Effect of the Bimler functional appliance treatment on Class II division 1 patients
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The effect of the Bimler appliance on the treatment of Class II division I malocclusion is largely unknown, as few if any, independent studies have evaluated the effect of this specific appliance on Class II division I patients. The objective of the present study was to determine the clinical, and skeletal effects of the Bimler functional appliance when it is used to treat Class II division I malocclusions. The data for the present study were obtained from the records of patients treated by Dr Bimler in his private practice which is located in Wiesbaden in Germany. All of the class II division I cases used in the present study were selected randomly from the records compiled by Dr Bimler himself. The Cases were selected until a sufficient number (n=30) of records were collected. The records were selected to represent both sexes (14 males, and 16 females). Cephalometric measurements were made on radiographs taken at the commencement of treatment (T1) and as well as at the completion of treatment (T2). Nine linear and seven angular measurements were evaluated in this study. The average age of all of the patients was nine years and eight months, with the males being approximately two and one half months older than females when treatment was started. Treatment duration was approximately two and one half years for all of patients with the treatment for the male's lasting several weeks longer than the treatment for the females. This difference was not statistically significant (P=0.05). Each mean change was tested using a paired Student's t-test where the null hypothesis was that no change took place in each parameter from T1 to T2. In addition a test was done to determine if the amount of change that occurred was statistically different between the males and the females. Statistically significant changes associated with the Bimler treatment were observed for ten of the 16 measurements recorded. These measurements included the angle ANB, U1-L1 and U1-SN, the linear measurements Co-A, Co-Gn, Ar-Gn, ANS-Me, Wits, L1-Apo and Overjet. In no determination was there a statistically significant difference (p≤0.05) between the males and the females. In this study it was concluded that: The clinical overjet was decreased by the increased forward growth of the mandible and by dentoalveolar changes. The Bimler appliance appears to have mainly skeletal effects with a few smaller, but significant, dentoalveolar effects. The appliance had little or no effect on the maxillary skeletal structures.