Comparison of the Effectiveness and Outcome of Infrazygomatic Crest Implants with Temporary Anchorage Devices

Abstract

Background and Aim: Orthodontic treatment with fixed appliances requires stable molar anchorage. Mini-implants can be an efficient alternative to conventional molar anchorage, particularly in maximum anchor-age settings. The aim of this study is to compare infrazygomatic crest mini-implants with inter-radicular mini-implants for en masse anterior retraction of teeth inorthodontic patients who underwent therapeutic extraction of maxillary 1st premolar.
Material and Methods: Present prospective randomized control trial done in the department of Orthodontics and Dentofacial Orthopaedics, Tertiary Care Dental College of India. A total of 44 patients were included in the study. Standard orthodontic records were taken which included case history, extra-oral and intra-oral photographs, lateral cephalogram and panoramic radiographs. A diagnosis was made and a detailed treatment plan was formulated. The patients included in the study were randomly divided into 2 groups. Both the patients had an intervention, the study group G1 included patients for whom infrazygomatic crest mini-implant were placed. The second study group G2 included patients for whom inter-radicular mini-implant was placed. Patients were recalled every month to access the space closure and for engaging new e-chain. Any complications that rose were duly addressed to. The patient was followed up to the point of space closure.
Results: The changes in SNA in this group were statistically significant and the post treatment values were 87.29 ± 6.11 with a p value of 0.003. The retraction of the maxillary incisors have an effect of the A point of the maxilla and the upper lip. The pretreatment values of position of U1 to NA, L1 to NB are 8.80 ± 3.07 mm and 8.01 ± 2.54 mm respectively. Both the values were significantly reduced. The changes of SNA post retraction in this group was not statistically significant and was with a mean value of 94.30 ± 10.14. The angulation of the maxillary incisor was significantly reduced and this was observed from the following measurements.
Conclusion: There are no significant changes in the type of retraction brought about by infrazygomatic crest mini-implant and inter-radicular mini-implant. Infrazygomatic crest and inter-radicular mini-implants can both be used as temporary anchorage devices and prevent the mesial migration of the molar unit.