Thermal cycling procedures for laboratory testing of dental restorations.

Current ceramic materials offer preferred optical properties for highly esthetic restorations. The inherent brittleness of some ceramic materials, specific treatment modalities, and certain clinical situations require resin bonding of the completed ceramic restoration to the supporting tooth structures for long-term clinical success. This article presents a literature review on the resin bond to dental ceramics. A PubMed database search was conducted for in vitro studies pertaining to the resin bond to ceramic materials. The search was limited to peer-reviewed articles published in English between 1966 and 2001. Although the resin bond to silica-based ceramics is well researched and documented, few in vitro studies on the resin bond to high-strength ceramic materials were identified. Available data suggest that resin bonding to these materials is less predictable and requires substantially different bonding methods than to silica-based ceramics. Further in vitro studies, as well as controlled clinical trials, are needed.

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Resin-ceramic bonding: a review of the literature.

Statement of problem Developments in ceramic core materials such as lithium disilicate, aluminum oxide, and zirconium oxide have allowed more widespread application of all-ceramic restorations over the past 10 years. With a plethora of ceramic materials and systems currently available for use, an overview of the scientific literature on the efficacy of this treatment therapy is indicated. Purpose This article reviews the current literature covering all-ceramic materials and systems, with respect to survival, material properties, marginal and internal fit, cementation and bonding, and color and esthetics, and provides clinical recommendations for their use. Material and methods A comprehensive review of the literature was completed seeking evidence for the treatment of teeth with all-ceramic restorations. A search of English language peer-reviewed literature was undertaken using MEDLINE and PubMed with a focus on evidence-based research articles published between 1996 and 2006. A hand search of relevant dental journals was also completed. Randomized controlled trials, nonrandomized controlled studies, longitudinal experimental clinical studies, longitudinal prospective studies, and longitudinal retrospective studies were reviewed. The last search was conducted on June 12, 2007. Data supporting the clinical application of all-ceramic materials and systems was sought. Results The literature demonstrates that multiple all-ceramic materials and systems are currently available for clinical use, and there is not a single universal material or system for all clinical situations. The successful application is dependent upon the clinician to match the materials, manufacturing techniques, and cementation or bonding procedures, with the individual clinical situation. Conclusions Within the scope of this systematic review, there is no evidence to support the universal application of a single ceramic material and system for all clinical situations. Additional longitudinal clinical studies are required to advance the development of ceramic materials and systems.

Current ceramic materials and systems with clinical recommendations: A systematic review

New developments of polymeric dental composites

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. (J Prosthet Dent 1998;80:280-301.)

Dental luting agents: A review of the current literature

1) Nihon University Graduate School of Dentistry, Tokyo, Japan 2) Department of Fixed Prosthodontics and Division of Advanced Dental Treatment, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan 3) Department of Fixed Prosthodontics, Nihon University School of Dentistry,Tokyo, Japan 4) Department of Oral Health Sciences and Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan 5) Department of Biochemistry and Division of Functional Morphology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan (Accepted for publication, January 5, 2012)

Influence of Compressive Force and IL-1β on Metabolism of the Extracellular Matrix in Human Chondrocytes

This study evaluated the effect of preliminary irradiation on the depth of cure and Knoop hardness of a veneering composite. The composite was filled into a mold, and irradiated with different irradiation duration or irradiance. After removing the mold, the depth of cure was measured, and the Knoop hardness number at each depth was determined and statistically analyzed using Mann-Whitney U test. Depth of cure of the composite polymerized by the Sublite S unit with a distance of 15 cm for 30 or 60 s was less than 2.0 mm. The Knoop hardness number of the group polymerized by the Hyper LII unit without preliminary irradiation and the group polymerized by the Sublite S unit with a distance of 3 cm was higher than that of the group polymerized by the Sublite S unit for 90 s or the group polymerized by the Solidilite unit, respectively, even though the depth of cure for these four groups was higher than 2 mm. Preliminary irradiation with long duration and low irradiance caused a low degree of polymerization, which is probably effective in enhancing the bond strength between veneering composite and cast framework. (J Oral Sci 52, 71-75, 2010)

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Effect of preliminary irradiation on depth of cure and hardness of a veneering composite.

Cast titanium restoration for molars has high biocompatibility and is covered by the Japanese national health insurance. Titanium casting requires specific investment material and casting apparatus. A cast restoration for the mandibular left second molar was fabricated using titanium in this study. A wax pattern fabricated on a definitive cast was invested in calcium aluminate-bonded magnesia investment material. Titanium was cast using an argon gas pressure one-chamber casting apparatus. No defects were observed on the surface and the hole was clearly reproduced. A smooth surface on the restoration was obtained by polishing at low speed. Reproductivity and polishing properties of the titanium restoration fabricated in this study were comparable to those of conventional dental metal restorations.

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Fabrication of titanium restoration by means of calcium aluminate-bonded magnesia investment material and one-chamber arc casting apparatus.

Inner Surface Treatment for Resin Jacket Crown

Purpose: The purpose of this article was to review the researches on prosthodontic materials and devices published by members of the Japan Prosthodontic Society.Study selection: A total of 12 original articles published in the Journal of Japan Prosthodontic Society were selected. All were related to prosthodontic materials and devices, and published in Volume 49 of the journal in 2005.Results: The research projects covered the fields of diagnostic systems, fixed prosthodontics, tooth-colored materials, titanium alloys, inorganic materials, and sports dentistry.Conclusion: Overall, the reports suggest that considerable improvement in the outcome of prosthodontic treatment can be achieved if new generation materials and devices were properly selected and applied.

Hideo Matsumura

Papers

Influence of Compressive Force and IL-1β on Metabolism of the Extracellular Matrix in Human Chondrocytes

Effect of preliminary irradiation on depth of cure and hardness of a veneering composite.

Fabrication of titanium restoration by means of calcium aluminate-bonded magnesia investment material and one-chamber arc casting apparatus.

Inner Surface Treatment for Resin Jacket Crown

Research Projects on Materials and Devices Published in 2005 by Members of the Japan Prosthodontic Society : A Review