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Aim:To evaluate the effect of surface treatments of implant abutment and metal framework on the retention of implant-supported cement-retained bridge with short abutments. Methodology:Straight implant abutments of sizes (4.3 mm × 4 mm) and analogues were selected and mounted on the acrylic block. Four such assemblies were made. 40 number of 3-unit metal framework were casted and divided into four groups. Group 1- (control group) No modification. Group 2- The abutments were subjected to surface modifications by bur, cementing surface of the framework was sandblasted. Group 3- The abutments were subjected to surface modifications by bur and framework was sandblasted and also subjected to alloy primer (M.L. Primer Shofu Inc.) Group 4- Both the abutment and framework are subjected to sandblasting and alloy primer. The framework was cemented with a Resin cement (Panavia F). Retention tests were conducted with a universal testing machine (5 mm/min), and tensile bond strengths were recorded. Statistics:Data were subjected to one-way analysis of variance, Post Hoc Tukey’s significant difference test, (α = 0.05). Results:The mean retentive force for Group 1 was 200.70 +- 22.930 N, for Group 2 was 460.70 +- 96.40 N, for Group 3 was 749.80 +- 134.474 N and for Group 4 was 658.00 +- 20.025 N. Group 3 showed highest mean peak force required for dislodging the metal framework from the abutments after cementation than all the other groups at 749.80 N. Conclusion:Modification of the implant abutment by bur and sandblasting while modification of 3-unit metal framework by sandblasting and alloy primer showed the highest retention and demonstrated the significant difference in the tensile bond strength than all other groups. |
