Influence of premature exposure of implants on early crestal bone loss: an experimental study in dogs

Je Hyeon Yoo, Byung Ho Choi, Jingxu Li, Han Sung Kim, Chang Yong Ko, Feng Xuan, Seung Mi Jeong

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Objective: Several studies have reported on spontaneous early exposure of submerged implants, suggesting that exposed implants have greater bone loss than nonexposed implants. The purpose of this study was to compare the effects of implant-abutment connections and partial implant exposure on crestal bone loss around submerged implants. Study design: Bilateral, edentulated, flat alveolar ridges were created in the mandible of 6 mongrel dogs. After 3 months of healing, 2 fixtures were placed on each side of the mandible following a commonly accepted 2-stage surgical protocol. The fixtures on each side were randomly assigned to 1 of 2 procedures. In the first, a cover screw was connected to the fixture, and the incised gingiva was partially removed to expose the cover screw (partially exposed group). In the second, a healing abutment was connected to the fixture so that the coronal portion of the abutment remained exposed to the oral cavity (abutment-connected group). After 8 weeks, micro-computed tomography (micro-CT) at the implantation site was performed to measure the bone height in the peri-implant bone. Data were analyzed by Wilcoxon's signed rank test. Results: The average bone height was greater for the abutment-connected fixture (9.8 ± 0.5 mm) than for the partially exposed fixture (9.3 ± 0.5 mm; P < .05). Conclusion: These results suggest that when implant exposure is detected, the placement of healing abutments may help limit bone loss around the submerged implants.

Original languageEnglish
Pages (from-to)702-706
Number of pages5
JournalOral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology
Issue number6
Publication statusPublished - 2008 Jun

Bibliographical note

Funding Information:
This work was supported by Grant No. R13-2003-13 from the Medical Science and Engineering Research Program of the Korean Science & Engineering Foundation.

All Science Journal Classification (ASJC) codes

  • Surgery
  • Oral Surgery
  • Otorhinolaryngology
  • Dentistry(all)


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