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

JOURNAL TITLE: International Journal of Prosthodontics and Restorative Dentistry

Author
1. Mayumi Terazawa
2. Yoshiki Imamura
3. Yuji Sato
4. Tokiko Osawa
5. Noboru Kitagawa
ISSN
2231-6361
DOI
10.5005/ijoprd-8-2-44
Volume
8
Issue
2
Publishing Year
2018
Pages
10
Author Affiliations
    1. Department of Geriatric Dentistry, School of Dentistry, Showa University, Otaku, Tokyo, Japan
    1. Department of Geriatric Dentistry, School of Dentistry, Showa University, Otaku, Tokyo, Japan
    1. Department of Geriatric Dentistry, School of Dentistry, Showa University, Otaku, Tokyo, Japan
  • Article keywords
    BiteEye, Clenching strength, Cohort study, Implant, Occlusal contact area, Occlusal load, Occluzer, Time-dependent change.

    Abstract

    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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