Journal of AdvancedMedical and Dental Sciences Research

Background: Polycrystalline or alumina polycrystalline brackets are made of aluminum oxide crystals fused at high temperatures (near 1950°C).Monocrystalline brackets are made of a single crystal produced from the combination of particles of aluminum oxide fused at a higher temperature (2100°C) and cooled slowly, thus enabling thorough control of crystallization. Aim of the study: Tocompare tensile bond strength between polycrystalline and mono crystalline ceramic brackets on maxillary anterior teeth. Materials and methods: The present study was conducted in the Department of Dentofacial Orthopedics and Orthodontics of the Dental institution. For the study, 10 sound extracted maxillary anterior teeth each type (maxillary central incisor, lateral incisor and canine) were selected. The teeth were distributed into 2 groups, each containing 30 teeth with 10 teeth of each type. Fracture analyses were performed using an optical stereomicroscope. Results: We used 20 each of maxillary central incisor, lateral incisor and canines for the study. Each type of teeth was grouped into 10 for each group for monocrystalline brackets and polycrystalline brackets. We observed that the mean tensile strength of both the groups was comparatively similar. The results on comparison were seen to be statistically non- significant. Conclusion: Within the limitations of the present study, it can be concluded that tensile strength of polycrystalline ceramic brackets and monocrystalline ceramic brackets are similar for anterior teeth. Keywords: Ceramic brackets, Monocrystalline, Polycrystalline