Soft-tissue maintenance techniques: optimal esthetics without periodontal plastic surgery.
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Adult↗
Biomedical subjects
B J Crispin
Publications and source records attributed to B J Crispin.
Dental luting agents: A review of the current literature.
STATEMENT OF PROBLEM: The practice of fixed prosthodontic has changed dramatically with the introduction of innovative techniques and materials. Adhesive resin systems are examples of these changes that have led to the popularity of bonded ceramics and resin-retained fixed partial dentures. Today's dentist has the choice of a water-based luting agent (zinc phosphate, zinc polycarboxylate, glass ionomer, or reinforced zinc oxide-eugenol) or a resin system with or without an adhesive. Recent formulations of glass ionomer luting agents include resin components (resin-modified glass ionomers), which are increasingly popular in clinical practice. PURPOSE: This review summarizes the research on these systems with the goal of providing information that will help the reader choose the most suitable material. MATERIAL: The scientific studies have been evaluated in relation to the following categories: (1) biocompatibility, (2) caries or plaque inhibition, (3) microleakage, (4) strength and other mechanical properties, (5) solubility, (6) water sorption, (7) adhesion, (8) setting stresses, (9) wear resistance, (10) color stability, (11) radiopacity, (12) film thickness or viscosity, and (13) working and setting times. In addition, guidelines on luting-agent manipulation are related to available literature and include: (1) temporary cement removal, (2) smear layer removal, (3) powder/liquid ratio, (4) mixing temperature and speed, (5) seating force and vibration, and (6) moisture control. Tables of available products and their properties are also presented together with current recommendations by the authors with a rationale.
Dental Cements↗
CEREC II: CAD-CIM for the twenty-first century.
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Ceramics↗
The full veneer as an alternative to the full crown.
The use of ceramic veneers on the facial and incisal surfaces of teeth has become an integral part of our esthetic armamentarium. The success rate on these restorations has led to increased optimism and expanded applications. The full veneer uses bonded ceramic veneers to restore additional tooth surfaces. The result is a highly esthetically pleasing restoration that is functional and very conservative compared with traditional crowns.
Crowns↗
Full veneers: the functional and esthetic application of bonded ceramics.
Esthetic restorative practices have used bonded ceramic facial veneers to replace or augment defective, discolored, or missing enamel. These restorations have proved to be highly esthetic and extremely durable. Sometimes it is necessary to extend the veneers onto occlusal, lingual, or proximal surfaces to cover defective tooth structure. This article will define "full veneers," present indications, show preparation designs, and present clinical cases where full veneers have been used.
Dental Bonding↗
Expanding the application of facial ceramic veneers.
"Full veneers," restorations similar in depth to ceramic veneers but extending over the lingual or occlusal surface as well as the facial surface, are a conservative option to conventional crowns. They have been used successfully at the UCLA Center for Esthetic Dentistry for three years. Indications, technique and a patient study are presented.
Dental Cavity Preparation↗
Resin bonding to various substrates.
The use of bonding adhesive techniques in dentistry in general and in esthetic dentistry in particular has expanded significantly. As techniques, materials, and results improve, adhesive procedures are substantially modifying many traditional approaches to treating dental problems. More esthetic and less invasive techniques are becoming routine as adhesive materials and techniques become tested and understood. This paper reviews several important areas that affect our understanding and application of adhesive dentistry. With the many material categories, materials in categories, and varieties of bonding surfaces, the subject is extremely complicated. An attempt has been made to divide the past year's literature into sections and to review each section as a separate component of this complex subject.
Acrylic Resins↗
Computerized design and manufacturing of esthetic dental restorations.
The "high-tech race" in restorative and esthetic dentistry is underway. The Cerec System, which currently leads the race, is reviewed. Other systems, which soon will be available, are discussed briefly. New and innovative technologies are sure to become a significant part of dentistry, both today and in the future. Many traditional methodologies and materials will be replaced by these new developments.
Ceramics↗
Effect of different metal ceramic alloys on the color of opaque and dentin porcelain.
Certain metal ceramic alloys alter the final color of bonded porcelain. Contradicting results, inconsistent test designs, and incomplete alloy selections have led to some confusion. In this study, differential colorimetric analysis was done at the opaque and dentin porcelain stages with five major types of metal ceramic alloys. The color stability of the porcelain on the high-noble metal alloys was found to be excellent. The palladium-silver and nickel-chromium alloys resulted in significant color changes of the dentin porcelain only. The greatest changes in color were found with the palladium-silver alloy, which resulted in a higher yellow-green saturation. The nickel-chromium alloy also produced a color change, although not as severe, resulting in a porcelain shade with a reduced Value or lightness.
Chromium Alloys↗
A longitudinal clinical study of bonded fixed partial dentures: the first 5 years.
Etched-metal, composite resin-bonded, fixed partial dentures, as described in the early 1980s, gained an immediate application and popularity in restorative dentistry. This initial report presents the results of the first 5 years of a 10-year longitudinal study of these restorations. A total of 71 fixed partial dentures, ranging in use from 13 to 65 months, that were placed at the University of California, Los Angeles, School of Dentistry using consistent design parameters and restorative techniques have been analyzed. The results of this initial report indicate: (1) bonded fixed partial dentures are technique-sensitive; (2) optimal success requires meticulous attention to procedural detail; (3) anterior bonded fixed partial dentures do not appear to need routine 180-degree-plus circumferential retainer preparation for predictable success; (4) posterior bonded fixed partial dentures appear to require 180-degree-plus circumferential preparation for predictable success; (5) for single-tooth posterior replacements or single-to-double tooth anterior replacements, bonded fixed partial dentures are a viable alternative to conventional fixed partial dentures when intact abutments exist; and (6) most failures occurred within the first year.
Appointments and Schedules↗
Relative color stability of ceramic stains subjected to glazing temperatures.
Ceramic stains are routinely used to modify Hue or characterize ceramic dental restorations. Subjective opinion has led to the hypothesis that certain stains are not color stable when subjected to glazing temperatures. This study tested the individual stains in nine different ceramic staining kits for color stability when subjected to glazing temperatures. Ceramic disks were made with gingival porcelain and coated with individual stains. Colorimetric recordings were made before and after glazing and the color difference (delta E) was calculated. Significant color changes were noted for specific individual stains from each of the ceramic staining kits tested.
Ceramics↗
Effect of porcelain crown substructures on visually perceivable value.
Factors that will affect the potential color of ceramic restorations must be understood to control variables that exist. Clinical observations of porcelain restorations lead to the hypothesis that certain substructures tend to produce crowns with a lower than expected Value (brightness). This study was done to determine whether a visually perceivable difference could be detected between groups of ceramic crowns with different substructures. Two test groups of crown types with four different porcelain substructures were compared. In the first group, metal ceramic crowns made with either Galaxy or Rexillium III alloys were compared. In the second group, aluminous porcelain jacket crowns with and without a tin-plated, bonded platinum foil internally were compared. Visual analysis showed that (1) in the metal ceramic group, the crowns with the Rexillium III substructure were scored as more often having a lower significant Value, and (2) in the aluminous porcelain jacket group the crowns with the tin-plated, bonded platinum substructures were scored as more often having a lower significant Value.
Binomial Distribution↗
Success of etched-metal bonded retainers with nonrigid connections: a clinical study.
The use of etched-metal bonded retainers in combination with conventional fixed retainers has been described in the literature. This design creates several potential problems that can be overcome by the use of an etched-metal bonded retainer with a nonrigid connector as described in this article. Also presented are the preliminary results of a clinical study of 25 restorations that had been in place 13 to 45 months (average 22 months). The preliminary results are encouraging. No failures have been recorded to date (September 1987).
Acid Etching, Dental↗
Evolution of the matrix for Class 2 restorations.
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Dental Instruments↗
Margin placement of esthetic veneer crowns. Part IV: Postoperative patient attitudes.
Ninety-one subjects with a total of 196 esthetic veneer crowns with visible gingival margins were surveyed. An esthetic analysis of crown margins showing with a normal smile and an exaggerated smile was performed and recorded. Patient satisfaction or dissatisfaction with the esthetic veneer crowns was assessed. The conclusions of this study support the results reported in the first three parts of this study, indicate that satisfactory results can be obtained on many individuals when the crown margins of esthetic veneer crowns are placed supragingivally, and support the philosophy that individual patient education and analysis are essential to the selection of optimum margin placement when esthetic veneer crowns are the treatment of choice.
Attitude↗
Esthetic mouth preparation for ceramic restoration.
At the beginning of this article, we asked the question "Is there a problem?" The answer to this question is yes, but at different levels for individual dentists and individual treatment situations. Adequate esthetic mouth preparation for ceramic restorations requires far more than tooth preparation. This article has outlined the major areas of concern. Readers must recognize areas of individual need and explore them in greater detail in the dental literature. It is hoped that this article has stimulated readers to learn more about esthetic moth preparation for ceramic restorations.
Crowns↗
Silver-plated dies. Part II: Marginal accuracy of cast restorations.
This laboratory study simulated actual clinical crown fabrication. Crowns were finished to the point of clinical delivery with stone and silver-plated dies made from representatives of the four major groups of elastomers. A clinically acceptable technique for judging crown margin accuracy was used, and numerical scores were assessed. Scores were analyzed statistically to compare die types, materials used, and types of discrepancies. Results of this study indicate the following information about the materials tested. The marginal accuracy of crowns fabricated on the silver-plated dies is statistically as accurate as that of crowns fabricated on stone dies in all cases and significantly more accurate in some instances. Silver-plated dies fabricated from Reprosil produced more accurate crowns than all other dies tested. Acceptable crown margins were obtainable from either stone or silver-plated dies when judged by clinical criteria. Silver-plated dies can be used without compromising crown margin accuracy.
Calcium Sulfate↗
Silver-plated dies. Part I: Platability of impression materials.
The purpose of this study were to determine the acceptability of silver-plated dies made from representative brands of impression material from each of the four groups of elastomers and to determine the time required for initial plating of dies. Permlastic and Impregum , each previously shown to produce consistent silver-plated dies, were used for comparison. Representatives from the condensation-reaction and addition-reaction ( polyvinylsiloxanes ) silicones groups were tested until satisfactory materials were selected. Citricon and Xantopren - Optosil were tested in the former group and President and Reprosil in the latter. Conclusions include the following: All materials were flash-plated in 10 minutes or less. Acceptable silver-plated dies were obtained from Permlastic and Impregum . Acceptable silver-plated dies were obtained from condensation-reaction silicones with Xantopren - Optosil . From the polyvinylsiloxane group, Reprosil plated more consistently than President. Both produce acceptable dies. The technique modification studied was not effective for Citricon and President. The surface quality of silver-plated dies and the consistency of plating varies with materials. Individual impression materials should be tested prior to their routine clinical use with silver-plating procedures.
Dental Casting Technique↗