Research and EducationImpact of digital prosthodontic planning on dental esthetics: Biometric analysis of esthetic parameters
Section snippets
Material and Methods
Thirteen patients participated in this study. All of them presented with all of their maxillary anterior teeth and required diagnostic waxing before prosthodontic treatment. The indications for the treatment were failing restorations, tooth wear, or unesthetic teeth. A human research ethics approval was obtained from the Human Research Ethics Committee of the University of Western Australia (RA/44/1/5079). The treatments were provided at the Oral Health Centre of Western Australia.
For all of
Results
The average PFP of the lateral incisors and canines to the central incisors for all the casts are presented in Figure 4. The reported average lateral incisor proportion for the pretreatment, conventional waxing, and digital waxing casts was 65.6%, 60.8%, and 60.5%, respectively, and the canine proportion was 49.4%, 46.5%, and 45.8%, respectively. An exact match between any cast and GP (lateral incisors=68%, canines=38%) was not observed. However, the PFP pattern was relatively comparable to GP.
Discussion
Historically, recurrent PFP between the maxillary anterior teeth, such as GP, is thought to be associated with greater harmony and esthetics.3, 4 Although an exact match with GP was not observed for any cast of this study, relatively close values were obtained for the lateral incisor proportion. However, the canine proportion was larger, which means that the total perceived maxillary anterior teeth width is greater than what has been proposed by GP. The observed PFP values in this study
Conclusions
Within the limitations of this study, diagnostic waxing had a positive impact on the esthetic variables. The PFP was minimally affected and no recurrent PFP was observed. The anterior tooth morphology in the form of the W:H ratio was restored by the waxing to natural morphology. There are indications that the perceived and the actual symmetry had improved following the diagnostic waxing. In terms of tooth dimensions, proportions, and symmetry, the 2 waxing protocols are similar. From the
Acknowledgments
The authors thank the National Imaging Facility at the Centre for Microscopy, Characterization & Analysis, University of Western Australia (a facility funded by the University, State, and Commonwealth Governments); and the staff at the technical facility of the Oral Health Centre of Western Australia.
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Supported by the Research Development Award from the University of Western Australia and the Australian Prosthodontic Society.