Collagen membranes at immediate implants: a histomorphometric study in dogs.
OBJECTIVE
To evaluate the influence of resorbable membranes on hard tissue alterations and osseointegration at implants placed into extraction sockets in a dog model.


METHODS
In the mandibular premolar region, implants were installed immediately into the extraction sockets of six Labrador dogs. Collagen-resorbable membranes were placed at the test sites, while the control sites were left uncovered. Implants were intended to heal in a submerged mode. After 4 months of healing, the animals were sacrificed, and ground sections were obtained for histomorphometric evaluation.


RESULTS
After 4 months of healing, a control implant was not integrated (n=5). Both at the test and at the control sites, bone resorption occurred. While the most coronal bone-to-implant contact was similar between the test and the control sites, the alveolar bone crest outline was maintained to a higher degree at the buccal aspect of the test sites (loss: 1.7 mm) compared with the control sites (loss: 2.2 mm).


CONCLUSIONS
The use of collagen-resorbable membranes at implants immediately placed into extraction sockets contributed to a partial (23%) preservation of the buccal outline of the alveolar process.
Caneva
Marco
M
UNESP - Faculty of Dentistry of Araçatuba, São Paulo State University, SP, Brazil.
Botticelli
Daniele
D
Salata
Luiz Antonio
LA
Scombatti Souza
Sérgio Luis
SL
Carvalho Cardoso
Leandro
L
Lang
Niklaus Peter
NP
D020341:Absorbable Implants; D016301:Alveolar Bone Loss / Q000145:classification / Q000473:pathology; D000539:Alveolar Process / Q000473:pathology; D000818:Animals; D001672:Biocompatible Materials; D003094:Collagen; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D004285:Dogs; D008334:Mandible / Q000473:pathology / Q000601:surgery*; D008567:Membranes, Artificial; D023421:Models, Animal; D016348:Osseointegration / Q000502:physiology; D013524:Surgical Flaps; D013529:Surgical Wound Dehiscence / Q000209:etiology; D014025:Titanium / Q000737:chemistry; D020390:Tooth Socket / Q000473:pathology / Q000601:surgery*; D014945:Wound Healing / Q000502:physiology; D015040:Zirconium / Q000737:chemistry
C106416:Bio-Gide; D001672:Biocompatible Materials; D015921:Dental Implants; D003764:Dental Materials; D008567:Membranes, Artificial; D003094:Collagen; D015040:Zirconium; D014025:Titanium