RESUMEN
AIM: The aim of this study is to evaluate the efficiency of canine distraction and also to evaluate the position of canine in the arch after distraction. MATERIALS AND METHODS: The study sample consisted of five patients, (4 males and 1 female), in the age group of 14 to 25 years who needed canine retraction (ten maxillary canines including both left and right) and first premolar extraction as their treatment protocol were included in the study. This study used a in-house manufactured periodontal ligament distractor. RESULTS: The maxillary canines were distracted distally by 6.42 mm in three and half weeks with a distal tipping of around 15.1° and the maxillary first molars tipped mesially by an average of 6.1°. The maxillary canines rotated mesiobucally by an average of 7.8° bilaterally. CONCLUSION: Canines can be distracted rapidly with minimal effects on the vitality and the periodontal condition and almost all of extraction space can be used for anterior dental alignment or retraction. Maxillary canines can be rapidly retracted into the first premolar extraction space at the rate of about 2.43 mm per week. CLINICAL SIGNIFICANCE: The overall treatment time is reduced as the time taken for retraction of canine is decreased considerably from 6 and 8 months to 3 weeks. Also there is no significant anchorage loss during this period and is well suitable for cases with group a anchorage where the whole extraction space is needed for retraction of anterior teeth.
Asunto(s)
Diente Canino/patología , Cierre del Espacio Ortodóncico/métodos , Ligamento Periodontal/patología , Adolescente , Adulto , Diente Premolar/cirugía , Cefalometría/métodos , Femenino , Humanos , Masculino , Métodos de Anclaje en Ortodoncia/instrumentación , Métodos de Anclaje en Ortodoncia/métodos , Diseño de Aparato Ortodóncico , Cierre del Espacio Ortodóncico/instrumentación , Radiografía de Mordida Lateral , Radiografía Panorámica , Extracción Dental , Técnicas de Movimiento Dental/instrumentación , Técnicas de Movimiento Dental/métodos , Adulto JovenRESUMEN
AIM: The study was undertaken to measure the changes within the mesh pad associated with reconditioning process, measure the bond strength of new and reconditioned orthodontic brackets and correlate the changes in mesh strand diameter with changes in bond strength. MATERIAL AND METHODS: 120 clinically normal premolar teeth extracted for orthodontic reasons, were divided equally for bonding with new and recycled brackets using a no-mix type of adhesive. The mesh strand diameters of new and reconditioned brackets were evaluated with a binocular light microscope. Recycling of brackets was done using Esmadent® bracket and band reconditioner. RESULTS: The mesh strand diameter, tensile and shear bond strength of new and reconditioned brackets were evaluated statistically and the latter was found to show a significant reduction (p< 0.0001). However, the bond strength values of the reconditioned brackets were found to be well above the clinically required minimum. CONCLUSION: Reduction in mesh strand diameter, as a result of reconditioning process, does not correlate with the change in bond strength between initial and recycled bondings. CLINICAL SIGNIFICANCE: The bond strength of reconditioned brackets is adequate enough to resist the magnitude of forces generated in the mouth, throughout the duration of orthodontic treatment for successful treatment results.