Introduction:The abutment screw loosening has been a common clinical mishap affecting the success of the implant in the long run. With repeated insertion and removal of the implant abutment screw during fabrication of the restoration, frictional wear at the microscopic level in the screw threads had been reported.

Patients with orocutaneous fistulas suffer from discomfort in terms of facial esthetics, food spill over and lack of psychological confidence to present them socially. Prosthetic camouflaging of facial defects and use of silicone maxillofacial material are the alternatives to the surgical retreatment. Silicone elastomers provide more options to clinician for customization of the facial prosthesis which is simple, esthetically good when coupled with bio magnets for retention.

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Objective: Vertical dimension must be increased gradually in patients undergoing full mouth restorative therapy and any adverse symptoms during the process must be monitored. Occlusal splints are the best way to increase the vertical dimension in a patient. The present study is aimed to analyse the effect of different splints on the condylar position, verical dimension and EMG activity of masseter and anterior temporalis. Methodology: Patients with moderate to severe attrition were included in this randomized cross over study and were constituted into four groups (n=10). Canine to canine splint and full arch splint at both 1 mm (Group A, C) and 4mm (Group B, D) vertical dimension were made. The surface EMG activity of anterior temporalis and masseter muscle and Lateral cephalograms for condylar position assesmentwere recorded bilaterally pre and postoperatively after the insertion of the splints. Results:The mean EMG values (μV ) Masseter reduced from 263.10±24.7 to 147.15 ±12.77μV with the use of canine to canine 1mm splint , 134.7 ±14.72μV with the use of canine to canine 4mm splint, 145.47 ±26.86μV with the use of full arch 1mm splint, 139.04 ±28.21μV with the use of full arch 4mm splint. with a statistical significance (p<.001). Condylar position did not show a significant statistical difference (p>0.05). Conclusion:The occlusal splints were effective in reducing the masticatory muscle hyperactivity. The reduction in muscle activity was more at increased vertical dimension of 4mm when compared to 1mm splint. The splints were similar in positioning the condyles.

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