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At least 19 recordsLinked to original sources
PubMed1975

Histological features of the palatal mucosa in denture sore mouth. Densities of mast cells in the lamina propria and histological features in the epithelium of the denture bearing and non-denture bearing human palatal mucosa in comparison with patients suffering from denture sore mouth.

A histological investigation was carried out on biopsy specimens taken from patients suffering from denture sore mouth. The results were compared with those obtained in previous investigations on denture and non-denture-wearers. The sections were studied by standardized quantitative morphometric methods. After 4 years the denture bearing palatal epithelium from both groups, the denture wearers and the patients suffering from a denture sore mouth did not show changes in mean thickness of the epithelium from both groups, the denture wearers and the patients suffering from a denture sore mouth did not show changes in mean thickness of the epithelium compared with the controls. The mitotic index in denture bearing epithelium from patients suffering from denture sore mouth was three times lower than in the epithelium of the normal denture wearers. The three groups of patients investigated did not show differences in density of mast cells in the lamina propria of their palatal epithelium.

Adult↗
PubMed1980

Location of the allergenic monomer in warm-polymerized acrylic dentures. Part I: Causes of denture sore mouth, incidence of allergy, different allergens and test methods on suspicion of allergy to denture material - a survey of the literature. Case report, allergenic analysis of denture and test casting.

In the literature dealing with causes of denture sore mouth (D.S.M.) a review is given of some possible allergenic factors in acrylic dentures and of testing procedures, as well as of the incidence of allergy. A report is presented of a patient with D.S.M., the cause of which was allergy to the denture material. Skin tests showed that the surface of the upper denture in contact with the hard palate was allergenic, but not the vestibular surface in contact with the cheeks. The lingual surfaces of the lower denture were not allergenic (the other surfaces were not investigated at this sitting). It could not be ruled out that the resin might be inhomogeneous as regards the allergenic factor. The allergenic properties were verified with test castings in the form of discs made under similar conditions to those for the palatal surface. A test casting made in the same way as the vestibular side of the upper denture showed allergenic properties before polishing. The absence of allergenic properties at this point of the denture could be explained by means of another experiment with a test casting in which the allergenic properties disappeared after polishing of the surface of the resin. The working theory was set up that both the palatal and vestibular surfaces of the denture are allergenic, but that this is eliminated by polishing of the latter. The theory was tested in Part III. It was ruled out that the impression material and insulating material could be allergenic. This study is continued in Parts II and III.

Acrylic Resins↗
PubMed1990

[Clinical survey on denture stomatitis. 2. The relation between the maintenance of denture and denture stomatitis].

A previous study suggested that denture plaque played an etiologic role in denture stomatitis. In daily practice, it is important to instruct denture wearers about denture plaque control. In this study, the major areas of investigation were the degree of denture stomatitis and denture plaque, denture hygiene habits, wearing habits and age of present denture. 643 patients wearing dentures (1981-1988) were selected, from 47 to 91 years old. The following results were obtained. 1. About 50 percent of the 643 patients used brush for cleaning their dentures. The number of people wearing dentures during sleep was fewer than those who preferred removal of dentures during sleep. 2. Soaking dentures in denture cleanser reduced the degree of denture stomatitis and denture plaque. 3. The patients wearing dentures during sleep showed much more occurrence of denture stomatitis than those who had not that habit. 4. Denture stomatitis occurred frequently with increasing the age of the present denture. The present results indicate that the occurrence of denture stomatitis is closely related to the quality of the maintenance of denture.

Aged↗
PubMed1989

[Clinical survey on denture stomatitis. 1. Relation between denture plaque and denture stomatitis].

Denture stomatitis is a very frequent complication of the denture wearers. In this study, the relation between denture plaque and denture stomatitis was evaluated by a simplified culture (STOMASTAT). 583 patients wearing dentures (1981-1987) were selected, from 47 to 91 years old. The following results were obtained. 1. Degree of denture plaque in 583 patients was severe, moderate, and no detection: 30, 35 and 35%, respectively. 2. Grade of denture stomatitis in 583 patients was severe, moderate, and no symptom: 24, 36 and 40%, respectively. In this survey, the occurrence of denture stomatitis was about 60%. 3. The good correlation between degree of denture plaque and grade of denture stomatitis was recognized in this study. The present results suggest that denture plaque plays an etiologic role in denture stomatitis and, in daily practice, it is important to instruct denture plaque control for denture wearers.

Aged↗
PubMed2002

Effects of a denture adhesive on masticatory functions for complete denture wearers--consideration for the condition of denture-bearing tissues--.

The purpose of this study was to examine effects of a denture adhesive on masticatory functions for complete denture wearers considering the condition of denture-bearing tissues. Sixteen edentulous subjects wearing well-fitting complete dentures volunteered to participate in this study. According to the condition of denture-bearing tissues, subjects were divided into two groups; "good group" and "poor group". Maximum biting forces, masticatory performance, and electromyography of the masseter muscle during mastication were recorded with and without a denture adhesive. Durations of chewing burst and cycle, and coefficients of variation for these variables were calculated using electromyography recordings. Data were analyzed by using two-way repeated-measured ANOVA and paired t-test in order to assess the effect of the use of a denture adhesive. The use of the denture adhesive increased maximum biting force and provided rhythmic masseter muscle activity during mastication for both groups. Masticatory performance was improved and duration of chewing burst was decreased only for "poor group". It was concluded that the effects of the denture adhesive on masticatory functions were observed overall for both groups, and more significant for denture wearers with poor denture-bearing tissues than with good denture-bearing tissues.

Adhesives↗
PubMed1989

On the clinical deformation of maxillary complete dentures. Influence of denture-base design and shape of denture-bearing tissue.

This paper aimed to study the influence of denture base design and the shape of the denture-supporting area on the functional deformation of maxillary complete dentures. Six strain-gauged duplicate maxillary dentures were made for the study of two test subjects with different shapes of the palatal vault. Each subject was supplied with two polymethyl methacrylate dentures, one with a 1-mm-thick palatal base and the other 2 mm thick. A third denture was constructed with a cobalt-chromium base. The functional loading tests included maximum biting and the chewing of the food test samples. An analysis based on chewing time and total number of chewing cycles per test piece was also made. The results showed that surface straining is highly complex at the anterior part of the maxillary dentures constructed from polymethyl methacrylate and that increasing the denture thickness per se might not be accompanied by a reduction of strain. The results also suggest that high thrust to the supporting tissue is produced with high palatal vault dentures made in polymethyl methacrylate. The study proposes that cobalt-chromium bases may be used in maxillary dentures to reduce functional deformation and thrust to the supporting tissues at the anterior part of the maxilla.

Aged↗
PubMedDate not supplied

Changes in the masticatory function of complete denture wearers after relining the mandibular denture with a soft denture liner.

PURPOSE: The purpose of this study was to examine changes in the masticatory function of complete denture wearers after relining the mandibular denture with a soft liner. MATERIALS AND METHODS: Conventional complete dentures were fabricated for 6 completely edentulous patients. One month after completing adjustments of the dentures, maximum biting force, masticatory performance, and electromyography of the masseter muscle during mastication were recorded. Chewing strokes, chewing time, muscular activity, and masticatory rhythm were calculated using the recorded electromyography. The mandibular dentures were then relined with a soft liner. One month after finishing adjustments of the relined dentures, the same tests were performed. These values were compared using a paired t test (alpha = 0.05). RESULTS: When using the soft liner, masticatory performance and maximum biting force were significantly greater (P = 0.019 and P = 0.023, respectively). In addition, the number of chewing strokes was significantly lower (P = 0.020), and chewing time was reduced (P = 0.010). A more stable masticatory rhythm was also found in the initial chewing stage. The muscular activity tended to decrease after the insertion of the lined denture, but no significant difference was found between before and after relining. CONCLUSION: It was shown that applying a soft lining material to the mandibular dentures of 6 edentulous patients improved masticatory function with no adverse effect on the muscular task.

Acrylic Resins↗
PubMedDate not supplied

Bonding durability of conventional resinous denture teeth and highly crosslinked denture teeth to a pour-type denture base resin.

PURPOSE: The study examined the bond strength between 2 types of resin denture teeth and a pour-type denture base resin after thermocycling. The denture teeth were untreated, prepared with diatorics, or treated with a solvent, dichloromethane. MATERIALS AND METHODS: Conventional denture teeth and crosslinked denture teeth were bonded to a pour-type denture base resin. Compressive load was applied at 45 degrees on the palatal surface of each tooth until fracture. The teeth were either thermocycled or not thermocycled. Porcelain teeth were also tested for comparison. RESULTS: There was no significant difference in bond strength between the conventional resin teeth and the crosslinked denture teeth. Thermocycling significantly decreased the bond strength of the 2 types of resin teeth but had no effect on porcelain teeth. The application of dichloromethane significantly improved the bond strength of the 2 types of resin teeth either before or after thermocycling. CONCLUSION: It is recommended that dichloromethane be applied on the denture teeth ridge-lap area prior to denture base processing.

Analysis of Variance↗
PubMed1989

[Solvent power of new denture cleaner for denture calculus and the influence of this cleaner on the denture materials].

In order to chemically remove the calculus adhering to a denture, new denture cleaner was prepared on an experimental basis. The principal ingredient of this solution was a chilating agent which contained the phosphoric acid. This study consisted of the fundamental and the clinical examinations of this solution the purpose of which was to test the solvent power of this solution on the calculus and to evaluate its influence on the denture materials and its effectiveness in clinical practice. 1. the fundamental study 1) method (1) The test for the solvent power of this solution. The powder of tricalcium phosphate (T.C.P. powder: Wakohjunyaku Co.) was substituted for the calculus adhering to a denture. (1) The influence of the solution temperature on the solvent power. The T.C.P. powder was dissolved at 20 degrees C, 30 degrees C, 40 degrees C, 50 degrees C and 60 degrees C temperature in 10 g of the solution within 10 minutes and the amount of dissolved powder was weighted. The time was measured with a stop watch (Seiko Co.) until 0.5 g of T.C.P. powder had been dissolved in 10 g of the solution. (2) The effect of using it with an ultrasonic cleaner. The time to dissolve 0.1 g of T.C.P. powder in 10 g of this solution was compared with that of the 15% EDTA solution. The measurement was repeated 5 times and the arithmetic mean of the 5 sample values was calculated in order to show the experimental results. The room temperature was 19 +/- 2 degrees C, the humidity was 56 +/- 3%. (2) The influence of this solution on the denture materials. (1) resin specimen. In order to test the transverse strength, transverse deflection, Young's modulus and Knoop hardness, resin specimens were processed in the manner specified in I.S.O. 1567. The data were compared the resin specimens steeped in this solution and with the control sample that was steeped in water. The specimens were immersed up to 24 hours. Furthermore the existence of tarnish was observed with a 40 times microscope. (2) metal specimen. In order to test the corrosion, metal specimens were produced according to the manner of a corrosion test. The metal specimens were held vertically and the end immersed to 20 mm in this solution for 24 hours and 120 hours each. After steeping, each specimen was measured for loss in weight. The data were calculated as the loss in weight per hour (mg/cm) and the depth of corrosion per year (mm/yr).(ABSTRACT TRUNCATED AT 400 WORDS)

Corrosion↗
PubMed1985

Custom-made denture teeth and denture base material for removable partial dentures.

A method that uses Isosit material to fabricate custom-made denture teeth and denture base has been described. The advantages of this technique are the denture teeth can be made to function in harmony with dynamics of the stomatognathic system; any type of occlusal scheme can be used; the material is esthetically pleasing; it can be characterized; it can be used as a denture base material, which can also be characterized; it can be repaired, relined, or rebased with little difficulty; and laboratory procedures can be accomplished in the dental office or laboratory.

Acrylic Resins↗
PubMed1991

Basic studies on visible light-curing resin for denture base. Part 8. The hardening depth of denture relining material after penetration of light through the denture base resin.

A study was performed to examine how the duration of irradiation at the time of relining with visible light-curing material influences the depth of hardening of the relining material, in relation to the thickness of the denture base placed between the denture and the relining material. It was found that for a range of denture base thickness of 1-2.5 mm, a desirable degree of hardening could be obtained using an irradiation time of 20 s for relining material with a thickness of up to 4 mm used for the basal surface.

Dental Materials↗
PubMed1994

Perceptions of denture aesthetics: a two-centre study of denture wearers and denture providers.

A study into perceptions of complete dentures was carried out in two dental schools, one in Australia and the other in England. Two-hundred participants were asked to assess photographs of five sets of dentures for age, gender and personality. Results were subjected to a multi-rater kappa statistic. Although no centre was determined to be better than the other, it was highly significant that Australian teachers were confident enough to state that they were unable to determine age or gender from the information supplied.

Adult↗
PubMed2002

Control of denture plaque and mucosal inflammation in denture wearers.

The aims of this study were to collect data about the popular methods and materials used for cleaning dentures among complete and partial denture wearers in Jordan and to discuss the relationship between denture base plaque and mucosal inflammation under dentures. A questionnaire consisting of six questions regarding denture hygiene practices and cleaning products was completed by 321 patients who attended two prosthodontic clinics for replacement or adjustment of their dentures. Following careful oral examination and examination of dentures, the relationship between denture hygiene and inflammation under the denture base was investigated. In this study there were 615 dentures and 321 patients. The mean age of patients was 65 years and it ranged from 18 to 100 years (s.d. = 10.1). The mean age of their dentures was 7.3 years (s.d. = 5.6) ranging from one to 27 years. The most popular method of cleaning dentures was brushing. Ninety-four (29 per cent) of the denture wearers had denture stomatitis. There was a statistically significant relationship between poor denture hygiene and denture stomatitis (P = 0.0001). There was also a significant relationship between continuous wearing of the dentures, day and night, and denture stomatitis (P < 0.0001). The presence of bacterial and yeast plaque on the fitting surface of the denture base appeared to be of critical importance for development and maintenance of denture stomatitis. It is necessary, therefore, that dentists should give instructions to denture wearers on how to clean their denture surfaces properly so as to maintain good hygiene and prevent denture stomatitis.

Acrylic Resins↗
PubMed2003

Effect of denture adhesive on stability of complete dentures and the masticatory function.

This study examines the effects of denture adhesive on the retention and stability of complete dentures and the masticatory function. The authors estimated the stability of complete dentures from 3-dimensional (3-D) denture movement and rotational denture movement and additionally the masticatory function from cycle time and chewing time. Six edentulous subjects who participated in this study had old and newly fabricated complete dentures. Upper denture movement was recorded using a 3-D motion capture system while chewing 3 kinds of food (peanuts, fish paste, raisins). Both the new and old dentures showed that using a denture adhesive contributes to reducing 3-D denture movement, rotational denture movement and chewing time during chewing the various foods. The cycle time in new and old dentures was statistically unaffected by applying denture adhesive. There was no statistically significant difference in improvement in 3-D denture movement or rotational denture movement between the new and old dentures, for any of the foods. This study observes the overall effect of denture adhesive during use for both dentures. The results of this study suggest that denture adhesive contributes to reducing denture movement and so improves chewing function.

Adhesives↗
PubMedDate not supplied

Correlation between patient satisfaction with complete dentures and denture quality, oral condition, and flow rate of submandibular/sublingual salivary glands.

PURPOSE: The purpose of this study was to examine the correlation between patient satisfaction with complete dentures and parameters of denture quality, oral condition, and flow rate of the submandibular and sublingual salivary glands. MATERIALS AND METHODS: The parameters were evaluated on 50 denture wearers using semiquantitative scales and a recently described submandibular/sublingual saliva collector. RESULTS: Most patients had a medication-induced reduced salivary flow rate (mean 0.024 mL/min/gland; SD 0.040). Submandibular/sublingual salivary flow rate correlated statistically with six denture satisfaction parameters: maxillary denture retention and comfort, mandibular denture retention and comfort, abilities of chewing, and speech. Residual alveolar ridge resilience, maxillary ridge shape, and denture quality did not significantly correlate with denture satisfaction. Characteristics of musculature correlated significantly only with subjective maxillary denture retention, and mandibular ridge shape correlated with comfort. CONCLUSION: Submandibular/sublingual salivary flow rate is an important factor in denture satisfaction. The retention of the maxillary denture was correlated to the oral musculature characteristics, and the mandibular denture comfort was correlated to the mandibular ridge shape. Denture satisfaction was not affected by other anatomic or denture quality-related parameters.

Aged↗
PubMed2004

The attitude of complete denture wearers towards denture adhesives in Istanbul.

The purpose of using denture adhesives is to subjectively benefit denture-wearers with improved fit and comfort of their dentures and to improve their chewing ability and confidence. The purpose of this study was to investigate the approach and thought of complete denture wearers to denture adhesives and to see why they had tried denture adhesive, and their reasons for its current use or non-use through a questionnaire. One hundred and fifteen patients attending the Marmara University, Dental School for new denture treatment were surveyed. In the survey, there were 62 females (54%) and 53 males (46%). Nearly half of these patients (53%) were in the 61-70-year age group with a mean age of 64 years. One hundred and six (92%) patients had never tried denture adhesive. Most patients (73%) who did not use denture adhesives managed their dentures well, but a significant number 101 (87%) did not know that denture adhesives existed. Nine (8%) had tried denture adhesives, and none of the patients were currently using them. Those who ceased using denture adhesive complained mainly that it did not improve the fit and chewing ability significantly. The outcome of this survey demonstrated that the knowledge of the patients is not enough on denture adhesives in Istanbul as it is still generally believed by the practitioners that the prescription of a denture adhesive is a sign of failure of the dentist.

Adhesives↗