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Healing of surgically created circumferential gap around non-submerged-type implants in dogs: a histomorphometric study

 Ui-Won Jung  ;  Chang-Sung Kim  ;  Chong-Kwan Kim  ;  Takashi Inoue  ;  Kyoo-Sung Cho  ;  Seong-Ho Choi 
 CLINICAL ORAL IMPLANTS RESEARCH, Vol.18(2) : 171-178, 2007 
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OBJECTIVES: This study was conducted to evaluate the healing of surgically created circumferential gaps around non-submerged-type implants according to varying size and healing periods in dogs. MATERIAL AND METHODS: In four mongrel dogs, all mandible premolars were extracted and after an 8-week healing period, non-submerged-type implants were placed. Circumferential coronal defects around the implants were performed surgically with a customized tapered step drill. Groups were divided according to the width of the coronal gaps: 1, 1.5, or 2 mm. First the right side of the mandible was prepared, and after 8 weeks, the left side was prepared. The dogs were sacrificed following an 8-week healing period. Specimens were analyzed histologically and histomorphometrically. RESULTS: As the size of the coronal gap increased, the unfilled area tended to be greater. In terms of bone-to-implant contact and bone density, both the 1 and 1.5 mm groups showed a larger percentage of coronal defect than the apical side, while the 2 mm group showed contrary results in the 8-week groups. The general histologic features in the 16-week groups were similar to the findings of 8-week groups but were more matured, with a higher percentage of lamellar bone. A certain amount of bone filling and osseointegration was observed in the defects of all the groups. CONCLUSION: It can be concluded that the remaining defect, small enough to be clinically neglected, irrespective of gap size within 2 mm, does not need any kind of regenerating procedures.
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2. College of Dentistry (치과대학) > Dept. of Periodontics (치주과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Chong Kwan(김종관)
Kim, Chang Sung(김창성) ORCID logo https://orcid.org/0000-0003-3902-1071
Cho, Kyoo Sung(조규성) ORCID logo https://orcid.org/0000-0002-6777-5287
Choi, Seong Ho(최성호) ORCID logo https://orcid.org/0000-0001-6704-6124
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