Discussion
orthodontic movements, incisors
ROOT RESORPTION, ERUPTION
There is little published data on the effect of the corticotomy techniques on the acceleration of palatally impacted canine traction movement, even though these techniques have been shown to be effective in accelerating several orthodontic movements.
Our study findings showed that both the duration of active traction and the total treatment duration were significantly shorter in the CAT group compared to the TT group. In other words, the velocity of traction movement in the CAT group was significantly greater. This can be attributed to the fact that the corticotomy interventions decreased the cortical bone mass and its resistance to the impacted canine forced eruption movement due to its weakening by cortical cuts.
The results of the current study were in line with the previous studies that compared the acceleration and the conventional traction methods in terms of the incidence of acceleration but were inconsistent with those studies’ results regarding the amount of acceleration obtained. The mean traction movement velocity in the current study was greater (0.37 mm/wk.) than that of Fischer (0.26 mm/wk.).
In contrast, Ferguson et al.
This study showed that the posttreatment bone support ratios of the aligned canines did not differ significantly between the TT and CAT groups as well as when compared to the contralateral canines in both study groups. In addition, the results of the inter-group comparison showed that there were no significant differences in the mean bone support ratios of the adjacent lateral incisors and the first premolars. These results can be explained by the use of the same orthodontic traction techniques in both study groups, the use of light traction force in a direction that resembles the normal eruption path, and the fact that the amount of bone removed during surgical interventions was minimal. The results of the current study were in agreement with those of Fischer
No clinical trials have been published in the medical literature evaluating the level of bone support of the teeth adjacent to the PICs underwent corticotomy-assisted orthodontic treatment until now. Therefore, the results of the CAT group in the current work cannot be compared with others due to the lack of similar studies.The mean amount of root resorption of the adjacent laterals was almost similar in the two study groups with no significant differences. The light traction force used and its direction that from the beginning of its application was away from the root of the lateral incisors, could explain the presence of the low percentage and mild degree of root resorption of the adjacent laterals. Due to the lack of similar studies, the results obtained in the current study are only compared with the results of studies that used the traditional traction methods.The results of the current study were consistent with those of Arriola-Guillén
