Objective: Repair of acrylic part of removable orthodontic appliance involves, joining two parts of fractured appliance with acrylic. The study was designed to evaluate the effect of joint surface treatment on the fl exural strength of repaired auto-polymerized acrylic resin. Materials and Methods: 100 rectangular specimens were fabricated of clear auto-polymerized acrylic resin. Specimens were divided into fi ve groups (n=20) coded A to E. The Group A was intact specimens, used as a control. Other specimens were sectioned in the middle to simulate fracture. Group B had no joint surface treatment. In the remaining three groups, joint surface was treated with abrasive air blasting, methymethacrylate and acetone respectively. Specimens were repaired with pink auto-polymerized acrylic resin. The fl exural strength of the specimens was measured using a three - point bending test. The data was statistically analyzed using student’s t-test at p<.05. Results: Statistically signifi cant differences were found between the control and all repair groups. Within Repair groups, there were statistically signifi cant differences between untreated joint surface group and joint surface treated groups. There was no statistically signifi cant difference among joint surface treated groups. Conclusion: Mechanical joint surface treatment by abrasive air blasting or application of methylmethacrylate or acetone resulted in a signifi cant improvement in the fl exural strength of repaired auto-polymerized acrylic resin. However none of the repair method used in this study could produce comparable fl exural strength, as of intact auto-polymerized acrylic resin.
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A 2011 study studied this question.
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