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At least 199 records · Page 11Linked to original sources
PubMed2004

The effect of reinforcement with woven E-glass fibers on the impact strength of complete dentures fabricated with high-impact acrylic resin.

STATEMENT OF PROBLEM: The fracture of acrylic maxillary complete dentures occurs frequently during service through heavy occlusal force or accidental damage. PURPOSE: The purposes of this study were to measure the impact strength of maxillary complete dentures fabricated with high-impact acrylic resin and to evaluate the effect of woven E-glass fiber-reinforcement on the impact strength of the complete dentures. MATERIAL AND METHODS: Preimpregnated woven E-glass fibers (Stick Net) were used to reinforce 10 complete denture bases fabricated with a heat-polymerized high-impact acrylic resin (Lucitone 199). Ten unreinforced complete dentures served as a control group. All specimens were stored in water at 37 degrees C for 2 months before testing. The impact strengths (J) of the dentures were measured with a falling-weight impact test. The impact strengths of both groups were compared by a repeated measures analysis of variance (alpha=.05). The Weibull distribution was also applied to calculate the cumulative fracture probability as a function of impact strength. RESULTS: The mean impact strength of the control dentures was 90.0+/-38.1 J at crack initiation, and 95.9+/-37.7 J at complete fracture, whereas the impact strength of reinforced dentures was 201.7+/-77.9 J and 277.9+/-102.5 J, respectively. Statistical analysis showed that impact strength of the high-impact acrylic complete denture was significantly increased by the addition of woven E-glass fiber (P<.0001). CONCLUSION: The impact strengths of maxillary complete dentures fabricated with high-impact acrylic resin increased by a factor greater than 2 when reinforced with woven E-glass fiber.

Acrylic Resins↗
PubMed2002

Will there be a need for complete dentures in the United States in 2020?

Currently, there is much speculation among dental educators that the need for complete dentures will decline markedly in the future and that complete denture training should be removed from the dental curriculum. Estimates based on national epidemiologic survey data indicate that edentulism has declined by 10% every decade and that only 90% of edentulous adults obtain and wear complete dentures. However, when the number of adults in each specific age group is multiplied by the percentage who need a complete maxillary or mandibular denture, the results suggest that the adult population in need of 1 or 2 complete dentures will increase from 33.6 million adults in 1991 to 37.9 million adults in 2020. The 10% decline in edentulism experienced each decade for the past 30 years will be more than offset by the 79% increase in the adult population older than 55 years. The clinical implications of these findings are twofold: First, practicing dentists will find that a sizable minority of the patient population will continue to need complete denture services; and second, if training in complete denture prostheses is eliminated from the dental education curriculum, millions of patients will be forced to seek denture services from alternative providers.

Adult↗
PubMed2000

A method for quantifying overall satisfaction of complete denture patients.

Reproducible and quantitative evaluation of patient satisfaction with their complete dentures is of great importance for preoperative diagnosis, treatment planning and assessment of complete denture treatment outcome. This study attempted (1) to clarify the degree of contribution of various factors to overall satisfaction, and (2) to develop a method for quantitative assessment of overall satisfaction with complete dentures. Twelve satisfaction factors and a three-grade scale were used to assess 302 complete denture patients. The contribution of each grade of the 12 factors to the overall satisfaction level was determined by multiple regression analysis. Seven factors were highly correlated to the overall satisfaction. Based on the level of contribution by these seven significant factors, a scoring method for satisfaction was established. Category scores for these factors were calculated and the sum of the category scores was converted to an integer between 0 and 100. The resulting quantification score was closely correlated with overall satisfaction. A protocol for scoring overall satisfaction was developed based on the scientifically analysed contribution of each satisfaction factor.

Aged↗
PubMed1979

Bite force and oral function in complete denture wearers.

Oral function was evaluated in complete denture wearers by using a questionnaire, clinical examination and bite force measurements. Ten patients with satisifactory and ten with unsatisfactory dentures were studied and six of the latter patients were reexamined 1 year after the insertion of new dentures. The bite force values were compared with those obtained in ten dentate controls. No significant differences in bite force were found between the satisfactory and unsatisfactory denture groups. Individual values varied much in both groups. The six patients re-examined were satisfied with their new dentures and thought they had improved chewing but no significant increase of bite force was found. The maximal bite force was 5-6 times greater in the dentate subjects than in the denture wearers. Edentulous persons are very handicapped in masticatory function and even clinically satisfactory complete dentures are poor substitutes for natural teeth.

Adult↗
PubMed1999

Improving aesthetics in patients with complete dentures.

An increasing number of patients with complete dentures are requesting improvements in the aesthetics of their dentures. This paper considers methods of improving aesthetics, using the information available from the existing complete dentures, pre-extraction records and resin stains.

Aged↗
PubMed1997

Trial of duplication procedure for complete dentures by CAD/CAM.

The purpose of this study was to duplicate the shapes of complete dentures by using a computer-aided design/manufacturing (CAD/CAM) system. The shapes of the complete dentures of an edentulous patient were measured using a non-contact type shape measurement system and morphological data at the interval of 0.25 mm were obtained in the X-axis and Y-axis directions. Measurement was performed from the occlusal surface and mucosal surface sides. Based on the three-dimensional morphological data, cutter paths for cutting were generated. For cutting, the three-step method consisting of rough cutting, finish cutting, and partial finish cutting was used and for duplicating the dentures the modelling wax was cut using a computerized numerical control (CNC) processor and ball-end mills with diameters of 6 mm and 1 mm. The method for the controlling of three axes (X, Y, and Z) of CNC machine was used, and cutting was performed only from two directions. Although further improvements are needed in the measurement and cutting in acute slope areas, the duplication of complete dentures appears to be possible using the CAD/CAM system.

Analog-Digital Conversion↗
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↗
PubMedDate not supplied

An examination of the stress distribution in a soft-lined acrylic resin mandibular complete denture by finite element analysis.

PURPOSE: The aim of this study was to calculate the effect of a soft liner on stress distribution within a mandibular complete denture. Although patients have welcomed soft-lined complete dentures, early fracture is one of the main reasons for failure. To minimize and prevent prosthesis fracture, the understanding of the stress distribution within a prosthesis is important. MATERIALS AND METHODS: A 3-dimensional finite element model of a mandibular complete denture for a severely reduced residual alveolar ridge was constructed. The stress was calculated with linear static finite element analysis. The stress distribution in the soft-lined acrylic resin mandibular complete denture was compared with that of a conventional acrylic resin denture. The resulting stresses were displayed in terms of von Mises equivalent stress and the major principal stresses according to 5 different loading conditions: vertical loads in premolar, molar, and incisor regions; and oblique loads in premolar and molar regions. RESULTS: Oblique loads produced higher levels of stress in the labial notch regions than vertical loads, where tension was the primary mode of stress. Significantly reduced levels of von Mises stress were calculated in soft-liner layers under all loading conditions. Acrylic resin denture base portions, however, exhibited higher levels of von Mises stress in soft-lined complete dentures. CONCLUSION: Three-dimensional finite element analysis gave a realistic explanation of denture fractures and patient response to mandibular complete dentures with and without soft linings. Control of excess lateral occlusal contact might be helpful to reduce the probability of a fracture in soft-lined mandibular complete dentures.

Acrylic Resins↗
PubMed1999

Effect of weight change of mandibular complete dentures on chewing and stability: A pilot study.

STATEMENT OF PROBLEM: Little is known as to whether denture weight contributes to the retention and stability of mandibular complete denture. PURPOSE: This study compared the jaw movements and denture retention, stability, and comfort of heavy and light weight mandibular complete dentures. MATERIAL AND METHODS: Mandibular complete dentures of 12 subjects were duplicated using an autopolymerized polymethyl methacrylate (PMMA) resin. The heavy weight denture was set with weights (20 or 60 g) and the lightweight denture was packed with wax instead of weights. Masticatory movements (3 times each) and denture stability (5 times each) were measured. The subjects expressed their denture preference for comfort and chewing. Results were analyzed using ANOVA and Wilcoxon tests at significance level of alpha=.10. RESULTS: Masticatory movements and denture retention were not significantly (P >.10) affected by increasing the weight. Five subjects preferred the heavy denture and 4 subjects preferred light denture for comfort; 3 subjects had no preference. CONCLUSION: The weight of a well-fitting mandibular complete denture did not affect jaw movements, denture stability, or patient preference.

Acrylic Resins↗
PubMed2002

[A clinical application of the T-Scan II system--usefulness for evaluating occlusal contacts of complete denture wearers].

The purpose of this study was to assess the reproducibility of the T-Scan II system and its clinical usefulness for evaluating occlusal contacts of complete denture wearers. The occlusal contacts of 13 dentate subjects, and 14 complete denture wearers, were recorded using a T-Scan II system during maximum voluntary clenching. The recordings for complete denture wearers were taken after each treatment for the new denture, and continued until the completion of all corrections. The recordings for complete denture wearers were analyzed using repeated measured ANOVA. In addition, the variables obtained with the system, the delta of the occlusal area and load, and the maximum-load time (MLT), which represented the time length taken to reach the occlusal load at the maximum level, were then compared between dentate subjects and complete denture wearers, using a t-test. The conclusions were as follows: 1. The standard errors values for both occlusal area and the load recordings for the dentate subjects were limited to within 10% of the means. 2. The values of the occlusal area and load significantly increased, and delta of the occlusal area and load significantly decreased, as the denture corrections were repeated. 3. The means of the MLT were about 0.3 seconds for dentate subjects, and 0.8 seconds for complete denture subjects. It was revealed that the T-Scan II showed acceptable reproducibility, and it was useful to evaluate occlusal contacts of complete denture wearers.

Adult↗
PubMed2003

Effect of complete dentures on dynamic measurement of changing head position: A pilot study.

STATEMENT OF PROBLEM: Complete dentures contribute significantly to the facial esthetics of edentulous patients. However, information as to the effect of complete dentures on the natural position of the head is limited. PURPOSE: The purpose of this pilot study was to evaluate the immediate and 30-day effect of wearing complete dentures on the dynamic natural head position measured during walking. MATERIALS AND METHODS: The sample consisted of a volunteer group of 16 patients, 8 women and 8 men, who received new complete dentures. The ages of the subjects ranged from 45 to 64 years (mean=52 years). Dynamic measurement of head posture was carried out by a specially constructed inclinometer device. Each subject in turn was fitted with the inclinometer system and instructed to walk in a relaxed manner for 5 minutes. The data, measured as degrees, were stored in a pocket data logger. This procedure was repeated before insertion of dentures (T1), immediately after insertion of dentures (T2), and 30 days after insertion of dentures (T3). Stored dynamic head posture data were transferred to computer for analysis. The means of the measurements were statistically compared with Friedman and following Wilcoxon tests (alpha =.05). RESULTS: Twelve of 16 (75%) subjects showed an average of 4.6 degrees of cranial extension immediately after insertion of dentures. Six (37.5%) subjects showed an average of 6.4 degrees of cranial flexion, and 8 (50%) subjects showed an average of 5.2 degrees of cranial extension at T3 relative to the T1 measurement. Dynamic head posture measurements of the other 2 subjects remained unchanged. There were significant differences between different measurements of dynamic head posture positions (P<.025). However, only the T1 and T2 measurements were significantly different (P<.015). CONCLUSION: The findings indicate that the statistically significant average extension 4.6 degrees in subjects immediately after insertion of complete dentures was not stable after a 30-day evaluation period and did not produce any statistically significant change. The overall effect of wearing dentures was an irregular flexion or extension pattern on dynamic head posture.

Dental Occlusion, Balanced↗
PubMed2001

[Development of a system for robot aided teeth alignment of complete denture].

OBJECTIVE: To develop a robot aid aligning artificial teeth for complete denture. METHODS: The CRS-450, a 6-direction-free robot was utilized to make the grasped object realize any position and pose, and to develop an adjustable tooth arrangement machine. The geometry parameters of the shape of agomphious jaw were obtained through 3-D laser scanning and measuring system. The math's model, which was set up according to senior prosthodontic experts' experiences on tooth arrangement, was used to control program of experts in arranging teeth, 3-D denture simulation, and robots in arranging teeth. The program used VC++ and RAPL robot languages. When the teeth arrangement plan was formed, the data were transmitted to a robot, who would fix the position and finish the fabrication of complete denture. RESULTS: A complete system of robot-aided complete denture teeth arranging was set up and tried using this system to make an artificial dentition for a patient. There were still some errors in the articulation of the dentition, which needed adjustment and perfection. CONCLUSIONS: We succeed in using robot to fabricate artificial dentition for the first time. Although the dentition is not perfect in articulation, the system's scientific significance is profound. The results have proved that the designing idea and technical routine are workable.

Denture Design↗