Browsing DCG Research and Table Clinic Day 2019 by Authors
Aesthetic improvement of a smile using minimal intervention procedures. A case reportCowan, Marcus; Babb, C; Romero, M; Pruett, M; Coleman, J; Department of Restorative Sciences (Augusta University, 2019)Tooth discoloration, particularly affecting the maxillary anterior teeth, is often an esthetic concern for dental patients.1 The most common cause of intrinsic tooth discoloration is dental fluorosis (DF),1 which is enamel hypomineralization due to long-term ingestion of high levels of fluoride during tooth mineralization.2 DF results in white opaque areas or discolorations ranging from yellow to dark brown, with porosities on the enamel surface.3 A widely-used scale for classifying the severity of DF is the Tooth Surface Index of Fluorosis (TSIF), developed by Horowitz, by which the examiner determines the extent of affected enamel by estimating the amount of DF as a fraction of the total visible enamel surface.4 Microabrasion, introduced by Croll and Cavanaugh in 1986,5 is a technique used to correct surface enamel irregularities and remove intrinsic enamel stains through the application of hydrochloric acid combined with pumice in a paste.6 When performed correctly and conservatively, the amount of enamel loss from microabrasion is clincally insignificant.7 The success of microabrasion depends upon the extent and severity of the discoloration, and occasionally a slightly yellowish appearance will result from the yellow dentin shade showing through the translucent enamel.8 The final appearance can be improved by dental bleaching, with long-lasting results.7 The following article is a clinical report of the use of microabrasion combined with nightguard bleaching with 10% carbamide peroxide to improve the appearance of teeth affected by fluorosis.
Conservative Porcelain Veneer: Step by step protocol for ideal preparationWooten, Rebekah; Coleman, J; Pruett, M; Romeo, M (Augusta University, 2019)Since the 1930s laminate veneers have been commonly used to improve appearance of teeth, but they did not become popular until enamel etching and porcelain surface treatments made them more clinically predictable in the 1980s.1 Over the years, they have been indicated to modify the color, shape, length and alignment of teeth to improve their esthetic appearance. Contraindications include severely discolored teeth and lack of enamel remaining to support the restoration.3 Treatment planning is the first step to ideal veneer preparation, which involves determining the incisal edge position, shape and proportions of the teeth being restored. This information is obtained form the diagnostic wax-up and subsequent esthetic mock-up. Veneer preparations often follow one of two common reduction patterns: conservative or standard. The difference between the two being the amount of tooth structure removed. The conservative approach involves reduction of 0.3 mm gingival third, 0.5 mm middle third, and 0.7 mm incisal third; or no reduction may be required. The standard preparation typically follows a reduction pattern of 0.8 mm gingival, 1.0 mm middle, and 1.2 mm incisal. Incisal reduction can be characteristic of either technique to allow room for the addition of incisal effects such as halo and translucency. In order to ensure porcelain veneers have the maximum lifetime expectancy, it is imperative to have preparations entirely in enamel. Bonding porcelain veneers to enamel increases their fracture strength. 2 Based on the best available evidence the ten year survival rate for porcelain veneers is at around 95% if bonded to enamel.1 Maxillary midline diastemas (MMD) are present in 28% of the population, and 87.5% of females with a midline diastema are dissatisfied and seek treatment.3 This clinical report focuses on the clinical management of a maxillary midline diastema (MMD) with porcelain veneers through a conservative preparation and incisal reduction.