One of the Problems with fixed orthodontic appliances is their visibility, and possible negative effects on patient's appearance during treatment. In this regard orthodontists have tried for a long time to design an appliance with minmal effect on appearance.By considering these facts lingual Orthodontics has been developed and also gained popularity among patients.In this paper with a brief review of lingual Orthodontics, one of these appliances (Thomas creekmore) and its clinical use has been introduced.

A laser is a collimated single wavelength of light which delivers a concentrated source of energy. Soon after different types of lasers were invented, investigators began to examine the effects of different wavelengths of laser energy on oral tissues, routine dental procedures and experimental applications. Orthodontists, along with other specialist in different fields of dentistry, can now benefit from several different advantages that lasers provide during the treatment process, from the beginning of the treatment, when separators are placed, to the time of resin residues removal from the tooth surface at the end of orthodontic treatment. This article outlines some of the most common usages of laser beam in Orthodontics and also provides a comparison between laser and other conventional method that were the standard of care prior to the advent of laser in this field.

Introduction and Aims: Loss of the bracket-tooth bond is one of the most common complaints of patients during orthodontic treatment. Various factors play a role in preventing the loss of such a strong bond between the bracket and tooth, one of which is the maintenance of proper isolation and prevention of contamination of tooth surface with blood during the surgical exposure of the impacted tooth. In case of bleeding during disimpaction treatment, the use of hemostatic agents might decrease the odds of tooth surface contamination with blood, resulting in a strong bond. This study aimed to evaluate the effect of different hemostatic agents on the bond between the bracket and tooth. Materials and Methods: Science Direct, PubMed, and Google Scholar databases were searched for relevant previous studies published from 2010 to 2020. These studies’,titles and abstracts were evaluated for inclusion criteria. In vivo and in vitro studies evaluating the effect of hemostatic agents on the bracket-tooth bond were included. Results: Eight studies were included in the study based on inclusion criteria,five studies were in vitro, and two were in vivo,one study had both designs. Of in vitro studies evaluating the bond strength, five studies reported a higher bond strength in the control group than the group in which the tooth surfaces were contaminated with a hemostatic agent,besides, the bond strength in the hemostatic agent group was higher than that in the group in which the tooth surfaces were contaminated with blood. Of in vivo studies, two studies evaluated bracket failure as a criterion to evaluate bonding quality. In one of these studies, bracket failure in the control groups was more than the hemostatic agent group, and in the other study, it was more prevalent in the hemostatic agent group than the control groups. Studies comparing different hemostatic agents did not report any significant differences in bonding quality. Conclusion: It appears that the use of hemostatic agents in disimpaction treatments can prevent contamination of tooth surface with blood, increasing the bond strength between the bracket and tooth,however, care should be exercised to prevent tooth surface contamination with hemostatic agents.

Background and Aims: The purpose of this study was to investigate the application of nanoparticles in Orthodontics. Materials and Methods: This study was conducted using a review method by searching Scopous, Google Scholar and Web of science. Key words (Nano silver, Nano ZnO, Nano Chitosan, Nano Curcumin and Nanoparticles) were used. These searches were limited to the English ariticles after the year 2010. Conclusion: According to the published studies, silver nanoparticles, curcumin, titanium oxide, chitosan, zinc oxide, quaternary ammonium derivatives exhibit appropriate antibacterial properties. Further studies are recommended to investigate the effect of each of these nanoparticles on the bond strength. In order to reduce the decay, there is lack of evidences regarding the addition of ACP nanoparticles and nanoparticles of calciumphosphate and fluoride. Therefore, further studies are recommended. Studies have shown that the addition of zinc oxide nanoparticles to orthodontic wires could reduce the friction between the wire and the bracket. While, adding titanium oxide nanoparticles to bracket increased the friction. Although, evidences in this regard are inadequate but it seems that nanoparticulates are less toxic than conventional materials.

Nanotechnology in Orthodontics has paved the way for researchers who are stridently making progress on improving treatment quality and patient care through understanding of the specific nanoparticles (NPs) applications in Orthodontics in elevating treatment efficiency and improve patient outcomes. This review examines the scope of work nanoparticles assist in enhancing current treatment’s antibacterial properties, and nanoparticles role as carrier in delivering medicine to a specific part of the body. Additionally, nanoparticles in the field of Orthodontics holds promise for the prospects of smart orthodontic gadgets that could streamline better medical technology in the future. This means clinical outcomes, treatment efficiency, and medication performance can all be improved using nanoparticles. A comprehensive evaluation of the benefits and challenges associated with nanoparticles utilization including problems such as toxicity, biocompatibility with the human body, and regulatory factors. The latest developments in the field of orthodontic therapy and the relationship between nanotechnology and its impact towards human is discussed through the use of case studies and current clinical trials. Proposals for future research related to orthodontic nanotechnology using a number of innovative ways, such as genetically tailored treatment regimens, that can be used as nanoparticle drug delivery to offer personalized and efficient drug doses. Overall, this review highlighted the tantalizing concept of nanoparticles in Orthodontics, which could greatly change the face of orthodontic therapy and set better standards for patient care, as well as improve clinical outcomes.