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PubMedDate not supplied

Dimensional stability of distances between posterior teeth in maxillary complete dentures.

The aim of this study was to assess the displacement of posterior teeth in maxillary complete dentures stored in water at 37 degrees C. Twenty acrylic resin-based maxillary complete dentures were constructed with the anterior teeth arranged in normal overlap and the posterior teeth in Angle class I. Metallic pins were placed on the labial cusp of the first premolars (PM), and on the mesiolabial cusp of the second molars (M). The final acrylic resin pressing was made in a metallic flask with aid of the RS tension system, and polymerized in a moist-hot cycle at 74 degrees C for 9 hours. The dentures were deflasked after cooling in their own polymerizing water or after cooling in polymerizing water plus bench storage for 3 hours, and stored in water at 37 degrees C for periods of 7, 30, and 90 days. Following deflasking and after each storage period tested, the PM-PM (premolar to premolar), M-M (molar to molar), LPM-LM (left premolar to left molar), and RPM-RM (right premolar to right molar) distances were measured with an STM Olympus microscope, with an accuracy of 0.0005 mm. Collected data were submitted to ANOVA and Tukey's test (5%). There was no statistically significant difference for the PM-PM, M-M, and LPM-LM distances after all storage periods when the flask cooling methods were considered. With exception of the RPM-RM distance after the 30-days water plus bench storage period, the other distances remained statistically stable.

Acrylic Resins↗
PubMed2004

[Energy relieving effect of different thickness of mucosa beneath mandibular complete denture].

OBJECTIVE: To analyze the energy relieving effect of different thickness of mucosa beneath mandibular complete denture and try to analyze clinical question of prosthodontics using energy analysis methods. METHODS: A 3-DFE model of the mandibular complete denture and its supporting tissue were set up. Their elastic deformed energy and the percentage in the whole system were respectively calculated when mucosal thickness was different. RESULTS: The percentage of mucosal elastic deformed energy grew from 44.53% to 52.91% and 57.91% with its different thickness under static loads. CONCLUSIONS: The energy relieving effect of mucosa grows with its thickness and the approach of energy analysis is one of effective method on oral biomechanics questions.

Biomechanical Phenomena↗
PubMed2003

Preclinical complete dentures curriculum survey.

PURPOSE: A survey of U.S. dental schools was conducted in 2001 to determine the curricular structure, teaching philosophies, and techniques used in preclinical complete denture courses. MATERIALS AND METHODS: The questionnaire was mailed to the chairperson of the prosthodontic/restorative departments of 54 U.S. dental schools. Of these, 43 schools returned the completed survey, a response rate of 80%. The mean, median, and range of responses were computed where applicable. RESULTS: Results from this survey show that the mean student-to-faculty ratio in the preclinical course was 12:1, with a median of 12:1 and a range of 6:1 to 27:1. The mean number of laboratory hours was 74, with a median of 70.5 and a range of 31.5 to 160. The mean number of lecture hours reported was 28, with a median of 25 and a range 12 to 80. The mean number of practical examinations was 3, with a median of 3 and a range of 0 to 11. Eighty-four percent of the schools have prosthodontists teaching the course. The mean number of months that this course is taught is 5 months, with a median of 5 and a range of 2 to 13. Fifty-eight percent of the schools use the Hanau semiadjustable articulator. Sixty-five percent of the schools use protrusive records to set the articulator. The facebow preservation record is used by 84% of the schools. CONCLUSIONS: Preclinical complete denture educational programs vary from school to school, yet a large percentage of schools agree on certain topics. Only 28% of dental schools are incorporating new technologies, such as the internet, in their preclinical complete denture curriculum. Nineteen percent of dental schools are using only the Portrait denture teeth, which are newer than the Bioblend and Bioform teeth.

Curriculum↗
PubMedDate not supplied

Age-related change of masticatory function in complete denture wearers: evaluation by a sieving method with peanuts and a food intake questionnaire method.

Age-related changes in masticatory function were investigated in complete denture wearers. The sieving method using peanuts as a test food was compared with the result obtained using a food questionnaire for evaluation of masticatory function. In relationship to aging, both the masticatory performance and the chewing score decreased significantly (the masticatory performance: r = .60, P < .01; the mastication score: r = -.46, P < .05). It is suggested that the masticatory function in complete denture wearers decreases in relationship to aging. The food intake questionnaire is useful for evaluating masticatory function in complete denture wearers.

Age Factors↗
PubMed2004

What do patients expect from complete dentures?

OBJECTIVES: An investigation was undertaken with the aim of determining whether patients wearing complete dentures in dental hospital (DH) and dental practice (DP) had different expectations from their dentures, together with their requirements for information about denture construction and oral and denture care. METHODS: A total of 214 edentulous patients, with a mean age of 69 years, from DP (125) and DH (89) participated in the questionnaire-based study. A valid questionnaire (P-DEQ) was constructed which demonstrated good test-retest reliability (Cronbach's alpha 0.86). The P-DEQ sought to determine how patients responded to a series of questions related to what dentists are urged to achieve with complete dentures. The questions covered not only what might be termed "normative" expectations but also patients' perceived needs for further information about the stages of prosthodontic treatment and oral or denture care. RESULTS: Significant differences (p< or =0.001) emerged between the two groups; 82% of the DH group thought it essential that their dentures caused no pain compared with 59% of the DP group; for "absence of slackness" (DH 87%; DP 65%), and "good bite" (DH 82%; DP 55%). No significant differences emerged for the other parameters investigated, but both groups had high expectations for ease of chewing, speech, and good appearance. Differences (p<0.05) between the groups also emerged with respect to the demand for more information regarding the stages involved in denture construction (DH 57%, DP 76%) and how to care for dentures (DH 75%, DP 89%). Large proportions of patients from both groups would prefer to have more information about the selection of teeth (71% DH, 72% DP), and how to care for their mouths (84% DH, 86% DP), but there were no differences between the groups in these parameters. CONCLUSIONS: Most patient expectations appear to equate with the normative view expressed in standard prosthodontic texts. However, expectations may differ not only between individuals but also between patient groups managed in teaching hospital and DP settings. Edentulous patients also need information regarding the stages involved in denture construction and how to care for their mouths and dentures. This may have implications for the management of edentulous patients in DP and dental hospital.

Aged↗
PubMed1991

A comparative study of mastication between complete denture wearers and dentate subjects.

A computer system was used for simultaneously collecting and processing mandibular movements and the myoelectric activities of the masticatory muscles of 15 dentate subjects and 11 complete denture wearers. The displacement, velocity, cycle of mandibular movements, and the muscular mean potentials were indices in observing mastication. A good complete denture should perform with physiologic characteristics, and restore masticatory function and oral health. The kinetic energy from the velocities of lateral and vertical directions can serve for the chewing and comminution of food, but lateral comminution may affect denture retention. The mean myoelectrical potentials of the mandibular elevator muscles of complete denture wearers tend to increase at the opening phase; however, the potentials decrease at the closing phase.

Adult↗
PubMed2004

[The change of F2 and B2 in patients with complete denture].

PURPOSE: To study the clinic adaptive effect of speech articulation of patient with complete denture. METHODS: The sensitive utterance study was /zi/, /ci/, /si/, which was input into CSL directly before and after patient's restoration at the beginning, then at 1 week, 2 weeks, 4 weeks and 8 weeks, B2 of the utterance of 30 edentulous patients were measured by the computer. RESULTS: There were significant differences in F2 and B2 before and after patient's restoration. CONCLUSION: There is a definite regularity of speech articulation after restored with complete denture. CSL helps us to analyze speech articulation by visual accessing and provides basic theory of evaluation in clinical dental prosthetics.

Aged↗
PubMedDate not supplied

Radiographic findings, ridge resorption, and subjective complaints of complete denture patients.

To evaluate the relationship between the complaints of complete denture wearers and alveolar bone resorption as well as the location of mental foramina, 96 patients were interviewed. All subjects had received new dentures at the University of Iowa between August 1985 and July 1990. Panoramic radiographs had been made for all the subjects before dentures were fabricated. The amount of estimated ridge resorption correlated significantly with the number of years females had been edentulous, but no correlation was found in males. The location of the mental foramen in relationship to the crest of residual ridge correlated negatively with the number of years both genders were edentulous. Subjective need for dental treatment, as expressed by "sore gums" or poor or fair chewing ability, were the most frequent complaints among the subjects. These complaints were more often recorded with the subjects who had lost more than 50% of their estimated original ridge height than with those with less than 50% resorption, but this difference was not significant.

Aged↗
PubMed1992

Comminution of food by complete-denture wearers.

A method for quantifying the comminution of an artificial test food (Optosil) was evaluated with respect to its suitability for measurements of masticatory performance in complete-denture wearers. Reference was made to subjects with natural dentitions. The description of particle size distributions generated by complete-denture wearers by a Rosin-Rammler equation was subject to limitations, due to the presence of large proportions of almost-intact particles, which had hardly been damaged or broken during chewing. This finding might be explained by: (i) the relatively high fracture strength of Optosil as compared with natural foods; and (ii) the limitations of complete-denture wearers in exerting bite forces. The particle size distributions obtained after repeated measurements and described by linear interpolation of data points were reproducible. In comparison with young adults with natural dentitions, the denture-wearers needed approximately seven times more chewing strokes to achieve an equivalent reduction in particle size.

Adult↗
PubMed2004

Kinesiographic study of complete denture movement related to mucosa displacement in edentulous patients.

The mucosa that covers the residual ridges of edentulous patients may present some distortion or displacement when occlusal loading is applied in complete dentures. This distortion and movement of the denture can result in acceleration of residual ridge resorption and loss of retention and stability. The aim of this study was to analyze the pattern of upper complete denture movement related to underlying mucosa displacement. A sample of 10 complete denture wearers was randomly selected, which had acceptable upper and lower dentures and normal volume and resilience of residual ridges. The kinesiographic instrument K6-I Diagnostic System was used to measure denture movements, according to the method proposed by Maeda et al.7, 1984. Denture movements were measured under the following experimental conditions: (A) 3 maximum voluntary clenching cycles and (B) unilateral chewing for 20 seconds. The results showed that under physiological load, oral mucosa distortion has two distinct phases: a fast initial displacement as load is applied and a slower and incomplete recovery when load is removed. Intermittent loading such as chewing progressively reduces the magnitude of the denture displacement and the recovery of the mucosa is gradually more incomplete.

Aged↗
PubMed2004

The hollow maxillary complete denture: a modified technique.

The severely atrophic maxilla poses a clinical challenge for fabrication of a successful complete denture. This article describes a novel method for fabrication of a hollow maxillary complete denture. It incorporates a clear, pressure-formed matrix of the trial denture external contours to facilitate the fabrication of a silicone putty cavity form. This cavity form ensures the appropriate dimensions of both the denture base acrylic resin for structural integrity and the denture base cavity for optimal weight reduction.

Acrylic Resins↗
PubMed2003

Assessing the space limitation inside a complete denture for implant attachments.

Accurate determination of the space defined by the physiological contouring of a complete denture (before and after implant surgery) is required during the treatment-planning phase for an implant overdenture. This determination assists in formulating the proper surgical treatment plan and in selecting the appropriate independent implant overdenture attachment. This article presents a technique that provides clear, visual space limitation analysis of the removable prosthesis. The described method allows the clinician to determine the available space before the implant or attachment is placed.

Dental Abutments↗
PubMed2006

[A case of complete dentures with improvement of mandibular position].

PATIENT: A patient visited our hospital for fabrication of functional complete dentures to resolve masticatory disturbance. The case was diagnosed as edentulous jaws with inadequate mandibular position and movement. Therefore, new complete dentures were fabricated and set without reference to the old dentures. DISCUSSION: For the diagnosis, clinical treatment and recall, each objective examination was suggested to be useful. CONCLUSION: The patient was satisfied as a result of the improvement of denture base, mandibular position, and mandibular movement after informed consent.

Aged↗
PubMedDate not supplied

Regaining pleasure and success with complete denture services.

The techniques used by Earl Pound for denture construction are stated, and their application to contemporary denture construction and implant-based prosthodontics is discussed. Positioning the anterior teeth using the mandibular movements of speech, the use of lingualized occlusion, and the fabrication of diagnostic provisional removable complete dentures--all hallmarks of the Pound technique--are described. It is the author's experience that many patients are content with properly fabricated conventional dentures and do not require dental implants for retention, comfort, and stability of their prostheses.

Dental Occlusion, Balanced↗
PubMed1980

A technique for the delivery of complete dentures.

This article describes a technique for the delivery of complete dentures which allows the patient to adapt to a mandibular prosthesis and, at the same time, to functionally make a final refitted mandibular impression.

Denture Design↗