Effect of clear aligner therapy on the buccolingual inclination

Effect of clear aligner therapy on the buccolingual inclination

To compare the changes in the buccolingual inclination of mandibular canines and intercanine distance in patients treated with clear aligners to those treated with pre-adjusted edgewise appliances.

The buccolingual inclination of mandibular canines and the intercanine distance were measured on pre-and post-treatment cone-beam computed tomograms of 30 patients who had been treated with Clear aligner Johor Bahru  and 30 patients who had been treated with fixed pre-adjusted edgewise appliances. Differences between the aligner and fixed appliance groups and between pre-and post-treatment measurements were tested for statistical significance.

In both groups, most of the mandibular canines had positive buccolingual inclinations (ie, their crowns were positioned lateral to their roots) both before and after treatment. While there was no difference between the group’s pretreatment, the posttreatment buccolingual inclination was significantly greater in the aligner group. In the fixed appliance group, the canines became more upright with treatment, while the buccolingual inclination did not change significantly in the clear aligner group.

The intercanine distance did not differ between the groups either before or after treatment. However, it increased significantly over the course of treatment in the aligner group, whereas it did not change significantly in the fixed appliance group.

Orthodontic treatment with clear aligners tends to increase the mandibular intercanine distance with little change in inclination in contrast to treatment with fixed appliances, which leaves the intercanine distance unchanged but leads to more upright mandibular canines.

Among the various clear aligner treatment modalities available to orthodontists today, Invisalign® is one of the most widely recognized. Developed by Align Technology Inc in the late 1990s, Invisalign uses three-dimensional (3-D) technology to create a series of aligners to move teeth. Advantages of aligner therapy have been suggested to include improved oral hygiene and periodontal health, superior esthetics, high patient acceptance, and flexibility in terms of their ability to be used in combination with other orthodontic treatment modalities.

 Disadvantages of aligner therapy have been reported to include limited control of root movement and intermaxillary correction, inability to alter the course of treatment once aligners are fabricated, limited treatment success with more complex cases, and reliance on patient compliance for treatment success.

While the efficacy of aligner therapy is well documented,  objective evidence of its treatment effects is limited. In an effort to gain more knowledge about the clinical effects of aligner therapy, the present study measured its effects on the buccolingual inclination and intercanine distance of mandibular canines compared to those of pre-adjusted edgewise appliances.

The buccolingual inclination of teeth influences factors such as anterior and canine guidance, adequate intercuspation, and the absence of occlusal interferences. Moreover, buccolingual tooth inclinations are related to dental and periodontal features such as wear patterns and gingival recession, respectively. 

Therefore, the ability to obtain standardized measurements of the buccolingual inclinations of teeth together with the quantification of changes in these inclinations resulting from orthodontic treatment is of significant interest. With their single, long roots, mandibular canines are relatively easy to measure and, more importantly, are of special interest as a result of their location, their role in resolving incisor crowding, and their importance in achieving canine guidance.

Leave a Reply

Your email address will not be published. Required fields are marked *