![labial veeer lam labial veeer lam](https://i.ytimg.com/vi/f5T-VOIijp4/maxresdefault.jpg)
Research has demonstrated that controlled and conservative tooth preparation is crucial for the long-term success of adhesive restorations. Optimal tooth reduction is a key requirement for aesthetics, function, and the longevity of fixed restorations. The DC technique presented the most accurate reduction result among the 3 protocols examined.
#LABIAL VEEER LAM TRIAL#
The trial restoration was significantly thicker than its corresponding waxing. Group DC presented the most accurate result of 0.51 ☐.08 mm with an MRD of 2%, whereas the results of 0.57 ☐.10 mm with an MRD of 14% and 0.60 ☐.11 mm with an MRD of 20% were obtained from group RB and group DC, respectively. Significant differences in RD were found among the 3 guided techniques (P<.05). With the use of a trial restoration, the RDTs of the middle (-0.01 ☐.11 mm) and cervical locations (0.09 ☐.20 mm) showed significantly smaller preparation depths than did the other locations. The thickness of the trial restorations was significantly greater than that of the digital waxings, with a discrepancy of 0.20 ☐.14 mm, especially at the cervical site. The mean relative differences (MRDs) were calculated to determine the accuracy (%). One-way ANOVA with a post hoc test was used to identify significant discrepancies between trial restorations and waxing and differences in the reduction depth of typodont teeth (RDT) and the reduction depth (RD) among the 3 techniques (α=.05).
#LABIAL VEEER LAM SOFTWARE#
The dimensional differences in the standard tessellation language (STL) files between the surfaces of the original teeth, digital waxing, trial restorations, and prepared teeth in the software program were measured and analyzed at the same 9 points on the labial surface. The 3 groups were randomly prepared with a random number table by 2 experienced prosthodontists aiming to produce an even facial clearance of 0.5 mm. The 30 maxillary central incisors were divided into 3 groups: the depth cutter (0.5 mm, Komet) (DC) group, the round bur (1.5 mm, Diatech) (RB) group, and the specially designed calibrated depth bur (laser mark of 0.5 mm, Gaofeng) (CD) group. The trial restorations were fabricated on typodont teeth with autopolymerizing acrylic resin by using a silicone index based on 3-dimensionally printed casts designed from the digital waxing. The purpose of this in vitro study was to evaluate the accuracy of 3 digital trial restorations fabricated from digital waxing for ceramic veneers.Ī uniform 0.3-mm digital waxing added to the facial surface of 30 maxillary central typodont incisors was created in a software program.
![labial veeer lam labial veeer lam](https://hodsollhousedental.co.uk/wp-content/uploads/2013/11/case2-after1.jpg)
The accuracy of digital waxing–guided trial restoration protocols that have been implemented with ceramic veneers has not been reported. 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. 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. Images of the prepared teeth were used to calculate the mean labial depth of preparation and incisal reduction of teeth in each group. Group A were prepared freehand while Groups B and C were prepared with the assistance of a silicone index and depth preparation bur respectively. 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. 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.