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ePaper created 2015-11-12, 17:51:56 | version 1.38.0
industry report _ Digital Denture: Description of the procedure I denture base are created for manufacturing in the CAM unit, the CAD software automatically computes an additional transfer template that depicts the occlusal surfaces and incisal edges of the maxillary and mandibular teeth (Fig. 11). This information is then fed into the CAM software to mill the dentures in the Zenotec select ion milling unit. If conventional methods are used, the den- ture teeth often have to be manually reduced at the basal surface using a handheld grinder, because the vertical dimension between the maxillary and mandibular teeth is in many cases too short. The CAD/CAM manufacturing process ad- dresses this situation by cutting two reposition- inggroovesintotheIvoBaseCADforZenotecdisc. As a result, the disc can be secured only in one po- sition using an especially designed disc holder. Then, in the first milling run, the denture base is milled from the top surface to its final shape including the holes for the placement of the physical teeth. After that, the disc is removed. The pre-fabricated denture teeth are polymerised to the denture base using IvoBase CAD Bond and thetransfertemplatecomputedandpreparedbe- forehand(Fig.12).Thetransfertemplateisusedto verify the correct placement of the teeth. To con- ductthesecondmillingrun,thistimeonthebasal surface,thediscisagainsecuredtothedischolder in exactly the same position as before (Fig. 13). Now,ifindividualteethturnouttobetoolong,the excess will be ground away during the second milling run. The result of the milling process is a CAD/CAM denture that can be polished to a high gloss using familiar methods. _Fourth step—Clinical Incorporating the final dentures is carried out in the same way as the incorporation of conven- tional dentures (Fig. 14). Particularly noteworthy is the excellent basal fit of the dentures. As the manufacturing process is not affected by polymerisation shrinkage or any other thermal influences and results in the precision typical of CAD/CAM methods, the dentures exhibit an exceptional accuracy of fit and provide an out- standing suction effect. _Outlook The trend towards digitisa- tion is not a new or unknown phenomenon in dentistry. Digi- tal technology has started to make inroads into fixed dental prosthetics several years ago and has advanced successfully. Itwasthereforeonlyaquestion of time until it would also start to gain a foothold in removable prosthetics.TheDigitalDenture process may represent an es- sential milestone in the ad- vance of dental technology in fixed prosthetics. And this trend is said to continue: addi- tional indications will advance the modernisation of remov- able prosthetics and the effi- ciency of the manufacturing processes will be consistently optimised._ Fig. 12_The positioning jig allows the denture teeth to be easily placed in the holes milled for the physical teeth. An inspection window allows the user to check if the teeth are placed firmly in their position. Fig. 13_The disc holder is especially designed to ensure precise repositioning of the disc for the final milling process. Fig. 14_CAD/CAM-fabricated custom-made dentures: harmonious integration into the patient’s overall aesthetic appearance. I 33CAD/CAM 4_2015 Ivoclar Vivadent Bendererstrasse 2 9494 Schaan Liechtenstein www.ivoclarvivadent.com/en/wieland-digital-denture CAD/CAM_contact Fig. 13 Fig. 14 Fig. 12 CAD0415_30-33_Ivoclar 06.11.15 12:01 Seite 4 CAD0415_30-33_Ivoclar 06.11.1512:01 Seite 4