IADR Abstract Archives
Effect Of Submandibulectomy On Interradicular Bone Of Rats Undergoing Tooth Movement
Objectives: To assess the effect of SMx on interradicular bone and periodontal ligament (LP) in two stages of orthodontic tooth movement (O).
Methods: 24 adult male Wistar rats were divided into 4 groups: Control (C) and Orthodontic (O), both subbmited to Sham and SMx, which were performed 7 days before T0. At T0, O was induced by a NiTi spring attached from the right upper 1st molar (1M) to the upper incisors, and euthanasia took place 48hs and 7 days after. Microcomputed tomography scans were taken to determine the microarchitecture of the cervical half of the interradicular bone of the 1M by analizing: bone volume (BVp), trabecular thickness (Tb.Th), intertrabecular distance (Tb.Sp), number of trabeculae (Tb.N) and LP space. Statistical analysis was performed by Student t test and statistical difference was considered when p<0.05.
Results: At 48hs BVp was lower in C+SMx (1,22±0,02) and in O (1,13±0,03) vs C (1,3±0,04). Also O+SMx (0,9±0,02) was lower vs C+SMx and vs O. Tb.Th was lower in O+SMx (125,4±3,07), vs O (142,7±1,31) and vs C+SMx (158,1±1,83). LP space was higher in O+SMx (120±4,17) vs C+SMx (81,94±3,59). At day 7, BVp was lower in C+SMx (1,13±0,03) and O (1,12±0,02), vs C (1,35±0,04). Also O+SMx (0,71±0,03) was lower vs C+SMx and vs O. Tb.Th was lower in O+SMx (121,6±2,86), vs O (161,9±5,05) and vs C+SMx (159±1,95). Tb.Sp was increased in O+SMx (180,1±2,03) vs O (167,9±5,5). LP space was higher in O (183,7±3,87) vs O+SMx (149,1±5,11).
Conclusions: Submandibulectomy exacerbates the effects induced by orthodontics on the interradicular bone. In the first stage, the decrease in bone volume can be seen as lower trabecular thickness and increased LP space. In longer periods of time, it would also increase the medular space between trabeculae.
Methods: 24 adult male Wistar rats were divided into 4 groups: Control (C) and Orthodontic (O), both subbmited to Sham and SMx, which were performed 7 days before T0. At T0, O was induced by a NiTi spring attached from the right upper 1st molar (1M) to the upper incisors, and euthanasia took place 48hs and 7 days after. Microcomputed tomography scans were taken to determine the microarchitecture of the cervical half of the interradicular bone of the 1M by analizing: bone volume (BVp), trabecular thickness (Tb.Th), intertrabecular distance (Tb.Sp), number of trabeculae (Tb.N) and LP space. Statistical analysis was performed by Student t test and statistical difference was considered when p<0.05.
Results: At 48hs BVp was lower in C+SMx (1,22±0,02) and in O (1,13±0,03) vs C (1,3±0,04). Also O+SMx (0,9±0,02) was lower vs C+SMx and vs O. Tb.Th was lower in O+SMx (125,4±3,07), vs O (142,7±1,31) and vs C+SMx (158,1±1,83). LP space was higher in O+SMx (120±4,17) vs C+SMx (81,94±3,59). At day 7, BVp was lower in C+SMx (1,13±0,03) and O (1,12±0,02), vs C (1,35±0,04). Also O+SMx (0,71±0,03) was lower vs C+SMx and vs O. Tb.Th was lower in O+SMx (121,6±2,86), vs O (161,9±5,05) and vs C+SMx (159±1,95). Tb.Sp was increased in O+SMx (180,1±2,03) vs O (167,9±5,5). LP space was higher in O (183,7±3,87) vs O+SMx (149,1±5,11).
Conclusions: Submandibulectomy exacerbates the effects induced by orthodontics on the interradicular bone. In the first stage, the decrease in bone volume can be seen as lower trabecular thickness and increased LP space. In longer periods of time, it would also increase the medular space between trabeculae.