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PubMed1983

Denture mobility and bolus position during mastication in patients wearing conventional and pelotte-retained full upper dentures: a cineradiographic study.

With cineradiographic technique an assessment was made of the denture mobility of conventional and pelotte dentures in the upper jaw and of the position of the bolus during chewing of meat and bread. Five randomly selected edentulous patients with moderate alveolar ridge resorption rehabilitated with dentures of conventional design, and another five with dentures furnished with subnasal retentive pelottes, were incorporated in the study. Cineradiographic registrations were made in lateral and frontal projections with a picture frame speed of 38/s. Analysis of the cineradiographic films revealed only small differences for the denture mobility for the two patient groups. This indicated in the patients with severe ridge resorption, an obvious reduction of denture displacement through the use of the nasal pelotte or prong. The displacement was of similar magnitude as for those dentures where an alveolar ridge creates effective retention and limitation of horizontal movements. The analyses of the bolus position during chewing gave the information that in all individuals wearing pelotte dentures, the bolus was positioned more distally, than for patients with conventional dentures. Presumably this was in order to reduce discomfort in the frontal region, i.e. the region of the pelottes. Patients with conventional dentures showed a more even distribution of the bolus to all regions.

Aged↗
PubMed1989

[Dynamics of atmospheric pressure under the maxillary complete denture. 1. Relations between the denture retention and the atmospheric pressure].

Dynamics of atmospheric pressure under the maxillary complete denture, and their relations with the denture retention influenced by the factors such as the denture seating force, the saliva viscosity and the postdamming, were investigated on the simulation models. The following results were obtained. 1. The atmospheric pressure under the denture became higher than the external one by the denture insertion, and increased during the denture seating, and decreased by the removing force of denture and furthermore became lower than external one by continuous application of its force, and at all became equal to the external one when the denture separated from the basal seat. 2. Greater seating force brought about greater positive pressure and less negative pressure. 3. Higher viscosity of saliva and the postdamming brought about greater positive and negative pressures. 4. Both of greater seating force and higher viscosity of saliva brought about greater retentive force. 5. The postdamming was useful for the maxillary posterior border seal. 6. The atmospheric pressure under the denture base seems not to relate directly to the maxillary denture retention in the static condition but to reveal the status of peripheral seal.

Atmospheric Pressure↗
PubMedDate not supplied

Shear bond strength of denture reline polymers to denture base polymers.

PURPOSE: This study was undertaken to characterize the shear bond strength established between four denture base polymers and four denture reline polymers. MATERIALS AND METHODS: Cylindric columns of denture reline polymers were bonded to columns of denture base polymers. Specimens were immersed in water for 4 months and then thermocycled. The strength at which the bond failed under shear stress was recorded. RESULTS: Significant differences in bond strength existed among the specimens because of the denture base polymer variable, the denture reline polymer variable, and their interaction (P < .05). A light-activated denture base polymer (Triad) bonded adequately with a light-activated reline polymer (Triad) but less well with the other reline polymers tested. The bond strength established between some denture base polymers and a different light-activated reline polymer (Rebaron LC) was relatively low. CONCLUSION: The type of denture base polymer and denture reline polymer affected the shear bond strength between them.

Acrylic Resins↗
PubMed1983

Regional variations in viable bacterial and yeast counts of 1-week-old denture plaque in denture-induced stomatitis.

Quantitative cultural studies of yeasts and bacteria were made from 1-week-old denture plaque accumulated on pieces of self-adhesive tape stuck on the fitting surface of the maxillary denture in four well-defined locations. A tape piece was also stuck on the buccal denture flange. The cultural examinations were made in 15 patients with denture-induced stomatitis which affected most of the denture-bearing mucosa. There was no significant difference of the bacterial counts from the different sampling areas although the variations between patients was significant. The yeast counts from the test area located on the buccal denture flange were significantly lower than those originating from the fitting denture surface. On the other hand, there was no significant variation of the yeast counts when comparing the test areas of the fitting denture surface. In 12/15 of the patients yeast counts of greater than or equal to 10(3)/cm2 were obtained from the fitting denture surface. The results indicate that the environmental conditions beneath a denture base predispose for yeast colonization and are different from those present on the buccal flange.

Bacteria↗
PubMed2026

Evaluating Patient Satisfaction and Oral Health Impact Profile-14 (OHIP-14): A Multicenter Crossover Study Comparing Selective Pressure Impression Conventional Dentures with Mucostatic Digital Dentures.

PURPOSE: To compare patient satisfaction and oral health impact between individuals receiving complete dentures made by digital methods and those using conventional techniques. MATERIALS AND METHODS: In this randomized crossover clinical trial, 23 patients aged 40 years and older with completely edentulous arches were enrolled at three treatment centers. Each participant received two sets of complete dentures: one set created using conventional methods (selective pressure impression) and the other through digital techniques (mucostatic digital impression). The order of denture placement was randomized, with each set used for 4 weeks. A trained specialist administered treatments alongside research tools, including a general information questionnaire, a denture satisfaction survey, and the OHIP-14 interview tool. Statistical analysis was conducted using Mann-Whitney U test. RESULTS: Participants with digital dentures reported significantly higher satisfaction regarding treatment duration, comfort, confidence, chewing ability, esthetics, and overall satisfaction compared to those with conventional dentures. There were no significant differences in satisfaction concerning speech and pronunciation. Overall, the oral health impact on quality of life was similar between denture types, but participants indicated improved quality of life while using dentures compared to being edentulous. CONCLUSIONS: Patients with digital dentures exhibited greater satisfaction across various domains compared to those with conventional dentures, despite similar satisfaction levels in speech and pronunciation. The impact on quality of life was comparable between both types, as measured by the OHIP-14.

Humans↗
PubMed1997

[The effects of soft denture liners applied to complete dentures on masticatory functions].

The soft denture liner was applied to dentures for the edentulous patients with poor residual ridge and thin mucosa. It is useful for minimizing the soreness caused by the denture during mastication, however, its effect on masticatory functions has been rarely investigated. The purpose of this study was to determine the effect of a soft liner applied to complete dentures on masticatory functions. Five edentulous volunteers who were satisfied with their new complete dentures took part in this study. The lower dentures were lined with a soft liner. Comparison of occlusal force, masticatory performance, masseter muscular activity, and mandibular movement were made between new dentures and relined dentures. The results of applying soft materials to lower dentures obtained by comparison with complete dentures using hard acrylic resin bases were follows: 1. Occlusal forces were significantly larger (p < 0.01). 2. Masticatory performance in chewing peanuts increased slightly. The number of strokes and time for masticating a peanut decreased significantly (p < 0.01). 3. Masticatory muscles functioned more rhythmically and mandibular movements became smoother. 4. Integrated EMGs per stroke of all patients was similar.

Aged↗
PubMed1979

[Studies on the thinning of the upper acrylic resin complete denture with the reinforced palate. (Part 1). Thinning of the resin denture base with the standard shape (author's transl)].

The acrylic denture bases are most commonly used as compared with metallic denture bases at present. For this reason, it is due to many excellent properties, for example, simple processing, easy repair, cheapness and so on. But an inherent disadvantage is liability of an acrylic denture base to make thick so as to maintain stiffness and strength and it makes patients uncomfortable. Therefore, the purpose of this paper is to make the palatal region of the upper complete denture thin with about 0.7 mm in thickness, and to keep the same mechanical properties as the normal resin dentures using the composites materials with carbon cloth. Tensils test of the plate test-piece and uniform bending test of the upper complete denture with steel wings were respectively performed. The results obtained in this investigation are as follows: 1) The acrylic composites reinforced with carbon cloth have shown the superior mechanical properties to be compared with the acrylic resin to be generally used. 2) The thickness of the reinforced thin denture is decreased to 0.7 mm (its thickness is 60% of the normal thickness of the one), nevertheless, the stiffness and strength are increased with the using of the composite materials. 3) The region of highest surface tensile stress in the denture was on the polished surface of the palatal aspect of the denture in the area immediately behind the anteriors, but at this region, the strain of the reinforced thin denture base decreased its strain 10% in comparison with the non-reinforced normal thick one.

Acrylic Resins↗
PubMed1980

[Studies on the thinning of the upper acrylic resin complete denture with the reinforced palate. (Part 2) Influence of the different palate forms on the thin plate dentures (author's transl)].

In this paper, succeeding the study of the part 1 on the thinning of the upper acrylic resin complete denture with the reinforced palate, it was investigated to keep the same stiffness and strength as the normal resin dentures, and to make the patient comfortable. Besides, many different palate forms exist in the patient's mouth in clinical cases, and so, influence of these forms on the thin plate dentures comes into question. Therefore, 3 types of the palate forms (the standard shape, the extremely large torus and the generally shallow shape) were established, and then the flexural stiffness and strength, and the deformation of the denture bases were scrutinized in this paper. The results obtained in this investigation are as follows: 1) The maxillary torus with sheer bulk had little influence on the flexural stiffness and strength. But, about the generally shallow-shaped denture bases, the mechanical properties dropped a little as compared the normal resin denture bases. The reinforced thin denture bases of which thickness was 60% of the normal one, showed the excellent mechanical properties in spite of the difference of the palate forms. 2) In the upper complete denture base, in spite of the palate forms, anteriority and posteriority of the one were deformed against the load direction around the frontal section through the bilateral canines, and the bilateral ridges of the one were deformed to the load direction around the midline of the denture base. The deformation was extremely decreased by not only the palate but also the whole of the denture base as the reinforced one.

Acrylic Resins↗
PubMed1981

Denture adhesives - their effect on the mobility of full upper dentures during chewing. A cineradiographic study.

Using cineradiographic technique an assessment is made of the denture mobility during function in the upper jaw for full denture wearers without and using two types of denture adhesives. One of them with a new formula. Ten randomly selected edentulous patients with moderate alveolar ridge resorption took part in the study. They were rehabilitated with dentures of conventional design in the upper jaw. Cineradiographic registrations were performed in lateral projection without and with the two types of adhesives supplied to the denture base. The analysis of the cineradiographic films disclosed no significant differences for the denture mobility. Neither between the situation without and with denture adhesive nor between the two adhesives. This indicates an obvious limited effect of the denture adhesives, at least for denture wearers with moderate resorption of their alveolar ridges. The only positive effect of the adhesives discovered was a limited number of vertical loosening drops of the distal parts of the denture when the seal was broken.

Adhesives↗
PubMedDate not supplied

Effect of soft denture liner on stress distribution in supporting structures under a denture.

This study examined the effect of a soft denture liner on the distribution of stresses in the denture-supporting structures. Dentures without a linear and with three configurations of a soft liner were simulated by using a two-dimensional viscoelastic finite-element stress analysis. The stress intensity at functional force-bearing areas decreased when a soft denture liner was used. However, the stresses in the bone increased remarkably up to 3.0 seconds after loading. Because of the time-dependent effect of stresses applied to soft denture liners, denture patients who clench or brux may not benefit as greatly from soft denture liners. The study indicates that viscoelastic finite-element analysis is helpful for evaluating soft denture liners. Soft denture liners appear to be useful for improving the stress distribution in the supporting structures under dentures.

Alveolar Process↗
PubMed1994

Open labeled, single arm trial of denture shield for the treatment of dentures.

A new denture product, Denture Shield is described. This product was designed to aid denture wearers. It results in sealing the external surfaces of denture which provides comfort, cleansability and reduces odour while the denture is under function in the mouth. A trial was conducted in which 133 persons were recruited for a four week study. Each participant was well-informed about the product benefits. A total of 71 participants completed the study. The majority of the responses were positive (62 positive responds, representing 87.3% positive). Positive responses included: improved cleansability, food not sticking to the denture, reduced odour, better fitting dentures and more denture comfort. This product is intended as an additional treatment to current denture regimen and seems to provide improved characteristics for denture wearers.

Adult↗
PubMedDate not supplied

[Use of the maximal physiologic load test in the evaluation of functional values of newly made complete dentures and dentures rebased by the Rehm method].

There is a constant dilemma of dental practitioners in contact with patients in whom complete dentures have lost congruent relation toward supporting mucoosseous tegmen if new dentures should be made or rebased by change of denture base. The investigators who have studied those problems have been mostly concerned with problem of material and rebasing procedures of complete dentures. The aim of the study was to determine the functional value of unrebased, rebased by Rehm and new complete dentures and compare the time of initial functional adaptation of patients to rebased and new complete dentures. The study included 72 examinees. The functional value of complete dentures was estimated by test of masticatory muscles, bioelectrical activity by test of masticatory efficacy and by test of maximal physiological load. On the basis of the study it was concluded that complete dentures rebased by Rehm were in function worthier than unrebased, and the period of initial functional adaptation was missing. In the examinees with pair of newly made complete dentures, functional tests revealed the reduction of initial values after the new dentures were delivered. During the examination interval, progressive dynamics with tendency of establishing the optimal functional value and initial functional adaptation was revealed after 21 days.

Bite Force↗
PubMed1989

[Analysis of the denture dynamics in R.P.D.'s. 1. Methods for analyzing the denture dynamics of free-end-saddle].

Excess denture movement during function may cause to jeopardize the resorption of the residual ridges and the mechanical trauma on the abutments in the partially dentate mouth. A removable partial denture (R.P.D.'s) should be so constructed that the artificial teeth on the denture base will be stabilized in their spatial position by way of the compensatory support due to the remaining abutments and the residual ridges. In this pilot study, the ordinary denture movement, that is the denture dynamics in function of the free end saddle R.P.D.'s was measured in the test denture assembly. The denture dynamics was assessed in two ways: The displacement sensors revealed the vertical and the horizontal movement of the denture base during function. They were based on the field magnetic effect and with good lineality. Tiny accerelometer was attached to the denture base to detect the accerelation during function. Ordinary mastication was not interefered by both methods. The Author has already reported the palpation test for diagnosing the denture dynamics of the free end saddles in clinics. This method was discussed objectively against the accerelometry on fifty patients. Two methods have revealed the good coincidence with each other to detect the dynamics of the free end saddles.

Alveolar Bone Loss↗
PubMed1989

The use of denture adhesives as an aid to denture treatment.

Denture adhesives are used by more than five million denture wearers in the United States. All dentists strive to achieve stable, retentive, and comfortable dentures that do not require the use of denture adhesives. However, dentists may prescribe and use denture adhesives as a legitimate therapeutic and effective procedure in denture treatment and in denture aftercare, when indicated. Denture patients should use denture adhesive on the advice of their dentists and should be instructed in its proper use and cautioned against misuse.

Adhesives↗
PubMedDate not supplied

Assessment of shear bond strength between three denture reline materials and a denture base acrylic resin.

PURPOSE: This study reports the effect of five surface treatments on the bond strength established between three denture reline materials and a denture base resin. MATERIALS AND METHODS: Cylindric columns of denture reline materials were bonded to columns of denture base resins that received one of the surface treatments: application of dichloromethane, the monomer of the denture base resin, the recommended bonding agent or the monomer of the denture reline material, polishing with 240-grit silicone carbide paper, and air abrasion. A control group without surface treatment was included for each material. Specimens were immersed in water for 1 day and then thermocycled. The strength at which the bond failed under shear was recorded. RESULTS: None of the surface treatments significantly improved the bond strength of Kooliner. Triad bonding agent and denture base monomer applications most significantly improved the bond strengths of Triad and GC reline, respectively. CONCLUSION: Triad bonding agent and denture base monomer should be used in conjunction with Triad and GC reline, respectively, when relining a denture base resin.

Acrylic Resins↗
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

Relationship between plasticizer content and tensile bond strength of soft denture liners to a denture base resin.

The purpose of this study was to determine the influence of plasticizer content on the tensile bond strength of heat-cured acrylic soft denture liners to a denture base resin. Differences among materials were significant, except for 100 wt% Dibutyl Sebacate (DBS) and 80 wt% DBS of tensile bond strength. The bond strength of all materials to the denture base increased with an increase in thermal cycles significantly except for 40 wt% DBS. The tensile bond strength of soft denture liners to the denture base resin significantly decreased with an increase of plasticizer contents. Differences were found among the difference plasticizer contents in failure types between the denture base resin and soft denture liners. The results suggest that the tensile bond strengths of heat-cured acrylic soft denture liners to the denture base resin were lower with an increase in plasticizer content.

Acrylic Resins↗
PubMed1997

[Denture mobility of complete dentures during function].

The purpose of this study was 1) to verify and apply a system to measure the three-dimensional (3-D) movement of the upper and lower complete dentures and the movement of the mandible with six degrees of freedom, and 2) to analyze the relationship between denture movements and the path of closure of the mandible during functions. A 3-D motion capture system with four infrared TV cameras was used for this purpose. The loci of each of three targets on the subject's head, the upper dentures, the lower dentures, and the mandible were measured three-dimensionally. The relationship between the lower dentures and the mandibular movements was analyzed in the change of the inner product of normal vectors of the denture occlusal planes and mandibular planes. The results were as follows: This system could measure the denture mobility within 3.5 x 10(- 1) mm in error. The mobility of the upper dentures had a correlation to the path of closure of the mandible regardless of the working side or nonworking side, and the lower dentures had a tendency to move toward the working side.

Aged↗