Treatment effects of R-appliance and Bionator

Showkatbakhsh R, Jamilian A, Eslamian L. Treatment effects of R-appliance and Bionator in Class II division 1 malocclusion. Iranian Journal of Orthodontics. 2008; 3: 52-58

Abstract:

Objectives: The aim of this study was to compare the effects of a differently designed functional appliance (R-appliance) with a bionator treated group in Class II Division I (Cl II Div I) cases.

Method and Materials: 22 patients (12 girls, 10 boys) treated with R–Appliance were selected as experimental group. Control group consisted of 22 patients (11 boys, 11 girls) treated with a bionator. All of the patients had a Cl II Div I malocclusion due to mandibular deficiency. Lateral cephalograms were analyzed at the beginning (T1, T 1) and the end of the study (T 2, T 2).

Results: Paired T-test showed that SNB significantly increased in both groups. The same test revealed that IMPA was reduced in the R-appliance treated group by 4.5°±3.5° (P<0.001) but it was increased by 1.9°±3.9° (P<0.03) in the bionator group. Analysis utilizing T-test showed that the inter group difference of IMPA was statistically significant (P<0.01). SNA showed an increase of 0.1°±1.6° (P<0.9) in the R-appliance treated group; while, it was decreased for 0.4°±0.9° (P<0.1) in the bionator treated group.

Conclusions:

Both groups were successful in advancement of mandible; however, the R-appliance achieved this result without retroclination of the lower incisors.

Keywords

R-appliance, Bionator, Functional therapy, Mandibu