Effect of gender and Frankfort mandibular plane angle on orthodontic space closure: a randomized controlled trial

Abstract

Structured Abstract Objectives To determine the effect of gender and Frankfort mandibular plane angle (FMPA) on extraction space closure. Setting and Sample Population A single district general hospital. The sample population were 11‐ to 18‐year‐olds undergoing upper and lower fixed appliance therapy following the loss of a premolar in each quadrant. Methods A total of 100 patients undergoing upper and lower fixed appliance therapy following the loss of four premolars were randomized with stratification on two age ranges (11–14 years and 15–18 years) and three FMPAs (high, medium and low). Allocation was to one of three treatment groups: conventional, active or passive self‐ligating brackets, with an allocation ratio of 1:2:2. All subjects were treated using the same archwire sequence and space closing mechanics. Space closure was measured on models taken every 12 weeks throughout treatment. All measurements were taken by one operator, blinded to bracket type. Results A total of 98 patients were followed to completion. Data were analysed using linear mixed models and demonstrated no statistically significant difference between bracket types with respect to space closure. Therefore, the data were pooled to determine the effect of gender and FMPA on space closure. At all stages of space closure, there was a significant effect of gender (results are presented as effect size, lower and upper 95% confidence intervals and probability), that is passive [1.064, 0.521, 1.607, 0.001], active [0.825, 0.312, 1.339, 0.002] and total space closure [1.029, 0.527, 1.531, 0.001]. There was no statistically significant effect of FMPA on space closure. Conclusions Space closure during fixed appliance therapy is affected by gender but is unaffected by FMPA.

The effect of conventional versus figure-of-eight module ligation on mandibular incisor alignment: a randomised controlled trial

“…However, the difference was only 0.2 mm per month, which is clinically not significant and in agreement with previous studies (Scott et al 2008;Dudic et al 2013). A study by Ireland et al (2016) looked at the effect of gender on orthodontic space closure and found that it was quicker in male participants. No raw data were given on the rate of space closure so it is unclear whether the findings were clinically significant.…”

In vitro evaluation of the influence of velocity on sliding resistance of stainless steel arch wires in a self‐ligating orthodontic bracket

“…In fact, the present research suggests to consider absolute values of RS with cautiousness if not performed at velocities compatible with the orthodontic movement. The concepts described in the present study are applicable to any sliding mechanic independently from the bracket system used and may help in the translational application of in vitro test to clinical situations, and in the interpretation of clinical trials and reviews comparing different bracket systems.…”

Frankfort Mandibular Plane Angle: Critically Appraised Topic (CAT)

“…Mesh headings related to the PICO question received zero PubMed references, as did Frankfort Mandibular Plane Angle as a determinant for dental occlusion and Frankfort Mandibular Plane Angle as a determinant of the occlusal scheme. Frankfort Mandibular Plane Angle alone received 168 citations which highlighted 2 DiPietro articles 2,3 and a third from the orthodontics literature 4 which was a Randomized Controlled Trial on 100 patients, ages 11 to 18, needing Orthodontic care and not relevant to the PICO question. One reference was in Greek, 5 that dealt with the reliability of a clinical instrument to measure FMA on dried skulls and only the Abstract was available in English.…”