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detailed occlusal anatomy picked up by high-flow VPS bite registration materials is not replicated by alginate, thus not allowing the bite registration to seat accurately on the alginate-derived stone model (Figs. 7, 8). If the clinician decides to continue using alginate impressions to generate opposing models, a lateral closed-bite registration is a better choice (Figs. 9, 10). ALGINATE SUBSTITUTES Alginate substitutes (Table) are essentially low-cost VPS materials that demonstrate all the favorable characteristics previously established for materials of the VPS category. Dr. Gordon Christensen 31 has described these alginate substitutes as accurate, clean to use, and with no unpleasant taste or odor (Fig. 11). Furthermore, the addition silicones (VPSs) have been shown to be very accurate and dimensionally stable; stable enough to pour after a delay of time or when making additional pours of the same impression. 2,32 Additionally, VPSs have higher tear strength than alginates (an important feature when they are poured multiple times), and are minimally affected by disinfection techniques. 33,34 In using a VPS alginate substitute with a VPS bite registration and a working model derived from a VPS impression, mismatches that occur when using casts derived from alginate impressions can be eliminated (Fig. 12). This ensures the casts will be mounted by the dental technician in maximum intercuspation (Fig. 13), which reduces the incidence of Figure 7: Close-up view of an extremely detailed occlusal surface of a mandibular third molar, taken with a VPS bite registration material Figure 8: Same tooth as in Figure 7 as replicated from an alginate impression. Note that it does not capture the detailed deep occlusal anatomy. Figure 9: A lateral (closed) bite registration can be taken if the practitioner uses alginate for the opposing models. Figure 10: The lateral (closed) bite registration, once correctly trimmed, fits on an alginate-derived stone model. 50 www.chairsidemagazine.com
No matter which highly accurate, good flow, stiff, dimensionally stable bite registration material the clinician uses, the untrimmed bite registration will never fit on models derived from alginate. Table: Representative Alginate Substitutes Counter-FIT Algin•X Silgimix StatusBlue Freealgin ® Position Penta Quick AlgiNot CLINICIAN’S CHOICE DENTSPLY Caulk Sultan Healthcare Zenith <strong>Dental</strong>/DMG Zhermack 3M ESPE SDS/Kerr Figure 11: Alginate substitute (Counter-FIT) shows good detail, even after multiple pour-ups Figure 12: Models derived from the alginate substitute accurately fit the bite registration material (Affinity Quick Bite). Figure 13: The registered acquired centric is correctly and accurately replicated in the mounted models. Optimizing Occlusal Results for Crown & Bridge Prostheses51
Page 1: Chairside® A Publication of Glidew
Page 4 and 5: Contents 38 CEREC ® Connect: A Wel
Page 6 and 7: Letters to the Editor Dear Dr. DiTo
Page 8 and 9: Contributors Michael C. DiTolla, DD
Page 10 and 11: Numbers by the An elephant’s mola
Page 12 and 13: Dr. DiTolla’s CLINICAL TIPS PRODU
Page 14: Dr. DiTolla’s CLINICAL TIPS PRODU
Page 17 and 18: Figure 1: Tooth #9 is going to be p
Page 19 and 20: Figure 7: Crowns often look fake in
Page 21 and 22: Figure 15: The prep is essentially
Page 23: Depth cuts ensure that we get enoug
Page 27 and 28: Interview with Stephen Thorne - INT
Page 29 and 30: ST: No, it was definitely the forme
Page 31 and 32: can share a blog. There are many ti
Page 33 and 34: After those steps, Owner Dentists t
Page 35 and 36: dental schools, and I thought that
Page 37 and 38: all the way through retirement. And
Page 40 and 41: CEREC ® Connect: A Welcomed Upgrad
Page 42 and 43: Many CEREC ® dentists find making
Page 44 and 45: Figure 1 Figure 2 CEREC Connect Pro
Page 46: Figure 5 Figure 6 Conclusion CEREC
Page 50 and 51: working stone model of the single p
Page 54 and 55: high occlusion in the final prosthe
Page 56: use a high-flow, stiff (no bounce)
Page 60 and 61: most overlooked esthetic zone 3,4 (
Page 62 and 63: and floss. The facial and lingual p
Page 64: metal designs like the Wynne Hybrid
Page 67: The Chairside® PHOT Hunt Eleven ye

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