Biomedical subjects
Publications and source records attributed to Avishai Sadan.
Chairside CAD/CAM restorations offer aesthetic, functional, biocompatible, and long-term successful alternatives to traditional materials and techniques, and can be fabricated in one appointment. Adhesive cementation is key for the long-term clinical success of CAD/CAM inlays and onlays. The clinical use of a newly developed composite resin cement for adhesive cementation of CAD/CAM inlays/onlays has been described.
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Many clinicians consider the prosthetic restoration of missing posterior teeth by means of a 5-unit fixed partial denture with a pier abutment a non-favorable situation. The present article assesses the validity of the pier abutment by means of a critical review of the literature and mathematical analysis of the forces generated within a fixed partial denture of this design. Few studies are available, and none substantiate the theory that the pier abutment serves as a fulcrum. A mathematical model suggests that debonding may occur in the anterior abutment, but not due to the teetering of the fixed partial denture around the pier abutment.
Crown-to-root ratio is intended to serve as an aid in predicting the prognosis of teeth. However, controversy persists as to its impact on diagnosis and treatment planning. This article critically reviews the available literature on the crown-to-root ratio assessment and criteria for evaluation of abutment use of periodontally compromised teeth. A Medline search was completed for the time period from 1966 to 2003, along with a manual search, to locate relevant peer-reviewed articles and textbooks published in English. Key words used were "crown-to-root ratio," "periodontal compromised dentition," "mobility," and "biomechanics." There was a dearth of evidence-based research on the topic. Although the use of the crown-to-root ratio in addition to other clinical indices may offer the best clinical predictors, no definitive recommendations could be ascertained.
OBJECTIVES: This study evaluated the ability of a new polyvinyl siloxane impression material (Affinis, Coltène/Whaledent, material A) to obtain final impressions free of bubbles and voids for indirect fixed cuspal-coverage restorations. The results were compared to a control polyvinyl siloxane impression material (material B). Both materials were handled by inexperienced clinicians (undergraduate dental students) in student clinics. METHOD AND MATERIALS: One-hundred and thirty patients who were treated in the Louisiana State University School of Dentistry Junior Student Clinic for indirect fixed cuspal-coverage restorations and who met the inclusion criteria were randomly assigned to either one of two treatment groups, group A (n = 65) or group B (n = 65). Two calibrated examiners evaluated the first impression of prepared posterior teeth at a magnification of 10x for acceptability (no voids or bubbles). Position of tooth, type of preparation, preparation finish line (Class I-V), and gingival bleeding scores were recorded. All statistical tests were performed with the level of significance set at .05. RESULTS: The Fisher-Freeman-Halton test did not reveal significant associations between material and gingival bleeding score (P = .492). Significant differences in the location of the preparation finish line between materials were observed (P = .0096); material A was more frequently used in cases where the preparation finish line was located at least 2 mm subgingivally. Logistic regression was used to assess the effect of the material on the success of the impression (acceptable/ unacceptable). Material was highly significant in the logistic model (P < .001) with an odds in favor of an acceptable impression being eight times higher with material A than with material B (odds ratio = 8.00; 95% confidence index for odds ratio: 2.832, 22.601). The 60/65 (92.3%) impressions made with material A and 39/65 (60%) impressions made with material B were rated "acceptable." CONCLUSION: The new polyvinyl siloxane impression material provided a significantly higher proportion of impressions free of bubbles and voids than the control polyvinyl siloxane material.
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Densely sintered alumina- and zirconia-based restorations were introduced to dentistry in the early 1990s and became a popular treatment modality, especially in situations requiring complete-coverage restorations. The use of industrial technologies for the fabrication of the restoration, simple clinical management, and pleasing esthetic outcome have made these restorations an attractive treatment alternative. This article reviews the nature of the materials used and the technologies involved and provides indications for clinical case selection and tooth preparation.
Part 1 of this series provided the foundation for understanding the nature of densely sintered alumina- and zirconia-based restorations, provided guidelines for case selection, and addressed framework design considerations. This article discusses guidelines for lamination of the densely sintered alumina- and zirconia-based restorations and proper try-in, and examines options for conventional and adhesive luting procedures.
VPS impression materials that contain a surfactant cannot be considered as hydrophilic, rather they are probably less hydrophobic. More VPS products that contain surfactants are expected to be introduced to the market. It is yet to be proven that surfactant-containing VPS materials have a better wettability than polyether-based impression materials. The current data still indicates that polyethers are more hydrophilic. The less hydrophobic behavior of the surfactant-containing VPS may provide a significant advantage in clinical practice. Due to this advantage, the author suggests that clinicians using VPS as their preferred elastomeric impression material should consider switching to surfactant-containing VPS impression materials.
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The replacement and restoration of missing single teeth with dental implants are routine procedures. However, because of the relatively short clinical history of this procedure in dentistry, custom-tailored protocols for this procedure do not exist. This article will outline the various surgical and restorative steps involved in the treatment planning, fabrication, and delivery of single-implant restoration, and will critically analyze the existing clinical concepts and provide recommendations based on a contemporary approach. As data for and experience with this procedure increase the same general guidelines for all types of implant restorations may not apply. Emphasis will be placed on differentiating between the various types of single-implant restorations, comparing and contrasting the differences between the different types of single-implant restorations, and revising some of the existing concepts of this treatment modality.