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At least 127 records · Page 7Linked to original sources
PubMed2004

Association between nutrition and the prosthetic condition in edentulous elderly.

OBJECTIVES: The aim of this study was to assess the possible risk of malnutrition among the elderly population. SUBJECTS: twenty-three pairs of complete dentures were made for a group of patients and 17 upper complete dentures with implant-supported lower dentures were made for a different group. METHODS: The study was performed at the University of São Paulo--Dental Branch, Brazil. The patients were submitted to a nutritional test, as well as to a clinical examination and interview. Chewing ability and patient's satisfaction with their prostheses were evaluated. The nonparametric statistics proof of chi-squared, level 0.05 was performed and because of the low frequencies. The Fischer test was also used. RESULTS: Patients wearing mandibular implant-supported dentures were considered well nourished (76.47%) when compared with complete dentures users (43.48%). There was a significant difference between the two groups, concerning to chewing ability (chi2 = 5.79) and nutritional status (chi2 = 4.35). CONCLUSION: The risk of malnutrition was higher for elderly wearing complete dentures. The psychological state influences the interest in diet and choice of food.

Aged↗
PubMed1975

Studies on mechanical properties of denture base material laminated with organic fiber reinforced plastics. Part I. Basic consideration of hybrid construction.

Acrylic resin is widely used as a denture base material, but the upper complete denture fails often during use. Therefore, the denture base made from acrylic resin should be reinforced in some way. Therefore, as a new method of reinforcement on the denture base, the authors devised a method to improve the strength and rigidity by laminating the palatal surface of the denture base with an organic fiber reinforced plastic, the so-called canapé construction. In this paper, as the basic experiment, the flexural strength, fatigue strength and the modulus of elasticity in bending of reinforced acrylic resin by the canapé construction were investigated. As the results, the flexural and fatigue strength are improved respectively 160% and 130% compared to the denture base acrylic resin. And the modulus of elasticity in bending is improved 80%. Therefore, it is considered that this new combination of materials using the canapé construction might be sufficiently applied to the denture base.

Acrylic Resins↗
PubMed2001

Reinforcement of maxillary dentures with silane-treated ultra high modulus polyethylene fibers.

Midline fractures appear to be the most common problem in maxillary complete dentures, and they can be prevented by reinforcement of the base material. In this clinical trial, complete upper dentures made, for patients having a history of midline fractures, that were reinforced with ultra-high modulus polyethylene fiber in woven form. This fiber was treated with a silane-coupling agent and sandwiched between acrylic dough. Laboratory procedures were conducted easily and conventionally, without any special equipment. At the end of 18 months, all of the dentures were well accepted and did not show any signs of fracture.

Acrylic Resins↗
PubMed1993

Evaluation of damage to removable dentures in two cities in Finland.

The number of damaged dentures and type of damage to removable dentures repaired in dental laboratories was investigated using a questionnaire sent to 24 dental laboratories in Finland. Eight variables were examined for each damaged denture. The results showed that the type of dentures most commonly needing repair was the complete upper denture (49%). The most frequent type of damage was breakdown of the acrylic base and loosening of an artificial tooth. The chi-square test established a statistical dependence (p < 0.005) between damaged dentures and their age. Damaged upper partial dentures most frequently had natural teeth or fixed prostheses as antagonist teeth. Damaged lower skeletal dentures and acrylic partial dentures had a complete denture as the antagonist (p < 0.05). Removable dentures made of acrylic resin material seemed to break despite strengtheners, such as clasp wire.

Chi-Square Distribution↗
PubMed1983

Reduction of formation of denture plaque by a protease (Alcalase).

The efficacy of a protease preparation (Alcalase, Novo, Denmark) in preventing accumulation of plaque on the fitting surface of complete upper dentures was examined in a double-blind study. Seventeen denture wearers with clinically healthy oral mucosae participated in the study. The protease was dispensed in dissolvent tablets containing 15, 30, 60, 100, 300, 500, or 1000 mg of the enzyme. Enzyme tablets or placebo tablets were dissolved in 150 ml water at 50 degrees C, and the dentures were soaked once daily for 15 min. Denture soaking was performed with or without brushing. The study consisted of 14 1-week periods. At the start of each period the dentures were cleaned by brushing until they showed no visible plaque after staining. At the end of each period plaque was stained and the dentures were photographed. The photographs were projected, and the percentage area of the fitting surface showing plaque deposits was scored with 10% intervals. Statistical analysis showed that there was a significant reduction of plaque scores with increasing enzyme concentration. The most marked reduction in plaque formation was seen when mechanical cleansing was combined with immersion in a 500-mg enzyme solution. At a concentration of 300 mg (or more) the enzyme immersion was as efficient as mechanical cleansing in preventing denture plaque accumulation.

Dental Plaque↗
PubMed2004

A subjective study of dimensional stability of permanent acrylic resin complete denture bases after a second curing cycle.

The aim of this study was to subjectively assess permanent denture base retention and stability in order to determine whether detrimental change occurred as a result of a second curing cycle. 100 complete upper denture bases were assessed by clinician and patient using visual analogue scales at try-in and insert. No statistically significant alteration in mean scores for retention and stability was seen. 5% of bases showed some deterioration, but none required rebasing or remaking as a result. The advantages of permanent bases during denture construction seem to outweigh the risk of loss of retention and/or stability as a result of distortion due to the second curing cycle.

Acrylic Resins↗
PubMed1992

[Saliva and dentures].

Saliva plays an important role in the functioning of full dentures. A prosthesis does not rest on bare mucous membranes but on an interposed salivary film. This pellicle, mainly consisting of mucin glycoproteins, protects the tissues from injury caused by the denture base. The retention of the complete upper denture, and in a lesser degree of the lower, is also dependent on the salivary layer between the denture base and the oral tissues. A combination of several physical factors results in an adhesion. In order to achieve an optimal effect of these adhesive forces, the manufacturing of the dentures as well as the long term aftercare should meet a number of requirements, described in this article.

Denture Design↗
PubMed1995

Relationships between facial morphology and activity of orofacial muscles in patients with a complete upper and a partial lower denture.

In a sample of 30 partially edentulous subjects, provided with an immediate complete upper denture and a partial lower denture and followed for 2 years, a correlation analysis was performed between facial morphology, as measured by lateral head films, and EMG peak mean voltages of the anterior temporal and masseter muscles when clenched and during swallowing and chewing, and of the lip muscles during swallowing. At the pre-treatment stage, when the patients occluded on a residual anterior dentition, correlations between facial morphologic characteristics and peak mean voltages of the jaw closing muscles indicated stronger muscle activity in individuals with a square facial type. No significant associations were observed between muscle activity and the age of the subjects, which ranged from 36 to 71 years. After placement and use of the dentures a significant forward-upward rotation of the mandible with a decrease in overbite occurred, as a result of resorption of the edentulous maxillary ridge. At the 1 year stage of denture use, the elevator activity showed no significant correlations with facial morphology. On the other hand, negative correlations were observed especially between the anterior temporal activity and anterior overbite. Similar negative correlations were observed for the lip activity during swallowing, especially of the upper lip. These findings suggest occlusal contact between the incisors during the various functions in subjects with a small overbite. The findings further suggest that the anterior temporal and the upper lip muscles are sensitive to changes in anterior occlusal relations of the dentures.

Adult↗
PubMed1989

Wear mechanisms of resin and porcelain denture teeth.

The aim of this investigation was to describe the wear mechanism in occlusal contact areas of porcelain and acrylic resin denture teeth opposing different dental materials. A 55-year-old man with earlier extensive wear was given two complete dentures, as identical as possible, in the upper jaw. One of the dentures had diatoric teeth in cross-linked resin and the other denture had diatoric teeth in porcelain. The dentures were antagonizing a new gold-acrylic fixed bridge from 46 to 36. Two contralateral segments of the bridge were made as removable double crowns. The removable segments were made in different materials: gold, porcelain, light-cured resin, and heat-cured resin. Wear of the denture teeth was studied by scanning electron microscopy on replica models made after 1 and 2 months of antagonizing contact with the various materials. Wear of both porcelain and modern cross-linked resin teeth was mainly a fatigue type of wear. Abrasion was observed when hard particles were assumed to be part of the wear debris.

Dental Porcelain↗
PubMed2005

Oral candidosis, denture cleanliness and hygiene habits in an elderly population.

BACKGROUND AND AIMS: Poor denture hygiene and Candida infections are very common among elderly denture wearers. Candida species are usually innocuous, but they can cause disease when conditions are favorable. Oral hygiene habits have been found to be poor among the elderly. This may be due to decreasing manual abilities due to advanced age. Dentures act as a reservoir for yeasts, and this may be aggravated by poorly fitting and old dentures. The purpose of this study was to determine oral hygiene habits, denture cleanliness and presence of yeasts in elderly complete denture wearers. METHODS: 42 subjects who had worn complete upper dentures for at least six months were surveyed. The mean age of the subjects was 74 years. Information about denture age, denture hygiene and hygiene habits of subjects was obtained through a structured interview. Clinical examination was conducted by one author. Denture cleanliness was assessed by using the Schubert and Schubert index. For cytological examination, palatal swabs were taken. A chi-square test was used to analyze the results. RESULTS: A significant correlation was seen between oral candidosis and frequency of denture cleaning, and also between candidosis and denture cleanliness. There was no statistically significant correlation between denture cleaning methods and candidosis. The relationship between denture age and the presence of Candida was not significant. There was a significant correlation between denture cleanliness and denture age, cleaning method or frequency of cleaning. CONCLUSIONS: Only 16.7% of dentures worn by the elderly are properly cleaned. Older dentures tended to be dirtier than newer ones. There was a significant correlation between poor denture hygiene and prevalence of Candida.

Aged↗
PubMed1990

A 5-year longitudinal study of cantilevered fixed partial dentures compared with removable partial dentures in a geriatric population.

Prosthesis function and dental conditions were observed for 5 years in 27 elderly patients treated with mandibular cantilevered fixed partial dentures (FPDs) and in 26 elderly patients treated with distal-extension removal partial dentures (RPDs). All patients were treated with a complete upper denture. The patients were assigned randomly into two treatment groups that had the same composition with regard to sex, age, and distribution of teeth. The patients were under supervised oral hygiene and prosthodontic care. Clinical examination of prostheses, masticatory system, periodontal status, and caries was carried out yearly. Oral hygiene was good, and the periodontal status was maintained in both groups. Caries was observed six times more frequently in the RPD group than in the group with fixed restorations, however. Occlusal and functional conditions deteriorated in the RPD group only. Eight of 42 fixed partial dentures (19%) failed; of these, six were recemented with composite resin. Generally the need for dental and prosthetic follow-up treatment was more pronounced in the RPD group than in the FPD group.

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↗
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↗