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DENTALTRIBUNE Asia Pacific Edition No. 1+2/2015 Trends & Applications 13 functional requirements of the patient. The situation achieved with this rather gradual ap- proach was used as a reference in the subsequent fabrication of the final restoration (Fig. 5). It was then time to select the materials and manufacturing method that would allow the data gathered in the previous processes to be converted into a high-strength aesthetic restora- tion. We opted for the IPS e.max CAD-on technique/IPS e.max CAD Veneering Solutions, as this method allowed for accurate re- productionofthediagnosticwax- up. Dedicated software divides the data into two sets for the pro- duction of the ZrO2 framework and the LS2 veneering structure. The model and the wax-up were both digitalised and imported into the program (Figs. 6a & b). The primary structure (frame- work) was created using ZrO2 according to the CAD/CAM tech- nique. Its accuracy of fit was checked on the model and then the framework was sent to the practice for try-in (Figs. 7–9). The framework showed an ex- cellent fit and did not require any reworking (Fig. 10). Based on the data, the ve- neers were milled from IPS e.max CAD. This secondary structure was easy to adapt to the framework (Fig. 11). Still in their intermediate (pre-crystalline) state, the LS2 veneers were ad- justed to match the pre-existing morphological characteristics. A base for veneering the gingival parts was also created. Contour- ing the artificial gingiva with composite material by a dentist would happen at a later stage. We were now ready for the final stage. After checking the functional and morphological parameters, we joined the ZrO2 framework and LS2 veneer with the IPS e.max CAD Crystall./ Connect fusion glass-ceramic and an Ivomix mixing device (Figs. 12a & b). Crystallisation or fusion firing was conducted in a Programat furnace using a dedi- catedfiringprogram.Afterwards, therestorationwascustomisedto matchthespecificcharacteristics of the patient’s dentition and sub- jectedtoacharacterisation/glaze firing process (Figs. 13 & 14). Completing the restoration After the try-in, the restora- tion was returned to the labo - ratory to add some final touches. A few characterisations were applied according to the given requirements. Those areas of the framework to be veneered with composite were etched to prepare them for the application of the composite material. In the practice, the gingival parts were reproduced using gingiva- coloured composite with the temporary as a guide (Fig. 15). A natural-looking gingiva shield was achieved by applying the material in small quantities in several steps. Finally, the all- ceramic bridge was seated using conventional procedures. The result was a restoration that blended in so well that it could hardly be distinguished from thesurroundingnaturaldentition (Figs. 16 & 17). Chipping of the veneering ceramic on ZrO2 frameworks can often be traced back to a failure to observe the material-specific technical requirements. By using the CAD-on technique described in this report, the risk of failure can be minimised for these kinds of restorations, because the strengthoftheveneeringceramic used with this technique is four to five times higher than that of con- ventional veneering ceramics. The high strength of the ceramic has been confirmed in a study that compared bridges manufactured using the CAD-on technique with ZrO2 bridges veneered using an individual layering technique.1 The results of the study showed that the strength of the CAD-on bridges was twice as high (2,188 ± 305 N) as the strength of conventionally veneered bridges. In this case, accurate diag- nostic measurements taken at the preoperative stage, in-depth knowledge of the materials in- volved in the treatment process, andexcellentcollaborationledto a highly aesthetic result without the need for surgical interven- tion. The procedure ideally com- bines two outstanding materials and has proven to be both reli- able and cost-effective. Acknowledgement: This case was conducted in collaboration withdentaltechnicianPaoloVigiani and Dr Leonardo Bacherini from Florence. I would like to thank them both for their support. Reference 1 Tauch, D. & Albrecht, T., “In vitro- Festigkeitsprüfung von viergliedrigen Brücken: Die CAD-on-Technik, Teil 3”, Das Dental Labor, 58/12 (2010), 16–23. DT The 36th Australian Dental Congress Brisbane Convention and Exhibition Centre - an AEG 1EARTH venue Wednesday 25th to Sunday 29th March 2015 Invitation from the Congress Chairman On behalf of the Local Organising Committee of the 36th Australian Dental Congress, it is with great pleasure that I invite you to attend Congress and enjoy the river city of Brisbane. Over three and a half days, highly acclaimed International and Australian speakers supported by contemporary research, will present a wide range of subjects relevant to practice. These presentations will be complimented by hands on workshops, Lunch and Learn sessions, specific programmes for members of the dental team. Social activities will be available for relaxation purposes. The Brisbane Convention and Exhibition Centre is adjacent to the Southbank Precinct on the banks of the Brisbane River. Nearby is the Queensland Performing Arts Complex, the Queensland Museum and the Queensland Art Gallery and Gallery of Modern Art. A comprehensive industry exhibition will be held alongside the Congress enabling delegates access between scientific sessions to view the latest in equipment and materials. Come and join us for the scientific programme, the opportunity to meet colleagues and the experience Brisbane has to offer. Dr David H Thomson Congress Chairman 36th Australian Dental Congress Educating for Dental Excellence facebook.com/adacongress twitter.com/adacongress youtube.com/adacongress adc2015.com Titanium sponsor: AD Massimiliano Pisa isadentaltechni- cian at the Den- talGigliolabora- tory in Florence in Italy. He can be contacted at maspis@me.com. Contact Info DTAP0115_12-13_Pisa 09.02.15 11:00 Seite 2 DTAP0115_12-13_Pisa 09.02.1511:00 Seite 2