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At least 649 records · Page 36Linked to original sources
PubMed1993

Effect of tinfoil substitute contamination on adhesion of resin denture tooth to its denture base.

At least one manufacturer claims that contamination of denture teeth with tinfoil substitute during processing is not detrimental. The purpose of this study was to determine whether tinfoil substitute contamination has any significant effect on the bond strength between acrylic resin denture teeth and their processed acrylic resin base. Eighty acrylic resin maxillary central incisors were processed to denture base material. The experimental group had the denture tooth ridgelap area contaminated with tinfoil substitute. The control group was not contaminated. The bond strength of the two groups was tested. The results indicate that contamination with tinfoil substitute significantly reduces the bond strength of acrylic resin denture teeth bonded to their denture base.

Acrylic Resins↗
PubMed1993

Five techniques for single tooth replacement on endosseous root-form implants.

Internally hexed and threaded root-form implants provide the clinician with many new treatment options for single tooth restorations. Coupled with an interlocking hex on the abutment, they provide stability for single tooth restorations while maintaining the options of screw or cement retention. Five techniques for fabricating single tooth restorations are presented. Clinical and laboratory evaluations of implant angulation, quantity and quality of the gingival tissues, and limitations in vertical height are discussed in relation to design, abutment selection, and laboratory procedures for each restoration. These techniques permit design of each restoration to meet the unique anatomic, functional and esthetic needs. Both screw-retained and cement-retained abutments and prostheses are discussed.

Dental Abutments↗
PubMed1994

Composite denture teeth made on a removable partial metal framework.

Most denture teeth and denture bases are made of polymethyl methacrylate, which does not chemically bond with a metal framework. The absence of a chemical bond leads to weak retention and high microleakage between the resin and metal interface. With a 4-META bonding agent, a chemical bond that increases retention and decreases microleakage can be created between the composite and the metal interface. This article describes a method for making composite denture teeth with a 4-META bonding agent. It can be done without costly equipment and can also be used to repair acrylic resin denture teeth.

Composite Resins↗
PubMed1994

Simplified procedure for making gold occlusal surfaces on denture teeth.

The procedure described is used to reproduce, in gold, the occlusal morphology of complete and removable partial denture teeth or those of an implant-supported prosthesis. The gold occlusal surfaces are made after all adjustments are completed and the occlusion is harmonious. An acrylic resin strut reinforces the wax patterns, and a reline jig is used to accurately stamp out the occlusal anatomy in wax. Careful adherence to the step-by-step procedure is required to achieve an excellent result.

Dental Casting Technique↗
PubMed1994

Changes caused by processing complete mandibular dentures.

Qualitative and quantitative comparisons were made before and after complete mandibular dentures were processed. Linear measurements indicated shrinkage in all dimensions, and the greatest shrinkage occurred in an anteroposterior direction along the lingual flanges. Differences in shrinkage across the various points measured suggest that the denture material twists during curing, and the final qualitative changes appear as pressure areas in the distolingual and anterolabial regions.

Acrylic Resins↗
PubMed1994

Assessing shade differences in acrylic resin denture and natural teeth.

Four experiments in this study assess shade differences in acrylic resin denture and natural teeth. The first two examine the perceptual errors made by experienced dentists in their use of a manufacturer-provided shade guide for acrylic resin denture teeth. In the first of four experiments, dentists examine whether the numbering of a selected shade guide corresponds to the arrangement of the tabs from light to dark. In the second experiment, a visual discrimination task determines whether dentists can distinguish shade guide tabs from one another. The results from these two experiments revealed that the numbered progression of the shade tabs does not correspond to a light-to-dark order, that dentists have difficulty discriminating between several shade tabs, and that the shade tabs can be rearranged on an empirical basis. The third experiment demonstrated how the shade of natural teeth varies by age, gender, and complexion. The Biotone shade guide, rearranged in the manner suggested by the second experiment, was used to make these assessments. The fourth experiment examined whether the shades used for complete dentures were similar to shades found in natural teeth. The results from the last two experiments showed that shade selection can be facilitated by use of a rearranged set of shade guide tabs. The results also reveal that natural teeth significantly and clinically darken with age; however, selections made for denture teeth tend to be relatively constant in color, despite the age of the patient. Differences for gender and complexion do not appear to be clinically significant.

Acrylic Resins↗
PubMed1994

Observations on long-term use of a soft-lining material for mandibular complete dentures.

There has been ample evidence for short-term clinical success of Molloplast-b soft-lining materials, but their use has been discouraged because of an assumed need for frequent replacement. This article presents observations on 22 patients who were provided with Molloplast-b soft-lining materials in their mandibular complete dentures for up to 9 years. Fifteen of the patients were still wearing soft-lined dentures; four had been provided with implant-supported overdentures and two had converted to hard-based dentures. In nine patients occlusal wear was a reason cited for the need to replace the complete dentures, indicating that the soft-lining material had outlasted the acrylic resin teeth.

Adult↗
PubMed1994

Duplicating an existing complete denture to make a replica.

Sometimes it is desirable to make a few changes when making new complete dentures for a patient who has been wearing old dentures for a long time and is satisfied with them. Replica dentures can be made for these patients, and success with the new dentures can be assured. A procedure is presented for duplication of the old dentures to make replicas.

Calcium Sulfate↗
PubMed1976

The implantation of natural tooth form bioglasses in baboons. A preliminary report.

This report describes a 6-month screening study comparing the tissue responses of several bioglass natural tooth implants in adult female baboons. The dental implants were designed to elicit osteogenesis at the interface of the implant and the oral tissues. This is in contrast to those types of implant materials that are merely biologically acceptable. Incisor teeth were extracted, dupplicated in bioglass, returned to the natural sockets, and splinted to the adjacent natural tooth, where they remained splinted for 3 months and then free standing for an additional 3 months. Microscopic evaluation revealed distinct histopathologic characteristics with certain bioglass formulas, such as ankylosis, a pseudofibrous capsule with fibers running parallel to the root surface, or an apparently true periodontal membrane with properly oriented Sharpey's fibers. True cementogenesis was not found.

Animals↗
PubMed1989

One-dimensional color order system for dental shade guides.

The purpose of this study was to re-arrange the master Bioform shade guide into a long-range one-dimensional color system based upon color difference. Although most shade guides may show local order when arranged according to hue, long-range order has not been established. However, shade guide arrangement according to a logical color order would be an advantage to the user. The first step in determining the color order was to measure the color of the shade guide teeth. A methodology was developed for measuring the color by use of a reflectance spectrophotometer. The precision of measurement was determined to be equal to CIE L*a*b* delta E of 0.5. Spectra were obtained and converted into CIE L*a*b* and Munsell notation. The measured colors of the Bioform shades ranged from a Munsell hue of 0.9 Y to 3.5 Y; a value of 6.6 to 7.8; and a chroma of 1.9 to 4.1. The teeth were then arranged visually from light to dark. The correlation coefficient between the visual ranking and color difference was 0.95. There was an inverse correlation between visual ranking and Munsell value, with a correlation coefficient of 0.90. Therefore, the sequence according to color difference provided the better agreement with visual perception.

Color↗