Objective: this clinical study was designed to three dimensionally evaluate maxillary anterior teeth intrusion for treatment of anterior deep bite combined with Gummy Smile using TMA arch wire supported on two posterior miniscrews versus direct intrusion on two anterior miniscrews.
Materials and methods: A clinical trial was conducted on 20 deep bite and gummy smile patients, divided into two groups. Group A had two miniscrews inserted in between upper second premolars and upper first molars, while Group B had two miniscrews inserted in between upper canines and upper lateral incisors. In group A, 80 gm force was applied from the TMA intrusion arch to the anterior segment, while in group B, An equivalent magnitude of force was exerted by the use of an elastomeric chain, the measurement of intrusion was conducted utilizing CBCT.
Results: results showed significant decrease in intrusion measurements with mean difference in incisal edge to horizontal plane 2.72 ± 0.33mm for group A and 2.92 ± 0.17mm for group B. While with mean difference in apex to horizontal plane 2.61 ± 0.4mm for group A and 2.76 ± 0.31mm for group B.
Conclusion: The comparison between group A and group B showed no significant difference in intrusion measurements. As both groups used intrusion mechanics near to the center of resistance of the anterior segment and the same amount of force, allowing for similar intrusive effects.