"Pressable ceramics" sure-fire techniques.
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Dental Porcelain↗
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Results for “TOOTH, ARTIFICIAL”
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[Removable complete dentures: esthetics, psychology and old photographs].
The prosthetic treatment of the edentate patient will be more and more difficult for different reasons here presented. The analysis of old photographs of the face and the smile with natural teeth can contribute to the psychological and esthetical success of the prosthetic treatment.
Aged↗
Construction of custom denture teeth.
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Acrylic Resins↗
Five-year results with fixed complete-arch mandibular prostheses supported by 4 implants.
This study examined whether it is possible to restore an edentulous mandible with a complete-arch fixed prosthesis retained by only 4 implants without decreasing the survival rate. One hundred nineteen patients received complete-arch mandibular prostheses retained by 4 implants. Most patients were followed for 3 years or more. All patients followed a routine protocol, including annual check-ups and regular radiographic examinations. Twenty-one patients dropped out. Radiographic measurements used the threads of the implants as a basis for comparison. No indication was found that the number of supporting implants could have influenced the observed frequency of technical and surgical complications. Three implants were lost, 2 after 1 year and 1 after 5 years. A statistically significant difference in bone loss between the mesial and distal implants was found. The number of fractured resin teeth in mandibular prostheses was higher when patients had an implant-supported prosthesis in the maxilla. The present study revealed an implant survival rate of 98.6% after 5 years. Therefore, it was concluded that there may not be a need for more than 4 implants to support a fixed mandibular prosthesis, when implants at least 10 mm long can be used.
Acrylic Resins↗
Pontics in fixed prostheses--status report. Council on Dental Materials and Devices.
It is clear that the choice and fabrication of a pontic demands as much care as any aspect of restorative planning and execution. To apply a particular pontic design arbitrarily is to disregard the work to date which appears to emphasize the individuality of each pontic situation. Existing designs appear to take into account every conceivable situation. Presently available materials seem adequate to meet requirements. The role of bacterial plaque control in the maintenance of all pontic materials and designs must be recognized. What is required is a dentist cognizant of the reasons for using a particular pontic in a particular situation and a patient highly motivated and instructed as to his responsibility in caring for this component of his prothesis.
American Dental Association↗
Denture psychology in the Talmud.
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Denture, Partial↗
Temporary resin bonded fixed multiple tooth prosthesis.
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Acrylic Resins↗
[Advantage of porcelain teeth in removable prostheses].
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Dental Porcelain↗
Dynamic viscoelastic properties of models composed of posterior denture teeth and denture base resin.
The purpose of this investigation was to compare the dynamic viscoelastic properties of various models composed of denture teeth and heat-cured denture base resin. The specimens were porcelain and resin teeth mounted in denture base resin. Compressive dynamic stiffness and phase differences were measured with a viscoelastic spectrometer. Measurements of the viscoelastic frequency spectrum based on the fast Fourier transform of displacement to applied random forces were analyzed with a spectrum analyzer. The stiffness of the specimens was independent of the frequency. The stiffness of the porcelain specimens was higher than that of the resin ones measured under the same conditions. The phase lag of the specimens was dependent on the frequency. The phase lag of the porcelain specimens was lower than that of the resin ones measured under the same conditions. This study suggested that the acrylic resin teeth had greater toughness and higher shock-absorbing ability than the porcelain teeth, and that the porcelain teeth were more brittle than the acrylic resin ones, whether the teeth were isolated or in dentures.
Acrylic Resins↗
Replacement of a tooth with a fiber-reinforced direct bonded restoration.
Today's methods and materials for tooth replacement are multiple and varied. Modern materials now allow for highly conservative abutment preparations that can retain bonded single tooth replacement fixed prostheses. A case report is presented in which fiber reinforced with composite resin was used for placement of a three-unit fixed long-term provisional restoration, providing fracture resistance while achieving an esthetically pleasing, durable restoration.
Aged↗
An examination of the stress distribution in a soft-lined acrylic resin mandibular complete denture by finite element analysis.
PURPOSE: The aim of this study was to calculate the effect of a soft liner on stress distribution within a mandibular complete denture. Although patients have welcomed soft-lined complete dentures, early fracture is one of the main reasons for failure. To minimize and prevent prosthesis fracture, the understanding of the stress distribution within a prosthesis is important. MATERIALS AND METHODS: A 3-dimensional finite element model of a mandibular complete denture for a severely reduced residual alveolar ridge was constructed. The stress was calculated with linear static finite element analysis. The stress distribution in the soft-lined acrylic resin mandibular complete denture was compared with that of a conventional acrylic resin denture. The resulting stresses were displayed in terms of von Mises equivalent stress and the major principal stresses according to 5 different loading conditions: vertical loads in premolar, molar, and incisor regions; and oblique loads in premolar and molar regions. RESULTS: Oblique loads produced higher levels of stress in the labial notch regions than vertical loads, where tension was the primary mode of stress. Significantly reduced levels of von Mises stress were calculated in soft-liner layers under all loading conditions. Acrylic resin denture base portions, however, exhibited higher levels of von Mises stress in soft-lined complete dentures. CONCLUSION: Three-dimensional finite element analysis gave a realistic explanation of denture fractures and patient response to mandibular complete dentures with and without soft linings. Control of excess lateral occlusal contact might be helpful to reduce the probability of a fracture in soft-lined mandibular complete dentures.
Acrylic Resins↗
Bond strength of denture teeth to denture base resins.
PURPOSE: The study examined the bond strength between 2 types of denture teeth and 3 denture base resins. The denture teeth were untreated, prepared with diatorics, or treated with dichloromethane, a solvent. MATERIALS AND METHODS: Conventional denture teeth and cross-linked denture teeth were bonded to either a heat-cured denture base resin, a microwave-cured denture base resin, or a pour-type denture base resin. Compressive load was applied at 45 degrees on the palatal surface of each tooth until fracture. RESULTS: Conventional resin teeth possessed higher bond strength than cross-linked denture teeth. The heat-cured denture base resin significantly surpassed the microwave-cured denture base resin in bond strength. Both materials were better than the pour-type resin. The application of dichloromethane resulted in a significantly better improvement in bond strength compared to the use of diatorics. CONCLUSION: It is recommended that dichloromethane be applied on the denture teeth ridge-lap area prior to denture base processing.
Acrylic Resins↗
The effect of placement and quantity of glass fibers on the fracture resistance of interim fixed partial dentures.
PURPOSE: Polymers used in interim fixed partial dentures (FPD) have recently been reinforced with fibers. The aim of this study was to determine the influence of the position of the fiber reinforcement on the fracture resistance of interim FPDs. In addition, the influence of quantity of fibers and the length of span of the FPD on the fracture resistance was investigated. MATERIALS AND METHODS: FPDs were fabricated from a resin mixture of polyethylmethacrylate powder and n-butylmethacrylate liquid. Five FPDs from each group were made, and the FPDs were stored in water for 30 days before testing. The FPDs in the control group were unreinforced, and in the other groups the FPDs were reinforced either with two or three unidirectional continuous glass-fiber reinforcements and one woven glass-fiber reinforcement. Different quantities of fibers were used and the fibers were placed in different locations in the FPD. The load was applied to the FPD by a steel ball placed in the cavity in the middle fossa of the pontic tooth. RESULTS: The load required to fracture the unreinforced FPDs varied from 372 to 1061 N. Mean fracture load of reinforced FPDs varied from 508 to 1297 N. One-way analysis of variance showed that the length of span and the quantity of fibers significantly affected the fracture load (P < 0.001, n = 5). By lengthening the span of the FPD, the reinforcing effect of glass fibers became more obvious. CONCLUSION: The results of this study suggest that the effectiveness of glass-fiber reinforcement is most evident in interim FPDs with long spans and that the positioning of reinforcement considerably influences the strength of the FPD.
Analysis of Variance↗
Bonding durability of conventional resinous denture teeth and highly crosslinked denture teeth to a pour-type denture base resin.
PURPOSE: The study examined the bond strength between 2 types of resin denture teeth and a pour-type denture base resin after thermocycling. The denture teeth were untreated, prepared with diatorics, or treated with a solvent, dichloromethane. MATERIALS AND METHODS: Conventional denture teeth and crosslinked denture teeth were bonded to a pour-type denture base resin. Compressive load was applied at 45 degrees on the palatal surface of each tooth until fracture. The teeth were either thermocycled or not thermocycled. Porcelain teeth were also tested for comparison. RESULTS: There was no significant difference in bond strength between the conventional resin teeth and the crosslinked denture teeth. Thermocycling significantly decreased the bond strength of the 2 types of resin teeth but had no effect on porcelain teeth. The application of dichloromethane significantly improved the bond strength of the 2 types of resin teeth either before or after thermocycling. CONCLUSION: It is recommended that dichloromethane be applied on the denture teeth ridge-lap area prior to denture base processing.
Analysis of Variance↗
Effect of surface treatments on the bond strength between composite resin and acrylic resin denture teeth.
PURPOSE: This investigation studied the effects of 3 surface treatments on the shear bond strength of a light-activated composite resin bonded to acrylic resin denture teeth. MATERIALS AND METHODS: The occlusal surfaces of 30 acrylic resin denture teeth were ground flat with up to 400-grit silicon carbide paper. Three different surface treatments were evaluated: (1) the flat ground surfaces were primed with methyl methacrylate (MMA) monomer for 180 seconds; (2) light-cured adhesive resin was applied and light polymerized according to the manufacturer's instructions; and (3) treatment 1 followed by treatment 2. The composite resin was packed on the prepared surfaces using a split mold. The interface between tooth and composite was loaded at a cross-head speed of 0.5 mm/min until failure. RESULTS: Analysis of variance indicated significant differences between the surface treatments. Results of mean comparisons using Tukey's test showed that significantly higher shear bond strengths were developed by bonding composite resin to the surfaces that were previously treated with MMA and then with the bonding agent when compared to the other treatments. CONCLUSION: Combined surface treatment of MMA monomer followed by application of light-cured adhesive resin provided the highest shear bond strength between composite resin and acrylic resin denture teeth.
Acrylic Resins↗
A modified indirect working die technique for fabricating provisional restorations for multiple teeth.
The "modified" indirect working die technique is introduced. The technique expands the capabilities of the indirect working die technique, which features flexible removable dies for fabricating provisional restorations. The modified technique is distinguished by its potential for restoring multiple teeth, up to and including the complete arch, by utilizing a complete-arch impression tray to which a simple modification is made. It is an accurate, timesaving, and laborsaving method for fabricating provisional restorations.
Acrylic Resins↗
[Discussion on the engineering problems in oral implantology].
The engineering problems in oral implantology are discussed in this paper. The problems discussed include the comparison among implants of different shapes, the influence of lengths and diameters of implants on the biomechanics properties of interface, the influence of pitches and tooth angles of threaded implants on the biomechanics properties of interface, the influence of methods of surface treatment and surface topography of implants on the biomechanics properties of interface, the characteristics of implant denture design, the application of picture treatment technology and solid model manufacturing technology in implant denture reconstruction.
Biomechanical Phenomena↗