Comparative evaluation of occlusal force changes in mandibular premolar and molar implant-supported crown at 3 month and 6 month interval, using T-scan III: An in-vivo study.

Dental implants exhibit low proprioceptive feedback and low tactile sensitivity due to the absence of periodontal mechanoreceptors. Therefore, due to the weaker protective mechanism in dental implants, it seems that the occlusion concepts for implant-supported prostheses must be modified. Objectives of implant occlusion are to minimize overload on bone implant interface and implant prosthesis to maintain implant load within physiologic limits of individual occlusion and finally to provide long term stability to implant and implant prosthesis**.**Because of the light occlusion after the implant prostheses delivery the natural dentition opposing implant crown continues to erupt so that contact with the implant-supported prosthesis will be established. This may play an important role in the subsequent changes in occlusal force distribution and Occlusion Time. The T-Scan III system can accurately identify occlusal force distribution and the sequence of occlusal time in natural teeth and implant prostheses. The purpose of this clinical study was to describe and analyse the longitudinal variation of occlusal contact, including changes in occlusion time and disocclusion time in single posterior fixed implant supported prostheses by using the T-Scan III system. The rational or need of the study is to analyse changes in occlusion time and disocclusion time in single posterior partial fixed implant supported prostheses over time. The analysis will be done before placement of implant supported crown, immediately after placement and at an interval of 3 and 6 months in partially edentulous patients.

PRIMARY OBJECTIVE: 1)To evaluate and compare occlusal force changes in Premolar implant supported crown at 3 and 6 months interval using T-scan III. 2)To evaluate and compare occlusal force changes in Molar implant supported crown at 3 and 6 months interval using T-scan III 3) To quantify the occlusal force changes of Premolar and Molar implant supported crown at 3 and 6 months interval using T-scan III

METHOD OF MEASUREMENT: A complete case history of the patient will be taken, 20 patients in age group 18-60 years will be evaluated. Each patient will be explained in detail about the procedure in the local vernacular language (Marathi, Hindi or English). They will be informed about their right to refuse and will be then asked to sign the consent form. After 3 months of first stage implant placement surgery, healing abutment will be placed and impression will be taken after 10-15 days. Metal fused with ceramic crowns will be fabricated. After 3 months of first stage implant placement surgery, healing abutment will be placed and impression will be taken after 10-15 days. Metal fused with ceramic crowns will be fabricated. Try in and T-scan evaluation will be done. The occlusal force on distal tooth is checked immediately after crown placement and it is ensured that it remains constant on subsequent scanning for reference or standardizing purpose. Changes in occlusal force on premolar implant-supported crown (Group A) and Molar implant- supported crown (Group B) will be evaluated at 3 and 6 month time interval. The study protocol design will be approved by the Institutional Ethics Committee. Changes in occlusal force on premolar implant-supported crown (Group A) and Molar implant- supported crown (Group B) will be evaluated at 3 and 6 month time interval. The study protocol design will be approved by the Institutional Ethics Committee