Tightening and Loosening of the Abutment Screw Negatively Affects Implant Osseointegration in the Early Healing Stage in Rat Tibiae

Kenta Shobara, Toru Ogawa, Ratri M. Sitalaksmi, Akiyo Ito, Makiko Miyashita, Aya Shibamoto, Keiichi Sasaki

研究成果: Article査読

抄録

PURPOSE: To examine the effect of tightening and loosening the dental implant screw on implant osseointegration in an elderly rat model. MATERIALS AND METHODS: Titanium dental implants were inserted in the bilateral tibiae of 34 elderly Wistar rats (1 year and 3 months old). Rats were randomly divided into five groups: control (no loading); immediate loading (IL) (vertical load [3 Hz for 15 minutes/day] immediately after implantation); early loading (EL) (load started on postoperative day 7); five times abutment removal (R5) (tightening and loosening of the abutment screw once per day for 5 days each week); and two times abutment screw removal (R2) (tightening and loosening of the abutment screw once per day for 2 days each week). After 4 weeks, the rats were euthanized, and the bone structure surrounding the dental implants was evaluated using microcomputed tomography analysis. RESULTS: Osseointegration failed more frequently in the EL, R2, and R5 groups than in the control and IL groups (P = .06). The EL, R2, and R5 groups also tended to have lower relative gray values than the control and IL groups. CONCLUSION: Tightening and loosening the abutment screw might negatively affect dental implant osseointegration in the early healing stage in older adults.

本文言語English
ページ(範囲)199-203
ページ数5
ジャーナルThe International journal of prosthodontics
34
2
DOI
出版ステータスPublished - 2021 3 1

ASJC Scopus subject areas

  • 口腔外科

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