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ePaper created 2015-09-09, 12:07:54 | version 1.38.0
I industry report _ composite restorations 550 MPa. The total elasticity of the dental prosthe- sis helps to distribute the selective masticatory strain and to reduce the stress on the implant, bones, joints and antagonists. The physics of the natural tooth are mimicked. This is of benefit for patients with temporomandibular joint dysfunc- tion or bruxism, as well as any other patient. Additionally, the cost factor has proven favou- rable for the patient, the office and the laboratory. Should it be necessary to make an adjustment or repair, this can be done in the patient’s mouth. The veneer composite is light cured. This has shown to bepositiveforthelaboratory,asitmeansthatthere are no additional outlay costs after acquiring a CAD/CAM system. Furthermore, there is no shrink- age, unlike with zirconium dioxide, and this means it is easier to achieve a perfect fit. The colour also reflects the final result right from the start: unlike with ceramic restorations, the colour does not changeduringthemanufacturingprocess.However, the tooth surface appears like ceramic and solid, very similar to the natural tooth. All these proper- ties make the bionic restoration a straightforward, reproducible,aestheticandeconomicalapplication. _Concluding remark: “It doesn’t rattle anymore!” Patients greatly appreciate the natural appear- ance without the masticatory feeling of ceramic andspecificallyofzirconiumdioxide.Inthefollow- ing final example, a zirconium dioxide piece in the mandible was extended using a bionic restoration: a full restoration of the mandible with 13 crowns on eight implants and five natural stumps (Figs. 21 &22).Inthiscase,chippinghadbeenaproblembe- fore. The patient felt comfortable with the bionic restoration. He reported that the new restorations were not as hard and instead felt like his own teeth. The restorations have a “nice soft feel” and “Itdoesn’trattleanymore!”hesummeduphappily._ The report was first published in Dental Barometer, issue 3/15, page 40–42, Barometer Verlagsgesellschaft mbH, Leipzig/Germany _Reference 1. Hämmerle CH,Wagner D,Bragger U,LussiA,KarayiannisA, Joss A, et al. Threshold of tactile sensitivity perceived with dental endosseous implants and natural teeth. Clin Oral Implants Res 1995; 6:83–90. 46 I CAD/CAM 3_2015 Dr Christian Jerecinski is a dentist with an MSc in Implantology and an MSc in Oral Surgery and Implantology. Reinhild Schmidt is a dental technician. Manuela Bandl is a dental technician. Praxis Jerecinski Lichtenturmweg 43,33100 Paderborn,Germany praxis@jerecinski.de,www.jerecinski.de CAD/CAM_authors Fig. 21 Fig. 22