• Orapin Kaewplung D .D.S.,P h.D.( Maxillofacial Prosthodontics
• Panita Cheowchan
• Palika Luangruangrong

Objectives The purposes of this study were to compare the shear bond strength of two types of alloy to self-curing acrylic resin using different metal surface treatments and to use the results to apply for removable partial denture framework repairing.

Materials and methods (11 mm in diameter, 2.5 mm in thickness) were cast of Co-Cr alloy and Ti-6Al-7Nb alloy. Each was divided into 7 groups, 10 samples per group: no surface treatments [C], acid-etching [E], sandblasting [S], acid-etching + sandblasting [ES], acid-etching + sandblasting + alloy primer [ESA], sandblasting + alloy primer [SA], sandblasting + alloy primer + Panavia F^® [SAP]. Then attached the specimens to self-curing acrylic resin which was fabricated in cylindrical shape (0.5 mm in diameter, 3 mm in thickness), left the acrylic resin until its complete setting for 30 minutes. All specimens were immersed in 37°C water for 24 hours. Shear bond strength values were determined at a crosshead speed of 10 mm/min. Data were statistically analyzed using one-way ANOVA and Independent samples T-Test.

Results The highest mean of shear bond strength value in Co-Cr alloy group was the group of ESA (295.61 + 8.67N). For the Ti-6Al-7Nb group, the highest mean value was the group of SA (299.53 + 5.14N).

Conclusions From this study, it is recommended that suitable method for alloy surface treatment before bonding with self-curing acrylic resin in removable partial denture repairing, in Co-Cr is acid-etching with sandblasting and alloy primer and in Ti-6Al-7Nb is sandblasting with alloy primer.

(CU Dent J. 2004;27:195-206)