Restorative dentistry: Tooth preparation techniques for porcelain laminate veneers

Unit of Operative Dentistry and Endodontology, University Dental Hospital of Manchester.
British dental journal (Impact Factor: 1.08). 09/2000; 189(5):260-262. DOI: 10.1038/sj.bdj.4800739


Objective The purpose of this study was to determine the effect that two guides to tooth preparation had on an operator's ability to appropriately and consistently prepare teeth for porcelain laminate veneers.Study designIn-vitro studyMaterials and methods Thirty typodont central incisor teeth were randomly allocated into three groups and a general dental practitioner was asked to prepare the teeth for porcelain laminate veneers. Group A were prepared freehand while Groups B and C were prepared with the assistance of a silicone index and depth preparation bur respectively. Images of the prepared teeth were used to calculate the mean labial depth of preparation and incisal reduction of teeth in each group.Results The mean labial reduction for Groups A, B and C was 0.37 mm (SD 0.13), 0.62 mm (SD 0.17) and 0.61 mm (SD 0.15) and the mean incisal reduction for Groups A, B and C was 1.0 mm (SD 0.28), 1.0 mm (SD 0.38) and 1.03 mm (SD 0.26) respectively.Conclusion It is suggested that consideration be given to the use of a silicone index or depth gauge bur when teeth are prepared for porcelain laminate veneers.

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    ABSTRACT: : Crown fractures as a part of traumatic injuries are common among schoolchildren. They create serious functional, esthetic and psychological problems. The clinicians must deal with sometimes small patient's age, need of high esthetics in the front part and the choice of exact treatment plan. Repeated reconstructions are needed in many cases because of compromised results as time passed by. Achievement of promising restoration that preserves its esthetics and strength is the greatest desire for both children and their parents. In this review are collected data for the usage of laminate veneers for restoring fractured incisors in schoolchildren. A critical analysis of proposed from different authors improvements and objections has been made. These methods summarize succession in the right therapeutic approach. Aim of this study is to discuss the available dental literature concerning reconstruction of fractured permanent incisors using laminate veneers. In the last 20 years dentists manufacture veneers to the teeth using different techniques for corrections of esthetic problems. The veneers are divided in three groups according to the materials and techniques applied: 1. direct composite veneers 2. direct-indirect composite veneers and preformed acryl laminates 3. indirect (laboratory made) acryl, composite, porcelain and glass-ceramic veneers · Advantages and disadvantages The clinicians prefer and recommend definite kind of veneer according to the clinical case. Most often cited in the literature advantages and disadvantages of the veneers are shown on table 1. Introduction of enamel etching technique and elaboration of hybrid and microfilled composite resin materials gives opportunity for more conservative restoration of fractured teeth connected with application of minimal tooth preparation. In 1975 the first porcelain veneers have been placed after testament of the connection with tooth structures (16). Development of the adhesive systems leads to creation of more stabile linkage between bonding surfaces and tooth structures. (4,6). · Indications Indications for utilization of veneers are pretty large. There are evidences for their usage in tooth fractures, diastema, teeth with malformations, change of position, discolorations (4). Veneers are indicated in restoration of fractured permanent teeth at children for strength improvement and achievement of satisfied esthetics (11).
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