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VOLUME 8 , ISSUE 2 ( April-June, 2018 ) > List of Articles


Time-dependent Changes in Occlusal Status in an Implantsupported Prosthesis at the Mandibular First Molar from Prosthesis Placement to 3 Months After

Yuji Sato, Noboru Kitagawa, Mayumi Terazawa, Tokiko Osawa, Yoshiki Imamura

Keywords : BiteEye, Clenching strength, Cohort study, Implant, Occlusal contact area, Occlusal load, Occluzer, Time-dependent change.

Citation Information : Sato Y, Kitagawa N, Terazawa M, Osawa T, Imamura Y. Time-dependent Changes in Occlusal Status in an Implantsupported Prosthesis at the Mandibular First Molar from Prosthesis Placement to 3 Months After. Int J Prosthodont Restor Dent 2018; 8 (2):44-53.

DOI: 10.5005/ijoprd-8-2-44

License: CC BY-SA 4.0

Published Online: 01-12-2010

Copyright Statement:  Copyright © 2018; The Author(s).


Aim: The purpose of this study was to elucidate time-dependent changes in occlusal status over a 3-month period to understand dynamic factors that act on implant-supported prosthesis. We used pressure-sensitive film for occlusal force diagnostics and silicone testing material to measure the occlusal status of a mandibular first molar implant-supported prosthesis under controlled clenching strengths. Materials and methods: The subjects were eight patients who had an implant-supported prosthesis inserted at the mandibular first molar and did not have any missing teeth other than the implants. We performed the following tests immediately and 3 months after fitting the prosthesis. First, we monitored masseter muscle activity and defined maximum clenching strength as 100% maximum voluntary contraction (MVC). We then used pressure-sensitive film and a clenching strength measuring device to measure occlusal load and occlusal contact area at clenching strengths of 40, 60, 80, and 100% MVC. Finally, we used silicone testing material and an occlusal contact measurement device to measure occlusal contact area at clenching strengths of 20, 40, and 60% MVC. Results: Occlusal load and occlusal contact area of the bilateral molar region increased at all clenching strengths 3 months after fitting the prosthesis. However, the quotient of bilateral molar occlusal contact area divided by occlusal load (contact area/ load) showed no significant changes after 3 months for any of the clenching strengths. There was also no significant change observed in occlusal load of the prosthesis, occlusal contact area of the prosthesis and contact area/load significantly Conclusion: Wearing an implant-supported prosthesis for 3 months increased clenching strength, which increased the overall bilateral molar occlusal contact area and occlusal load. Our findings suggest that implant-supported prostheses increase occlusal contact area at high clenching strengths after 3 months of use. Clinical significance: This study suggested that implantsupported prosthesis which have ideal occlusal contact status need to be checked and occlusal status adjusted regularly for its prediction.

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