OBJECTIVE: To assess enamel surface under scanning electron microscopy (SEM) after resin removal and enamel polishing procedures following brackets debonding, as well as compare the time required for these procedures. METHODS: A total of 180 deciduous bovine incisors were used. The enamel surface of each tooth was prepared and brackets were bonded with light cured Transbond XT composite resin. Brackets were removed in a testing machine. The samples were randomized and equally distributed into nine groups according to the resin removal and polishing technique: Group 1, 30-blade tungsten carbide bur in high speed; Group 2, 30-blade tungsten carbide bur in high speed followed by a sequence of 4 Sof-lex polishing discs (3M); Group 3, 30-blade tungsten carbide bur in high speed followed by Enhance tips (Dentsply). All groups were subdivided into (a) unpolished; (b) polished with aluminum oxide paste; and (c) polished with water slurry of fine pumice. Subsequently, the enamel surface was assessed and statistical analysis was carried out. RESULTS: There were statistically significant differences in enamel roughness and removal time among all groups. Groups 3a, 3b and 3c appeared to be the most efficient methods of removing resin with low damages to enamel. Groups 2a, 2b and 2c were the most time consuming procedures, and Group 2a caused more damages to enamel. CONCLUSION: The suggested protocol for resin removal is the 30-blade tungsten carbide bur in high speed followed by Enhance tips and polishing with aluminum oxide paste. This procedure seems to produce less damages and is less time consuming.

No abstract

No abstract

Conventional radiographs or digital radiographs with high-pass filters could help enhance diagnosis on implant-bone interface.

Root resorption is the loss of dental hard tissues as a result of physiological or pathological clastic activity. Invasive cervical resorption is the clinical term used to describe a pathological form of relatively uncommon, insidious and aggressive resorption of the tooth, which may be asymptomatic and often undiagnosed, and occur in any tooth of the permanent dentition. It is usually a casual finding of radiographic routine or initial orthodontic records. This paper reports a case of invasive cervical resorption, and aims to raise awareness of potential occurrence of this type of lesion and highlight the importance of early diagnosis by dentists, radiologists and orthodontists who are often the first specialists to come across these kinds of images. Treatment will rely on the development of the lesion. In its initial stage, conservative therapy can be applied; while in advanced cases, radical treatment, such as tooth extraction, is the therapy of choice. The severity of the lesion will guide the choice for the best procedure.