The Relationship between Sex and Age on Dental Arch Change after Treatment with the Reverse Pull Face Mask Appliance of Class III Malocclusion: a Randomized Clinical Trial

This study aims to evaluate the relationship between sex and age on dental arch change in the reverse-pull face mask appliance on dental study model measurements. This study is a randomized clinical trial consisted of 48 (21 males, 27 females) Malay children with Class III malocclusion allocated to two groups. A total of 48 children received reverse-pull face mask appliance for a period eight months therapy. The children were again divided into early and late treatment groups. The first treatment group is comprising 23 children treated in the early mixed dentition with a mean age of 8.50 (SD=0.20) years. The second treatment group is comprising 25 children treated in the late mixed dentition with a mean age of 10.54 (SD=0.30) years. The inclusion criteria were reverse overjet and Class III deciduous canine relationship and Class III molar relationship. Upper and lower impressions are taken at the beginning and end of treatment. Multiple regressions used to analyse the data. The significance level set at 0.05. There is no relationship between age and sex, affecting the dentoskeletal changes after treatment with a reverse pull face mask appliance. Assessment of post-treatment study models showed that both appliances changed the maxillary and mandibular dental arch shape but did not affect the inter-teeth distances. There are no effects of sex and age on dental arch change measurements after treatment with a reverse pull face mask appliance for the treatment of Class III malocclusion.