Retrieval Of A Fractured And Retained Percutaneous Coronary Angioplasty Catheter On Beating Perfused Heart

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 flexural strength of repaired autopolymerized acrylic resin.Materials and Methods: 100 rectangular specimens were fabricated of clear auto-polymerized acrylic resin.Specimens were divided into five 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 flexural 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 significant differences were found between the control and all repair groups.Within Repair groups, there were statistically significant differences between untreated joint surface group and joint surface treated groups.There was no statistically significant difference among joint surface treated groups.Conclusion: Mechanical joint surface treatment by abrasive air blasting or application of methylmethacrylate or acetone resulted in a significant improvement in the flexural strength of repaired auto-polymerized acrylic resin.However none of the repair method used in this study could produce comparable flexural strength, as of intact autopolymerized acrylic resin.