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AIM AND BACKGROUND: This systematic review aimed to investigate the efficacy of laser photobiomodulation (PBM) on the acceleration of orthodontic tooth movement (OTM). REVIEW METHODS: The study protocol was registered at PROSPERO (CRD42019121465). An extensive electronic search for randomized control trials and clinical control trials via Medline (via PubMed), The Cochrane Controlled Clinical Trials Register, and Scopus up to date 24/02/2019 was done. Hand searching was performed for relevant journals. Reference articles were retrieved and exported to Mendeley Desktop 1.13.3 software. The risk of bias was assessed using the Cochrane risk of the bias assessment tool. Articles were further analyzed using Revman5.3 software. RESULTS: A total of 14 articles were considered for systematic review and 9 articles were considered for meta-analysis. The results of the meta-analysis showed a significant difference between the laser group and conventional orthodontic treatment with Forest plots showing more tooth movement in the laser group compared to the control group in 2-3 months (mean difference = 1.73; CI: 0.9-2.57; p = 0.00001; I 2 = 89 %). CONCLUSION: Although the analysis of the results shows that laser PBM favors OTM, the results are inconclusive as the heterogeneity across studies was high. CLINICAL SIGNIFICANCE: Laser PBM may be considered as novel, safe, and noninvasive adjuvant therapy for the acceleration of OTM in children. HOW TO CITE THIS ARTICLE: Yavagal CM, Matondkar SP, Yavagal PC. Efficacy of Laser Photobiomodulation in Accelerating Orthodontic Tooth Movement in Children: A Systematic Review with Meta-analysis. Int J Clin Pediatr Dent 2021;14(S-1):S94-S100.
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INTRODUCTION: The presence of bacteria in root canals has been considered to be responsible for endodontic treatment failure, even in case of primary teeth. The use of lasers can be a valuable addition in removing bacterial load in areas where traditional methods may fail to succeed. Methods like direct laser irradiation of canals, Laser Activated Irrigation (LAI) with sodium hypochlorite (NaOCl) and Photodynamic Therapy (PDT) seem to be a promising alternative for disinfection. AIM: This study was designed to compare the efficacy of latest advancements in disinfection techniques using diode laser namely direct laser irradiation, photodynamic therapy and laser activated irrigation using sodium hypochlorite. MATERIALS AND METHODS: Sixty freshly extracted primary teeth either single or multi-rooted teeth with two third of their root length intact were collected. Instrumentation was completed to size 30 H-file. Teeth were randomly divided into Group 1- Direct Laser- irradiation, Group 2 - Photodynamic therapy; Group 3- Laser activated irrigation with 2.5% NaOCl. The tooth specimens were inoculated with Enterococcus faecalis. The bacterial colonies were counted preoperatively. Laser irradiation was performed for all groups in accordance to the groups each tooth belonged to. Postoperatively the bacterial colonies were counted. One-way Analysis was applied to compare bacterial count at baseline and post-test between three groups. Tukey's post-hoc test was applied for pairwise comparison between groups. Paired t-test was applied to compare the mean baseline bacterial count with post-test mean bacterial count. RESULTS: The results obtained with all the three groups postoperatively were highly significant (p-value<0.001). Statistically significant difference between results of Group 1 and Group 2 and also between Group 1 and Group 3 was found (p-value≤ 0.001). However, no statistical difference between Group 2 and Group 3 was found (p-value- 0.96). CONCLUSION: Disinfection strategies using diode laser by techniques gives promising results. Techniques like laser activated irrigation and photoactivated disinfection are better than direct laser irradiation in eliminating Enterococcus feacalis.
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BACKGROUND: Over a period of the past few years' episodes of dental trauma more commonly coronal fractures of anterior teeth are being increasingly reported in children. Fragment reattachment can be considered as a valid treatment option in such situations. However, ideal medium for storage of fragments before reattachment needs to be explored. AIM: To compare the fracture resistance of incisor tooth fragments stored in four storage media: Dry air, milk, coconut water, or egg white before reattaching them with G-aenial Universal Flo. MATERIALS AND METHODS: Forty-eight freshly extracted maxillary incisors were divided into four groups. Teeth were then sectioned, and fragments were stored in dry air (Group I), milk (Group II), coconut water (Group III), and egg white (Group IV). The fragments were reattached using simple reattachment technique and tested on the Universal Testing Machine. Statistical analysis was performed using one-way analysis of variance and post hoc Tukey's test. RESULTS: There was statistically significant difference (P < 0.05) in fracture resistance values between the groups. The highest fracture resistance value was demonstrated by Group II, whereas least fracture resistance values were observed in Group IV. CONCLUSION: Along with milk, coconut water being tested for the first time can be considered a viable alternative.
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BACKGROUND: Though stainless steel crowns (SSCs) have often been stated as the best restorative modality, there are limited studies demonstrating its efficacy in restoring the functional integrity of the primary dentition. Hence has arisen, the necessity to establish the supremacy of SSCs. AIM: Evaluation of the efficacy of SSC to with stand compressive (0°), shearing (90°), and torsional (45°) stress when used as a restorative material. SETTINGS AND DESIGN: The study design employed four finite element models, each with differing amounts of tooth structure, which were exported to ANSYS software and subjected to an average simulated bite force of 245N. MATERIALS AND METHODS: Four maxillary deciduous primary molars restored with SSCs (3M ESPE) were subjected to spiral computed tomography (CT) in order to obtain three-dimensional (3D) images, which were then converted into finite element models. They were each subjected to forces along the long axis of the tooth and at 45°and 90°. RESULTS: The maximal equivalent von Mises stress was demonstrated in the SSCs of all the models with only a minimal amount observed in the underlying dentine. In all situations, the maximal equivalent von Mises stress was well below the ultimate tensile strength values of stainless steel and dentine. CONCLUSION: Even at maximal physiologic masticatory force levels, a grossly destructed tooth restored with SSC is able to resist deformation.