flexural strength of repaired polymethylmethacrylate (PMMA) denture base resin.
A total of 120 heat-cured PMMA specimens with dimensions of 5 × 50 × 30 mm were prepared and repaired with two different sizes of stainless steel mesh reinforcement, one group with med-fine mesh (size 0.42 mm) and the second group with fine mesh (size 0.09 mm). One subgroup was primed with a universal adhesive primer (Scotchbond Universal). Half of the specimens from each subgroup were subjected to artificial aging. The flexural strength was obtained by three-point bend testing. Data were statistically analyzed using ANOVA and post hoc analysis (SPSS V28). The probability of failure was calculated using Weibull analysis. Scanning electron microscopy analysis was used to identify the mode of failure.
A significantly higher mean flexural strength (p < 0.05) was recorded in primed groups non-thermocycled with fine mesh (174.80 ± 50.27 MPa) and medium mesh (160.87 ± 41.50 MPa) compared to non-primed groups. Non-primed specimens with fine mesh exhibited the highest Weibull modulus (5.86), whereas that of primed medium mesh had the lowest Weibull modulus (2.64). Adhesive failure was identified at the interface of the stainless steel mesh and the self-cure acrylic resin.
Application of the universal adhesive primer to both mid-fine and fine stainless steel mesh significantly improved the flexural strength of the repaired PMMA heat-cured acrylic resin, and reinforcement with primed fine stainless steel mesh resulted in significantly higher flexural strength of repaired PMMA heat-cured an acrylic resin.
评估不锈钢网尺寸和通用粘结剂底漆对修复的聚甲基丙烯酸甲酯（PMMA）义齿基托树脂弯曲强度的影响。
制备120个尺寸为5×50×30mm的热固化PMMA试件，并用两种不同尺寸的不锈钢网增强材料进行修复，一组使用中细网（尺寸0.42mm），另一组使用细网（尺寸0.09mm）。一个亚组用通用粘结剂底漆（Scotchbond Universal）进行底漆处理。每个亚组的一半试件进行人工老化。通过三点弯曲试验获得弯曲强度。使用方差分析和事后分析（SPSS V28）对数据进行统计分析。使用威布尔分析计算失效概率。使用扫描电子显微镜分析确定失效模式。
与未进行底漆处理的组相比，用细网（174.80±50.27MPa）和中细网（160.87±41.50MPa）进行非热循环处理的底漆处理组记录到显著更高的平均弯曲强度（p<0.05）。未进行底漆处理的细网试件表现出最高的威布尔模量（5.86），而底漆处理的中细网试件的威布尔模量最低（2.64）。在不锈钢网和自凝丙烯酸树脂的界面处发现粘结失效。
将通用粘结剂底漆应用于中细和细不锈钢网均可显著提高修复的热固化PMMA丙烯酸树脂的弯曲强度，并且用底漆处理的细不锈钢网增强可使修复的热固化PMMA丙烯酸树脂的弯曲强度显著更高。
