Avaliação comparativa da viabilidade celular imediata após osteotomia para implantes com fresas e piezocirurgia em tíbias de coelhos: análise imunoistoquímica

2010 
O proposito desse trabalho foi avaliar o efeito da osteotomia para implantes sobre a viabilidade celular ossea imediata, comparando a utilizacao de fresas do sistema convencional com a piezocirurgia em tibias de coelhos. Foram utilizados 6 coelhos machos, divididos em 2 etapas: (1) Fresas u 5 grupos (G1 a G5) correspondentes as osteotomias 10, 20, 30, 40 e 50 vezes, respectivamente. Cada leito osseo recebeu a sequencia de fresas: lanca e helicoidais de 2,0 mm, 2,8 mm, 3,0 mm e 3,15 mm; (2) Piezocirurgia u 5 grupos (P1 a P5) correspondentes as osteotomias 10, 20, 30, 40 e 50 vezes, respectivamente, efetuadas pela sequencia de pontas de 2,0 e 3,0 mm, mediante vibracao ultrassonica piezoeletrica. As areas osteotomizadas foram coletadas e processadas laboratorialmente. A analise imunoistoquimica demonstrou equilibrio das expressoes de OPG e RANKL, ou seja, formacao e reabsorcao ossea, tanto nas osteotomias com fresas, quanto na piezocirurgia, embora mais intensas nesta ultima. A expressao de OC apresentou-se bastante intensa nos grupos de piezocirurgia, mas com reducao da imunomarcacao a partir da 30a osteotomia, enquanto manteve-se constante nos grupos fresados. A CAS3 evidenciou a viabilidade osteoblastica a partir da 20a osteotomia com piezocirurgia e manteve-se constante ate a 50a. No grupo de fresas, notou-se aumento gradativo da expressao dessa proteina, conforme o aumento do numero de osteotomias. De acordo com a metodologia aplicada, foi possivel concluir que a piezocirurgia propicia maior viabilidade celular osteoblastica do que o sistema de fresas convencional(AU) The purpose of this study was to evaluate the effect of the osteotomy implant on bone cell viability immediately, comparing the use of conventional drilling system with piezosurgeryri in tibiae of rabbits. We used 6 male rabbits were divided into 2 stages: (1) Drilling - 5 groups (G1 to G5) corresponding to the 10 osteotomies, 20, 30, 40 and 50 times respectively. Each received a bone bed following drills: Spear drill and 2.0 mm, 2.8 mm, 3.0 mm and 3.15 mm helicoidal drills, (2) Piezosurgeryri - 5 groups (P1 to P5) corresponding to the 10 osteotomies, 20, 30, 40 and 50 times, respectively, analyzed by the sequence of inserts 2 and 3 mm by piezoelectric ultrasonic vibration. The receptor-beds were collected and processed in a laboratory. The immunohistochemical analysis showed balance expressions of OPG and RANKL, ie bone formation and resorption in both the osteotomies with drills and piezosurgeryri, although more intense in the latter. The expression of OC had become quite intense in piezosurgeryri groups, but with reduced immunostaining from the 30th osteotomy, while remained unchanged in groups drilled. The CAS3 showed the viability of the osteoblast from the 20th osteotomy with piezosurgeryri and remained constant until the 50th. In the group of drills noticed a gradual increase in the expression of this protein, as the increase in the number of osteotomies. According to the methodology, it was concluded that the piezosurgeryri provides greater osteoblastic cell viability than the system of conventional drilling(AU)
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