Immediate implant placement in conjunction with guided bone regeneration and/or connective tissue grafts: an experimental study in canines
임현창, 팽경원, 김명지, Jung Ronald E., Hammerle Christoph HF., 정의원, Thoma Daniel S.,
소속 상세정보
임현창 ( Lim Hyun-Chang ) - Kyung Hee University School of Dentistry Department of Periodontology
팽경원 ( Paeng Kyeong-Won ) - Yonsei University College of Dentistry Department of Periodontology
김명지 ( Kim Myong-Ji ) - Yonsei University College of Dentistry Department of Periodontology
( Jung Ronald E. ) - University of Zurich Center of Dental Medicine Clinic of Reconstructive Dentistry
( Hammerle Christoph HF. ) - University of Zurich Center of Dental Medicine Clinic of Reconstructive Dentistry
정의원 ( Jung Ui-Won ) - Yonsei University College of Dentistry Department of Periodontology
( Thoma Daniel S. ) - University of Zurich Center of Dental Medicine Clinic of Reconstructive Dentistry
Abstract
Purpose: This study was conducted to assess the effect of hard and/or soft tissue grafting on immediate implants in a preclinical model.
Methods: In 5 mongrel dogs, the distal roots of P2 and P3 were extracted from the maxilla (4 sites in each animal), and immediate implant placement was performed. Each site was randomly assigned to 1 of the following 4 groups: i) gap filling with guided bone regeneration (the GBR group), ii) subepithelial connective tissue grafting (the SCTG group), iii) GBR and SCTG (the GBR/SCTG group), and iv) no further treatment (control). Non-submerged healing was provided for 4 months. Histological and histomorphometric analyses were performed.
Results: Peri-implant tissue height and thickness favored the SCTG group (height of periimplant mucosa: 1.14 mm; tissue thickness at the implant shoulder and ±1 mm from the shoulder: 1.14 mm, 0.78 mm, and 1.57 mm, respectively; median value) over the other groups.
Bone grafting was not effective at the level of the implant shoulder and on the coronal level of the shoulder. In addition, simultaneous soft and hard tissue augmentation (the GBR/SCTG group) led to a less favorable tissue contour compared to GBR or SCTG alone (height of periimplant mucosa: 3.06 mm; thickness of peri-implant mucosa at the implant shoulder and ±1 mm from the shoulder: 0.72 mm, 0.3 mm, and 1.09 mm, respectively).
Conclusion: SCTG tended to have positive effects on the thickness and height of the periimplant mucosa in immediate implant placement. However, simultaneous soft and hard tissue augmentation might not allow a satisfactory tissue contour in cases where the relationship between implant position and neighboring bone housing is unfavorable.
키워드
Alveolar ridge augmentation; Animal experimentation; Dental implantation
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