International orthodontics · 2021
Acceleration of orthodontic tooth movement and root resorption with near and distant surgical insults: An in-vivo study on a rat model.
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Mehta Shivam, Chen Po-Jung, Kalajzic Zana, Ahmida Ahmad, Yadav Sumit
Аннотация
OBJECTIVE: The purpose of this study was to determine the effects of alveolar decortications (AD) closer and farther from the tooth on Orthodontic tooth movement (OTM) and root resorption.
MATERIALS AND METHODS: Twenty-four Wistar rats (age 17 weeks) were used in the study. Three groups were formed by randomly dividing the rats into: 1) Control Group (N=8): OTM (14 days) without any surgical insult; 2) Near Group (N=8) OTM (14 days)+Alveolar Decortications (AD) adjacent to roots of the maxillary first molar; 3) Far Group (N=8) OTM (14 days)+AD 5mm away from the roots of the maxillary first molar. OTM was performed using a closed coil Nickel-Titanium (NiTi) spring to apply a mesial force on maxillary first molars of 8-10 grams. AD was performed with high-speed quarter round bur on the palatal aspect of alveolar bone. The rats were euthanized after 2 weeks of OTM and microfocus computed tomography and histological analysis were performed.
RESULTS: Near-AD and Far-AD groups exhibited significantly increased OTM and reduction of Bone volume fraction compared to control. The root volume was significantly decreased (increased root resorption) in the Near-AD group. Histological analysis showed no statistically significant difference between the groups.
CONCLUSIONS: Alveolar decortications lead to a significant increase in the rate of OTM. Increased root resorption was observed when the alveolar decortications were performed close to the maxillary molar.
MATERIALS AND METHODS: Twenty-four Wistar rats (age 17 weeks) were used in the study. Three groups were formed by randomly dividing the rats into: 1) Control Group (N=8): OTM (14 days) without any surgical insult; 2) Near Group (N=8) OTM (14 days)+Alveolar Decortications (AD) adjacent to roots of the maxillary first molar; 3) Far Group (N=8) OTM (14 days)+AD 5mm away from the roots of the maxillary first molar. OTM was performed using a closed coil Nickel-Titanium (NiTi) spring to apply a mesial force on maxillary first molars of 8-10 grams. AD was performed with high-speed quarter round bur on the palatal aspect of alveolar bone. The rats were euthanized after 2 weeks of OTM and microfocus computed tomography and histological analysis were performed.
RESULTS: Near-AD and Far-AD groups exhibited significantly increased OTM and reduction of Bone volume fraction compared to control. The root volume was significantly decreased (increased root resorption) in the Near-AD group. Histological analysis showed no statistically significant difference between the groups.
CONCLUSIONS: Alveolar decortications lead to a significant increase in the rate of OTM. Increased root resorption was observed when the alveolar decortications were performed close to the maxillary molar.