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At least 721 records · Page 40Linked to original sources
PubMed1987

Replacement of lost or broken denture teeth with composites.

The replacement of lost or broken denture teeth can be accomplished with a quick, easy, and long-lasting result. The technique provides good esthetics and function, and the dentist can accomplish a replacement without a large inventory of stock teeth and without costly or time-consuming processing. The resultant repair withstands stress and wear comparable to that of acrylic resin denture teeth and is resistant to discoloration.

Composite Resins↗
PubMed1996

The influence of occlusal design on simulated masticatory forces transferred to implant-retained prostheses and supporting bone.

The influence of occlusal surface design on the longitudinal success of implant treatment is believed to be significant, but it is not well understood. It has been suggested that limiting lateral forces by reducing cuspal inclination is beneficial in the maintenance and preservation of osseointegration. This study used a method to apply quantified vertical forces to a food substance and record the forces and strain transmitted through cusped 33-degree and cuspless 0-degree occlusal design specimens to a simulated implant-retained prosthesis and the supporting bone. A series of five masticatory cycles were applied to each of the specimens with a universal testing machine. The data were analyzed to compare (1) forces required to cause initial breakage of the food, (2) maximum breakage forces applied before cycle termination, and (3) maximum strain registered by strain gauges at the bone level. Initial breakage forces for the cuspless specimen were 50% less than for the cusped specimen (p = 0.006). No significant differences were found between maximum breakage forces and maximum strain (p values 0.744 and 0.315, respectively). The results of this pilot study indicated that the occlusal configuration and cusp angulation of implant-retained prostheses play a significant role in force transmission and the stress-strain relationship in bone.

Animals↗
PubMed1997

A procedure for constructing dentures with interchangeable teeth.

Studies that compare different types of complete denture teeth have repeatedly emphasized the importance of standardizing all denture factors, except the type of teeth. Within-subject comparisons have also been recommended to avoid personal differences between patients. For optimum results, one denture should be constructed for each patient with interchangeable teeth. This article describes a simple and accurate procedure for constructing dentures with interchangeable posterior teeth.

Acrylic Resins↗
PubMed1997

A simplified procedure for stabilizing pontics.

A simplified technique is described for use when waxing pontics to a fixed partial denture which ensures accurate pontic placement without attaching the pontic to the retainers until late in the fabrication process. This technique allows easy access to the proximal contours and margins of the retainers and to proximal and gingival contours of the pontic while maintaining an accurate occlusal relationship.

Dental Occlusion↗
PubMed1997

A longitudinal clinical assessment of spark erosion technology in implant-retained overdenture prostheses: a preliminary report.

STATEMENT OF PROBLEM: As adapted for the dental profession, spark erosion technology permits precise machining of retentive metal overdenture frameworks for use in implant prosthetics. PURPOSE: The resultant prostheses are retentive and provide a number of benefits offered by both conventional overdenture and fixed prosthetic designs. MATERIAL AND METHODS: Preliminary data collected from an ongoing 5-year clinical trial were reviewed to qualitatively assess the clinical results obtained from 25 spark eroded implant-retained overdenture prostheses placed in 24 subjects. RESULTS: Throughout an evaluation period of 13.33 months (range 4 to 19 months), subject responses measured by questionnaire were uniformly good. Few complications were encountered and were limited to resin denture base/tooth fractures or retentive component failures that were easily repaired. CONCLUSION: Overdenture prostheses retained by spark eroded milled frameworks offer an acceptable treatment alternative for patients undergoing dental implant therapy.

Dental Alloys↗
PubMed1997

The swelling phenomenon of acrylic resin polymer teeth at the interface with denture base polymers.

PURPOSE: This study examined the interface between acrylic resin polymer teeth and denture base polymers. MATERIAL AND METHODS: An autopolymerized denture base polymer was cured either at 30 degrees C, 50 degrees C, or 70 degrees C, and a heat-cured denture base polymer was cured at 100 degrees C in contact with acrylic resin polymer teeth. The specimens were ground wet and polished to a thickness of 0.21 mm for the examination of the interface with a light microscope. The surface of the specimens was then treated with the solvent tetrahydrofuran, and the specimens were examined with a scanning electron microscope (SEM). RESULTS: As a result of grinding, the inner parts of the beads at the interface of the teeth were exposed to the denture base polymer. The inner part in these polymer beads of the polymer teeth swelled to a depth of 3 microns when the autopolymerized polymer was cured at 30 degrees C. When cured at 70 degrees C, the thickness of the swelled layer was 21 microns (p < 0.001). Microscopically, the interface between the heat-cured denture base polymer and the polymer teeth appeared diffuse in the region of the interpenetrating polymer networks (IPN) and the matrix. The IPN appeared as a separate zone in the outer parts of the beads of the teeth, both with the light microscope and with the SEM. CONCLUSIONS: The results suggest that by increasing the polymerization temperature, the monomers of the denture base polymers diffused more effectively into acrylic resin polymer teeth. This increases the bond strength between the polymer teeth and the denture base polymer.

Acrylic Resins↗
PubMed1997

Composite occlusal surfaces for acrylic resin denture teeth.

Acrylic resin denture teeth often exhibit rapid occlusal wear, which may lead to a loss of chewing efficiency and a loss of vertical dimension of occlusion. The use of metal occlusal surfaces on the acrylic resin denture teeth will minimize occlusal wear. Several articles have described methods to construct metal occlusal surfaces; however, these methods are time-consuming, costly, and sometimes considered to be unesthetic. These methods also require that the patient be without the prosthesis for the time necessary to perform the laboratory procedures. This article presents a quick, simple, and relatively inexpensive procedure for construction of composite occlusal surfaces on complete and partial dentures.

Acrylic Resins↗
PubMed1997

Comparison of the clinical abrasion resistance of six commercially available denture teeth.

PURPOSE: Clinical abrasion of denture teeth has certain implications when dentures are worn in excess of the average useful lifetime. The purpose of this study was to evaluate clinical denture tooth wear over a period of 3 years. MATERIAL AND METHODS: The wear of six commercially available denture teeth (Premierdent, Acrotone, vitapan, Rx1, Duravite, and Ivoclar Orthosit) and a seventh combination of teeth was compared. Seventy patients with complete dentures were divided into seven groups of 10 each to form the study population. RESULTS: There were no significant differences among the commercial denture teeth. Porcelain/Vitapan teeth exhibited the highest amount of abrasion. Significant wear was also measured between the Ivoclar Orthosit and Porcelain/Vitapan teeth.

Acrylic Resins↗
PubMed1998

A comparison of the effect of different occlusal forms in mandibular implant overdentures.

STATEMENT OF PROBLEM: Posterior tooth form selection for implant overdentures is made according to personal preference and experience using the concepts of conventional complete denture prosthodontics. PURPOSE: This study (1) compared the masticatory efficiency of three occlusal forms, 0 degrees, 30 degrees, and lingual contact (lingualized occlusion), in subjects with mandibular implant overdentures, and (2) determined their effects on the implant supporting tissues. MATERIAL AND METHODS: Eight patients who had four root form implants in the mandibular symphysis area connected with a Hader bar were selected. Maxillary and mandibular dentures were constructed for each patient with interchangeable posterior segments and the three occlusal forms were tested. The masticatory efficiency for each posterior tooth form was assessed with objective food tests and a subjective patient preference questionnaire. Periodic evaluation of implant-supporting tissues also was performed. RESULTS: Reliability analysis showed that all R1 coefficients were > or =0.80 (<0.001), indicating high subject consistency between multiple chewing efficiency trials. MANOVA analysis indicated a significant difference in chewing efficiency among the three occlusal forms (p < 0.001). The 0 degree occlusal form was associated with a significantly higher number of chewing strokes compared with 30 degrees or lingualized occlusal forms. The different occlusal forms were not found to have a clinically detrimental effect on the peri-implant soft or hard tissues. CONCLUSION: Chewing efficiency tests and patient preference ratings showed that 30 degree teeth and lingual contact provided better chewing efficiency than 0 degree teeth. None of the tested occlusal forms showed any clinical or radiographic detrimental effect on the implant-supporting tissues.

Aged↗
PubMed1999

Shear bond strengths for composite and autopolymerized acrylic resins bonded to acrylic resin denture teeth.

Statement of problem. Composite has been used to modify acrylic resin denture teeth. Purpose. This in vitro investigation examined the shear bond strengths between composite and autopolymerized acrylic resin bonded to acrylic resin denture teeth. Material and methods. The surface treatments used for the denture teeth included wetting with methyl methacrylate (MMA), vinylethyl methacrylate monomer (VEMA), unfilled liquid resin, composite bonding agent, and composite color modifier. Nonhydrated and hydrated denture tooth groups were included. A commercial composite was bonded to the denture teeth. The control group consisted of autopolymerized PMMA resin bonded to the acrylic resin denture teeth, and another group consisted of polyvinylethyl methacrylate bonded to acrylic resin denture teeth. The samples were thermocycled and tested in shear. Results. Acrylic resin denture teeth prewetted with MMA and treated with unfilled resin or a bonding agent had bond strength values comparable to the control group. VEMA was not as effective in promoting the bond. Composite color modifier did not produce a significantly weaker bond between the acrylic resin teeth and added composite. No prewetting of the teeth with MMA resulted in the lowest bond strength. Mean shear bond strengths for corresponding hydrated and non-hydrated groups were not significantly different. Conclusion. Bond strength of composite-to-acrylic resin denture teeth was comparable to the bond strength of autopolymerized acrylic resin.

Acrylic Resins↗
PubMed1999

Qualitative and quantitative determination of dental amalgam restoration volume.

STATEMENT OF PROBLEM: Volume of tooth structure replaced by an existing restoration, as assessed by visual and radiographic examination, is one diagnostic measure used by dental practitioners and dental insurance agencies to determine the relative need to restore a tooth with a full-coverage cast restoration. However, use of these methods has not been validated. PURPOSE: This study compared the volume of a range of dental amalgam restorations placed in typodont teeth, as estimated by dentists, dental students and laypersons, with the actual volume of each restoration. METHODS AND MATERIAL: Sixty subjects (20 dental school faculty, 20 dental students, and 20 clerical staff [laypersons]) participated. After reviewing photographic images of typodont teeth with mesial-occlusal-distal dental amalgam restorations, subjects estimated the volume of each restoration using various restorations on different teeth as a percentage of its tooth's coronal volume. The actual volume of each dental amalgam restoration and that of the coronal portion of the prepared teeth was calculated with a volumetric displacement technique. The single sample 2-sided t test with a.05 level of significance was used to evaluate the null hypothesis (H0 ): The survey participant's estimates of each restoration's percentage volume are the same as the measured volume values versus the alternative hypothesis (H1 ): estimates differed from the measured volume values. One-way analysis of variance was used to determine the significance of any difference between the estimates of the 3 survey test groups. RESULTS: Average volumes reported by all 3 groups were significantly different than the measured volume values (P <.05). Experience and dental training did not significantly affect a participant's ability to evaluate restoration volumes with greater accuracy. Results reported by dentists, dental students, and laypersons were not significantly different (P >.05). CONCLUSIONS: The volume of a restoration is inaccurately assessed by visual and radiographic examination.

Analysis of Variance↗
PubMed1999

Functionally generated paths for ceramometal restorations.

This article describes a procedure to generate functional path occlusion for ceramometal restorations. With this procedure, the metal framework is formed conventionally, full contour inlay wax is added to the metal framework, and the patient carves functional paths into the wax. These paths are registered with a stone matrix that the ceramist uses as a guide. Advantages over conventional techniques include increased accuracy and simplification of procedures.

Dental Articulators↗
PubMed1999

Fabricating a stable record base for completely edentulous patients treated with osseointegrated implants using healing abutments.

A stable record base is essential for accurate interocclusal centric relation records in a completely edentulous patient. In implant prosthodontics, several procedures have been suggested for the fabrication of a stable record base. However, these procedures necessitate removal of the healing abutments during the interocclusal record procedure and the trial denture placement, which makes the procedures tedious and time-consuming. When the implant-prosthesis interface is subgingival, the patient may also experience discomfort during these procedures. This article describes a procedure for fabricating a stable record base that uses the healing abutments, which eliminates the necessity of the healing abutment removal and its consequences. Advantages and disadvantages of this procedure are also discussed.

Acrylic Resins↗
PubMedDate not supplied

A missing denture.

Explore the source record for details and available documents.

Foreign Bodies↗
PubMed1997

A survey of the pre-bonding preparation of denture teeth and the efficiency of dewaxing methods.

OBJECTIVES: Denture tooth debonding remains a significant problem, with the surface condition of the tooth playing a pivotal role. The purpose of this investigation was to determine the methods used in tooth preparation. The efficiency of wax removal from teeth using a range of water temperatures was also investigated. METHODS: (a) A postal survey on the methods of denture tooth preparation, prior to denture processing, was conducted amongst dental instructors in prosthodontic departments of dental schools in Great Britain and Ireland. (b) Tooth surfaces contaminated with fluorescence wax were subjected to agitation in water at a range of temperatures and the surfaces examined under ultraviolet radiation. RESULTS: (a) The majority of operators did not use a solvent for the removal of the wax film from the teeth. Modification of the tooth ridge lap surface was carried out by 52% of the respondents on initial processing but increased to 85% when rebonding teeth. (b) Dewaxing denture teeth at a range of water temperatures showed wax retention on the tooth surfaces up to 90 degrees C. Rough surfaces retained more wax than smooth surfaces. Wax eliminator was shown to be necessary for complete wax removal. CONCLUSIONS: No standard technique exists amongst dental instructors for the preparation of denture teeth prior to acrylic resin polymerization. The use of a wax solvent is to be recommended.

Acrylic Resins↗