Vertical alveolar crest bone maintenance around implants in two-stage surgery: an in situ study in dogs.
The aim of this study was to evaluate in situ changes in the alveolar crest bone height around immediate implant-supported crowns in comparison to tooth-supported crowns (control) with the cervical margins located at the bone crest level, without occlusal load. In Group I, after extraction of 12 mandibular premolars from 4 adult dogs, implants from Branemark System (MK III TiU RP 4.0 x 11.5 mm) were placed to retain complete acrylic crowns. In Group II, premolars were prepared to receive complete metal crowns. Sixteen weeks after placement of the crowns (38 weeks after tooth extraction), the height of the alveolar bone crest was measured with a digital caliper. Data were analyzed statistically by the Mann-Whitney test at 5% significance level. The in situ analysis showed no statistically significant difference (p=0.880) between the implant-supported and the tooth-supported groups (1.528 + 0.459 mm and 1.570 + 0.263 mm, respectively). Based on the findings of the present study, it may be concluded that initial peri-implant bone loss may result from the remodeling process necessary to establish the biological space, similar to which occurs with tooth-supported crowns.
Department of Pediatric Clinics, Preventive and Community Dentistry, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
Mário Roberto
MR
Leonardo
Alberto Tadeu Nascimento
AT
Borges
Walter
W
Martins-Júnior
Alexandra Mussolino
AM
de Queiroz
Sada
S
Assed
D000539:Alveolar Process / Q000473:pathology*; D000818:Animals; D001641:Bicuspid / Q000601:surgery; D002484:Cementation; D002508:Cephalometry; D003442:Crowns; D000044:Dental Abutments; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D004285:Dogs; D006047:Gold Alloys; D008334:Mandible / Q000601:surgery; D016348:Osseointegration / Q000502:physiology; D016300:Radiography, Bitewing; D011897:Random Allocation; D014081:Tooth Extraction; D019231:Tooth Preparation, Prosthodontic; D020390:Tooth Socket / Q000601:surgery; D016896:Treatment Outcome; D015036:Zinc Phosphate Cement
D015921:Dental Implants; D006047:Gold Alloys; D015036:Zinc Phosphate Cement