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Results for “Denture Retention”

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At least 127 records · Page 7Linked to original sources
PubMed1999

Method for enhancing retention in complete denture bases.

STATEMENT OF PROBLEM: Physical retention of a denture depends on adhesion of a salivary film to its fitting surface and supporting tissues. Adhesion is influenced by many factors. PURPOSE: This study examined the effect of the texture of the fitting surface on denture retention. MATERIAL AND METHODS: According to the method developed, mucosal-supported palatal bases were made for 10 dentate subjects who had no obvious oral disease, history of allergy to dental materials, or palatal mucosal undercuts. A specially designed strain gauge force transducer and a pen-chart recorder were used to record forces that were needed to dislodge the bases from the palate. Forces were recorded 30 times (10/day) for each subject. Similar forces were recorded after the fitting surface of each base was uniformly air-particle abraded under 4 kg/cm2 of pressure for 1 minute with 50-microm grit alumina dust. Data were analyzed with a 2-sample Student t test and a paired t test. RESULTS: Substantial variations for all measurements were observed both between and within subjects. Notwithstanding, these variations, the mean retention of the bases significantly (P <.05) increased by more than 2-fold when the fitting surface was air-particle abraded. These force values were similar to those recorded previously for well-fitting mucosal-supported palatal bases in a separate group of dentate subjects. CONCLUSIONS: While reinforcing the importance of good adaptation of the denture to the tissues, these findings also suggest that an additional improvement in denture retention can be accomplished after the fitting surface is air-particle abraded.

Adult↗
PubMed1986

Effects on retention of reducing the palatal coverage of complete maxillary dentures.

Twenty patients with complete dentures in both jaws gave up their maxillary ones for experimental purposes for 4 weeks while new dentures were made. The experimental dentures were reduced palatally to a new U-shaped border situated approximately 10 mm from the dental arch. Denture retention, defined as the ability of a denture to remain seated on the supporting tissues under various conditions, was measured as resistance towards cranially directed tilting loads, using a miniature bite force recorder. Dislodgement-provoking loads were applied to the first bicuspid on both sides and to the central incisors. The retention measurements were performed before and immediately after reduction of the palatal coverage and, finally, after 4 weeks. Interview questions were posed concerning the subjects' experience of denture retention and some other aspects of oral comfort. The interviews were carried out before reduction of the palatal coverage and after 2 and 4 weeks. The results of the experimental dislodgement tests suggested that the ability to withstand tilting loads was insignificantly altered by reduction of the palatal coverage. This finding was in agreement with responses indicating that retention during meals remained unchanged. However, several individuals reported that denture retention between meals was impaired. Three denture wearers reported that reduction of the palatal coverage influenced their sense of taste positively, and one reported that an occasional gagging tendency had disappeared. At the end of the experiment the participants were given the choice of a new conventional denture or a new denture without palatal coverage.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗
PubMed2002

[Mixed and palatal salivary secretion in denture-wearing healthy people and in patients with Sjogren syndrome].

Denture retention is related to forces necessary to completely remove the denture from its basal seat. The liquid-joint model for explaining denture retention is accepted by most of the authors. According to this model retentive force is a function of saliva surface tension, liquid film thickness, surface of contact and the liquid-denture contact angle. Based upon the literature, mucosa covered with the least amount of saliva exists at the area of the palate and the upper lip, consequently at the area of the upper denture retention. Dryness is dependent on the volume of saliva present on the oral mucous membranes and the rate of its evaporation of them. However, the hard palate contains few minor glands and it is an area of high evaporation. Based on the above mentioned facts, patients with xerostomia might have problems with the stability of the complete dentures. To verify it, authors investigated 24 healthy people and 11 patients with Sjögren's syndrome (SS). Further aim of the authors was to determine how the new dentures influence the whole resting and the palatal saliva flow rate. According to the results whole resting saliva flow rate is decreased in SS because of the focal inflammation of the salivary glands, but surprisingly the palatal secretion rate does not change in SS related to the initial values of the healthy people. Although every patient had xerostomia (WRS < or = 0.1 ml/min), none of them complained about denture instability. Based upon this study, authors agree with the statement of the literature, that palatal mucous saliva can help to stabilize the maxillary denture. Results suggest that whole resting and palatal saliva flow rates are not influenced by the placement of new dentures in healthy complete denture wearers.

Aged↗
PubMed1991

[Importance of the palatal seal for complete denture's retention].

By preserving the anatomic integrity of the stomatognathic system, a prosthesis allows its physiologic activities to proceed normally. A function imprint provides a picture of the prosthesis support and relationship between mobile tissues and prosthesis rims. A high-quality function imprint required, but current literature offers different opinions and views concerning the choice and method of taking a function imprint. Several procedures covering all methodologic differences can still be singled out: taking a function imprint without pressure, taking a function imprint with pressure, taking a function imprint with the mouth open, taking a function imprint with the mouth closed. The regions with a thin and less keratinized mucosa over the bone but without a submucosal interlayer must be relieved or imprinted without pressure. Forward inclination of the head and the position of the tongue make the soft palate to acquire a functional position on taking the imprint, thus allowing the posterior pharyngeal rim of the upper prosthesis to be determined. The greater the valve effect and the lesser the space between the prosthesis base and support, the higher the negative pressure upon the support. Imbibition is achieved by the prosthesis rims lying in the initial part of mobile mucosa, and the pharyngeal rim on the border between the hard and soft palate, in the region of the "ah" line. Retention of the prosthesis is mostly secured by its posterior, dorsal patal or pharyngeal rim. When pointing to its importance in retention, it applies to the rim margins, its relation to the support and its role in the valve closure of the upper total prosthesis.

Dental Impression Technique↗
PubMed1982

Preprosthetic management of severe alveolar ridge atrophy.

The preprosthetic management of individuals with denture instability caused by severe alveolar ridge atrophy is discussed with respect to augmentation by bone grafting or implantation of denture retention devices. Specific indications were made for the use of each surgical procedure and the clinical effectiveness of each was illustrated with a case presentation. In the maxilla and mandible, there is a range of functional alveolar ridge heights that results in unsatisfactory denture retention. If the alveolar morphology lends itself to a soft tissue procedure, a vestibuloplasty will often provide satisfactory improvement in stability. However, if the alveolar height is severely diminished, denture retention can be satisfactorily enhanced only by ridge augmentation procedures such as bone grafting or the placement of metal implants. Implantation of denture retention devices can improve denture stability on certain severely atrophic mandibular alveolar ridges. The staple is a precision appliance that must be placed during a surgical procedure under general anesthesia, requires close attention by patient and prosthodontist following placement, and is expensive. The ramus frame is a less expensive alternative that can be placed on an extremely atrophic mandible under local anesthesia with conscious sedation. The morbidity associated with harvesting autogenous iliac crest or rib for bone grafting, though it requires a general anesthetic, is relatively minimal in the healthy patient. Vigilant postoperative care and aggressive physical therapy lead to rapid rehabilitation of the individuals who must recover from the additional surgery.

Alveolar Process↗
PubMed2000

Effect of denture adhesive on retention of the mandibular and maxillary dentures during function.

The purpose of this study was to determine the effect of denture adhesive on retention of mandibular and maxillary dentures over a four-hour period. Denture movements were measured using an alternating magnetic field tracking device that determines the position of magnetic receiver coils relative to a transmitter coil positioned over the head. Ten adults with complete maxillary dentures and complete mandibular implant overdentures were enrolled in the study. Specially fabricated mandibular dentures contained a relief area that exposed the implant post which no longer anchored the denture, but now served as an attachment point for a receiver coil that measured mandibular movement. The denture coil was attached lateral to the post coil on a shelf cut into the denture. Mandibular denture movements were recorded as the difference between the mandible movement signal and the mandible + mandibular denture signals. Measurements of denture movements were made at baseline (no adhesive) and at 0, 2, 4 hours post-adhesive application with Fixodent cream for standardized chewing and biting. The MoveTrack signals were recorded on a digital data cassette recorder for subsequent computer analysis. The results of the measurements were analyzed using paired sample t-tests. Specifically, the following comparisons of movement means were made: mandibular vs. maxillary, baseline vs. post-baseline and successive changes (e.g., baseline vs. hour 0, hour 0 vs. hour 2, etc.). Results of these analyses showed that: 1) mandibular denture movements under both adhesive and non-adhesive conditions were significantly greater than maxillary denture movements; 2) the adhesive significantly reduced movement of the maxillary and mandibular dentures during both chewing and biting; and 3) the improvement occurred immediately post-application of the adhesive and was maintained for the four hours of follow-up.

Adhesives↗
PubMed1982

Preprosthetic mandibular vestibuloplasty with buccal mucosal graft. A 2-year follow-up study.

21 patients with denture retention problems due to lack of mandibular vestibular denture space and alveolar ridge atrophy had a vestibuloplasty with free grafting of check mucosa performed under local anaesthesia on an out-patient basis. Follow-up examinations based on metric records showed that 18% of the sulcus extension is lost during the first post-operative month, but regained by the time of the 6-month control, leaving 99% of the surgically created sulcus extension as a permanent gain. The grafted check mucosa served well as a denture-bearing tissue, and almost all patient had a significant improvement of denture retention and stability. Complications were few. The biology of healing is discussed in the light of recent concepts of wound healing.

Aged↗
PubMedDate not supplied

[Analysis of the most common causes of failure in complete dentures].

The most frequent failures in complete denture construction are examined. All possible failures have been taken into con- been divided into 3 groups: failures in denture retention, in interocclusal relations and factors which are reducing denture stabilization. Failures in the lower complete denture retention with poor extension have been most frequently found (90% cases). Less frequent was poor extension of the upper complete denture. Disbalance such as excentric occlusion and articulation blocking have been frequently found. A sizable vertical occlusal dimension was also significant.

Dental Occlusion↗
PubMed2006

Factors associated with oral health-related quality of life in institutionalized elderly.

OBJECTIVE: The aim of this study was to investigate factors associated with the oral health-related quality of life (OHRQoL) of institutionalized elderly in Germany. MATERIAL AND METHODS: One-hundred-and-fifty-eight subjects from old people's homes were selected (mean 82.8 years). OHRQoL was measured using the Oral Health Impact Profile (OHIP). Denture characteristics (kind and age of denture, retention of removable denture, number of teeth in static occlusion) and general issues (age, gender, education level, and general pain status) were assessed. All factors were subjected to bivariate testing for their effects on the OHIP summary score (OHIP-SC) and to multivariate testing in subjects with removable dentures (n = 128); a linear regression model with backward elimination was used, with OHIP-SC as the dependent variable. RESULTS: In the context of other studies, a median OHIP-SC of 29 indicated highly impaired OHRQoL. According to the bivariate analysis, retention, age of denture, number of teeth in static occlusion, general pain status, and education all exhibited significant influence on OHIP-SC. In the final linear regression model, general pain status, education level, and retention of denture remained at a statistically significant level. The model explained 34% (R2 = 0.34) of the variance of the OHIP-SC. The kind of denture had no significant impact on OHIP-SC. CONCLUSIONS: In contrast to other groups, the kind of denture exhibited little impact on OHIP-SC for this highly specific collective. However, there were functional aspects of dentures which seemed to be important. Non-dental factors had a striking effect on OHRQoL.

Aged↗
PubMed1990

Retention of denture adhesives--an in vitro study.

Denture adhesives are being used by patients to aid the retention and stability of their dentures. A number of laboratory and clinical investigations have been conducted to study the effects of such adhesives. This study describes a simple in vitro method for measurement of their retentive effect and its relation to loss of adhesive. The results show that there is a reduction in the effectiveness of adhesives, and that there is also an increase in adhesive loss, with time. There appears to be a correlation between these two properties.

Adhesiveness↗