Influence of lateral pressure to the implant bed on osseointegration: an experimental study in dogs.
OBJECTIVE
To study osseointegration and bone-level changes at implants installed using either a standard or a reduced diameter bur for implant bed preparation.


METHODS
In six Labrador dogs, the first and second premolars were extracted bilaterally. Subsequently, mesial roots of the first molars were endodontically treated and distal roots, including the corresponding part of the crown, were extracted. After 3 months of healing, flaps were elevated and recipient sites were prepared in all experimental sites. The control site was prepared using a standard procedure, while the test site was prepared using a drill with a 0.2 mm reduced diameter than the standard one used in the contra-lateral side. After 4 months of healing, the animals were euthanized and biopsies were obtained for histological processing and evaluation.


RESULTS
With the exception of one implant that was lost, all implants were integrated in mineralized bone. The alveolar crest underwent resorption at control as well as at test sites (buccal aspect ∼1 mm). The most coronal contact of bone-to-implant was located between 1.2 and 1.6 mm at the test and between 1.3 and 1.7 mm at the control sites. Bone-to-implant contact percentage was between 49% and 67%. No statistically significant differences were found for any of the outcome variables.


CONCLUSIONS
After 4 months of healing, lateral pressure to the implant bed as reflected by higher insertion torques (36 vs. 15 Ncm in the premolar and 19 vs. 7 Ncm in the molar regions) did not affect the bone-to-implant contact.
Pantani
Fabio
F
Faculty of Dentistry of Araçatuba, UNESP - São Paulo State University, São Paulo, Brazil.
Botticelli
Daniele
D
Garcia
Idelmo Rangel
IR
Salata
Luiz Antonio
LA
Borges
Germana Jayme
GJ
Lang
Niklaus P
NP
D000818:Animals; D001641:Bicuspid; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D004285:Dogs; D020007:Implants, Experimental; D008334:Mandible / Q000601:surgery; D008963:Molar; D016348:Osseointegration / Q000502:physiology*; D010784:Photomicrography; D011312:Pressure; D020390:Tooth Socket / Q000601:surgery; D019415:Torque; D014945:Wound Healing / Q000502:physiology
D015921:Dental Implants