Influence of anatomic reference on the buccal contour of prosthetic crowns.
During clinical practice, when performing prosthetic rehabilitation with single crowns, improper reproduction of the dental contour by the dental laboratory is a common occurrence. Therefore, the present study evaluated the fidelity of the reproduction of the buccal contour in an upper left canine performed by three Dental Prosthesis Technicians (DPT) using the indirect laminate veneer technique. First, the DPTs confected the veneers based on a model obtained from the upper arch of a dental dummy, containing a replica of an upper left canine with a prosthetic preparation for a laminate veneer. Then, the same DPTs received other identical models, now with the replica of the upper left canine with no preparation, to be used as an anatomical reference for confecting the laminate veneers. The laminate veneers were then bonded to the plaster models and had their buccal contour individually measured. Measurements were also made of the buccal contour of the reference canine. The data were analyzed by ANOVA and the t-test (p = 0.05). Results showed 100% of buccal overcontour when the laminate veneers were compared to the reference canine, regardless of which DPT confected the veneer and regardless of using or not the anatomical reference. The DPTs who participated in the present study were unable to acomplish a faithful anatomical reproduction of the buccal contour, creating an overcontour in all samples. This situation may be responsible for increasing the probability of periodontal and esthetic harm in clinical practice.
Vasconcelos
Flávia Sabrina Queirós
FS
University of Taubaté, SP, Brazil.
Neves
Ana Christina Claro
AC
Silva-Concílio
Laís Regiane da
LR
Cunha
Leonardo Gonçalves
LG
Rode
Sigmar de Mello
Sde M
D003442:Crowns; D003481:Cuspid; D003761:Dental Impression Technique / Q000592:standards*; D017267:Dental Prosthesis Design / Q000592:standards; D003801:Dental Veneers; D003779:Denture Design / Q000592:standards; D006801:Humans