| The effects of corticotomy on bone mineral apposition rate (MAR) and BV/TV were investigated in 5 dogs during orthodontic tooth movement. One randomly selected mandibular quadrant had buccal and lingual corticotomies around the second premolar. Both maxillary quadrants had initial buccal corticotomies performed around the third premolar and one randomly selected quadrant had a second buccal corticotomy after 28 days. The teeth were moved into the extraction spaces over 8 week period with a continuous force of 200g. MAR and BV/TV were evaluated on undecalcified sections using Bioquant Osteo II system (Nashville, TN). There were no significant differences in MAR between the control and experimental sides in either the maxilla or the mandible. However, there was a trend of increased MAR after the corticotomies were performed. The maxilla showed a consistent, significant (p<.05) decrease of the BV/TV on the side with the second corticotomies. Differences in BV/TV associated with corticotomies were statistically significant in the mandibular alveolar process, but not in the mandibular buccal cortical bone. |
