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Results for “Denture Retention”

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At least 109 records · Page 6Linked to original sources
PubMed1984

Retention of complete maxillary dentures measured as resistance against unilateral occlusal loading.

Complete maxillary dentures were tested for their ability to remain in place when subjected to unilateral occlusal loads. The test material comprised five persons, each supplied with three identical dentures. The denture design was based on the principles of 1) functionally determined filling-in of the vestibular sulcus, 2) palatal coverage to the vibration line without post dam, 3) aesthetically governed positioning of the front teeth, and 4) positioning of the lateral teeth in the plane connecting the top of the residual ridge with the central part of the occlusal surface of the antagonizing natural teeth. Resistance to unilateral occlusal loads was measured by means of a miniature bite force sensor. In the pooled material, an average load of 70 N was tolerated before the dentures were dislodged. For a given participant/denture combination, the resistance against dislodgment varied considerably when tested on different days. Marked differences were also found among three identical dentures in one person. The tolerance against unilateral occlusal loads could feasibly be quantified. However, the influence of specific clinical and/or technological factors on denture retention during function should be studied only if strict definitions as to the test conditions are given. These conditions must include the time, person, and denture tested.

Aged↗
PubMed1978

The role of saliva in retention of maxillary complete dentures.

In this study maxillary denture retention was influenced by the salivary volume between the denture base and the mucous membrane. An optimum intervening salivary volume, at which the greatest retention was developed, was also observed. It was observed from determination of electric resistance of palatal mucous membrane that inward and outward flow of intervening saliva was greater in the denture with poor retention than in the one with good retention. Moreover, when the salivary volume between the denture base and mucous membrane was optimum the salivary flow under the denture was minimum.

Adult↗
PubMedDate not supplied

Correlation between patient satisfaction with complete dentures and denture quality, oral condition, and flow rate of submandibular/sublingual salivary glands.

PURPOSE: The purpose of this study was to examine the correlation between patient satisfaction with complete dentures and parameters of denture quality, oral condition, and flow rate of the submandibular and sublingual salivary glands. MATERIALS AND METHODS: The parameters were evaluated on 50 denture wearers using semiquantitative scales and a recently described submandibular/sublingual saliva collector. RESULTS: Most patients had a medication-induced reduced salivary flow rate (mean 0.024 mL/min/gland; SD 0.040). Submandibular/sublingual salivary flow rate correlated statistically with six denture satisfaction parameters: maxillary denture retention and comfort, mandibular denture retention and comfort, abilities of chewing, and speech. Residual alveolar ridge resilience, maxillary ridge shape, and denture quality did not significantly correlate with denture satisfaction. Characteristics of musculature correlated significantly only with subjective maxillary denture retention, and mandibular ridge shape correlated with comfort. CONCLUSION: Submandibular/sublingual salivary flow rate is an important factor in denture satisfaction. The retention of the maxillary denture was correlated to the oral musculature characteristics, and the mandibular denture comfort was correlated to the mandibular ridge shape. Denture satisfaction was not affected by other anatomic or denture quality-related parameters.

Aged↗
PubMed2002

Interventions for replacing missing teeth: preprosthetic surgery versus dental implants.

BACKGROUND: Preprosthetic surgery refers to the surgical procedures that can modify the oral anatomy to facilitate the retention of conventional dentures. Osseointegrated implants offer an alternative treatment to improve denture retention. A denture may be connected by special attachments to implants placed into the jaw. OBJECTIVES: To test the null hypothesis of no difference in the success (patient satisfaction and morbidity) and cost effectiveness between conventional prostheses that require preprosthetic surgery (PPS) and implant retained prostheses (IRO) that do not require preprosthetic surgery, against the alternative hypothesis of a difference. SEARCH STRATEGY: The Cochrane Oral Health Group (OHG) Specialised Register (May 2002), the Cochrane Controlled Trials Register (Issue 2, 2002), MEDLINE and EMBASE (May 2002) were searched. In addition, 55 implant companies were contacted and the bibliographies of review articles were checked for studies outside the hand searched journals and personal references were searched. SELECTION CRITERIA: Randomised controlled trials comparing preprosthetic surgery and implant retained dentures for improving denture retention. DATA COLLECTION AND ANALYSIS: Data were independently extracted, in duplicate, by two reviewers (HW, PC). Authors were contacted for details of randomisation and withdrawals and a quality assessment was carried out (ME, PC). The Cochrane OHG's statistical guidelines were followed. MAIN RESULTS: One study, containing 60 participants, reported in four articles was identified for inclusion in this review. No studies were excluded. There was a statistically significant difference between mean patient satisfaction scores with patients in the IRO group being more satisfied in general at both year one (WMD = -0.66(95% CI; -1.28 to -0.04)) and five years (WMD = -0.90(95%CI; -1.74 to -0.06). Altered sensation of the lower lip and chin was measured at one year and five years. There was no statistically significant difference at either time point and no patients had altered sensation at five years. REVIEWER'S CONCLUSIONS: There is weak evidence from the results of one randomised controlled trial including 60 subjects that patients are generally less satisfied with preprosthetic surgery and a conventional denture than with an implant retained denture. There is a need for more well designed trials comparing the success and cost-effectiveness of preprosthetic surgery and implant supported dentures. Such trials should be reported according to the CONSORT guidelines (http://www.consort-statement.org/). However, since preprosthetic surgery is considered to be an obsolete treatment nowadays, almost completely replaced by dental implants, it may be that new RCTs on this topic will not be designed.

Dental Implantation↗
PubMedDate not supplied

Designing clasps for the asymmetric distal extension removable partial denture.

Retentive clasp components can be created to minimize torquing forces on abutment teeth incorporated in the support and retention of bilateral distal extension removable partial dentures. Functional movement of the combined tooth-mucosa-borne prosthesis about the axis of rotation necessitates consideration of retentive element design modifications, particularly as they relate to bilateral asymmetric distal extension situations.

Dental Abutments↗
PubMed2003

Comparison between balanced occlusion and canine guidance in complete denture wearers--a clinical, randomized trial.

OBJECTIVE: Two occlusal concepts exist for the setup of complete dentures: canine guidance and balanced occlusion. These two schemes were studied in a randomized clinical trial of 22 patients. METHOD AND MATERIALS: Subjective data were collected using a visual analog scale that described the patients' satisfaction with the esthetic appearance, the ability to chew, the ability to speak, and denture retention. Objective data were collected on the number of denture ulcers, the number of occlusal contacts, and denture retention during eccentric movements. Statistic evaluation was performed with the Friedman test. RESULTS: Patients assessed canine-guided dentures to be significantly more satisfying in esthetic appearance, mandibular denture retention, and chewing ability. The ability to speak and the retention of maxillary dentures were not influenced by the occlusal concept in the patients' opinion, whereas the examiners found that maxillary canine-guided dentures lost retention more frequently during eccentric movements than balanced dentures. The objective inspection of mandibular denture retention underscores the patients' assessment, showing that the mandibular canine-guided dentures are much more stable during laterotrusive and protrusive movements. CONCLUSION: Canine guidance can be used successfully in complete denture treatment as it provides better mandibular denture retention, esthetic appearance, and chewing ability.

Aged↗
PubMed2001

Hamular frenum modification: a removable denture prosthesis retention and stability enhancement.

A removable denture prosthesis, whether partial or complete, often requires preprosthetic surgery to achieve optimum stabilization and retention. While the hamular frenum may produce significant dynamic dislodging forces, a literature review did not reveal any reports dealing with this problem. A hamular frenum reduction surgical procedure using the free autogenous gingival graft procedure is described. Prosthetic function may be enhanced by eliminating the dynamic disrupting force of the hamular frenum along with improving posterior maxillary tuberosity contour and, as necessary, premaxillary form, allowing these contours to work in concert to develop a "cupping" stabilizing and retentive complex.

Aged↗
PubMed2001

Wettability of denture materials.

OBJECTIVE: To promote denture retention and denture comfort, denture materials should possess adequate wettability. This in vitro study investigated the wettability of nine commercially available dental materials. METHOD AND MATERIALS: Four denture base materials, two denture hard lining materials, and three denture soft lining materials (with and without varnish treatment) were tested. The wettability measurements were made using the dynamic contact angle analysis technique. The equilibrium and hysteresis angles obtained were used for the comparisons. RESULTS: The equilibrium contact angle (thetae) ranged from 63.9 (Permaflex + varnish) to 81.0 degrees (Mollosil + varnish). The differences observed among the materials tested were statistically significant. The contact angle hysteresis ranged from 16.0 (SR 3/60 Triplex) to 51.2 degrees (Mollosil), and there was a statistically significant difference among the materials. CONCLUSION: The heat-polymerized soft lining materials exhibited the greatest equilibrium contact angle, the autopolymerized soft liner had the lowest value, and the denture base materials had intermediate values. The soft liners showed greater contact angle hysteresis than all other materials. The use of varnish altered the wetting characteristics.

Algorithms↗