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CAD/CAM - international magazine of digital dentistry

10 I I CE article_ Tempcap abutment thesis fracture, required CAD design modifi- cations. Reiterations in CAD/CAM design were carried out until a successful restoration was achieved (Fig. 17). The unfired IPS e.max crown was tried for fit and aesthetics and then subsequently fired (Fig. 18), resulting in its colour change. The crown was further stained, glazed and fired (Fig. 19), result- ing in a highly aesthetic final restoration (Fig. 20). The restoration’s internal aspect (Fig. 21) was assessed for path of insertion, retention and fit. The IPS e.max prosthetic crown was further assessed for fit, taking into account marginal fit, occlusion and proximal contacts (Fig. 22). A secondary investigation utilized a more complex Tempcap to assess the limit of the CAD/CAMunit’scapability.Astand-aloneAnkylos (DENTSPLY Implants) implant body was coupled with a Tempcap abutment with three retentive pin projections (Fig. 23). The abutment was digi- tized with the same methodology as described. An IPS e.max crown was executed and assessed (Figs. 24 & 25). _Discussion This study has determined that the Tempcap can be successfully and accurately digitized and milled by in-office CAD/CAM technology (Editorial note: Planmeca E4D Technologies) to create an ideal prosthetic crown from IPS e.max within a laboratory setting. CAD software can be manipulated to generate forms beyond the scope of the unit. Complex units, such as the three-pronged Tempcap may be successfully designed and milled. IPS e.max has the capability to be milled in complex patterns, while still maintaining its structural integrity. However, further laboratory studies, quanti- tatively assessing stresses and strengths and utilizing a larger sample size, are required to validate the concept. Subsequent clinical in- vestigations are required to assess the clinical significance and viability of the Tempcap with CAD/CAM technology. The potential to fabricate the Tempcap entirely from e.max should also be considered. Fig. 21_Internal aspect of restoration. Fig. 22_Final CAD/CAM IPS e.max restoration. Fig. 23_Ankylos implant with complex Tempcap and milled IPS e.max crown. Fig. 24_Internal aspect of IPS e.max crown for three-pronged Tempcap. CAD/CAM 3_2014 Fig. 24Fig. 23 Fig. 22Fig. 21 CAD0314_06-11_Kalman 22.08.14 14:00 Seite 5

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