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ePaper created 2015-03-06, 14:42:46 | version 1.33.01
I 17 CE article _ biomechanical principles I CAD/CAM 1_2015 lacks retention and resistance form is elimi- nated. In addition, it has been shown that patients prefer a digital impression technique in lieu of the traditional impression method.9–13 Yuzbasioglu, et al (2014), also determined that the digital impression method was faster than the traditional method. This finding was also verified by Patzelt, Lamprinos, Stampft and Att (2014), who indicated that workflow efficiency was improved using a digital impression tech- nique. _Case report This patient presented for restorations of teeth #3 and #4 (Fig. 1a). Because of the size of the existing restorations, these teeth were diagnosed as structurally compromised (Figs. 1b, c). The prog- nosis without treatment was fair. The restorations were to be completed with PlanScan chairside CAD/CAM technology in the same visit. Local anesthesia was achieved with 1.7 cc 2 per cent Lidocaine with 1:100,000 epi, buffered with Onset sodium bicarbonate inj., 8.4 per cent, USP neutralizing additive solution. Depth guide cuts were made using a 330 bur, which has a 2 mm cutting surface (Figs. 2a–3b). This ensures 2 mm of occlusal reduction to accom- modate 2 mm of material thickness on the occlusal surface of the restoration. Gross occlusal reduction was completed using a KS7 bur to the depth cuts (Figs. 4–8b, 9c). Adequate Fig. 26k_Checking material thickness of #4 in facial view. Fig. 26l_Using rubber tooth tool to adjust the anatomy of #4. Fig. 26m_Using rubber tooth to adjust the distofacial cusp height of #3. Fig. 26n_Using rubber tooth tool to adjust the distal marginal ridge height of #4. Fig. 26o_Using smooth tool to smooth the facial of #3. Fig. 26p_Using smooth tool to smooth the facial of #3. Fig. 26q_Checking occlusal contacts, location and strength, #3. Fig. 26r_Checking interproximal contact strength #4. Fig. 26s_Final restorations, occlusal view in PlanScan. Fig. 26s Fig. 26p Fig. 26jFig. 26h Fig. 26i Fig. 26k Fig. 26l Fig. 26m Fig. 26n Fig. 26o Fig. 26q Fig. 26r CAD0115_12-21_Young 02.03.15 12:39 Seite 6 CAD0115_12-21_Young 02.03.1512:39 Seite 6