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At least 1,135 records · Page 63Linked to original sources
PubMed1997

Fiber-reinforced framework and Ceromer restorations: a technical review.

The utilization of synthetic resins and ceramics in combination with metal frameworks continues to be the mainstay of crown and bridge prosthetics. Although most of these systems have resulted in years of clinical success, each material when used in combination has inherent properties that induce stresses to the system. The combination of ceramic technology and polymer research, in addition to fiber integration, has resulted in the development and introduction of a new category of crown and bridge materials--a ceromer and fiber-reinforced restorative system. This article examines the history of polymer and ceramic technology, and reports the clinical and research data currently available on one indirect ceromer system (Targis System, Ivoclar Williams, Amherst, NY).

Ceramics↗
PubMed1997

Achieving functional restorations utilizing a new Ceromer system.

The advent of pressed ceramic restorations (IPS Empress, Ivoclar Williams, Amherst, NY) has driven dental therapy to continuously strive for more aesthetic and functional materials. The dental profession requires restorations to exhibit strength, natural color, wear resistance, marginal integrity, and ease of fabrication in the restorative therapies selected. With the introduction of a new ceromer and fiber-reinforced composite (FRC) system (Targis System, Ivoclar Williams, Amherst, NY), the replacement of a single tooth or multiple teeth with a FRC, metal-free bridge is now a suitable alternative to conventional dental therapy. This presentation will review the clinical protocol, material properties, and aesthetic characteristics of this new generation of restorative material.

Adult↗
PubMed1997

Using copy milling technology in restorative dentistry.

A technique for the fabrication of copy milled ceramic restorations has been presented. Both direct and indirect fabrication techniques of inlays, onlays, veneers, and crowns are possible. A copy milling machine can mill accurately fitting restorations with a marginal gap of 50 microns. The machine uses premanufactured porcelain blanks, which have improved physical properties over conventional porcelains used in standard techniques. Recently, the ability to mill In-Ceram crowns from presintered alumina blocks and Spinell crowns from alumina/magnesia blocks has been added to the system. The copings are veneered with aluminous porcelain as in the conventional In-Ceram technique.

Aluminum Oxide↗
PubMed1997

Full mouth reconstruction. Utilizing fiber-reinforced framework and Ceromer restorations in combination with pressed ceramic technology.

The final results of this case were pleasing to the patient and the dentist (Fig. 5). The missing teeth had been replaced, function had been restored, the anterior crowding had been eliminated (Fig. 6), and the bioesthetic symmetry and harmony had been restored (Fig. 7). The patient reported a dramatic increase in self confidence with her peers. (Fig. 8) Special thanks to Michael Milner for the excellent Laboratory work provided for this case.

Aluminum Silicates↗
PubMed1993

Evaluation of the porcelain laminate veneers as a new esthetic and reconstructive modality.

Veneers are being used for the esthetic improvement of anterior teeth, and porcelain veneers are a recent development in this field. This article will described briefly the porcelain laminate technique and attempts to evaluate it as a new esthetic and treatment modality. Though there are some shortcomings yet the advantages afforded by this system are considerable enough to make the technique deserving of further investigation.

Contraindications↗
PubMed1994

Microleakage of computer-generated Vita Cerec and Vitadur-N laminate veneers.

Laminate veneers are now used as conservative aesthetic alternatives to full coverage restorations in some cases, especially in young adults and children. With the development of improved restorative resin systems and the acid etch technique, thin preformed plastic laminate veneers were bonded to the labial surfaces of discolored, developmentally deformed or fractured teeth. However, aesthetic failure due to color instability, staining and wear happened. Now, with bonded porcelain veneers it is possible to achieve both an aesthetic result and a veneer preparation while restoring the function of anterior teeth. They are also used to restore fractured incisors. Ceramic veneers hold advantages over composite resin veneers in color stability, were resistance and lifelike aesthetics.

Adult↗
PubMed1998

Direct composites in a contemporary restorative practice.

Composite resins can restore teeth to natural appearance and function while conserving tooth structure. Adhesive technology has revolutionized tooth preparation, allowing minimum tooth removal without large retentive undercuts. Today's dental adhesives have strong bond strengths, bonding to both dentin and enamel. Many are available with fewer components, simplifying application. Composites are available in a large variety of shades in both microhybrids and microfills. Microhybrids are used in areas that need strength, whereas microfills are used in regions that require high surface gloss or decreased stiffness. Composites should be placed to natural form and shades before curing; finishing primarily involves polishing using silicone abrasives. Composites can be used to restore incisal edges, close diastemas, veneer facial surfaces, and repair defects, making teeth appear natural.

Compliance↗
PubMed1998

How competent do our graduates feel?

As part of a review of the undergraduate curriculum to assess its relevance for a future general practitioner, a survey of self-perceived competency at graduation based on the competency list developed by the Association of Canadian Faculties of Dentistry was circulated to recent graduates and the graduating class. The overall response was 67.5 percent, and revealed that approximately 70 percent of the respondents felt well prepared in approximately 69 percent of the competencies. These were the common "bread and butter" items of dentistry, such as basic restorative dentistry, examination, diagnosis, treatment planning, local anaesthesia, and scaling. Those areas reported as less well-prepared for included financial and personnel management, performance of soft-tissue biopsies, and management of chronic orofacial pain. Clarification of the raw survey results in focus groups was needed to uncover specific details that could lead to remedial action in problem areas.

Analysis of Variance↗
PubMedDate not supplied

Primary incisor restoration using resin-veneered stainless steel crowns.

The restoration of primary incisors with extensive caries lesions is a clinical challenge of severe dimensions. Not only are these teeth difficult to restore, but the patient's behavior can affect the treatment negatively. Requirements for an acceptable restoration include natural color; durability; adhesive cementation that is biocompatible with the pulp; easily and rapidly placed; requires only one treatment visit. Compared to other options, stainless steel crowns are the easiest to place. The most attractive restoration for these cases today is the adhesively bonded resin-composite crown, made by using acetate crown-form matrices, but this is being surpassed by the stainless steel crown forms (3M Unitek) that can be preveneered. This article describes a step-by-step method of placing preveneered stainless steel crowns for primary incisors.

Child, Preschool↗
PubMedDate not supplied

Shrinkage stresses associated with incremental composite filling techniques.

It is commonly accepted that stresses associated with polymerization shrinkage of composite restoratives can be reduced by utilization of an incremental filling procedure. A recent report using finite element analysis on a simple box preparation has shown that such a procedure actually produces higher stresses. The purpose of this investigation was to visualize the stresses generated by composite resin placed into photoelastic models of two surface preparations using different incremental techniques. Primary molar preparations were cast life-sized in a photoelastic material. Cavity walls were cleansed, primed and coated with unfilled resin. Incremental filling techniques of a hybrid composite resin were gingivo-occlusal, oblique, and facio-lingual. Comparisons were made with the bulk placement technique. The stresses developed within the model teeth were observed in the field of a circular polariscope under magnification. Generally few differences in shrinkage-induced stresses, were observed between the incremental filling techniques tested. The lowest shrinkage stresses were generated by the bulk placement technique.

Birefringence↗
PubMed1998

Class III cavity preparation in primary anterior teeth: in vitro retention comparison of conventional and modified forms.

Management of mild to moderate caries in primary anterior teeth is still a problem. Presently, class III composite restorations in primary teeth have inadequate retention. The purpose of this in vitro study was to analyze the influence of the design of modified class III cavity preparation on the retention of the restoration when compared to that of the conventional class III preparation. Thirty extracted human primary maxillary central incisors were divided into two groups of 15 teeth each. In one group, the conventional (triangular) class III design was prepared. The second group, the modified class III design, was prepared by adding to the conventional form, 0.5 mm. labial reduction on the labial tooth surface. The dentinal bonding agent, Amalgambond, was applied to 30 teeth according to instructions of manufacturer. The composite resin, Herculite XRV, was inserted into each preparation. All samples were mounted in plastic molds and thermocycled. The samples were tested with Instron testing machine until restoration failure. Results showed that the mean failure load of modified class III restoration group (92.19 +/- 13.6 N) was significantly higher from that of conventional class III preparation group (45.61 +/- 9.8 N) as tested by Student's independent t-test (P < 0.001).

Child↗