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High Bone-Implant Contact Achieved by Photofunctionalization to Reduce Periimplant Stress: A Three-Dimensional Finite Element Analysis

Ohyama, Tetsuo DDS, PhD*; Uchida, Tendo DDS; Shibuya, Norio DDS; Nakabayashi, Shinya DDS, PhD; Ishigami, Tomohiko DDS, PhD§; Ogawa, Takahiro DDS, PhD

doi: 10.1097/ID.0b013e31827b9415
Basic and Clinical Research
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Objective: A recent study demonstrated that UV treatment of titanium implants (photofunctionalization) enabled a higher level of osseointegration by establishing a 98.2% bone-implant contact (BIC) as opposed to a 53.0% BIC around untreated implants. This study examined whether, and how, the BIC increase affects the periimplant mechanical stress.

Materials and Methods: Three-dimensional finite element analysis was performed on implants of different degrees of BIC (53.0% and 98.2%) based on the report of photofunctionalization. The different lengths of implants (7, 10, and 13 mm) were also tested.

Results: Increasing the implant length from 7 to 13 mm diminished the periimplant stress level by only 15% under vertical load, whereas increasing BIC from 53.0% to 98.2% diminished it by 50%. Consequently, stress around 7-mm implants with 98.2% BIC was even lower than that around 13-mm implants with 53.0% BIC. High-stress areas, which were observed around implants in all lengths with 53.0% BIC, disappeared on implants with 98.2% BIC even on 7-mm implants. Similar results were obtained under oblique load.

Conclusions: This study demonstrated that a BIC increase from 53.0% to 98.2%, which can be achieved by photofunctionalization, improves distribution and diffusion of periimplant stress more effectively than using longer implants, providing a potential novel strategy to counteract stress-induced periimplant marginal bone loss.

*Clinical Associate Professor, Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan.

Graduate Student, Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan.

Assistant Professor, Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan.

§Professor, Department of Partial Denture Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan.

Professor, Laboratory for Bone and Implant Sciences (LBIS), The Weintraub Center for Reconstructive Biotechnology and Divisions of Advanced Prosthodontics, Biomaterials, and Hospital Dentistry, UCLA School of Dentistry, Los Angeles, CA.

Reprint requests and correspondence to: Takahiro Ogawa, DDS, PhD, Laboratory for Bone and Implant Sciences (LBIS), The Weintraub Center for Reconstructive Biotechnology and Divisions of Advanced Prosthodontics, Biomaterials, and Hospital Dentistry, UCLA School of Dentistry, 10833 Le Conte Avenue (B3-081 CHS), Box 951668, Los Angeles, CA 90095-1668, Phone: 1-310-825-0727, Fax: 1-310-825-6345, E-mail: togawa@dentistry.ucla.edu

© 2013 Lippincott Williams & Wilkins, Inc.