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Results for “Prosthesis Coloring”

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At least 433 records · Page 24Linked to original sources
PubMed1994

Clinical performance of three anterior restorative materials over 10 years.

The long-term performance of two chemically activated composite resins was compared to that of one silicate cement. Bulk and cavosurface marginal discoloration was evaluated with both an indirect photographic method and the direct US Public Health Service evaluation system. The results confirmed that composite resins had superior performance but higher secondary caries incidence than did silicate cements. The macrofilled composite resins showed better clinical performance than the microfilled restorations, as well as similar incidences of bulk and marginal discoloration. The agreement between the scores obtained with the direct evaluation criteria and those resulting from the indirect evaluation method was relatively poor. The indirect scores were usually the same or poorer than the direct clinical scores. The results indicated that the clinical evaluation may be the least sensitive of the two methods. The discrepancy in the scorings may, on the other hand, signify that the indirect photographic method records reflectance spectra that are not normally obtained in vivo.

Adolescent↗
PubMed1993

Dentures and partials or esthetic removable prosthetics.

In the past 50 years, advances in restorative dental procedures have made it possible for dentists to achieve better esthetic and functional results for their patients than ever before. Removable prosthodontics has been practiced in much the same way that is has been for many years. Since the introduction of root-form osseointegrated implants, there is a renewed interest in the edentulous and partially edentulous patient. To give the patient all possible treatment options, implants must be considered, but they must not replace sound prosthodontic principles. Presurgical prosthodontics in the form of provisional restorations and stents are necessary for correct implant placement. Overdentures, bar partial dentures, and soft liners are sound treatment alternatives. Review of the work of Dr. Earl Pound is the best source for the development of correct complete dentures.

Cross Infection↗
PubMed1993

Porcelain laminate veneers: a clinical success?

The rapid increase in the use of porcelain veneers is a result of the demand for a minimally invasive, colour and contour stable restoration. However, such restorations are not equally successful in all patients. This article describes the careful treatment planning and patient selection necessary to avoid problems and to ensure that the best result is achieved with porcelain veneers.

Dental Cavity Preparation↗
PubMed1994

Properties of acrylic resins incorporating 4META for bonding to cobalt-chromium alloys.

Polymer substitution into proprietary 4-methacryloxyethyltrimellitate anhydride (4META) resins creates tooth coloured veneers for cobalt-chromium overlay dentures. The elastic moduli and shear-bond strengths of proprietary resins (matched) and resins polymerised from 4META monomers and substituted polymers (unmatched) were determined. Bond strengths were similar for matched and unmatched heat curing resins (mean 14.1 (SD 1.6 MPa)) but differed for matched (6.9 (SD 1.3) MPa) and unmatched self-curing resins (5.7 (SD 0.9) MPa). Preparation of the alloy surface immediately before packing with resin dough provided significantly higher bond strengths. Structural examination in a scanning electron microscope suggested that bonds developed by unmatched resins may provide less satisfactory clinical performance.

Acrylic Resins↗
PubMed1995

IPS Empress. Restoration of a single anterior crown.

All-ceramic restorations have gained patient acceptance and are increasingly being used in aesthetic appearance-related restorations. This case report of a single anterior crown matching natural dentition utilizes some of the new special-effect ceramic powders designed for use with the layering technique. These powders help to properly replicate incisal, mamelon, and gingival areas. The clinical procedure is described, using photographs of the case to illustrate the steps involved.

Adult↗
PubMed1995

Protocol for predictable restoration of anterior teeth with composite resins.

The composite resins have reached a high degree of excellence and are now utilized with predictable results in restoring the anterior dentition. This article discusses the development of these resins and the histologic and optical considerations (polychromatic characteristics, hue, translucency and opacity, chroma, value, strength, and polishability). In restorative materials, the use of universal or all-purpose restorative resins is considered, ie, materials that combine the functional strength necessary for the posterior regions and the high gloss polishability necessary to emulate enamel in the anterior. The restorative sequence of cervical, middle, and incisal thirds describes the materials best suited for each third, along with aids to create the intricate refinement of hue, chroma, and value. The learning objective of this article is to review the principles involved in these restorations and to provide a protocol for their clinical implementation.

Clinical Protocols↗
PubMedDate not supplied

Predictable aesthetic reconstruction of fractured anterior teeth with composite resins: a case report.

Full-coverage rehabilitation is generally the treatment modality indicated for restoration of severely fractured anterior teeth. However, the advanced formulations of composite resins present improved physical properties, an expanded range of shade selection, and high sculptability, allowing predictable restoration of the anterior dentition and replication of the polychromatic characteristics of natural teeth. The learning objective of this article is to present the utilization of composite resin materials in the treatment of fractured maxillary anterior incisors, implementing the concepts of polychromatic characteristics, hue, translucency, opacity, chroma, value, strength, and polishability. Also presented are several practical clinical observations that will assist the practitioner in attaining predictable aesthetic results with composite resin material.

Adult↗
PubMed1996

Colorimetric analysis as a means of quality control for dental ceramic materials.

In this in-vitro study colorimetric analysis using the CIELAB-system was applied to two all-ceramic materials in shades A1 and A2. The material for the 96 specimens was taken from three production batches and examined spectrophotometrically after firing. For both materials the firing-process led to only small colour differences (average DE-value < 2.2). Between the three batches of each material, significantly higher, visually perceivable colour differences were detected. The results revealed that the Castor system is capable of producing high-precision colour measurements. The use of spectrophotometric devices is recommended as a means of quality control in order to decrease colour tolerances between different batches of the same material.

Aluminum Oxide↗
PubMed1996

Tinted luting resin for partial-coverage restorations: a case report of a new provisionalization technique.

A number of practical problems may be encountered when a dentist attempts to provisionalize an indirect restoration. Problems that relate to provisional restorations for conservative, less retentive, ceramic cavity forms are discussed. A provisionalization technique that improves marginal integrity, assures predictable retention, and facilitates cleanup following detachment is introduced.

Acrylic Resins↗