Madhur Sharma

Abstract

Objectives: The study aims to evaluate and compare the maxillary and mandibular intercanine, interpremolar, intermolars width of pretreatment, posttreatment and two years after treatment, in patients treated with the Damon Q bracket system. Further, to compare the arch width changes during 3 years of follow up, in patients under complete retention for 3 years and the cases under retention for 2 years. Materials and Methods: A sample of 60 patients treated with all four first premolar extraction, using Damon Q bracket system were selected from the Department of Orthodontics. The pre-treatment and post-treatment models were collected. Patients were divided into Group I with 2-year retention and Group II with 3 years retention. The patients of these groups were recalled after 3 years. The records were taken and the models were scanned using an intraoral scanner. The transverse widths between the canines, premolar and molars were measured through a third-party software. The parameters were compared, within the group at three-time intervals and between the groups. Results: The intercanine width increased, whereas, the interpremolar and intermolar width decreased in both the groups after treatment. However, the comparison of the parameters from post treatment to follow up showed that in Group I the inter canine width decreased, but the interpremolar, and intermolar width increased, whereas, in group II the values remained almost the same. Conclusion: The parameters tend to revert to their original position once the retention is removed, whereas the cases under retention showed negligible changes in arch width. Keywords: Damon Q system, Intercanine width, Interpremolar width, Intermolar width, Intraoral scanner, Complete retention, two years follow up and Retro­prospective study

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Abstract

Objective: This multi-arm split-mouth randomized controlled trial aimed to compare the surface characteristics, coating thickness and coating stability of four different aesthetic coated Nickel-Titanium Orthodontic rectangular archwires before and after oral exposure. Materials and Methods: To evaluate and compare the surface characteristics of four as-received (Control group) aesthetic nickel-titanium orthodontic rectangular archwires (0.016 x 0.022? NiTi) from different manufacturers that are BioForce (Group I), Rabbit force (Group II), Libral (Group III), and ORMCO (Group IV) and after oral exposure (Experimental group) of four weeks, 15 patients meeting the inclusion criteria were recruited for this prospective study. Scanning electron microscopy, stereomicroscopy, and 3D profilometry were done for evaluating the surface characteristics of each group of wires. Results: Four quadrants of every patient were randomized in a 1:1:1:1 ratio to the wires of either BioForce (Group I), Rabbit force (Group II), Libral (Group III), or ORMCO (Group IV). On examination of as-received wires (control group), the maximum coating thickness was seen in Group III c (Teflon coated, Libral), followed by Group IIc (Epoxy coated, Rabbit Force), then Group Ic (Teflon coated, BioForce), and least in Group IVc (Epoxy coated, ORMCO). After 4 weeks of oral exposure, the maximum coating loss was seen in Group II (Rabbit Force) wire, and the least amount of coating loss was seen in Group IV (ORMCO). Conclusion: The results of this study indicated a low aesthetic value of each of the manufacturer’s coated archwires because they presented a non-durable coating after oral exposure. Keywords: Scanning electron microscopy (SEM), Stereomicroscopy, 3D profilometry

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