Effect of surface pretreatment with chemical etchants on bond strength between a silicone-based resilient liner and denture base resin
10.3760/cma.j.issn.1002-0098.2011.12.016
- VernacularTitle:丙酮及甲基丙烯酸甲酯表面处理对基托树脂与软衬材料粘接效果的影响
- Author:
Ying ZHANG
1
;
Huai-Qin ZHANG
;
Jun-Chi MA
;
Si-Yuan JIN
Author Information
1. 南京医科大学口腔医学研究所南京医科大学附属口腔医院
- Keywords:
Denture liners;
Composite resins;
Tensile strength;
Bending strength
- From:
Chinese Journal of Stomatology
2011;46(12):762-764
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the effect of denture base resin surface pretreatment with chemical etchants on microleakage and bond strength between silicone-based resilient liner and denture base resin.The initial bending strength of denture base resin after surface pretreatment was also examined.Methods Thirty-six polymethyl methacrylate(PMMA) denture base resin blocks(30 mm × 30 mm × 2 mm)were prepared and divided into three groups:group acetone,group methyl methy acrylate(MMA) and group control.Subsequently,a 2 mm silicone-based resilient liner was applied between every two blocks.After 5000 cycles in the thermal cycler ( 5 and 55 ℃ ),they were immersed in the 131 Ⅰ solution for 24 hours and γ-ray counts were measured.Another 36 PMMA resin blocks( 30 mm× 10 mm ×7.5 mm) were prepared.The blocks were divided into three groups and treated as mentioned above.A 3 mm silicone-based resilient liner was applied between every two blocks.After 5000 thermal cycles,tensile bond strength of the sample was measured in a universal testing machine.Another 18 PMMA resin blocks (65 mm × 10 mm ×3.3 mm) were prepared.They were divided into 3 groups and treated in the same way.After an adhesive was applied,the bending strength was measured with three-piont bending test.Results Two experimental groups showed lower microleakage(520.0 ±562.2 and 493.5 ±447.9) and higher tensile bond strength[( 1.5 ±0.4) and ( 1.4 ± 0.5 ) MPa]than the group control [microleakage:( 1369.5 ± 590.2 ) ; tensile bond strength:(0.9 ± 0.2) MPa,P ＜ 0.05].There was no statistically significant difference between group acetone and MMA in microleakage and tensile bond strength( P ＞ 0.05 ).There was no statistically significant difference in bending strength among the three groups ( P ＞ 0.05 ).Conclusions Treating the denture base resin surface with acetone and MMA decreased the microleakage,increased the tensile bond strength between the two materials and did not make the initial bending strength of denture base resin decline.
