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19. Case of the Month – Rapid Smile Makeover: A Pictorial Essay
Long term research data on dental porcelain veneers have demonstrated the need to retain as much enamel as possible during the preparation phase. With this in mind, the preparation process has evolved through 3 distinct generations. 1) Arbitrary controlled depth cuts of the remaining tooth substance: but this inevitably extends through to dentin creating potential predictable long term bonding issues. 2) Wax up the desired new tooth form extending slightly labially (0.25mm) and develop silicone indices/matrices to evaluate controlled intra-enamel preparation relative to new position- ing of teeth: a good system but time consuming and complex. 3) Use of a wax up and silicone stent to develop a trial smile directly in the mouth: allows evaluation of function and esthetics.
27. Case Reports Describing The “Bump”: A New Phenomenon in Implant Healing
This article presents 28 cases demonstrating a phenomenon that will be termed the “Bump”. Historically, implants have seen an early decrease in their stability as healing progressed from primary mechanical stability to biologic bone remodeling and formation better known as osseointegration. The lag between the predominance of biologic over mechanical stability has been termed the dip. This can be quantitatively measured by resonance frequency analysis (RFA) where the implant stability quotient (ISQ) values decrease with time from those seen at placement until osseointegration causes an increase back to and quite possibly greater than those initially measured.
41. “Toronto” Screwed Mandibular Overdenture on Dental Implants: FEM and Von Mises Analysis of Stress Distribution
Background: The aim of this work was to analyze how different distributions of chew- ing load could be related to dental prosthesis fractures of the Toronto restoration via a virtual parametric model. We also investigated implant positions and perspectives in comparison with a virtual medial plane, to evaluate the incidence of screw and prosthesis breakage.