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PubMed2002

The influence of selective grinding on the thickness discrimination threshold of patients wearing complete dentures.

The influence of selective grinding on the ability of patients wearing complete dentures to discriminate thicknesses occlusally was evaluated. The study included two groups of white Caucasian patients, matched for age, sex and duration of edentulism; 12 wearing traditional complete dentures and 12 wearing maxillary complete denture and mandibular implant-retained overdenture (MIR-OVD). The ability to discriminate thickness was evaluated before and after selective grinding. In both groups, sensitivity improved after selective grinding. Subjects wearing MIR-OVD showed a better ability to discriminate thickness than those rehabilitated with traditional complete dentures. The thickness discrimination threshold might be a suitable method to evaluate complete dentures fit.

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PubMed1998

Linear dimensional change of heat-cured acrylic resin complete dentures after reline and rebase.

STATEMENT OF PROBLEM: Relining and rebasing of complete dentures are common procedures to improve the fit of the prostheses. After relining or rebasing, adjustments may be required because of dimensional change that occurs during reprocessing of the denture when new denture base material is polymerized. PURPOSE: This study analyzed the linear dimensional change of heat cured acrylic resin that occurs during reline and rebase procedures for complete dentures. MATERIAL AND METHODS: Twenty-two maxillary and mandibular complete denture bases with artificial teeth were saturated by immersion in distilled water at 37 degrees C +/- 1 degree C. Fine crosses were marked on the incisal edges of the central incisors and the supporting cusps of the second molar teeth. Distances between the marks were measured with a high resolution traveling microscope. Heat-cured acrylic resin was processed by a long curing cycle of 72 degrees C for 6.5 hours, then heated to 100 degrees C for over 30 minutes and kept at 100 degrees C for 1 hour. The relined or rebased denture was allowed to cool slowly in the water bath for 48 hours to reach ambient temperature. The reference-crosses were measured immediately after careful deflasking. RESULTS: In the relining procedure, all incisor-molar and intermolar distances exhibited shrinkage of 0.3%, despite different shapes of maxillary and mandibular dentures. Results of the rebasing procedure were similar to that of the reline expect that only 0.1% intermolar shrinkage was found on the maxillary denture. CONCLUSION: Shrinkage was approximately 0.15 mm for an interarch distance of 50 mm. This degree of change is both clinically undetectable and insignificant. Using this processing cycle for acrylic resin in reline or rebase procedures did not cause clinically significant dimensional changes to complete dentures.

Acrylic Resins↗

PubMedDate not supplied

Design and fabrication technique for metal palates in maxillary complete dentures.

Polymethyl methacrylate exhibits excellent physical properties. Unfortunately, complete dentures fabricated from this material may still fracture. Maxillary complete dentures opposing natural dentition may have a tendency to develop recurrent midline fractures due to multiple reasons. A potential method of preventing this fracture is metal reinforcement of the palatal portion of the prosthesis. A technique will be presented describing a sequence that incorporates predictable design, fabrication and finishing of a metal palate for a maxillary complete denture.

Acrylic Resins↗

PubMed1999

[Influence of wearing complete dentures on body balance in edentulous elderly].

The influence of wearing complete dentures on body balance of edentulous elderly was examined in this study. Eight edentulous volunteers (5 females and 3 males) who were satisfied with their new dentures participated in the study. Static and dynamic balance were compared between subjects with and without dentures. To evaluate static balance, path length of spontaneous postural sway with eyes closed was measured for 60 seconds using a stabilometer. To evaluate dynamic balance, gait cycle, gait velocity, and stride length during 15 meters of free gait were measured using a newly-developed gait-cycle-analyzing device and gait-speedometer. The data analysis showed that path lengths of subjects when wearing complete dentures significantly decreased compared to subjects without dentures (p < 0.05). Subjects when wearing complete dentures performed significantly faster and more stable gait compared to subjects without dentures (p < 0.05). Significant increases were concurrently observed in frequency of gait cycle and stride length (p < 0.05). The results suggested that the presence of an established occlusal vertical dimension had an influence not only on static balance but also on dynamic balance of the subjects. It was concluded that for edentulous elderly, wearing complete dentures may enhance body balance rather than not wearing a complete denture.

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PubMed1989

The development of criteria for the assessment of complete dentures.

Criteria for the assessment of complete dentures have been published by several groups of workers but none have proved universally reliable. The present study was undertaken in an attempt to develop criteria of proven reliability for the assessment of the occlusion, articulation, retention, stability and appearance of complete dentures and the health of their supporting tissues. The criteria formulated were subjected to a series of evaluations of their reliability followed by attempts at refinement where this was unsatisfactory. Although levels of agreement between independent assessments made using the criteria improved as the study progressed, an acceptable level of reliability was not attained. The possible reasons for this are discussed.

Denture, Complete↗

PubMed1994

Phonetic determinants of tooth placement in complete dentures.

The provision of satisfactory complete dentures requires that dentist, technician, and patient adequately fulfill their respective roles in the provision of, and adaptation to, these dentures. The clinician should combine clinical skills and appropriate patient management, in addition to an appreciation of postextraction resorptive changes in the alveolar ridges, if clinically acceptable dentures are to be prescribed. An increasing number of replacement dentures are being prescribed for older patients; thus, the need to utilize functional factors to determine tooth placement is reviewed.

Articulation Disorders↗

PubMed1993

[The reproducibility of the manual checkbite in the wearers of complete dentures].

Thirty-six new complete dentures were remounted by means of check bite records at the time of placement. The mandibular position was recorded three times in each patient by two clinicians using Bite Compound, a thermoplastic material, for the records. After individual transverse horizontal axis localization, the dentures were mounted in an articulator, and subsequently three-dimensional, electronic and computerized measurements were made with a special measuring instrument. In intraindividual comparison the reproducibility of the check bite records resulted in a mean value of 0.37 +/- 0.33 mm, whereby maximum deviations of up to 1.8 mm were observed. Repeated insertion of the maxillary dentures into the hardened impressions of the thermoplastic compound led to an error of 0.04 +/- 0.06 mm. The results of the two clinicians differed only slightly.

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PubMed2004

[The relationship between wearing complete dentures and swallowing function in elderly individuals: a videofluorographic study].

The role of complete dentures in masticatory function is well established, but their effect on swallowing has been little examined. This study investigated the effect of complete dentures on swallowing in the elderly. Lateral projection videofluorography (VF) was performed for nine healthy edentulous elderly volunteers (mean age 73.9 +/- 2.9 years) while they swallowed 8 ml of liquid and paste barium with and without complete dentures. A total of 35 VF records were analyzed for temporal and spatial measurements of oropharyngeal motion during swallowing. The tongue tip contacted the inside of the lip between the upper and lower alveolar ridges during swallowing without but not with complete dentures. The hyoid moved further upward (P = 0.002) during swallowing without dentures (liquid: 5.85 +/- 3.99 mm, paste: 6.41 +/- 5.25 mm) than with dentures (liquid: 3.70 +/- 4.57 mm, paste: 3.69 +/- 4.07 mm). The larynx moved further forward (P = 0.044) during swallowing without dentures (liquid: 6.39 +/- 2.58 mm, paste: 6.46 +/- 2.87 mm) than with dentures (liquid: 5.34 +/- 2.04 mm, paste: 5.93 +/- 1.50 mm). The timing of the movements of these structures was not affected by the presence of the dentures or bolus consistency. These results showed that the hyoid and larynx moved more in swallowing without than with complete dentures, perhaps because of tongue tip protrusion when not wearing dentures. These findings suggest that complete dentures have a significant effect on swallowing function as well as masticatory function in elderly individuals.

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PubMed2002

Agreement between clinical measures of quality and patients' rating of fit of existing and new complete dentures.

OBJECTIVES: To assess agreement between patients' appreciation of fit and clinical assessment of quality of existing and new complete dentures. MATERIALS AND METHODS: In each case existing complete dentures at the initial visit and new complete dentures at the first post insertion visit were assessed by a prosthodontist using a validated method for assessing denture quality. Patients rated fit of existing and new complete dentures on four-point scales. Weighted Cohen's kappa and multiple correspondence analyses were the statistical methods employed in this study. RESULTS: 459 patients completed the study. A statistically "fair" level of agreement was found between clinical and patient assessment of dentures. There was close correspondence between dentist and patient appreciation when the existing dentures were rated as poor and when the new dentures were rated highly. DISCUSSION: A worthwhile level of agreement between patients' appreciation of fit of complete dentures and the clinical assessment of quality of existing and new complete dentures was found. Marked differences in the nature of agreement for patients' and clinicians' rating of new and existing dentures were demonstrated. These results emphasize the importance of denture quality in achieving patient approval. CONCLUSION: Agreement and correspondence between patient and clinician appreciation of existing and new complete dentures were determined.

Adult↗

PubMed2000

[The study of a computer aided artificial teeth arrangement of complete denture].

OBJECTIVE: To develop a system of computer aided complete denture design (CACDD). METHODS: After 3 dimensional measurement, data process and making model of a edentulous model, artificial teeth and the maxillomandibular bite plate, on the position of centric relation, the artificial teeth were arranged according to the principle and demand of the complete denture's teeth arrangement. The relation of teeth and occlusion were adjusted by Affine and Projection transformation. RESULTS: (1) The maxillomandibular visual base on the position of centric relation were made, its mathematics model is B-Spline curve surface of the double third power. (2) The artificial teeth arrangement and 3 dimensional show of the complete denture were achieved. CONCLUSION: This system can provide a feasible tool for a computer aided complete denture design and teaching.

Centric Relation↗

PubMed1989

An evaluation of chewing function of complete denture wearers.

Chairside scoring of chewing function of complete denture wearers has been difficult. This study presents a table for chairside evaluation of the chewing function of Japanese complete denture wearers. The concept can be effective in other countries and permit international comparisons among complete denture wearers.

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PubMed1995

Patient satisfaction and chewing ability with implant-retained mandibular overdentures: a comparison with new complete dentures with or without preprosthetic surgery.

PURPOSE: The objective of this study was to compare denture satisfaction and chewing ability of edentulous patients treated with dental implant-retained overdentures or with full dentures with or without previous preprosthetic surgery. PATIENTS AND METHODS: This study was a controlled clinical trial. Thirty-eight men and 52 women participated in the study. The mean height of the anterior mandible was 21 mm (range, 16 to 25 mm), measured on a lateral cephalometric radiograph. The subjects were randomly assigned to the three treatment modalities. The main outcome measures were denture satisfaction and chewing ability, which were assessed using questionnaires focusing on denture-related complaints and the ability to chew different types of food, and an overall denture satisfaction score. RESULTS: Based on the baseline data from the "denture complaints" and "chewing ability" questionnaires, nine interpretable factors could be extracted. Two factors did not vary following treatment and were excluded from the outcome analysis. At the 1-year evaluation five of seven factors showed significantly better scores for the two surgical groups than for the control group. The same was found for the overall denture satisfaction rate. CONCLUSION: Overdentures retained by dental implants or complete dentures made after a vestibuloplasty and deepening of the floor of the mouth provide a more satisfactory solution for denture-related problems than complete dentures alone. For the scale "functional complaints lower denture," the overdenture group showed even a significantly better score than the preprosthetic surgery group.

Cephalometry↗

PubMed1998

Effect of denture thickness on tooth movement during processing of complete dentures.

In this investigation the effect of denture thickness on tooth movement during processing of complete dentures was studied. A maxillary cast from a patient was duplicated to obtain 10 identical casts. Base plates were constructed on five casts using 1.25 mm thick wax. Base plates were constructed on the other five casts using 2.5 mm thick wax. Teeth were placed on the ridge of each cast and a TMS pin was placed vertically, upright, in each tooth. The dentures were invested, cured, decasted, finished and polished. Each denture was radiographed immediately before processing, after deflasking, on removal from the cast and after finishing and polishing using a standard technique. The radiographs were digitized using an Eikonix image digitizer. The results showed that there were significant variations in tooth movement between thick and thin denture bases. Also an increase in the molar-to-molar distance was found in both the thin and thick dentures but the magnitude of tooth movement was more in thick dentures.

Dental Casting Technique↗

PubMed2000

An investigation of factors influencing patients' use of new complete dentures using structural equation modelling techniques.

UNLABELLED: A review of the literature demonstrated that research had not identified a set of prognostic indicators for prospective complete denture patients, with different authors publishing contradictory results. OBJECTIVE: To investigate possible relationships between patient and clinical factors and denture wear and use of dentures for eating. METHODS: Patients attending Guy's Dental Hospital, London, for provision of complete dentures were recruited. For each patient relevant history was recorded and an examination of the edentulous mouth and existing dentures, where present, was undertaken at the beginning of treatment. At the first post-insertion appointment the edentulous mouth, previous and new dentures were examined. Three months after the review appointment patients were sent a postal questionnaire to assess patient use of dentures and patient satisfaction. Data were analysed using structural equation modelling techniques. RESULTS: 723 patients were recruited. Significant relationships were found between quality of complete dentures and patients' use of complete dentures and between quality of residual edentulous ridges and patients' use of complete dentures. These results contrast with most previous research into prognostic indicators for success in complete denture treatments. CONCLUSIONS: Quality of residual edentulous ridges and quality of new complete dentures predict patients' use of new complete dentures.

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PubMed1992

Considerations for planning for and fabricating complete dentures.

During the past year, studies have been completed to advance our knowledge of the diagnosis and treatment of the edentulous patient. The need for pretreatment radiographs on every edentulous patient is not always indicated. Advances in preprosthetic surgery help to improve the predictability of these procedures. New techniques for establishing the vertical dimension of occlusion may allow this to become a more objective measurement. Evaluation of dental materials for use with complete dentures continues, with soft liners and the use of microwave energy for curing denture resin just two areas of interest. A recent study showed a very high prevalence of signs and symptoms of craniomandibular disorders among complete denture wearers. Methods for its treatment are discussed. The use of increased infection control procedures in the dental office and laboratory have created a need to evaluate the effects of disinfecting agents on the dental prosthesis. The removable complete denture remains an effective alternative for the replacement of missing teeth.

Dental Occlusion↗

PubMed1990

[Influence on the movement of a complete denture caused by differences in artificial tooth materials].

An experiment using modal analysis was used to ascertain the activity of complete dentures and artificial teeth. Three types of artificial teeth were used: a porcelain tooth, a resin tooth and a hard resin tooth. Animation and displacement values were used as criteria in determining the influence that differences in tooth materials had on the activity of the complete denture. The experiment was conducted to act as an aid in denture design and the following results were obtained: 1. The resonance frequency for the different test materials ranged from mode 4 to mode 7. 2. Regarding displacement value, a value of 1 micron or more was obtained in the 1 octave bandwidth for the 250 Hz band, 500 Hz band and the 1 kHz band. Among these, maximum displacement for the upper complete denture was as follows: When a porcelain tooth was used and a vibration of 1 for mode 1 (197 Hz) was applied, the value for the 3 cusp tip was 39.48 microns and that for the labial denture border side was 43.35 microns. As for the lower complete denture, when a porcelain tooth was used and 5 oscillation was applied for mode 1 (309 Hz), the value for the 3 cusp tip was 68.38 microns and that for the rear part of the denture border was 139.2 microns. 3. Regarding the activity of the complete denture in the 250 Hz and 1 kHz bands, when a porcelain tooth was used, a curve mode was observed for the upper complete denture in the labiolingual direction with the cervical line as the border. When the resin tooth and hard resin tooth were used, it was difficult to recognize any change with the cervical line as the border. It was also difficult to recognize a change at the cervical section for the lower complete denture. 4. As for the 500 Hz band, when a porcelain tooth and a resin tooth were used, there were frequencies (300 Hz-400 Hz) at which twisting in a labiolingual direction at the cervical section was recognized for the upper complete denture as well as frequencies (400 Hz-600 Hz) where this was not recognized. A rigid body mode was recognized when the hard resin tooth was used. In addition, differences in the location for applying for vibration had an influence on the activity of the lower complete denture.

Acrylic Resins↗

PubMedDate not supplied

[Characteristics of fractures in complete dentures].

The analysis of fractures of the acrylate complete denture was performed in 200 patients taking into account age of patients, duration of denture usage, localization of fracture, frequency of fracture, number of denture per patient, and the state of the opposite jaw. There were 71,5% males and 60% female patients with the age from 60 to 69 years. The use of denture ranged from 10 to 15 years and the incidence of fracture was the largest in the first five years of denture use. One to three fractures usually occurred. In the largest number of patients, even up to 54%, it was the second denture. The acrylate opposite jaw complete denture had 43,5% of patients.

Adult↗

PubMed2004

Evaluation of unstimulated flow rates of whole and palatal saliva in healthy patients wearing complete dentures and in patients with Sjogren's syndrome.

STATEMENT OF PROBLEM: The palate and upper lip are the regions of oral mucosa covered with the least amount of saliva. These areas are important for maxillary denture retention and stability. Thus, patients with xerostomia or hyposalivation may have problems with the stability of maxillary complete dentures. PURPOSE: The purpose of this study was to compare the unstimulated whole saliva (UWS) and palatal saliva (PS) flow rates of healthy patients wearing complete dentures and patients with Sjogren's syndrome (SS) and to determine whether xerostomia or hyposalivation has a negative influence on maxillary complete denture stability. A further aim was to determine the influence of new complete dentures on UWS and PS flow rates in healthy individuals. MATERIAL AND METHODS: Thirty-five complete denture wearers, 24 healthy individuals (controls) and 11 patients who fulfilled the diagnostic criteria for primary Sjogren's syndrome (as proposed by the European Community Study Group) were investigated. All participants were questioned about possible subjective oral complaints (xerostomia or instability of the dentures) through use of a standardized questionnaire. In the first part of the study, UWS and PS flow rates of the healthy subjects (controls) and of the SS patients were measured at the initial visit. The flow rate of UWS (mL/min) was collected by the "spitting" method; saliva was collected into preweighed vessels for 5 minutes while subjects were seated in an upright position. Patients were asked to refrain from smoking, eating, and drinking for 2 hours prior to the test session, to avoid swallowing, and to make as few movements as possible during the procedure. The PS flow rate (microL/min/cm2) was measured using previously weighed filter paper discs placed bilaterally in the region of the maxillary second molars, 15 mm palatally from the edentulous ridge, for 30 seconds. The measuring vessels and paper discs were weighed before and after each collection. In the second part of the study, new complete dentures were fabricated for healthy patients. Flow rates of UWS and PS were measured 7 days after the insertion to compare data with prefabrication values. Mann-Whitney and Wilcoxon rank sum tests and chi-square test were used to analyze the data (alpha=.05). RESULTS: The UWS flow rates were significantly lower in SS patients compared to healthy controls (0.36 +/- 0.33 vs 0.09 +/- 0.11 mL/min, P<.05), yet the PS flow rate for both groups was not significantly different. Although every SS patient had xerostomia, and 8 out of 11 had hyposalivation, no patient complained about denture instability. Neither UWS flow rate (0.36 +/- 0.33 mL/min and 0.39 +/- 0.35 mL/min) nor PS flow rate (1.66 +/- 0.99 microL/cm2/min and 1.86 +/- 0.45 microL/cm2/min) was different from the preinsertion values after 1 week of new denture insertion in healthy patients. CONCLUSION: Palatal mucous saliva may help stabilize the maxillary complete denture in patients with hyposalivation. The results suggest that neither UWS or PS flow rate are influenced by the placement of new dentures in complete denture wearers.

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