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CE article _ mastering occlusal function I potential interferences that were not present with the prior failing restoration. It is truly the best of both worlds to establish anatomy and determine occlusion in the digital world. _Case 3 An onlay was necessary for tooth #30 after recurrent caries of a large amalgam. Prior to prepa- ration, preoperative images were taken for the BiogenericCopymodel.Thetoothwaspreparedand three sets of images were then taken: preparation quadrant, opposing quadrant and buccal bite im- ages. The software now had everything required to calculate the restoration. The upper and lower digital models were articu- latedusingthebuccalbiteimagesandthelowerBio- genericCopymodelwasautomaticallysplicedtothe lower preparation model. The margin was marked and the Biogeneric calculation took place (Fig. 24). TheocclusalcontactsoftheBiogenericproposalap- peared to be correct; but after comparing it to the preoperativeBiogenericCopymodel,itrevealedthat there was an interference along the incline plane of the buccal cusp. So, this area was relieved (Fig. 25). However, the Biogeneric proposal actually calcu- lated a better position for the distal marginal ridge and it was left as designed. The prior amalgam was deficient in height at the marginal ridge. The digital restoration was milled out of IPS e.max CAD (Ivoclar Vivadent) and crystallized. The restoration was bonded in with Multilink Automix (IvoclarVivadent)andnoocclusaladjustmentswere required (Fig. 26). _Conclusion ThenewestCERECSoftware4.0hasopeneddoors that were only dreams years ago: better flow, more efficient tools, multiple models and multiple-unit design.Havingtheabilitytodesignmultiplerestora- tionsinunisonhasgreatlyincreasedthedesignmode. It has a major impact when designing any adjacent restorations, but it is phenomenal at the midline be- tween teeth numbers 8 and 9. The esthetic position of the midline is achieved easily because of this. Esthetic dental anatomies are also easier to achieve with the ability of the software to calculate exceptional designs that are customized for every tooth. But the function does not suffer because the design can be compared to a preoperative shape, as well as the intermaxillary space. This makes for a very efficient method in achieving proper occlu- sion digitally and ultimately in the final restoration delivered to the patient._ _References 1.Ender A, Mörmann WH, Mehl A. Efficiency of a mathe- maticalmodelingeneratingCAD/CAM-partialcrownswith natural tooth morphology. Clin Oral Investig. 2011 Apr; 15(2):283-9.Epub2010Feb9. 2.DunnM.BiogenericandUser-Friendly: TheCEREC3DSoft- wareUpgrade3.00. IntJComputDent.2007;10(1):109–117. 3.Richter J, Mehl A. Evaluation for the full automatic inlay reconstruction by means of the biogeneric tooth model. IntJComputDent. 2006;9(2):101–111. 4.Mehl A, Blanz V. Biogeneric tooth reconstruction—new fundamental method to describe and reconstruct the occlusal morphology of teeth. In: Mormann WH, ed. State of the Art CAD/CAM Restorations. Hanover Park, Ill: Quint- essencePublishingCo;2006:113–121. 5.Fasbinder DJ, Poticny DJ. Accuracy of occlusal contacts for crownswithchairsideCAD/CAMtechniques. IntJComput Dent.2010;13(4):303–16.English,German. Fig. 26_The digitized occlusion was completed with anticipation of a glaze layer. The final restoration did not require any adjustment. I 13cosmeticdentistry 4_2012 Dr Todd Ehrlich graduated Magna Cum Laude from UTHSC at SanAntonio and served as president of itsAlumniAssociation. His“CERECOLOGY”advanced training program is considered one of the premier training seminars for CEREC.He is a beta tester for Sirona, and is an administrator on Dentaltown’s website. He can be contacted at drehrlich@cerecology.com. _about the author cosmeticdentistry Fig. 26