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ePaper created 2015-09-09, 12:07:54 | version 1.38.0
I technique _ veneering options _An introduction to techniques and materials The combination of advanced materials and manu- facturing techniques makes the industrial production ofprostheticcomponentspossibleforeveryclinicalsit- uation.Wherejustadecadeagoonlysinglecopingscould be manufactured, today we are seeing manufacturing versatility that allows not only single abutments, but multi-unitframeworksontheimplantorabutmentlevel. The NobelProcera System guarantees unrivalled product quality for almost any patient situation. No other CAD/CAM system has such a celebrated heritage, stemming from decades of experience in producingthehighestqualitymulti-unitframeworks for both natural teeth and implants. When compared to conventionally fabricated frameworks, CAD/CAM frameworks demonstrate decisively distinctive advantages, including material homogeneity,customiseddesignoptions,andeaseof fabrication. Industrial production also guarantees uniform high quality and consistent cost-efficiency by reducing labour-intensive work in the dental laboratory along with its related costs. Scientific data confirms that material incompati- bilities between cast and machined components can beminimisedoreliminatedwhentitaniumorzirconia are used. Corrosive phenomena at the interface be- tween dissimilar metal alloys can thus be prevented while facilitating precision fit at the same time. This approach also promotes soft tissue stability and marginal bone maintenance. Crucialchoices Inordertoensurelongevitywhenrestoringaneden- tulouspatientwithanimplant-retainedrestoration,the selection of proper materials, prepared with appropri- ateprecision,isvital.Whattheidealprotocolforfinish- ing/veneering CAD/CAM frameworks entails has been _Case 1 (Images courtesy of Dr D’Avenia et al.) Figs. 1a & b_The initial intraoral situation: a 20+ year old prosthesis with which the patient presented at the first consultation visit (a), and the same situation without the dentures, clearly showing the loss of hard and soft tissue architecture (b). Veneering options for fixed implant-retained restorations Author_ Prof. Stefan Holst 36 I CAD/CAM 3_2015 Fig. 1a Fig. 1b For conventional veneering,three general techniques can be used to achieve aesthetics and function: _The conventional hand layering technique is the most frequently used method, which generally results in a good aesthetic outcome and proper morphologic contouring. However, the specific skills and experience of the technician have a significant impact on the overall outcome and quality of a restoration utilising this technique. A manual process, hand layering can sometimes be uncharitably characterised by its lack of standardisation. _The ‘press technique’ is an alternative method that reduces operator-induced errors such as cracks, air trapping, etc., and ensures a more homogenous material microstructure. With this technique, a full anatomical contour is waxed, invested, and the ceramic material is pressed onto the framework. _Full anatomic milling from a homogenous glass-based ceramic or acrylic block material utilising CAD/CAM technologies is the third option. This method produces optimal material microstructure due to its use of high-quality block specimen and the complete elimination of manual manipulation.