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At least 55 records · Page 3Linked to original sources
PubMed1979

The Langerhans cell density of palatal epithelium in denture and non-denture wearers, as correlated with other parameters of the palatal mucosa.

A quantitative histological investigation was carried out on biopsy specimens taken from patients suffering from denture sore mouth. The results were compared with those obtained in 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, normal denture wearers and the patients suffering from denture sore mouth did not show changes in mean thickness of the epithelium as 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 number of Langerhans cells correlated with the mitotic indices of the group of denture wearers and non-denture wearers. The group of denture sore mouth patients showing a low mitotic index showed a high number of Langerhans cells in their palatal epithelium. The three groups of patients investigated did not show differences in density of mast cells in the lamina propria of their palatal epithelium.

Adult↗
PubMedDate not supplied

Occlusal contacts of edentulous patients with mandibular hybrid dentures opposing maxillary complete dentures.

The purpose of this study was to evaluate differences between the occlusal contacts of edentulous patients with mandibular implant-supported hybrid dentures opposing maxillary complete dentures and those of patients with conventional maxillary and mandibular complete dentures. Six parameters related to occlusion were measured in the 2 groups (n = 40 for each group) using pressure-sensitive film. The mean values generated by each test group for each parameter were compared using a t test. Pearson's correlation coefficients between occlusal force, age, and time in function were examined. Occlusal force and area in the implant denture wearers were larger than those in the conventional denture wearers. No significant difference was seen in occlusal force balance between the left and right sides. The center of occlusal load in the implant denture wearers was more anterior. The maxillary denture may become more unstable in implant denture wearers. It is suggested that the stability and retention of a maxillary denture be checked and the occlusion be adjusted more frequently in the hybrid denture wearer than in the conventional denture wearer.

Adult↗
PubMed2000

[Epidemiologic study of modality and state of preservation of dentures and the possible presence of mucosa lesions in subjects with removable dentures].

BACKGROUND: The replacement of lost teeth by fixed or removable dentures is very important in order to re-establish a correct phonetic and masticatory function and to restore a good aesthetical appearance to the patient. However when dental prosthesis, particularly the removable ones, become inadequate they may be responsible for a series of more or less dangerous lesions of the oral tissues. In this work a clinical and epidemiological study regarding the modality and the state of preservation of dentures in time has been carried out; moreover the possible presence of mucous membrane lesions in subjects with removable dentures has been investigated. METHODS: Seventy-height subjects with partial or totally removable dentures have been examined. After a general and stomatological anamnesis a thorough objective examination of the oral cavity was carried out in order to evaluate the removable denture state and the possible presence of mucous lesions correlated to them. RESULTS: Women from sixty to seventy represent the greatest part of the subjects with removable dentures examined in this study. Nine years is the medium range of removable denture permanence in the mouth; in the greatest part of acrylic dentures the resin has never been replaced, they are inadequate and show a poor state of preservation. Twenty-height percent of the subjects examined report different troubles and in 46% of the cases the presence of dentures causes mucous lesions. CONCLUSIONS: Since the greatest part of removable dentures examined in this study are inadequate and badly preserved, patients with removable dentures had better check them more often in order to allow the dentist to evaluate the functionality and the care of the dentures and to discover in time the possible presence of mucous lesions.

Adult↗
PubMed1990

[Experimental study on the plastic deformation of underlying mucosa in lower posterior denture caused by occlusal stress after denture wearing].

In the treatment of removable dentures including mucosa born, it is essential to secure the occlusion based on adequate consideration of deformation of mucous membrane. This means that it is necessary to clarify the plastic deformation of underlying soft tissues after denture insertion. With the objective of assessing the influence of the difference in the supporting pressure of the underlying soft tissues, the longitudinal changes of the tissue surface after insertion of denture were observed. The non-pressure areas with special conditions were established between the basal surface of the dentures and the surface of the underlying soft tissues. Removable free end dentures with cylindrical non-pressure cavity (3 mm in diameter and 2 mm in depth) in the basal surface were prepared for 20 subjects having a missing of lower posterior region. Such three non-pressure cavities were positioned in the following locations: in a mesio-distal location corresponding to the distal region of the first molar, at the alveolar crest, at a location halfway between the alveolar crest and the buccal denture border, and a location halfway between the alveolar crest and the lingual denture border. Impressions were taken from the subjects' jaws after the fixed numbers of days following initiation of denture wearing. Contours of the non-pressure areas were measured in 100 jaw models. Results. 1. Swelling of the mucous membrane of the non-pressure area 1) Subjects are classified into the following 5 types on the bases of longitudinal changes in the swelling height of the mucous membrane in the non-pressure area. Type S-1: Marked increase in swelling height observed within the first 3 days after insertion of dentures, but practically no change in swelling height until the 30th post installation day. Type S-2: Marked increase in swelling height observed within the first 3 days after insertion of dentures, and swelling height increased continuously until the 30th post installation day. Type S-3: Marked increase in swelling height observed within the first 3 days after insertion of dentures, but swelling height decreased continuously until the 30th post-installation day. Type G: Increase in swelling height comparatively small within the first 3 days after insertion of dentures, but swelling height increased until the 30th post-installation day. Type N: No increase in swelling height observed until the 30th post-installation day. 2) Swelling height and frequency in each location according to type.(ABSTRACT TRUNCATED AT 400 WORDS)

Adult↗
PubMed1996

Effects of improvements of poorly fitting dentures and new dentures on masseter activity during chewing.

The effects of four sequential modifications to improve occlusion, vertical dimension, retention, and stability of poorly fitting dentures, and of placing new dentures, on the EMG activity were investigated in 21 denture wearers with a mean age of 67.7 years. Electromyographic recordings of right and left masseter muscles were made while the subjects performed masticatory and swallowing threshold tests and applied static guided forces were measured before and after each modification and at three intervals after the delivery of new dentures. A 2-week adaptation period was allowed for each denture modification. Three- and 12-week adaptation periods were allowed for the new dentures. No significant changes were found in guided static bite force or peak bite force during chewing following any modification or insertion of new dentures. Significant decreases (p < 0.05) from the original poorly fitting denture in preferred side and nonpreferred side muscle activity were found for the preferred side tests with both foods after both the correction of occlusion and 3 mm increase in vertical dimension. Concomitant decreases (p < 0.05) in the masseter closing burst and stroke durations were found and contributed to the reduction in masseter muscle effort. Further reductions (p < 0.01) in masseter closing bursts and stroke durations were observed with new dentures. The results revealed that new dentures or the stabilization of poorly fitting dentures through occlusal correction and restoration of occlusal vertical dimension permits patients to use less muscle effort while chewing and maintaining their initial masticatory performance.

Adaptation, Physiological↗
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

[Study on the number of denture adjustments in complete denture wearers--relationship to mandibular ridge shape].

PURPOSE: This study investigated the relationship between the degree of mandibular alveolar ridge resorption and the number of denture adjustments after insertion of dentures in complete denture wearers. METHODS: The subjects were 77 complete denture patients (34 males, 43 females, mean age 69.1+/-8.1 years). Using bite plates of Gothic arch tracing for new denture production, the width, height, and inclination toward the tentative occlusal plane of the mandibular alveolar ridge corresponding to the canine areas (C), first premolar areas (P1), second premolar areas (P2), and first molar areas (M1) were measured bilaterally, and the relationship with the number of denture adjustment was evaluated. RESULTS: The mean of number of denture adjustments was 4.4+/-1.8 times (male 3.8 times, female 5.0 times), showing a significant difference between males and females (p<0.01). The alveolar ridge mean width was C: 9.7 mm, P1: 10.4 mm, P2: 11.5 mm, and M1: 13.0 mm respectively. The alveolar ridge mean height was C: 4.3 mm, P1: 4.6 mm, P2: 4.9 mm, and M1: 5.2 mm. The alveolar ridge mean inclination was C: 11.2 degrees, P1: 13.5 degrees, P2: 15.4 degrees, and M1: 18.8 degrees. The width and height of the mandibular alveolar ridge in C, P1, P2, and M1 were significantly larger in males than in females (p<0.05). The height of mandibular alveolar ridge was significantly lower in high number of denture adjustment than in low number of denture adjustment (p<0.05). CONCLUSION: Complete denture wearers showed a high relation between the number of denture adjustment and the mandibular alveolar ridge height.

Adult↗
PubMed1977

Prevention of denture plaque formation by an enzyme denture cleanser.

It was the purpose of the study to test the efficacy of dissolvent tablets containing mutanase and protease in preventing formation of plaque on the fitting surface of complete dentures. The study group consisted of 60 denture wearers with denture stomatitis who were assigned randomly into an enzyme group, a placebo group, or a Steradent group. After denture treatment was completed the patients were instructed to immerse the new dentures for 15 min once daily for one month in the denture cleanser. The amount of denture plaque, the clinical condition of the palatal mucosa, and the concentration of yeasts in mucosal and denture smears were recorded while the patients used their original dentures and after the experimental period. The study was designed and carried out as a double-blind study. New denture plaque had formed in all patients; however in the enzyme group significantly reduced plaque scores were recorded as compared with the plaque scores recorded on the original dentures. The Steradent tablets or the placebo tablets had no apparent effect.

Bacteria↗
PubMed2001

[Comparative study on self-made denture adhesive paste and fixodent in improving chewing efficiency of dentures].

OBJECTIVE: The objective of this study is to test whether the self-made denture adhesive paste can improve the chewing efficiency of complete denture. METHODS: The abilities to improve chewing efficiency of two different materials, including self-made and Fixodent denture adhesive paste, will be investigated in this experiment. 24 patients were randomly selected, who wore complete dentures or mucous membrane supporting removable partial dentures because of the loss of most teeth. Identical test method was adopted by chewing peanuts. By employing a spectrophotometer, the absorbency values of chewed peanuts suspension before and after the use of self-made denture adhesive pasties were measured, and the differences could be obtained by calculation. The differences indicated the relationship between denture adhesive paste and chewing efficiency. Then the results of two materials would be compared and analyzed. RESULTS: The statistical analysis revealed that both self-made denture adhesive paste and Fixodent resulted in remarkable difference in the absorbency values before and after use (P < 0.01), however, there is no obvious difference in improving the chewing efficiency between the self-made and Fixodent denture adhesives (P > 0.05). CONCLUSION: The self-made denture adhesive paste is the same as Fixodent in improving the chewing efficiency of denture.

Dental Bonding↗
PubMed1980

Effect of a denture adhesive on complete denture dislodgement during mastication.

A method of evaluating the denture stabilizing effects of a denture adhesive by means of counting denture dislodgements during the eating of a standardized portion of a test food is described. A reduction in the number of such dislodgements after application of a denture adhesive, as compared to eating the same food without adhesive applied to the denture, was used as a measure of adhesive effectiveness. Subject responses to a number of denture-performance satisfaction parameters were also obtained. With a test adhesive, significant reductions in dislodgement were found using steak, taffy-apple, a hard-roll sandwich, and celery as test foods among 16 subjects with dentures that fit well. Analysis of subjective evaluations indicated that the test adhesive was perceived as having effected: (1) improved chewing ability, (2) reduced denture wobble, (3) improved confidence, (4) increased comfort, and (5) reduced amount of food particles collecting under the denture, all to a significant degree (p < .01). It is suggested that additional data from controlled clinical studies are needed to allow proper assessment of the usefulness and possible abuse effects of denture adhesive products. This method, and the resulting data, are offered as a stimulus to the end.

Adhesives↗
PubMed2002

Tensile bond strength of acrylic resin denture teeth to a microwave- or heat-processed denture base.

STATEMENT OF PROBLEM: Fracture of acrylic resin prosthetic teeth from acrylic resin denture bases can be a problem for some patients. The optimal combination of acrylic resin denture tooth, denture base material, and processing method is not known. Purpose. The objective of this study was to compare the tensile bond strengths of heat- and microwave-polymerized acrylic resins among 4 types of acrylic resin denture teeth. MATERIAL AND METHODS: Heat-polymerized (Lucitone 199) and microwave-polymerized (Acron MC) acrylic resins were used. Four types of acrylic resin denture teeth (IPN, SLM, Vitapan, and SR-Orthotyp-PE) were milled to a fixed diameter according to ADA specification no. 15. Ten specimens of each tooth type were processed to each of the denture base materials according to the manufacturers' instructions. Ten additional resin control specimens without teeth also were fabricated. Specimens were thermocycled and tested for strength until fracture with a custom alignment device. Data were analyzed with analysis of variance and Duncan's multiple range test. A scanning electron microscope was used to identify adhesive and cohesive failures within debonded specimens. RESULTS: The mean force required to fracture the specimens ranged from 5.3 +/- 3.01 to 21.6 +/- 5.2 MPa for the microwave-polymerized base and 11.2 +/- 3.0 to 39.1 +/- 5.1 MPa for the heat-polymerized base. The most common failure was cohesive within the denture tooth. With each base material, Orthotyp and IPN teeth exhibited the highest bond strengths; SLM and Orthotyp bond strengths were similar. In general, heat-polymerized groups failed cohesively within the denture base resin or the tooth, and microwave-polymerized groups failed adhesively at either the ridge lap or occlusal surface of the denture tooth. CONCLUSION: Within the limitations of this study, the results suggest that the type of denture base material and denture tooth selected for use may influence the tensile bond strength of the tooth to the base. Selection of more compatible combinations of base and resin teeth may reduce the number of prosthesis fractures and resultant repairs.

Acrylic Resins↗