Development and Clinical Application of Digital All-Porcelain Veneer System

Objectives: To develop a digital all-porcelain veneer system based on 3D design and rapid prototyping technology for clinical application, and to carry out.
Methods: Patients with the need of all-porcelain veneer restorations for anterior teeth were selected, conventional abutment preparations, impressions and plaster models were achieved progressively. The plaster models were scanned by Breuckmann scanner (Kavo, Germany) and 3D digital models were acquired. 3D registrations were run by Geomagic Studio software (3D Systems, USA) to simulate the centric occlusion. The margins of preparations were constructed by B-splines and the area of tissue surfaces were selected from the digital models. The morphology of polished surfaces of the restorations was obtained by three methods, which were mirror and copy; registration of diagnostic wax up and design from the standard tooth data. The technology of “Local common data registrations” was developed on software to improve the accuracy of the calculation. The margins of the restorations were designed with the thickness of 0.05mm, and there was no interference between adjacent restorations. The 3D data of the restorations were processed by HD3510 rapid prototyping machine (3D System, USA). Restorations of resin material were acquired and tried on the working models. The final restorations of all-porcelain were casted with the material of high transparent porcelain blocks (IvoclarVivadent, the Principality of Liechtenstein). After clinical trying, grinding, dyeing and glazing, the final restorations were bonded for the patients.
Results: The digital all-porcelain veneer system developed in this study has been used and 5 cases of dental defects were cured. The treatments showed good results on adapting, margin sealing, and esthetics. Certain advantages were showed in the situation of multiple teeth treatment and gap closure between anterior teeth.
Conclusions: The digital all-porcelain veneer system developed in this study fulfills the requirement of clinical application, which is worthy of further research and application.