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D i g i t a l w a x p r o t o t y p e s : A c l i n i c a l r e p o r t instrumentation. One limitation is that the wax prototypes do not have enough retention, a problem with restoration try-ins. Denture adhe- sive or fit checker (GC America, Tokyo, Japan) can be used to minimize this issue. The wax pro- totype can then be sent to the laboratory tech- nician, who can then invest it as he or she would a wax pattern created through the traditional waxing process. This wax prototype technique presents a unique melding of traditional and digital dental processes. CAD/CAM technology is used for designing and milling the wax prototype, which is then used as a traditional wax pattern to create the pressed, metal–ceramic or milled final res- torations. Using this method in this clinical sit- uation allowed for all of the restorations to be made in the same method, even though different materials (lithium disilicate for the anterior and metal–ceramic for the posterior) were used, making for a more streamlined production pro- cess. When used to create the final restoration, the wax prototype works as a template, to avoid modifying the final restoration during the deliv- ery. In many cases, clinicians need to modify the restoration by grinding and polishing. Depending on the modification process, the final restoration can end up with internals fracture lines devel- oped as a consequence of grinding the ceramic material that are not recognized by the clinician and can jeopardize the treatment plan and the life span of the restoration. Conclusion CAD/CAM has brought many advantages to restorative dentistry, including producing predict- able restorations in less time compared with tra- ditional methods of fabrication. In this compre- hensive prosthodontic rehabilitation of a severely worn dentition, the virtual diagnostic wax-up and final restoration CAD took less than 60 min for each procedure. Additionally, the wax prototype is a multipurpose restorative tool, as it serves as both an esthetic and functional try-in device and as a wax pattern for the final restoration. Competing interests The authors declare that they have no conflict of interest regarding the materials used in the present study. Acknowledgments The authors thank Dr. William Bracket for his assistance in reviewing this article. References 1. Johansson A, Johansson AK, Omar R, Carlsson GE. Rehabilitation of the worn dentition. → J Oral Rehabil. 2008 Jul;35(7):548–66. 5. Bloom DR, Padayachy JN. Increasing occlusal vertical dimension—why, when and how. → Br Dent J. 2006 Mar 11;200(5):251–6. 6. Ferencz JL. Increasing VDO and the use of CAD/CAM: prosthodontic principles and the full-mouth recon- struction. → J Cosmetic Dent. 2013 Summer;29(2):86–96. 7. Reich S, Trentzsch L, Gozdowski S, Krey KF. In vitro analysis of laboratory- processed and CAD/CAM-generated occlusal onlay surfaces. → Int J Prosthodont. 2009 Nov–Dec;22(6):620–2. 2. Al-Omiri MK, Lamey PJ, Clifford T. Impact of tooth wear on daily living. → Int J Prosthodont. 2006 Nov–Dec;19(6):601–5. 3. Vailati F, Carciofo S. CAD/CAM monolithic restorations and full-mouth adhesive rehabilitation to restore a patient with a past history of bulimia: the modified three-step technique. → Int J Esthet Dent. 2016 Spring;11(1):36–56. 4. Wassell RW, Steele JG, Welsh G. Considerations when planning occlusal rehabilitation: a review of the literature. → Int Dent J. 1998 Dec;48(6):571–81. 8. Anadioti E, Aquilino SA, Gratton DG, Holloway JA, Denry I, Thomas GW, Qian F. 3D and 2D marginal fit of pressed and CAD/CAM lithium disilicate crowns made from digital and conventional impressions. → J Prosthodont. 2014 Dec;23(8):610–7. 9. Chiche GJ, Aoshima H. Functional versus aesthetic articulation of maxillary anterior restorations. → Pract Periodontics Aesthet Dent. 1997 Apr;9(3):335–42; quiz 343. 10. Vig RG, Brundo GC. The kinetics of anterior tooth display. → J Prosthet Dent. 1978 May;39(5):502–4. 11. Wolfart S, Thormann H, Freitag S, Kern M. Assessment of dental appearance following changes in incisor proportions. → Eur J Oral Sci. 2005 Apr;113(2):159–65. 12. Murthy BV, Ramani N. Evaluation of natural smile: Golden proportion, RED or Golden percentage. → J Conserv Dent. 2008 Jan;11(1):16–21. 13. Freedman GA. Contemporary Esthetic Dentistry. 1st ed. → St. Louis: Mosby/Elsevier; 2012. 461 p. 14. Denry I, Holloway JA. Ceramics for dental applications: a review. → Materials (Basel). 2010 Jan;3(1):351–68. Journal of Oral Science & Rehabilitation Volume 3 | Issue 4/2017 47