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http://dx.doi.org/10.14368/jdras.2013.29.2.175

Early Marginal Bone Loss around Submerged Implants According to the Patterns of Cover Screw Exposures  

Choi, Mee-Ra (Department of Prosthodontics, College of Medicine, Hallym University)
Park, Chan-Jin (Department of Prosthodontics and Research Institute of Oral Science, Gangneung-Wonju National University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.29, no.2, 2013 , pp. 175-182 More about this Journal
Abstract
The purpose of this study was to observe and analyze the initial marginal bone resorption changes according to the patterns of cover screw exposures during healing period followed by implants installation. Total 64 fixtures(TiUniteTM, NobelBiocare, Sweden) were installed in partially edentulous jaws of 28 patients, who were selected retrospectively and were shown at least one cover screw exposure. Cover screw exposures were defined at 1 month recall. According to the patterns of exposures, groups were categorized into group 1 (No exposure), group 2 (pin-point exposure), group 3 (less than 1/2 of cover screw), group 4 (more than 1/2 of cover screw), group 5 (total exposure). Periapical radiographs were taken in purpose of changes of marginal bone level between installation and 2 month recall. Healing abutments were secured on the exposure groups at 2 month recall. Results were as follows: 1. Marginal bone resorptions were identified whenever cover screws were exposed. 2. Group 2 and 3 were shown significantly increased bone loss more than other group (P <.05). 3. Group 4 and 5 were shown significantly increased bone loss more than group 1, however, less than other groups ( P <.05). Conclusionally, cover screw exposure may cause marginal bone resorptions, therefore, early connection of healing abutment is clinically helpful.
Keywords
implant; cover screw exposure; early marginal bone loss;
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