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Previous issue date: 2012-05-17 / Objective: As the use of bone allografts in oral rehabilitation has increased, this study evaluated the effect of non-ablative laser on bone apposition when ground bone allografts are used. Studies in the literature show that the application of low-level laser therapy (LLLT) promotes tissue repair and new bone formation. Material and Methods: Four rabbits were used as bone donors, and ground bone allografts and autografts were implanted in the skull of 20 rabbits divided into four groups: two LLLT groups (allograft, autograft and blood clot), and two control groups (allograft, autograft and blood clot) that did not receive LLLT. The animals were killed at 35 (n=10) and 70 (n=10) days. Laser parameters were: laser diode application (GaAlAs), wavelength of 830 nm of 4 J/cm2 at four points in the skullcap at a total of 16 J/cm2 per application. Total treatment dose after eight applications was 128 J/cm2. Results: There was an increase in the apposition of collagen fibers, bone remodeling and vascularization, and there was less inflammatory infiltrate in the LLLT groups that received allografts at 35 days than in the allograft control group. At 70 days there was greater collagen fiber apposition, greater density of osteocytes lacunae, and a statistically significant difference in bone remodeling and vascularization when compared with the allograft control group. In the LLT autograft groups, there was also greater density of osteocytes lacunae, greater apposition of collagen fibers and greater bone remodeling at 35 and 70 days. Conclusion: Evaluation under light microscopy and SEM revealed a positive qualitative and quantitative effect of LLLT, which accelerated osteogenesis and the incorporation and remodeling of ground bone allografts and autografts / Objetivo: devido ao aumento da utiliza??o de aloenxertos ?sseos nas reabilita??es orais avaliou-se o efeito do laser n?o ablativo no processo de incorpora??o ?ssea de aloenxertos triturados. As pesquisas publicadas demonstram que aplica??o da laserterapia n?o ablativa (LLLT) apresenta vantagens no reparo tecidual e no processo de neoforma??o ?ssea. Materiais e M?todos: foram utilizados quatro coelhos como doadores do tecido ?sseo e realizados aloenxertos e autoenxertos triturados na calv?ria de 20 coelhos divididos em quatro grupos: dois grupos com LLLT (aloenxerto, autoenxerto e co?gulo sangu?neo) e outros dois grupos controle (aloenxerto, autoenxerto e co?gulo sangu?neo) sem irradia??o. Os animais foram mortos com 35 dias (n=10) e 70 dias (n=10). Os par?metros de energia empregados foram: aplica??o de laser de diodo (AsGaAl), comprimento de onda de 830 nm de 4 J/cm2 em quatro pontos da calota craniana perfazendo um total de 16 J/cm2 por aplica??o. A dose total do tratamento ap?s as oito aplica??es foi de 128 J/cm2. Resultados: houve um aumento da deposi??o de fibras col?genas, da remodela??o ?ssea, vasculariza??o e um menor infiltrado inflamat?rio nos grupos irradiados nos aloenxertos aos 35 dias quando comparado ao grupo controle al?geno. Aos 70 dias houve uma maior deposi??o de fibras col?genas e maior preenchimento das lacunas osteoc?ticas e foi observado diferen?a estat?stica significante na remodela??o ?ssea e na vasculariza??o quando comparado ao grupo controle al?geno. Os grupos de autoenxerto com LLLT apresentaram maior preenchimento das lacunas osteoc?ticas, maior deposi??o de fibras col?genas e maior remodela??o ?ssea aos 35 e 70 dias. Conclus?o: Observou-se atrav?s da Microscopia ?ptica e de MEV um efeito positivo qualitativo e quantitativo da LLLT, acelerando o processo de osteog?nese, incorpora??o e remodela??o de aloenxertos e autoenxertos ?sseos triturados
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/1176 |
| Date | 17 May 2012 |
| Creators | Paes, Jefferson Viapiana |
| Contributors | Oliveira, Mar?lia Gerhardt de |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, BR, Faculdade de Odontologia |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 600, 4673435736271820140 |
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