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PubMed1997

[Denture mobility of complete dentures during function].

The purpose of this study was 1) to verify and apply a system to measure the three-dimensional (3-D) movement of the upper and lower complete dentures and the movement of the mandible with six degrees of freedom, and 2) to analyze the relationship between denture movements and the path of closure of the mandible during functions. A 3-D motion capture system with four infrared TV cameras was used for this purpose. The loci of each of three targets on the subject's head, the upper dentures, the lower dentures, and the mandible were measured three-dimensionally. The relationship between the lower dentures and the mandibular movements was analyzed in the change of the inner product of normal vectors of the denture occlusal planes and mandibular planes. The results were as follows: This system could measure the denture mobility within 3.5 x 10(- 1) mm in error. The mobility of the upper dentures had a correlation to the path of closure of the mandible regardless of the working side or nonworking side, and the lower dentures had a tendency to move toward the working side.

Aged↗
PubMed2000

Tooth loss and the condition of the prosthodontic appliances in a group of elderly home residents.

The study assessed the number of missing teeth, the state of the existing prosthodontic appliances and the need for their replacement. Dental status and anamnesis were taken on a group of 120 elderly home residents by trained examiners. Prosthodontic appliances were evaluated according to the Karlsson's index for the crowns and bridges, and according to the modified Nevalainen et al. index for the evaluation of the complete dentures, as well as the need for prosthetic treatment. The most persistent teeth in both jaws were lower canines, while the most commonly missing teeth were lower first molars. On average, the crowns were older and in poorer condition than the bridges. Lower complete dentures had better stability but were also less retentive in comparison with the upper complete dentures. More than 82% of the subjects were in need of either fixed, removable or combined prosthodontic treatment. The high prevalence of needs for prosthodontic treatment pointed to the requirement for frequent dental check ups within elderly home residents in order to better identify and meet their dental needs.

Aged↗
PubMed1997

[The influence of teeth positions to lower complete denture retention and health of supporting tissues].

Three kinds of three dimension finite element models of edentulous mandibile and the complete denture were established to investigate the influence of artificial teeth positions to denture retention and the supporting tissue. Ten myodynamic and traditional complete dentures were constructed to compare the difference of artificial teeth positions to alveolar ridge. The results indicated: 1. The stress was not obvious different in mandible when teeth were placed over the crest of the ridge or moved lingually or buccally to the ridge in 3 mm; 2. Under occlusion force, it was beneficial for the lower supporting tissue with artificial molars being placed over the slope of mandible and beneficial for denture retention with molars teeth being placed on the crest of ridge buccally; 3. With the effects of oral muscles, the teeth on the crest of ridge buccally or lingually in 3 mm in molar and premolar regions were respectively available; 4. There were obvious difference in arch width of artificial teeth arrangement between traditional and myodynamic complete dentures, the arch was wider in myodynamic complete denture than that of traditional complete denture at molar region.

Denture Retention↗
PubMed1996

Fracture surface characteristics of damaged acrylic-resin-based dentures as analysed by SEM-replica technique.

The aim of this study was to determine some characteristics of the fracture surface of an acrylic resin denture. For this purpose, five complete upper dentures and two complete lower dentures that had fractured into two pieces were collected, the fracture surfaces were duplicated with the SEM-replica technique and duplicated surfaces were investigated with a scanning electron microscope. The reproducibility of the SEM-replica technique was tested by comparing one original sample surface and its replica surface of the same area. The SEM-photomicrographs revealed a series of fine striations in the fracture surfaces of both the upper and lower dentures perpendicularly orientated to the direction of the fracture propagation. A smooth area on the fracture surface was assumed to indicate a slow fatigue fracture process, and a rougher area fracturing with increased velocity.

Dental Restoration Failure↗