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At least 613 records · Page 34Linked to original sources
PubMed1989

Comparative bond strengths of light-cured, heat-cured, and autopolymerizing denture resins to denture teeth.

Standard and interpenetrating polymer network acrylic resin denture teeth were milled into cylinders 8 mm in diameter and processed against cylinders of the three different resins. The specimens were reduced by milling to a diameter of 6 mm in the region of the tooth-resin interface and thermocycled for 24 hours. Specimens were then subjected to tensile loading until fracture. Group means were compared by using the Duncan multiple range test at the 5% level of significance. The strongest bond occurred between the heat-cured resin and the standard acrylic resin teeth. Intermediate strength was achieved with the heat-cured resin to the IPN teeth and the autopolymerizing resin to both types of teeth. Lowest strength was measured with the light-cured resin to both types of teeth.

Acrylic Resins↗
PubMed1989

Treatment for acute craniomandibular dysfunction symptoms in edentulous patients with unserviceable or no existing complete dentures.

This article describes techniques to make unserviceable complete dentures rapidly serviceable and to facilitate using them in the diagnosis and treatment of acute craniomandibular dysfunction symptoms in edentulous patients. A technique is described to make complete dentures rapidly in the event that the complete dentures cannot be made serviceable or the patient has no complete dentures. This technique uses the TRIAD visible light-cure system. Once the complete dentures are made, they can be used alone or in conjunction with an occlusal splint for the diagnosis and treatment of acute craniomandibular dysfunction symptoms.

Dental Occlusion↗
PubMed1989

Fixed partial dentures opposing complete dentures.

When fixed partial dentures are indicated in an arch opposing a complete denture, it is best to develop the occlusal surfaces of the fixed restorations at the same time that the opposing denture teeth are arranged in wax to permit greater flexibility and reduce the compromise in developing bilateral balanced occlusion. This article describes the development of bilaterally balanced occlusion between casting patterns for fixed partial dentures and a complete denture. The technique emulates the ease of arranging maxillary and mandibular denture teeth and can be used to develop fixed restorations with metal or porcelain occlusal surfaces. Porcelain occlusal surfaces are described because the use of porcelain is more technique sensitive.

Acrylic Resins↗
PubMed1989

Visible light-cured denture base resin used in making dentures with conventional teeth.

A visible light-cured denture base can be made to serve as a custom record base and as the final denture base. After individual conventional denture teeth are set in wax, a matrix can be made to hold the teeth in relation to the denture base and cast after the wax is removed and during the time the light-cured resin is being added and partially cured. When the matrix is removed, additional light-cured resin can be added to establish the denture contours and the denture can be processed without flasking.

Acrylic Resins↗
PubMed1989

Augmenting retention of a removable partial denture repair.

A simple technique improves the retention of a tooth to be added to an existing removable partial denture. The procedure includes placing a small contoured wire into the space provided for the acrylic resin repairing material.

Acrylic Resins↗
PubMed1990

Three-dimensional color coordinates of natural teeth compared with three shade guides.

The three-dimensional color coordinates of 2832 human teeth were measured in vivo and were plotted in a cylindrical Hue, Value/Chroma space, using a program in BASIC. The commonly used Vita, and Bioform shade guides, and a surviving shade guide of E. B. Clark were compared with these natural teeth. The shade guides did not match well with the color space of the human teeth, and the anticipated deficiencies were in the yellow-red Hues, higher Values, and higher Chromas. However, the points for natural teeth were in a narrow flounder-like configuration, suggesting that a representative shade guide matching natural teeth could be generated with limited samples.

Color↗
PubMed1990

Effect of retention grooves on tooth-denture base bond.

The bond strength of acrylic resin teeth with and without retention grooves processed onto standard and high-impact denture base resin was investigated. A shear compressive force was applied at an angle of 130 degrees to the lingual surface of the teeth until fracture occurred. The values were subjected to a two-way analysis of variance with repeated measures. Canine teeth bonded better than central or lateral incisors (p less than 0.01). A significantly greater force was required to fracture teeth from high-impact resin (p less than 0.01). Vertical retention grooves enhanced bond strength (p less than 0.01).

Acrylic Resins↗
PubMed1990

Provisional restoration for a patient with cleft lip and palate: a clinical report.

A method for designing and fitting a provisional restoration for a patient with a cleft lip and palate was described. The provisional prosthesis provides an alternative treatment option that allows the dentist to plan the definitive restoration while providing the patient with a temporary but esthetic and functional restoration.

Adolescent↗
PubMed1990

Cast connectors as cores for ceramometal pontics on removable partial dentures and for splinting anterior crowns.

A cast connector is a solderless union between two metal components, an alternative to soldering. Cast connectors depend upon mechanical retention for their strength and integrity and are mostly used in repairing or adding to prostheses cast in base metal alloys. Two techniques using cast connectors are described. One is for a removable partial denture that requires the replacement of an anterior tooth or teeth incorporating diastemas or unusual surface anatomy and color variations. Stock denture teeth may not adequately replicate such teeth. A solution to the problem is to extend a porcelain-compatible base metal cast connector from the removable partial denture framework onto the pontic site. A ceramometal pontic reproducing the unusual characteristics of the natural teeth may then be placed by vacuum-firing porcelain directly onto the framework. A second technique is described whereby multiple ceramometal anterior crowns may be splinted together by creating interproximal retentive zones in the frameworks, casting connectors into the retentive zones, and proceeding with porcelain application.

Acrylic Resins↗
PubMed1991

Bond strength and failure analysis of light-cured denture resins bonded to denture teeth.

This study examined the tensile bond strength and failure sites of one heat-cured (Microlon) and two visible light-cured (Triad and Extoral) denture resins to two types of denture teeth. The resins were processed into cylinders against denture teeth milled to the same size. Half of the specimens were thermocycled. After tensile testing, statistical analysis (p 0.05) showed that the strongest bond was achieved with the heat-cured resin Microlon, whereas Triad resin displayed the stronger bond between the two light-cured resins. Scanning electron microscopic analysis showed that the nature and location of the fracture sites was different among the three resins tested.

Acrylic Resins↗
PubMed1991

Porcelain-metal pontics for removable partial dentures.

A custom-made porcelain-fused-to-metal ring pontic for a removable partial denture may be color characterized and glazed by use of familiar procedures. The use of this type of pontic on removable partial dentures has the potential of superior esthetic results when replacing isolated maxillary anterior teeth.

Dental Alloys↗
PubMed1991

Dimensional change in maxillary prosthetic obturators.

Dimensional stability of obturator bases and changes in occlusal relationships are areas of clinical importance in the oral rehabilitation of maxillectomy patients. The dimensional change in maxillary prosthetic obturators constructed with three different denture base resins was investigated. The results indicate that a light-polymerized material had the least percent of change between base and teeth positions.

Acrylic Resins↗
PubMed1991

Bonding of plastic teeth to denture base resins.

This study evaluated the bond strengths of some new and traditional resin denture teeth and denture base resins. It included regular monolithic acrylic resin teeth (Bioform), monolithic acrylic resin-IPN teeth (Bioform IPN), and multilithic acrylic resin-composite resin teeth (Vivosit), with relatively new light-activated resin (Triad), conventional heat-cured resin (Lucitone 199), and autopolymerizing resin (Hygenic) denture base materials. The results of four-point flexure testing showed that the traditional materials gave the highest bond strength values. The autopolymerizing resin systems demonstrated interfacial failure with all resin denture teeth, showing that the common practice of treating teeth with the respective autopolymerizing monomer failed to produce adequate bond strength. Combinations of acrylic resin, IPN, and multilithic denture teeth with light-activated resins gave results calling for improvements in basic bonding system design, since interface debonding was prevalent. No failures occurred between the lap-ridge region of the multilithic tooth system and conventional heat-cured denture base resin.

Acrylic Resins↗