Mariana Raquel da Cruz Vegian1, Bruno César Almeida Costa2, Gabriela de Fátima Santana-Melo2, Fernanda Herrera Costa Godoi2, Estela Kaminagakura2, Rubens Nisie Tango3, Renata Falchete do Prado2, Luciane Dias de Oliveira2, Claudio Antonio Federico4, Sarah de Oliveira Marco Avelino5, Rafael Marques Neves2, Luana Marotta Reis de Vasconcellos6. 1. Department of Bioscience and Oral Diagnosis, Institute of Science and Technology of São José dos Campos, Sao Paulo State University (Unesp), Av. Engenheiro Francisco José Longo, 777, Sao Jose dos Campos, Sao Paulo, 12245-000, Brazil. mariana.vegian@unesp.br. 2. Department of Bioscience and Oral Diagnosis, Institute of Science and Technology of São José dos Campos, Sao Paulo State University (Unesp), Av. Engenheiro Francisco José Longo, 777, Sao Jose dos Campos, Sao Paulo, 12245-000, Brazil. 3. Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, Sao Paulo State University (Unesp), Sao Jose dos Campos, SP, Brazil. 4. Department of Aerospace Science and Technology, Institute of Advanced Studies, Technological Institute of Aeronautics, Sao Jose dos Campos, SP, Brazil. 5. Graduated student of Institute of Science and Technology of São José dos Campos, Sao Paulo State University (Unesp), Sao Jose dos Campos, SP, Brazil. 6. Department of Bioscience and Oral Diagnosis, Institute of Science and Technology of São José dos Campos, Sao Paulo State University (Unesp), Av. Engenheiro Francisco José Longo, 777, Sao Jose dos Campos, Sao Paulo, 12245-000, Brazil. luanamrv@gmail.com.
Abstract
OBJECTIVES: Evaluate the modulating effect of ionizing radiation, blood cytokine levels, and bone remodeling of the interface around the implant to understand the radiation mechanisms which can impair the implants receptor site. MATERIAL AND METHODS: Sixty rats were submitted to grade V titanium implants in the femurs and were divided into the following groups: no-irradiation (N-Ir): control group with implant only; early-irradiation (E-Ir): implant + irradiation after 24 h; late-irradiation (L-Ir): implant + irradiation after 4 weeks; and previous-irradiation (P-Ir): irradiation + implant after 4 weeks. The animals in the E-Ir, L-Ir, and P-Ir groups were irradiated in two fractional stages of 15 Gy. At 3 days, 2 weeks, and 7 weeks after the final procedure, five animals were randomly euthanized per group. Serum levels of TNF-ɑ, IL-1β, TGF-β, IL-6, M-CSF, and IL-10 were measured from blood collected prior to euthanasia using the ELISA test. The pieces containing the implants were subjected to immunohistochemical labeling using the tartrate acid resistant to phosphatase, osteocalcin, and caspase-3 markers and mCT. The ANOVA test was used for statistical analysis, and the Tukey multiple comparison test (p < 0.05) was applied. RESULTS: The results indicated that ionizing radiation modifies the production of pro- and anti-inflammatory serum cytokines, the expression of proteins involved in bone remodeling and cellular apoptosis, as well as changes in bone formation. CONCLUSIONS: The results suggests that a longer period between radiotherapy and implant placement surgery when irradiation occurs prior to implant installation would allow the recovery and renewal of bone cells and avoid future failures in osseointegration. CLINICAL RELEVANCE: The search for modifications caused by ionizing irradiation in bone tissue can indicate the ideal period for implant placement without affecting the osseointegration process.
OBJECTIVES: Evaluate the modulating effect of ionizing radiation, blood cytokine levels, and bone remodeling of the interface around the implant to understand the radiation mechanisms which can impair the implants receptor site. MATERIAL AND METHODS: Sixty rats were submitted to grade V titanium implants in the femurs and were divided into the following groups: no-irradiation (N-Ir): control group with implant only; early-irradiation (E-Ir): implant + irradiation after 24 h; late-irradiation (L-Ir): implant + irradiation after 4 weeks; and previous-irradiation (P-Ir): irradiation + implant after 4 weeks. The animals in the E-Ir, L-Ir, and P-Ir groups were irradiated in two fractional stages of 15 Gy. At 3 days, 2 weeks, and 7 weeks after the final procedure, five animals were randomly euthanized per group. Serum levels of TNF-ɑ, IL-1β, TGF-β, IL-6, M-CSF, and IL-10 were measured from blood collected prior to euthanasia using the ELISA test. The pieces containing the implants were subjected to immunohistochemical labeling using the tartrate acid resistant to phosphatase, osteocalcin, and caspase-3 markers and mCT. The ANOVA test was used for statistical analysis, and the Tukey multiple comparison test (p < 0.05) was applied. RESULTS: The results indicated that ionizing radiation modifies the production of pro- and anti-inflammatory serum cytokines, the expression of proteins involved in bone remodeling and cellular apoptosis, as well as changes in bone formation. CONCLUSIONS: The results suggests that a longer period between radiotherapy and implant placement surgery when irradiation occurs prior to implant installation would allow the recovery and renewal of bone cells and avoid future failures in osseointegration. CLINICAL RELEVANCE: The search for modifications caused by ionizing irradiation in bone tissue can indicate the ideal period for implant placement without affecting the osseointegration process.
Entities:
Keywords:
Bone remodeling; Cytokines; Immunohistochemistry; Radiotherapy; Titanium implants
Authors: M Brasseur; V Brogniez; V Grégoire; H Reychler; B Lengelé; W D'Hoore; C Nyssen-Behets Journal: Int J Oral Maxillofac Surg Date: 2006-05-11 Impact factor: 2.789