Improvement of fatigue strength and biocompatibility of Ti-6Al-4V for dental implant by low energy laser peening

低エネルギーレーザーピーニングによる歯科インプラント用チタン合金の疲労強度と生体適合性の改善

飯野 雄基*; 秋田 貢一*; 佐野 雄二*; 水田 好雄*; 玉置 悟司*; 菖蒲 敬久  

Iino, Yuki*; Akita, Koichi*; Sano, Yuji*; Mizuta, Yoshio*; Tamaki, Satoshi*; Shobu, Takahisa

Currently, aging society is progressing worldwide, and then it is important to expand healthy life expectancy. From the research results of heathy life, oral health has been found to be affected healthy life expectancy. Therefore, dental implant treatments have become widely used. However, fracture of the implant components has been reported. This study attempted to solve this problem by Low Energy Laser Peening (LELP). It uses lower energy than that of current Laser Peening (CLP). For example, the energy in CLP is 200 mJ while it is 1.5 mJ in LELP. A previous study reported that CLP couldn't improve the fatigue strength of a miniature size specimen of Ti-6Al-4V for implant components because the introduced compressive residual stress layer was too large and therefore balancing tensile residual stress became relatively high. In contrast, LELP introduces relatively thinner compressive stress layer and small balancing tension. Therefore, LELP is thought suitable for enhancing fatigue strength of miniature size samples. This study focuses on the fatigue strength enhancement of Ti-6Al-4V by LELP. Biocompatibility of the LELP treated surface is also examined. Results will be presented at the conference.