Objective:The aim of this study was to evaluate the effect of agents available in whitening toothpastes (Crest® and Sensodyne®) in vitro on the force decay of elastomeric chains used in orthodontics.Materials and Methods:A total of 300 specimens of elastomeric chains were divided into five groups (n = 60) and were evaluated. These groups included (1) the regular Crest® toothpaste and distilled water solution, (2) whitening Crest® toothpaste and distilled water solution, (3) regular Sensodyne® toothpaste and distilled water solution, (4) whitening Sensodyne® toothpaste and distilled water solution, and (5) distilled water as a control group. The samples' force was measured using Instron at intervals of 0, 1, 7, 14, 21, and 28 days. Data were analyzed by SPSS software.Results:At the initial time point, the difference in the force values of elastomeric chain between any of the groups was not significant (P > 0.05). On the 1st day, there was a significant difference (P < 0.05) between all groups except the groups of whitening Crest®, regular, and whitening Sensodyne® (P > 0.05). On days 7, 14, and 28, the rate of decline for all groups was statistically significant (P < 0.05).Conclusions:According to the results obtained in the present study, it seems that toothpastes without whitening agents have less effect on force decay of elastomeric chain over time.

Introduction: Force decay elastomeric chains are significant, and it is a clinical problem. Aim:The aim of this study was to evaluate the effects of bleaching agent in the mouthwash on the force decay of orthodontic chains. Materials and methods:In this experimental study, 160 gray closed elastomeric chains were randomly divided into three groups (one control and two test groups). Clinical significance: Use of whitening mouthwash by orthodontic patients could decrease the force of elastomeric chains, so it could be recommended to use them for a short time.

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Context: In recent years, lasers have numerous applications in orthodontics as an important field of dentistry. The purpose of this article is to review some of the major applications of laser in the field of soft tissue management in orthodontics. Evidence Acquisition: No single laser wavelength can be used to optimally treat all dental diseases. However, the needs of the orthodontic clinician are unique and selection of the most appropriate laser for orthodontic applications is essential to achieve optimal results. Results: Light emitted from diode lasers is poorly absorbed by dental hard tissues, these lasers can be safely used for soft tissue surgery applications, including gingival recontouring, crown lengthening, removal of hypertrophic tissue and frenectomies close to the enamel, dentine and cement. Considering beam safety, most of the lasers used for medical and dental purposes are in the Class IV category, so it is necessary to take appropriate safety measures. Conclusions: In the near future, with the clarification of laser exposure protocols and a decrease in device cost and, Dental lasers may play an increasingly important role in soft tissue management during orthodontic treatment.