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At least 91 records · Page 5Linked to original sources
PubMed1995

Oral findings in elderly nursing home residents in selected countries: quality of and satisfaction with complete dentures.

A total of 249 complete denture wearers were examined from a geriatric population of 610 patients in seven institutions in four different countries. The evaluation of denture quality was made by the patients' opinions and the examiners rankings with a questionnaire on interocclusal distance, occlusal function, extension, stability, comfort, and esthetics of the dentures. At each of the surveyed institutions, the patients consistently considered their dentures better than did the examiners and the maxillary dentures were rated better that the mandibular dentures by the clinicians and by the patients.

Aged↗
PubMed1977

Complete denture occlusion.

The occlusion for complete dentures discussed in this article is based on basic principles and concepts that have been studied, tested, refined, and applied successfully by dentists for years. This should simplify rather than complicate the selection of the proper posterior tooth form for each patient's edentulous condition, the the modification of the teeth, and the use of the many occlusal schemes. The problem of occlusion is the dentist's responsibility and cannot be shared or relegated to nonprofessionals. The motivation for this article has been the hope that it will help the dentist recognize, analyze, and apply sound procedures in managing the problem. Only after this has been skillfully accomplished has the dentist assumed his full professional responsibility to the patient.

Acrylic Resins↗
PubMed2001

[A clinical investigation into the effect of comfort denture adhesive on masticatory function with complete dentures].

OBJECTIVE: The purpose of this study was to evaluate the clinical effect of the new developed form of Comfort denture adhesive (Comfort DA). METHODS: 10 edentulous patients with complete dentures were selected for this study. The maximum biting force and masticatory efficiency were recorded before and after application of the adhesive to all the new and old dentures. Subjective test was also used to evaluate this adhesive in enhancing retention and stability of complete denture using the questionnaire way. RESULTS: The data indicated that significantly greater biting forces were generated with old dentures than with the new dentures. The major findings were that the adhesive produced a statistically significant improvement in the masticatory efficiency after application. Subjective views of the patients indicated that this tested product significantly improved denture retention, stability and had other favorable features. The time of adhesion was about 6 8 hours. CONCLUSION: The generally favorable clinical performance of the developed Comfort DA formulation indicated that it might be an efficacious denture adhesive.

English Abstract↗
PubMedDate not supplied

Randomized controlled clinical trial for verifying the effect of silicone-based resilient denture liner on the masticatory function of complete denture wearers.

PURPOSE: The purpose of this study was to investigate whether application of permanent silicone-based resilient denture liner (SR) to mandibular complete dentures significantly improves patients' masticatory ability compared to conventional heat-activated acrylic resin (AR). MATERIALS AND METHODS: Twenty-eight edentulous patients were randomly placed into 1 of 2 crossover groups (AR-SR/SR-AR) by using a random permuted block within strata method. The AR-SR group received AR denture treatments followed by SR denture treatments. The SR-AR group received treatments in the reverse sequence. The outcomes were classified by matiscatory performance, mandibular movement, electromyographic activity, and maximum occlusal force. RESULTS: No significant differences were observed in any of the baseline characteristic measurements between groups. SR denture wearers exhibited significantly higher masticatory performance than AR denture wearers. SR denture wearers exhibited a longer early-stage occluding period than AR denture wearers. There were no differences in electromyographic activity between the AR and SR groups. There were no significant differences in maximum occlusal force between the AR and SR groups. CONCLUSION: This study showed that the application of SR to mandibular complete dentures resulted in significant improvements to the patients' masticatory ability compared to AR.

Acrylic Resins↗
PubMed2004

[Selection of occlusal scheme on the basis of pressure distribution on supporting structures under complete dentures].

In case of making complete dentures, we have to consider not only denture stability but also the restoration of aesthetics and function such as mastication and speech. However these are contradictory theoretically from the point of view of denture stability, and it is very difficult to satisfy both requirements in the case of a patient who has poor upper and lower alveolar ridges. We investigated the effect of artificial posterior teeth form and occlusal scheme on the distribution of pressure on supporting structures under complete dentures during mastication with upper and lower edentulous simulators. In this report, a guideline for the selection of occlusal scheme for complete dentures, based on our previous investigations, is described. The occlusal scheme remarkably affected the distribution of pressure under simulated complete dentures, as shown by comparing the distribution of pressure using two different occlusal schemes:fully balanced occlusion and lingualized occlusion. However other factors such as posterior teeth form and position affect the distribution of pressure as well, and are related to each other. Therefore, not only occlusal scheme but also posterior artificial teeth form has to be considered, and the form of posterior teeth should be carefully and comprehensively decided when making complete dentures.

English Abstract↗
PubMed2004

Functional impression and jaw registration: a single session procedure for the construction of complete dentures.

The conventional fabrication of complete dentures involves two separate clinical sessions for functional impression making and jaw registration. The presented method combines both procedures in one session. The aim of this study was to survey the three-dimensional tooth positions in complete dentures with reference to the ridges to establish arbitrary guideline values that could be used for the manufacturing of tooth-position analogue plastic rims on functional impression trays. New complete dentures were fabricated by supervised undergraduate students in the conventional manner for 104 edentulous patients. The position of the maxillary teeth was surveyed in the horizontal plane using the Schmuth 'vizor-measuring plate'. The vertical dimension of occlusion, represented as the distance between opposing ridge areas of the dentures in maximum intercuspation, was measured at different sites by means of a Gutowski gauge. The tooth positions on the dentures varied widely, e.g. the horizontal distances between the incisive papilla and the maxillary incisors was 7.1 +/- 2.3 (3-14) mm. The vertical dimension of occlusion, which is most important in the jaw registration, varied equally with an anterior inter-alveolar distance between 12 and 33 (20.4 +/- 4.0) mm. Arbitrary moulding of the tooth position-analogue plastic rims does not seems to be an ideal method of pre-shaping functional impression trays, because the individual anatomical variation is considerable. Alternatively, the horizontal and vertical tooth positions of functionally and aesthetically pleasing dentures should be measured to pre-shape the rims of functional impression trays in the maxillary and the mandibular jaw. Such trays are a valuable tool for functional impressions and an immediate preliminary jaw registration in the fabrication of new complete dentures. This method allows a first try-in of the full set-up in the third clinical visit without loosing precision.

Adult↗
PubMed1997

Tongue motor skills and masticatory performance in adult dentates, elderly dentates, and complete denture wearers.

STATEMENT OF PROBLEM: For complete denture wearers the tongue plays an important role in the retention and stability of dentures and has a great influence on masticatory function. PURPOSE OF STUDY: The purpose of this study was to elucidate the relationship between tongue motor behavior and masticatory function. MATERIAL AND METHODS: Thirty healthy, normal adult dentates, 10 normal elderly dentates, and 20 complete denture wearers whose dentures were constructed by the same methods and materials were selected. Tongue motor skills were examined by an ultrasound system and masticatory performance was evaluated by the sieving method. RESULTS: The tongue motor skills of elderly dentates and complete denture wearers were statistically lower compared with those of adult dentates (p < 0.05, Duncan test). Tongue motor skills of complete denture wearers were statistically correlated with age (p < 0.01). Masticatory performance was statistically lower in relation to age in complete denture wearers (p < 0.01). The correlation coefficient was 0.74 between tongue motor skill and masticatory performance in complete denture wearers, which was statistically significant (p < 0.01). CONCLUSION: Age-related decreases in tongue motor skills and masticatory performance were demonstrated by ultrasound observations and sieving methods.

Adult↗
PubMed1987

Pressures recorded at the denture base-mucosal surface interface in complete denture wearers.

This study reports on pressures recorded at the denture base-mucosal surface interface in four edentulous subjects. Four sites were selected, namely (a) the midpalatal region in the upper complete denture, (b) the labial to the mid-line lower complete denture, (c) directly under the lower left and (d) right first molar teeth. The study examined the reproducibility of the pressure values obtained when the subjects chewed two test foods (carrot and peanut). The subjects repeated the chewing sequences on the same day and one subject was tested over a 3-day period. The younger subjects and subjects with the shortest chewing sequences gave the most reproducible results. The two foods were shown to have different effects both on the pressure values recorded and the duration of the chewing sequence. Patients who transferred the food bolus from side to side during the chewing sequence affected the reproducibility of the results obtained from the lower denture transducers.

Dental Occlusion↗
PubMed2006

Comparison of the midline stress fields in maxillary and mandibular complete dentures: a pilot study.

STATEMENT OF PROBLEM: Complete dentures typically fracture along the midline due to crack initiation and propagation from stressed areas. Therefore, it is important to characterize the magnitude and direction of maximum stresses developed in the midline of dentures. PURPOSE: The purpose of this pilot study was to determine the midline stress field of a mandibular complete denture under different loading conditions, and to compare this with the corresponding field of a maxillary denture to identify whether significant differences in maximum stresses between these 2 stress fields are responsible for the higher rate of failure seen clinically in maxillary dentures. MATERIAL AND METHODS: The identical casts used in this study were fabricated with commercial molds. Two complete acrylic resin dentures (1 maxillary and 1 mandibular) that were used in a previous study were selected as prototype dentures for this study. The mandibular acrylic denture was used to fabricate a 2-piece mold from silicone (upper half) and polymethyl methacrylate (PMMA) sheets (lower half) that was subsequently used to produce 3 identical mandibular complete dentures. The single maxillary acrylic denture was used to load the mandibular dentures. A rosette strain gauge was cemented onto the midline of each of the 3 mandibular dentures. The test conditions, including the fabrication of the casts used to induce loads, simulation of oral mucosa, loading procedure, strain measurement, and stress calculations, were identical to those used in a previous investigation of maxillary complete dentures to allow a direct comparison between maxillary and mandibular dentures. The Mann-Whitney test (alpha=.05) was used to quantify the differences in the stress magnitudes between maxillary and mandibular complete dentures. RESULTS: The stresses in the mandibular denture differed both qualitatively and quantitatively from those in the maxillary denture. The midline stress field of the mandibular complete denture was characterized by 2 low compressive principal stresses and a low maximum shear stress, whereas the corresponding stress field of the maxillary complete denture was characterized by a high principal tensile stress and a high shear stress. These differences between the stresses of maxillary and mandibular dentures were statistically significant (P<.001). CONCLUSION: The differences in stress patterns between mandibular and maxillary complete dentures as determined by this study, which also used data from a previous study, may be the primary reason why maxillary dentures fracture more often than mandibular dentures.

Acrylic Resins↗