Comparison of effects of twin-block and Forsus anchored on orthodontic mini-implants on skeletal, Dento-alveolar and soft tissue structures

Introduction: Class II division 1 malocclusion due to mandibular retrognathism is considered as one of the most frequently encountered problems in the orthodontic practice. Objective: To compare dento-alveolar, skeletal and soft tissue effects of Twin Block appliance and Forsus FRD anchored on orthodontic mini-implants. Also, to evaluate whether an association of orthodontic mini-implant with Forsus FRD bring absolute skeletal correction of Class II division 1, avoiding the undesirable proclination of lower anterior teeth. Materials and Methods: This retrospective study included 2 groups: TB and FFRDI of 7 patients each. Lateral cephalograms were traced using NemoCeph (NemoCeph, NX 2006) software at T1(Pre treatment) and T2(Post functional). The data obtained was analyzed by using descriptive statistics, Paired t-test and Independent sample t-test through SPSS for windows (v 22.0). Results: TB was able to induce both skeletal and dento-alveolar effects while FFRDI mainly induced skeletal effects. Significant lower incisor proclination occurred with TB while there was slight or almost no change in the inclination of lower incisors with FFRDI. Maxillary molar retroclination was significant in both the groups. Maxillary molar moved distally in both the groups significantly.SNA decreased in both the groups, by 0.58° in TB and significantly reduced by 2° in FFRDI. Conclusion: Both appliances were effective in correcting the class II division 1 malocclusion. Skeletal changes were induced by FFRDI while TB induced skeletal and dento-alveolar changes. Favourable soft tissue corrections were achieved by both the groups.