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Influence of early cover screw exposure on crestal bone loss around implants: intraindividual comparison of bone level at exposed and non-exposed implants

 Tae-Hyung Kim  ;  Dong-Won Lee  ;  Chong-Kwan Kim  ;  Kwang-Ho Park  ;  Ik-Sang Moon 
 JOURNAL OF PERIODONTOLOGY, Vol.80(6) : 933-939, 2009 
Journal Title
Issue Date
Adult ; Aged ; Aged, 80 and over ; Alveolar Bone Loss/etiology* ; Dental Abutments ; Dental Implantation, Endosseous/instrumentation* ; Dental Implantation, Endosseous/methods ; Dental Implants* ; Female ; Follow-Up Studies ; Gingiva/pathology* ; Gingiva/surgery ; Humans ; Image Processing, Computer-Assisted ; Male ; Middle Aged ; Osseointegration/physiology ; Radiography, Bitewing ; Surgical Wound Dehiscence/complications ; Tooth Socket/surgery ; Wound Healing
Alveolar bone loss ; dental implants ; infection/prevention and control ; osseointegration ; plaque ; wound healing
BACKGROUND: The objective of this study was to evaluate the influence of early exposure of the cover screw on crestal bone loss around implants. METHODS: The study population consisted of 19 patients who were treated with dental implants placed using a two-stage surgical protocol and had early exposed and non-exposed implants (20 early exposed and 20 non-exposed implants). The crestal bone loss at exposed and non-exposed implants in each patient was evaluated with a periapical radiograph taken at the first surgery and at suprastructure insertion using a computerized image-analysis system. The bone loss was compared using the Wilcoxon signed-rank test. RESULTS: The mean crestal bone loss at exposed implants was 0.40 +/- 0.53 mm, and it was 0.18 +/- 0.26 mm at non-exposed implants. The Wilcoxon signed-rank test revealed a statistically significant difference in crestal bone loss between exposed and non-exposed implants in the same patient (P = 0.02). CONCLUSIONS: The early exposure of the cover screw that results in breakdown of the mucosal seal seems to accelerate early peri-implant crestal bone loss. Periodic follow-up after the first surgery may be critical for minimizing the influence of early exposure
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2. College of Dentistry (치과대학) > Dept. of Periodontics (치주과학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Oral and Maxillofacial Surgery (구강악안면외과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Chong Kwan(김종관)
Moon, Ik Sang(문익상)
Park, Kwang Ho(박광호) ORCID logo https://orcid.org/0000-0003-1942-2986
Lee, Dong Won(이동원) ORCID logo https://orcid.org/0000-0003-1852-7989
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