The Relationship Between Sex and Age on Dental Arch Change in the Reverse Twin Block Appliance on Dental Study Model Measurements: A Randomized Clinical Trial

摘要

The human craniofacial skeleton and its associated dental arches undergo visible alterations as they grow. Relatively rapid changes take place during the transitional dentition in the dental arches. The purpose was to evaluate the relationship between sex and age on dental arch change in the reverse twin block appliance on dental study model measurements.This study is a randomized clinical trial consisted of 49 (22 males, 27 females) Malay children with Class III malocclusion were allocated to two groups.The first group which consist of 23 subjects (10 males, 13 females) treated in the early mixed dentition with mean age of was 8.43 (SD=0.20) years and late-treatment group included 26 subjects (12 males, 14 females) treated in the late mixed dentition with mean age of was 10.45 (SD=0.29) years. Upper and lower impressions were taken at the beginning and end of treatment. Multiple regressions were used to analyse the data. Significance level was set at 0.05. There is no relationship between age and sex affecting the dentoskeletal changes after treatment with reverse twin block appliance. Assessment of post treatment study models showed that both appliances changed the maxillary and mandibular dental arch shape but do not affect the inter-teeth distances. There are no effects of sex and age on dental arch change measurements after treatment with Reverse Twin Block appliance for the treatment of Class III malocclusion.