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ePaper created 2014-11-20, 16:14:55 | version 1.30.01
I 13 industry report _ CAD/CAM material I CAD/CAM 4_2014 This newly developed material is a combi- nation of highly durable plastic and zirconium dioxide, which principally combines the positive features of both material groups: the acrylic con- tent ensures a certain elasticity to the material which ideally imitates the natural elasticity of the periodontium. This is particularly beneficial with implant treatments for ensuring an even distribution of chewing forces. The addition of zirconium dioxide improves the mechanical strength of the restoration and ensures an optimal abrasion stability without the risk of exposing the antagonist to excessive forces. The case report presented in this article is an example of the difficulties encountered when treating patients suffering from parafunctions. _Case report The 55-year-old patient made a dental ap- pointment, having noticed a sharp edge for quite some time by his implant crown in the upper jaw, region 15, which had been there for quite some time. The clinical examination concluded that there was a fracture in the metal-ceramic implant‘s palatal veneering. Furthermore, the patient appeared to have noticeable evidence of grinding on the majority of teeth. When asked, the patient admitted to grinding and pressing his teeth, particularly at night. The implant had been inserted in July 2010 and indicated an inconspicuous percussive res- onance with no signs of a peri-implant infection. A x-ray was carried out as a safety precaution and similarly showed no pathological findings. It was discussed together with the patient that a new implant crown should be fitted, using a material better suited to the patient. At this point, the option of a new, innovative material came to mind: a highly durable acrylic, reinforced with zirconium dioxide (Tizian Zirconia Reinforced Composite, Schütz Dental). Afterthefracturedcrownhadbeenremoved,the situation was as follows with uninflamed mucosa: Fig. 6_Scanned model with simulated abutment. Fig. 7_Finished crown with antagonist construction. Figs. 8 & 9_Finished restoration on the master model. Fig. 7 Fig. 6 Fig. 9Fig. 8 CAD0414_12-14_Kollmuss 14.11.14 13:34 Seite 2 CAD0414_12-14_Kollmuss 14.11.1413:34 Seite 2