Membrana reabsorvível com enxerto ósseo autógeno ou BoneCeramic em rebordos atróficos em implante de titânio: estudo histométrico em cães
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Data
2011-08-26
Autores
Hayacibara, Roberto Masayuki [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Propósito: O objetivo deste estudo foi avaliar histometricamente as alterações ósseas dimensionais, que ocorrem em rebordo atróficos induzidos experimentalmente, com a colocação de implante e enxerto ósseo autógeno ou grânulos de hidroxiapatita/fosfato β-tricálcio (BC) associados à membrana reabsorvível (MR). Materiais e Métodos: Defeitos ósseos foram criados após a extração dos 3 e 4 pré-molares mandibulares de cinco cães beagle. Após 3 meses, foram colocados 2 implantes em cada lado da mandíbula, dentro do rebordo atrófico, resultando em aproximadamente 6mm de superfície exposta do implante. Três grupos de tratamento foram distribuídos aleatoriamente: sem tratamento, MR + Osso autógeno (OA), MR + grânulos de hidroxiapatita/fosfato β-tricálcio. Após 4 meses, os cães foram sacrificados e foi realizada análise histométrica para avaliação de contato osso implante (COI) e ganho ósseo vertical (GOV). As médias de COI e GOV dos três grupos foram comparadas pelo teste de Tukey ao nível de significância de 5%. Resultados: Em 4 meses, o tratamento com MR+OA mostrou COI (%): 26.41 ± 4.90 e GOV (%): 16.06 ± 11.83. O grupo com MR+BC obteve COI (%): 15.16 ± 2.40 e GOV (%): 7.45 ± 9.84 e o grupo A mostrou COI (%): -0.23 ± 0.50 e GOV (%): -1.09 ± 8.99. O grupo MR+OA mostrou regeneração óssea maior (COI e GOV) que o grupo MR+BC e o grupo A (p<0.05). O grupo MR+BC obteve regeneração óssea maior (COI) que o grupo A (p<0.05). Conclusão: Concluiu-se que em rebordos atróficos: (i) tratamento com MR+OA aumenta a regeneração óssea, incluindo ganho ósseo vertical e contato osso implante; (ii) ocorre perda óssea na ausência de técnicas regenerativas
Purpose: The objective of this study was to evaluate histometric bone dimensional changes that occur in atrophics defects induced experimentally by placing the implant and autogenous bone graft or hydroxyapatite/β-tricalcium phosphate granules (BC) associated with reabsorbable membrane (RM). Material and Methods: A defect was created after the extraction of three four mandibular premolars of five beagle dogs. After 3 months, 2 implants were placed on each side of the mandible, within the atrophics defects, resulting in approximately 6 mm exposed surface of the implant. Three treatment groups were randomly assigned to: untreated control, RM + autogenous bone, RM + hydroxyapatite /β-tricalcium phosphate granules. After four months, the dogs were sacrificed and histometric analysis was performed to evaluate bone implant contact (BIC) and vertical bone gain (VBG). Mean BIC and VBG in the three groups were compared by Tukey test at a significance level of 5%. Results: In 4 months, treatment with RM + autogenous bone showed BIC (%): 26.41 ± 4.90 and VBG (%): 16.06 ± 11.83. The group RM + BC showed BIC (%): 15.16 ± 2.40 and VBG (%): 7.45 ± 9.84 and the A group obtained BIC (%): -0.23 ± 0.50 and VBG (%): - 1.09 ± 8.99. The RM + autogenous bone group showed greater bone regeneration (BIC and VBG) that RM + BC group and A group (p <0.05). The group received RM + BC greater bone regeneration (BIC) than the A group (p <0.05). Conclusion: We conclude that in atrophics defects: (i) RM + autogenous bone treatment increases bone regeneration, including vertical bone gain and bone implant contact, (ii) bone loss occurs in the absence of regenerative techniques
Purpose: The objective of this study was to evaluate histometric bone dimensional changes that occur in atrophics defects induced experimentally by placing the implant and autogenous bone graft or hydroxyapatite/β-tricalcium phosphate granules (BC) associated with reabsorbable membrane (RM). Material and Methods: A defect was created after the extraction of three four mandibular premolars of five beagle dogs. After 3 months, 2 implants were placed on each side of the mandible, within the atrophics defects, resulting in approximately 6 mm exposed surface of the implant. Three treatment groups were randomly assigned to: untreated control, RM + autogenous bone, RM + hydroxyapatite /β-tricalcium phosphate granules. After four months, the dogs were sacrificed and histometric analysis was performed to evaluate bone implant contact (BIC) and vertical bone gain (VBG). Mean BIC and VBG in the three groups were compared by Tukey test at a significance level of 5%. Results: In 4 months, treatment with RM + autogenous bone showed BIC (%): 26.41 ± 4.90 and VBG (%): 16.06 ± 11.83. The group RM + BC showed BIC (%): 15.16 ± 2.40 and VBG (%): 7.45 ± 9.84 and the A group obtained BIC (%): -0.23 ± 0.50 and VBG (%): - 1.09 ± 8.99. The RM + autogenous bone group showed greater bone regeneration (BIC and VBG) that RM + BC group and A group (p <0.05). The group received RM + BC greater bone regeneration (BIC) than the A group (p <0.05). Conclusion: We conclude that in atrophics defects: (i) RM + autogenous bone treatment increases bone regeneration, including vertical bone gain and bone implant contact, (ii) bone loss occurs in the absence of regenerative techniques
Descrição
Palavras-chave
Regeneração óssea guiada, Implantes dentários, Ossos - Enxerto, Guided bone regeneration, Dental implants, Bone-grafting
Como citar
HAYACIBARA, Roberto Masayuki. Membrana reabsorvível com enxerto ósseo autógeno ou BoneCeramic em rebordos atróficos em implante de titânio: estudo histométrico em cães. 2011. 49 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araçatuba, 2011.