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At least 145 records · Page 8Linked to original sources
PubMed1994

Denture fracture--a survey.

The fracture of dentures is an unresolved problem. Despite increasing costs incurred by the nation on the repair of these prostheses, very little has been documented on the type of fracture encountered. This survey was carried out to determine the prevalence of type of fracture by the distribution of questionnaires to three different laboratories. Results obtained showed that 33% of the repairs carried out were due to debonded/detached teeth. Twenty-nine per cent were repairs to midline fractures, more commonly seen in upper complete dentures. The remaining 38% were other types of fractures, the majority of which constituted repairs to upper partial dentures. The latter involved detachment of acrylic resin saddles from the metal in metal based dentures and the fractures of connectors in the all-acrylic resin partial dentures.

Acrylic Resins↗
PubMed1992

[Mechanical property and adaptability of super-plastic titanium alloy denture base].

The purpose of this study is to investigate the mechanical property and the adaptability of the upper complete denture bases made by superplastic forming of Ti-6A1-4V alloy plates which have various thicknesses. The strength of the denture base made by superplastic forming using the 0.55 mm thickness plate was lower than that of the base made by Co-Cr alloy casting in the standard form when loaded on the hard metal board. But by increasing the thickness by partial or full diffusion bonding of two Ti-6A1-4V alloy plates, the denture base became stronger than the Co-Cr alloy base. With resin occlusion rims, all the denture bases were reinforced. Moreover, when loaded on the mastermodel covered with rubber in the residual ridge and palate area, the difference of the strain between the thin and the thick bases became small. However, the strain of the thin base increased particularly when the base had a contact with the mastermodel on a small area in the palate. The superplastic forming denture bases revealed a high adaptability with the space less than 0.13 mm on the average between the base and the mastermodel. And increasing the thickness of the base prevented the worsening of the adaptability after curing resin for the denture.

Biomechanical Phenomena↗
PubMed1992

Swallowing activity of lip muscles in patients with a complete upper and a partial lower denture.

In 30 partially edentulous subjects provided with an immediate complete upper and a partial lower free-end denture the lip activity in swallowing was studied before and after denture treatment and during a 2-year period of denture wearing. Electromyographic recordings of the right side upper and lower orbicularis oris, mentalis and anterior temporal muscles were obtained during swallowing saliva and during swallowing of water with and without the dentures in the mouth. In the different types of swallows recorded, the lower lip and mentalis muscles showed much stronger activity than the upper lip and anterior temporal muscles and also initiated the swallowing activity. No significant changes in mean voltages of the swallowing activity were observed during the 2-year observation period. On the other hand, the durations of the swallows showed marked increases after 1 year of denture use, when no further rebasings of the complete upper denture had been made.

Adult↗
PubMed1976

Late results of treatment with partial dentures. An investigation by questionnaire and clinical examination 13 years after treatment.

Ninety-nine people who were fitted with partial dentures in 1959 were invited to take part in an investigation 13 years later. A questionnaire was answered by fifty-eight, which means a frequency of 81% if allowance is made for an explainable loss. Of the sixty-eight partial dentures in these fifty-eight patients, twenty-three were still being used, fourteen patients had had their original partial dentures replaced by new ones and three by a fixed bridge, while seven had been replaced by complete dentures. Twenty-one were no longer used and had not been replaced. Of the fifty-four patients who originally had a complete upper denture and a partial lower denture, thirty were still available. Following an invitation to take part in a clinical review, twenty-seven (90%) co-operated. Most of the patients were in need of treatment (for caries, periodontitis and/or prosthetic treatment). The periodontal injuries were rarely serious. A correlation was found between good oral hygiene and good results of treatment.

Denture, Complete↗
PubMed1990

[Polymerization shrinkage of denture resins in different preparation procedures].

The Intention of this study was to examine and compare the effect of three different polymerization systems on the dimensional changes of denture-resin. The development of the fissure has been measured at five fixed points at the posterior border of upper complete dentures after a 4-weeks'-storage in water and saliva respectively. The perform-Inkovac-System showed the best, the SR-Ivocap-System the most unfavorable results; the conventional "stuff-press-system" gave only medium satisfaction.

Denture Bases↗
PubMed1989

[Occlusal contacts of complete denture during mastication in telemetry system].

The purpose of this study was to develop a telemetry system and to analyze the occlusal contacts of complete denture during mastication. The telemetry system consisted of a transmitter unit and a receiver unit. The transmitter allowed 6 channels of information of the occlusal contacts to be telemetered by time division multiplex communication method within the approximate distance of 2 m. The occlusal surface of the upper complete denture was made of metal and that of the lower denture was made of metal contact plates of 0.5 mm in width with each space of 0.5 mm. Then the transmitter was embedded in the lower complete denture. Occlusal contacts of 66 aged edentulous male were investigated both on the chewing side and on the nonchewing side in the premolar, the 1st molar and the 2nd molar regions. The results were as followed: 1. The occlusal contacts in the nonchewing side preceded those in the chewing side, with higher frequency and longer duration. 2. In the nonchewing side, the occlusal contact occurred at different time; the occlusal contact was observed first in the 2nd molar, then 32-48 ms later in the 1st molar, and 2-48 ms later in the premolar regions. 3. It is suggested that the balancing contact should be considered for stabilizing the denture in mastication.

Dental Occlusion↗
PubMed1985

Masticatory efficiency and dental state. A comparison between two methods.

The masticatory efficiency of subjects with all natural teeth, with complete upper and partial lower dentures, and with complete dentures was measured. Two different methods were used. The results showed significant differences among the groups irrespective of the method used. The subjects with dentures compensated for decreasing masticatory efficiency by using more strokes when chewing until swallowing. Great interindividual differences were found within groups with similar dental states. There was no or weak correlation between the two methods. A value from one method corresponded to a large range of values in the other method and vice versa.

Adolescent↗
PubMed1997

Restoration of the edentulous maxilla.

A case is presented which highlights the problems encountered when using an implant-stabilised overdenture in an edentulous upper jaw, opposed by a natural dentition.

Aged↗
PubMed1994

Transverse strength and fatigue of denture acrylic-glass fiber composite.

OBJECTIVES: The aims of this experiment were: 1) to test the effect of a high concentration of continuous glass fibers on the transverse strength of test specimens made of heat-cured acrylic resin; and 2) to determine the fatigue weakening of both unreinforced and continuous glass fiber-reinforced specimens of heat-cured acrylic resin shaped into upper complete dentures. METHODS: A three-point loading test was used to determine the transverse strength of test specimens (n = 30 per group). The fatigue test was the constant deflection test (n = 10 per group). RESULTS: The results revealed that, compared to unreinforced specimens, continuous glass fibers at a concentration of 58 wt% enhanced the transverse strength of the test specimens up to 146% (p < 0.001) and increased the fatigue resistance (p < 0.001) during 5 x 10(5) loading cycles. SIGNIFICANCE: This study suggests that by incorporating glass fibers into PMMA denture bases, the strength of the denture can be increased.

Composite Resins↗
PubMed1979

The prosthodontic rehabilitation of selected adults class III malocclusions.

In a previous paper (Murray 1978) some of the problems associated with currently employed preoperative assessment aids were discussed. Techniques were described for establishing the occlusal vertical dimension of occlusion, and support for the upper lip. The incorporation of these treatment planning aids in the prosthodontic rehabilitation of two adult cases, with class III malocclusions, is reported.

Adult↗
PubMed1979

[The effect of the arrangement of the artificial sets of teeth on the physical stability of total protheses].

The effect of masticatory forces within and outside the stable stress-bearing areas of the complete upper denture on the pressure gradient and the flow of saliva into the space under the prosthesis were demonstrated with standardized tests. It was shown that masticatory stress within the stable area led to a continual increase in pressure in the space under the prosthesis. Masticatory force outside the stable area led to a decrease in pressure and an equalization of pressure in this space as well as dislocation and tilting of the complete denture. Due to masticatory force outside the stable area, the shape of the ridge influences the stability of the complete denture.

Dental Impression Technique↗