TY - JOUR
T1 - A modified protocol of mandibular osteoradionecrosis induction in rats with external beam radiation therapy
AU - Yamasaki, Mayra Cristina
AU - Roque-Torres, Gina Delia
AU - Peroni, Leonardo Vieira
AU - Nascimento, Eduarda Helena Leandro
AU - Salmon, Benjamin
AU - Oliveira, Matheus Lima
AU - Freitas, Deborah Queiroz
AU - Correr-Sobrinho, Lourenço
N1 - Publisher Copyright:
© 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Objective: To propose a modified protocol of mandibular osteoradionecrosis induction in rats with external beam radiation therapy. Material and methods: A total of 45 male Wistar rats were used in this study. Firstly, 25 rats were divided into 5 groups (n = 5) according to the radiation dose protocol: without irradiation and irradiated with 15 Gy, 20 Gy, 25 Gy, or 30 Gy using a linear accelerator. Secondly, 15 other rats were divided into 3 groups (n = 5) according to the time of extraction of the three right mandibular molars: 7, 10, or 14 days after irradiation of 20 Gy. Lastly, dental extractions were performed in 5 other rats without irradiation (C-E10) for comparison with those of the group of dental extractions 10 days after irradiation (I-E10). Results: The irradiated animals survived throughout the study period only at single doses of 15 Gy and 20 Gy. The suitable time for dental extractions after irradiation to induce mandibular osteoradionecrosis was defined as 10 days. Macroscopic evaluation of the right hemimandibles showed presence of osteoradionecrosis in I-E10 group and complete gingival healing in C-E10 group. Conclusion: A single radiation dose of 20 Gy focused on head and neck region combined with the extraction of the three mandibular molars 10 days after irradiation constitutes a feasible protocol of mandibular osteoradionecrosis induction in rats with external beam radiation therapy. Clinical relevance: Establishing a solid and widely available protocol of mandibular osteoradionecrosis induction is essential in the search for methods to prevent this complex disease.
AB - Objective: To propose a modified protocol of mandibular osteoradionecrosis induction in rats with external beam radiation therapy. Material and methods: A total of 45 male Wistar rats were used in this study. Firstly, 25 rats were divided into 5 groups (n = 5) according to the radiation dose protocol: without irradiation and irradiated with 15 Gy, 20 Gy, 25 Gy, or 30 Gy using a linear accelerator. Secondly, 15 other rats were divided into 3 groups (n = 5) according to the time of extraction of the three right mandibular molars: 7, 10, or 14 days after irradiation of 20 Gy. Lastly, dental extractions were performed in 5 other rats without irradiation (C-E10) for comparison with those of the group of dental extractions 10 days after irradiation (I-E10). Results: The irradiated animals survived throughout the study period only at single doses of 15 Gy and 20 Gy. The suitable time for dental extractions after irradiation to induce mandibular osteoradionecrosis was defined as 10 days. Macroscopic evaluation of the right hemimandibles showed presence of osteoradionecrosis in I-E10 group and complete gingival healing in C-E10 group. Conclusion: A single radiation dose of 20 Gy focused on head and neck region combined with the extraction of the three mandibular molars 10 days after irradiation constitutes a feasible protocol of mandibular osteoradionecrosis induction in rats with external beam radiation therapy. Clinical relevance: Establishing a solid and widely available protocol of mandibular osteoradionecrosis induction is essential in the search for methods to prevent this complex disease.
KW - Animal experimentation
KW - Osteoradionecrosis
KW - Radiotherapy
KW - X-ray microtomography
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U2 - 10.1007/s00784-019-03054-0
DO - 10.1007/s00784-019-03054-0
M3 - Article
C2 - 31401733
SN - 1432-6981
VL - 24
SP - 1561
EP - 1567
JO - Clinical Oral Investigations
JF - Clinical Oral Investigations
IS - 4
ER -