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Results for “Denture Rebasing”

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At least 91 records · Page 5Linked to original sources
PubMed1979

Heat-released stress in acrylic dentures.

Dimensional changes in an acrylic resin denture blank that are sufficient to cause changes in fit on a gypsum cast occur primarily when the dentures are heated in water to a temperature of 90 degrees C or more. The poor correlation between observed fit and the intermolar distance change indicates that the dimensional change of dentures is much more complex than suggested previously and may be the product of factors that are not as yet fully understood. Enough heat to cause distortion of the denture can be produced during the process of grinding the denture. It should be recognized by the dentist, the dental assistant, and the dental laboratory technician that denture resins are sensitive to the techniques that are used in finishing. Overheating even small regions may allow localized dimensional changes that result in distortion of the denture.

Acrylic Resins↗
PubMed1980

Tooth movement and dimensional change of denture base materials using two investment methods.

This in vitro investigation evaluated methods of investing a maxillary denture (1) by using a silicone rubber and gypsum base covering all the artificial teeth and (2) by following the generally accepted procedure of investing in a total gypsum environment. The amount of vertical opening found in dentures processed with silicone investment was approximately the same as for those processed with the all-gypsum technique, the horizontal movement of the teeth was more lingual in the silicone investment technique. Comparing the weight of the residual impression between the denture base of acrylic resin and the master die showed no significant difference between the silicone investments and the gypsum technique. The relined denture base provided a more accurate fit than a heat-cured denture processed in both types of investment, silicone and all-gypsum. Finally, a special device was developed that permitted tooth movement in processed dentures to be measured simply and accurately.

Calcium Sulfate↗
PubMed1980

Fabrication of custom trays from existing dentures.

This technique rapidly and simply provides a custom tray which duplicates the tissue surface of the patient's previous denture. The custom tray is then used as if it were the denture in a reline technique to make a final impression.

Dental Impression Materials↗
PubMed1981

The effect of immediate dentures on maxillomandibular relations.

Immediate mandibular and maxillary dentures were made for six patients to determine the relative changes in the vertical dimension of occlusion and rest position over a 3-month test period. The dentures were mounted on the articular in centric occlusion (habitual). Pilkington-Turner anatomic teeth were used on the maxillary denture, which was set against a flat, noninterfering acrylic resin occlusion rim instead of mandibular posterior teeth. Positional cephalometric measurements in centric occlusion and rest position were made before extraction and at 1-week, 1-month, 2-month, and 3-month intervals. The dentures were relined after 2 months. The results were as follows: 1. In the centric occlusion position the mandible moved forward after 1 week and remained forward for the 3-month test period. 2. The rest position showed no significant change in the anteroposterior position of the mandible with time. 3. The vertical dimension of occlusion and rest showed a gradual decrease over the entire test period. 4. The reline procedure did not affect the trend of the dimensional changes. 5. A noninterfering occlusal scheme is advantageous for immediate dentures.

Adult↗
PubMed1984

Removable prosthodontic treatment needs: a survey.

Population data on complete and removable partial prosthodontics in Iowa indicated the following. Denture wearers tend to be persons in the older age groups. The percentage of edentulous persons was lower than that reported nationally in 1971. Of every 1,000 persons, 156 were wearing dentures in one or both arches. Of every 1,000 persons, 53 needed a repair, reline, or replacement of an existing denture. Of every 1,000 persons, 70 needed a denture but were not wearing one. Persons of lower income and education were less likely to seek dental care but had the greatest need for treatment. Persons of lower income and education were at higher risk of having some form of mucosal lesions. The public will be unlikely to make use of dental services to prevent or treat lesions or to service a prosthesis unless they are specifically educated to do so.

Adult↗
PubMed1984

General considerations prior to relining of complete dentures.

eneral considerations necessary to determine whether a complete denture reline should be attempted or a new denture constructed have been presented. Specific evaluation procedures, including the examination and diagnosis of the patient and the complete denture(s) along with a checklist of complicating factors, have been discussed. Hickey and Zarb have said: "The complicated [nature] of the conditions to be corrected makes [reline] procedures not the simple operations many patients and dentists think they are." The authors emphatically agree.

Denture Rebasing↗
PubMed1984

Treatment needs of overdenture patients in a longitudinal study: five-year results.

This study evaluated the treatment needs of 44 overdenture patients who had worn their dentures for at least 5 years. There were 135 abutment teeth involved, 35 in the maxillae and 100 in the mandible. Recall rates varied from a low of 27.6% to a high of 73.7%. The attrition rate was 20.5% after 5 years. The caries rate varied from a low of 2.7% to a high of 20.6%, and periodontal treatment was required by 94% of the subjects after 5 years. Only 39.4% of the subjects required adjustments, repairs, relines, or remakes of their overdentures during this time. The study showed that the success of overdentures depended on maintaining oral hygiene at an adequate level and at least yearly recalls to maintain gingival health.

Adolescent↗
PubMed1984

Enhanced retention for the distal extension-base removable partial denture using a heat-cured resilient soft liner.

Replacement of the conventional heat-cured acrylic resin with a soft durable liner in the retromylohyoid eminence areas allows the patient to manipulate the distal extension-base mandibular RPD into place without traumatizing the soft tissue. With maximum coverage of the edentulous ridges, the semiflexible flange minimizes food entrapment and improves the retention and stability of the RPD. The procedure can be accomplished during the initial processing of the RPD or when relining the prosthesis. We have also used the technique for overdentures and for improving retention in the maxillary anterior extension-base RPD where anterior clasping was not esthetic or was insufficient.

Denture Design↗
PubMed1985

Studies of biologic parameters for denture design. Part III: Effects of occlusal adjustment, base retention, and fit on masseter muscle activity and masticatory performance.

EMG recordings of ipsilateral and contralateral masseter muscles and standardized masticatory performance tests were made in 20 denture wearers before and after modifications were made to their clinically unsatisfactory dentures. The improvement of retention and stability by correction of gross occlusal prematurities and by the use of a denture adhesive or base reline with a soft tissue-conditioning material did not significantly alter the chewing performance or muscle activity during mastication in denture wearers. The results support our previous findings that the influence of denture factors on chewing ability of denture wearers is limited. To avoid variations in EMG activity caused by changes in electrode positions, all tests for a given subject were made at the same sitting. Thus the study design did not provide time to denture wearers for their neuromuscular mechanism to adapt to the modifications prior to testing masticatory function. A replication of this study that permits sufficient adaptation time after each modification is suggested to validate the findings.

Adhesives↗
PubMed1985

Pressure indicators for removable prosthodontics.

P.I.P. and Coltene pressure spot indicator were tested on the same 30 sets of complete maxillary and mandibular dentures and on two maxillary dentures against natural dentition. They were tested at delivery for pressure spots, but adjustments were not made. They were tested again after 24 hours to visualize and compare actual pressure spots. Half the dentures were adjusted according to P.I.P. and half according to Coltene pressure spot indicator. The patients were recalled after 1 week to determine if they were free from discomfort. The P.I.P. showed a greater clinical correlation of predictable to actual pressure spots and enabled the investigators to spare more patients from post-delivery discomfort.

Dental Stress Analysis↗
PubMed1985

Three-dimensional analysis of maxillary denture displacement during reline impression procedure.

The contourmeter was used to determine quantitatively the denture displacements caused by various impression materials and techniques during the relining of a maxillary denture. This study indicated the following conclusions. Tissue-conditioning material used with closed-mouth impression technique or light-bodied polysulfide used with either open- or closed-mouth technique caused the least denture displacement in the three dimensions when compared with regular-bodied polysulfide or zinc oxide and eugenol impression materials. Comparing the same impression materials used with either open- or closed-mouth technique showed no significant difference in maxillary denture displacements. A relined complete denture should be remounted on the articulator and the occlusion refined to eliminate occlusal mismatches resulting from three-dimensional denture displacements during relining.

Dental Impression Materials↗
PubMed1985

Dental needs and dental service use patterns of an elderly edentulous population.

This study was undertaken to examine an elderly edentulous population to evaluate current dental needs and dental service use rates as well as to determine whether trends toward a reversal of this group's poor dental care habits are present. Of the 443 elderly individuals screened in the current study, 168 were determined to be edentulous in both dental arches. This means that 38% of the elderly population examined would at some time require dental services either to maintain their edentulous arches and related intraoral structures in a state of health or to fabricate new or maintain existing complete prostheses in a properly functioning condition. This figure is 12% lower than 1974 statistics, which indicated that 50% of the nation's elderly population were edentulous. A larger population would have to be surveyed to determine if this trend toward declining edentulousness is a national phenomenon or simply characteristic of the current population sample. Despite the lower proportion of edentulous individuals within the study population, some disturbing results were obtained. Although 92% of the population had complete dentures that they claimed were worn most or all of their waking hours, over 90% of these dentures were evaluated by examiners as requiring significant refinement (26%) or remake (69%). In addition, 58% of this group of individuals felt that they did not or were not sure whether they required current dental treatment; 58% also felt that the fit of their dentures was excellent or good. These figures demonstrated that only slightly more than half the study population was aware that their dentures were in need of corrective treatment.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed1985

Metal minibases in removable prosthodontics.

A description of the designs and indications for minibases in removable prosthodontics has been presented. Minibases can solve complicated space problems when surgery is contraindicated by providing a strong, thin, abrasive-resistant denture base. The result of their correct use is a prosthesis that fits well, is extended correctly, functions without opposing interferences at the correct vertical dimension of occlusion, and resists the functional stresses placed on it during service.

Dental Alloys↗
PubMed1986

Clinical evaluation of ramus frame and staple bone implants.

Atwood pointed out that "variability of human response (resistance to infection, susceptibility to bone resorption, and psychologic capacity) demands more basic research and clinical trials to improve success." This study can serve as a baseline for further longitudinal studies and controlled clinical research. Barring tissue or systemic complications, the prosthodontist must take the responsibility through sound treatment principles and awareness to ensure continued satisfaction and success of these implant systems.

Adult↗