Comparison of the skeletodental effects of miniscrew‐anchored and tooth‐anchored facemask treatment in growing patients with skeletal class III malocclusions

Abstract

AbstractIntroductionThis retrospective study aimed to evaluate the skeletal and dental effects of the miniscrew‐anchored facemask in skeletal Class III growing patients and compare them with those of conventional tooth‐anchored facemasks.MethodsRetrospectively a total of 50 patients with skeletal Class III (mean ANB: −1.12°) were investigated and divided into two groups according to the treatment modality. Twenty‐five patients were treated using the conventional tooth‐anchored facemask (T group: mean age 9.3 ± 1.1 years, mean ANB: −0.93°) whereas the other 25 were treated using a miniscrew‐anchored facemask (M group: mean age 9.7 ± 1.3 years. mean ANB: −1.61°). Two miniscrews were placed on the palate for bone anchorage. In both T and M groups, facemasks applied a force of 20–30° down on the occlusal plane, and the force increased from 200 g to 300–350 g per side throughout the treatments. The patients were instructed to wear facemasks for at least 14 h per day. A total of 16 angular and 11 linear cephalometric measurements were analysed to determine the skeletal and dental changes before and after facemask treatment. A paired t‐test was used to verify the effects before and after treatment in each group.ResultsAll miniscrews were well maintained during treatment. The values of SNA, SN‐ANS, ANB and A to N‐Perp, which indicate anterior protraction of the maxilla, were significantly higher in the M group compared with the T group (P < .05). Proclination of the maxillary incisors, extrusion and mesialization of the maxillary molars were significantly greater in the T group (P < .05).ConclusionsMiniscrew‐anchored facemask treatment increased the amount of maxillary protraction and reduced the dental side effects compared with conventional tooth‐anchored facemask treatment in growing patients with skeletal Class III malocclusion.