Comparison of the Mini-plate and Mini-screw for Retraction of Anterior Teeth in Severe Bimaxillary Protrusion Cases with Extraction of First Bicuspids: A Protocol for Randomised Controlled Trial

Abstract

Introduction: Orthodontic treatment of severe Bi-maxillary protrusion cases involves extractions of all four premolars to provide space for anterior teeth retraction. Over the years different methods of retraction have been developed for individual tooth retraction and en-masse anterior teeth retraction utilising different types of mechanics for retraction purposes. Anchorage consideration has been a problem because of anchor loss, but it has been overcome by utilising absolute anchorage with Temporary Anchorage Devices (TAD). Need for the study: The TAD devices mini plates and mini-screw have been Known for providing absolute anchorage for retraction purposes but there has been limited evidence to prove which TAD device is better in terms of time taken for retraction and external root resorption. Therefore, the present clinical study aims to determine the superior treatment method using the two devices based on duration in terms of time taken and amount of retraction achieved in the specified time. Aim: Evaluation and comparison of the effectiveness of mini-plate and mini-screw for retraction of anterior teeth in severe bimaxillary protrusion cases with extraction of Ist bicuspids. Materials and Methods: A split-mouth randomised controlled trial will be carried out in the Department of Orthodontics and Dentofacial Orthopedics, Sharad Pawar Dental College and Hospital, Sawangi, Wardha, from October 2024 to March 2026 with a total of 11 subjects. The sample will be selected from the Outpatient Department based on the study’s inclusion and exclusion criteria. Informed written consent will be gathered from all participants. The patient sample will be divided into two groups: Group-A: will receive a mini screw (control group) and Group-B: will receive a mini-plate (experimental group). The statistical analysis for comparing the en-mass rate of retraction of anterior teeth (mm) in the allocated groups will be done using the Mann-Whitney test, and student’s t-test, with the significance level set at 5%.

Keywords

• absolute anchorage
• external root resorption
• temporary anchorage devices