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- Title
Tightening and Loosening of the Abutment Screw Negatively Affects Implant Osseointegration in the Early Healing Stage in Rat Tibiae.
- Authors
Kenta Shobara; Toru Ogawa; Sitalaksmi, Ratri M.; Akiyo Ito; Makiko Miyashita; Aya Shibamoto; Keiichi Sasaki; Shobara, Kenta; Ogawa, Toru; Ito, Akiyo; Miyashita, Makiko; Shibamoto, Aya; Sasaki, Keiichi
- Abstract
<bold>Purpose: </bold>To examine the effect of tightening and loosening the dental implant screw on implant osseointegration in an elderly rat model.<bold>Materials and Methods: </bold>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.<bold>Results: </bold>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.<bold>Conclusion: </bold>Tightening and loosening the abutment screw might negatively affect dental implant osseointegration in the early healing stage in older adults.
- Subjects
DENTAL screws; OSSEOINTEGRATION; RATS; DENTAL implants; TORQUE; DENTURES; BONE screws; DENTISTRY; COMPUTED tomography; ANIMALS
- Publication
International Journal of Prosthodontics, 2021, Vol 34, Issue 2, p199
- ISSN
0893-2174
- Publication type
journal article
- DOI
10.11607/ijp.6398