AIM: To study osseointegration and bone-level changes at implants installed using either a standard or a reduced diameter bur for implant bed preparation. MATERIAL AND 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.
AIM: To study osseointegration and bone-level changes at implants installed using either a standard or a reduced diameter bur for implant bed preparation. MATERIAL AND 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.
Authors: Bernardo Ferreira Lemos; Paula Lopez-Jarana; Carlos Falcao; Blanca Ríos-Carrasco; Javier Gil; José Vicente Ríos-Santos; Mariano Herrero-Climent Journal: Int J Environ Res Public Health Date: 2020-12-02 Impact factor: 3.390
Authors: Rafael Coutinho Mello-Machado; Suelen Cristina Sartoretto; Jose Mauro Granjeiro; José de Albuquerque Calasans-Maia; Marcelo Jose Pinheiro Guedes de Uzeda; Carlos Fernando de Almeida Barros Mourão; Bruna Ghiraldini; Fabio Jose Barbosa Bezerra; Plinio Mendes Senna; Mônica Diuana Calasans-Maia Journal: Sci Rep Date: 2021-07-29 Impact factor: 4.379