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PubMed1995

Oral health status of a population of community-dwelling older Canadians.

A sample of 170 responsive residents of seniors housing centres in Winnipeg, Canada, were studied, (>65 years, mean 82 years), with the objectives of relating their dental state to their perception of need and uptake of service. Only 6% rated their oral health as poor, 46% reported a dental visit within the previous year and 68% felt they needed dental treatment. A lack of perceived need (88%) was the primary reason why dental care was not sought more frequently. Hygiene practices revealed that only 7% brushed < 1 time/day, 60% never flossed, 14% cleaned their dentures <1 time/day, and 42% slept with their dentures. Dental histories showed that examination (94%), prosthodontic treatment (76%), and restorative services (65%) were the most commonly sought treatments. Perceived dental needs included prosthodontic treatment (39%), periodontal/prophylactic treatment (10%), restorative treatment (9%) and pain relief (9%). Study subjects had 2.8 decayed teeth, a DMFT of 25.1, and a Root Caries Index of 38%. CPITN scores of 3 or 4 in at least one sextant were found in 80% of subjects. Of the 41% edentulous, all wore complete dentures but 15% of complete upper dentures and 51% of complete lower dentures fitted poorly. Of the partial dentures, 20% fitted poorly. Soft tissue anomalies were seen in 67% of subjects and 47% had TMJ anomalies. Overall, 77% of edentulous subjects and all dentate subjects required some dental treatment even though 46% had seen a dentist within the preceding year. It is concluded that appropriate management of such people needs further attention.

Aged↗
PubMedDate not supplied

[Analysis of the most common causes of failure in complete dentures].

The most frequent failures in complete denture construction are examined. All possible failures have been taken into con- been divided into 3 groups: failures in denture retention, in interocclusal relations and factors which are reducing denture stabilization. Failures in the lower complete denture retention with poor extension have been most frequently found (90% cases). Less frequent was poor extension of the upper complete denture. Disbalance such as excentric occlusion and articulation blocking have been frequently found. A sizable vertical occlusal dimension was also significant.

Dental Occlusion↗
PubMed1995

Centre and magnitude of vertical forces in complete denture wearers.

The aim of this study was to examine the centre and magnitude of a vertical component of occlusal forces in complete denture wearers during several activities using a newly developed method. A lower complete denture was divided into upper and lower parts parallel to the occlusal plane. They were connected by four force transducers which were embedded in the first premolar and the second molar portions on both sides of the denture base. Forces were recorded during tapping, chewing peanuts and raisins, and clenching. The centre and the magnitude of the forces were calculated from forces recorded by the four transducers. The maximum error of the centre was 1 mm, and the maximum error of the magnitude was 4%. The centre was observed between a first molar and the middle of the edentulous dental arch. Maximal mean value of the forces during chewing was 65-110 N.

Aged↗
PubMed1980

Location of the allergenic monomer in warm-polymerized acrylic dentures. Part II: Experiments aimed at establishing guidelines for production of acrylic dentures suited for patients allergic to acrylic monomer and complementary investigations.

An account has been given of a patient with denture sore mouth caused by allergy to the denture material (Part I). In the continued investigation the residual monomer or part thereof was found to be the allergen. Patch testing of the skin with drillings from the upper and lower dentures made of a "warm-polymerized" methyl methacrylate resin was carried out with special reference to the topography of the distribution of the allergenic factor within the dentures. Only that surface of the upper denture that is in contact with the hard palate and the maxillary crista were allergenic. All other surfaces of the upper denture as well as the complete lower denture were non-allergenic. The resin was, in other words, inhomogeneous as regards the allergenic factor. An analysis of the test castings showed that the allergenic properties in the resin are located in the surface and that the resin was free from allergens below the "allergenic film" (Parts I and II). A non-allergenic, extraordinarily well-fitting denture was produced from the same make of acrylic as that used for the non-tolerated denture. It was made by a new technique, "directed polymerization," comprising initial application of heat centrally in the cuvette (a metal cup surrounding the gypsum), including tin-foiling of the palatal half of the mould. The production of the denture was based on experience from tests with test castings. A check-up 18 months later showed no stomatitis and the retention and stability of the denture were very satisfactory, and tests with the original model of the upper gum showed that it had an excellent fit.

Acrylic Resins↗
PubMed2006

Prevalence of temporomandibular disorder signs in patients with complete versus partial dentures.

OBJECTIVES: To determine the prevalence of signs of a temporomandibular disorder (TMD) in completely edentulous patients wearing upper and lower complete dentures (CD) and to compare this to the prevalence of signs in partially edentulous patients wearing upper and lower clasp-retained acrylic removable partial dentures (RPD). MATERIALS AND METHODS: A questionnaire and a clinical examination were used to assess 200 patients. One hundred of these were complete denture wearers being treated for the provision of replacement CD. The other 100 patients were partially edentulous patients, who had RPD replacing upper and lower partially missing teeth and their supporting structures. RESULTS: It was shown that there was a statistically significant difference between the two groups regarding the presence of temporomandibular signs. Partially edentulous patients wearing upper and lower RPD had a significantly higher prevalence of TMD signs than edentulous patients wearing CD (36% compared to 17%). They also exhibited significantly (P<0.04) more signs of joint tenderness (18%) on clinical examination compared to (5%) only in the CD-wearing patients. Tenderness upon palpation in the periauricular region was the most common site reported in both groups. CONCLUSIONS: The partially edentulous patients (wearing RPD) exhibited more TMD signs when compared with the CD-wearing patients. Significantly, more partially edentulous patients had joint tenderness (P<0.04) than did CD-wearing patients. The masseter muscle most commonly demonstrated muscle tenderness.

Adult↗
PubMed1995

Patient satisfaction and chewing ability with implant-retained mandibular overdentures: a comparison with new complete dentures with or without preprosthetic surgery.

PURPOSE: The objective of this study was to compare denture satisfaction and chewing ability of edentulous patients treated with dental implant-retained overdentures or with full dentures with or without previous preprosthetic surgery. PATIENTS AND METHODS: This study was a controlled clinical trial. Thirty-eight men and 52 women participated in the study. The mean height of the anterior mandible was 21 mm (range, 16 to 25 mm), measured on a lateral cephalometric radiograph. The subjects were randomly assigned to the three treatment modalities. The main outcome measures were denture satisfaction and chewing ability, which were assessed using questionnaires focusing on denture-related complaints and the ability to chew different types of food, and an overall denture satisfaction score. RESULTS: Based on the baseline data from the "denture complaints" and "chewing ability" questionnaires, nine interpretable factors could be extracted. Two factors did not vary following treatment and were excluded from the outcome analysis. At the 1-year evaluation five of seven factors showed significantly better scores for the two surgical groups than for the control group. The same was found for the overall denture satisfaction rate. CONCLUSION: Overdentures retained by dental implants or complete dentures made after a vestibuloplasty and deepening of the floor of the mouth provide a more satisfactory solution for denture-related problems than complete dentures alone. For the scale "functional complaints lower denture," the overdenture group showed even a significantly better score than the preprosthetic surgery group.

Cephalometry↗
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↗
PubMed2004

Fixed rehabilitation of a patient with hypohidrotic ectodermal dysplasia using zygomatic implants.

We found few references in the dental literature on implant rehabilitation of patients with hypohidrotic ectodermal dysplasia and only 1 case on zygomatic fixations and maxillary prosthesis in a patient with hypohidrotic ectodermal dysplasia. Two zygomatic fixations were placed according to the sinus slot technique, together with 3 implants in the anterior maxillary region. After 6 months, an upper complete prosthesis was screwed onto the implants, and lower overdentures were placed over the remnant canines. After 18 months of follow-up the patient reported important improvement in oral function and self-esteem.

Adult↗
PubMed1991

Effect of wearing complete dentures on human palatal mucosal blood flow measured by 133Xe clearance.

In eight edentulous subjects, who had not previously worn dentures, blood flow was measured by 133Xe clearance after intramucosal injection. Upper and lower complete dentures were then constructed for these subjects, and 133Xe clearance was measured after the dentures had been worn for 7 and 40 days. Before the insertion of dentures the mean blood flow to palatal mucosa was 18.9 +/- 7.1 ml/100 g/min. Seven and 40 days after wearing dentures the mean flows to the palatal mucosa were 10.6 +/- 4.5 and 12.6 +/- 5.3 ml/100 g/min, respectively. The difference before and after wearing dentures was statistically significant (p less than 0.05). The subjects were asked not to wear the dentures for 24 h after the third visit on the 40th day whereupon the blood flow reached almost normal levels (16.2 +/- 5.45 ml/100 g/min). The findings show that wearing dentures hinders the blood supply to the palatal mucosa, and that after resting the oral tissues, blood flow may return to normal levels.

Blood Flow Velocity↗
PubMed1995

Satisfaction with complete immediate dentures and complete immediate overdentures. A 1 year survey.

The aim of this study was to evaluate denture satisfaction over a 1 year period after extraction of the last teeth. Seventy-four patients who required immediate denture therapy in the mandible were randomly treated, (1) with complete immediate dentures (22); (2) with immediate overdentures on two lower canines without attachments (26); or (3) with immediate overdentures on two lower canines provided with Dyna direct magnetic attachments, inserted on the abutments 9 months after treatment (26). Denture satisfaction was estimated by means of questionnaires, filled out by each patient at certain periods, starting before treatment and ending 1 year after denture insertion. After 1 year approximately 85% of the patients in the three groups were satisfied with their dentures, had got used to them and could eat well. This phenomenon was constant over the whole first year period. No differences in denture satisfaction were found between the three groups. It can be concluded that although patients who receive immediate complete dentures might experience a lot of discomfort during the first year of edentulousness, they are satisfied, in general, with their dentures independent of the treatment procedure.

Adaptation, Psychological↗