Influence of interimplant distance on gingival papilla formation and bone resorption: clinical-radiographic study in dogs.
OBJECTIVE
The purpose of this study was to evaluate in dogs the area between implants after prosthetic restoration within 5 mm distance between the contact point (CP) between crowns and the bone crest (BC).


METHODS
The mandibular premolars of 6 dogs were extracted bilaterally. After 12 weeks of healing, each dog received 8 implants. On each side, 2 implants were separated by 2 mm (group 1) and 2 by 3 mm (group 2). After a healing period (3 months), the implants were restored with temporary acrylic resin prostheses and after 4 more weeks, with definitive metallic prostheses. After 8 weeks, the distance between the CP and the papilla (P) was measured. The distance between a line extending from the CP and the gingival height at the distal extension of the prosthesis (DE) was also measured. Digital radiographic images were obtained for evaluation of the CP-BC and BC-P distances and the analysis of bone resorption adjacent to the implant surfaces.


RESULTS
The median CP-P distances were 1.75 mm and 1.98 mm for groups 1 and 2, respectively; the median CP-DE distances were 2.60 and 2.69, respectively. The mean CP-BC distances were 5.64 mm and 6.45 mm, for groups 1 and 2, respectively; mean BC-P distances were 3.07 mm and 3.55 mm, respectively.


CONCLUSIONS
The differences in distances of 2 and 3 mm between implants did not present significant differences in the formation of papillae or in crestal resorption. The CP-BC distances for prostheses should be different from those of natural teeth because in natural teeth, the biologic width is already present, and in the case of implant-supported prostheses, it will develop following second-stage surgery.
Novaes
Arthur B
AB
Department of Buco-Maxillofacial Surgery and Traumatology and Periodontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil. novaesjr@forp.usp.br
Papalexiou
Vula
V
Muglia
Valdir
V
Taba
Mário
M
D000818:Animals; D001862:Bone Resorption / Q000000981:diagnostic imaging; D003758:Dental Implantation, Endosseous / Q000009:adverse effects* / Q000379:methods; D015921:Dental Implants / Q000009:adverse effects*; D003771:Dental Papilla / Q000033:anatomy & histology* / Q000254:growth & development; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods; D004285:Dogs; D008297:Male; D019252:Radiography, Dental, Digital
D015921:Dental Implants