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At least 1,747 records · Page 97Linked to original sources
PubMed2006

Fabrication of an overdenture covering a torus palatinus using a combination of denture base materials: a case report.

A maxillary torus provides a challenge when restoring an edentulous arch. Tori tend to have very thin mucosa and can be intolerant of normal pressures from a denture base. The tori tend to have large undercuts and at times extend to the junction with the soft palate, preventing the creation of a good palatal seal. Triple lamination involves combining 3 materials to fabricate a denture base that utilizes the retentive aspects of the torus. The thermoplastic flange provides a measure of flexibility, allowing the denture to seat over the torus. The resilient liner provides a cushion to diffuse the occlusal load, while the rigid acrylic base provides the support for the denture teeth. Using this approach, a very retentive denture was fabricated using the maxillary torus as a key element in anchoring the prosthesis.

Acrylic Resins↗
PubMed1997

Implant supported overdentures--the King's experience.

OBJECTIVES: Astra Tech implants have been used to provide implant supported overdentures for 25 people, 13 with paired stud retention, 10 with paired magnetic retention and two with magnetic retention on three fixtures. RESULTS: The first case was completed in June 1990 and the last in May 1992. Of the 52 fixtures which were used initially, one became loose after 6 months and one fractured after 12 months. Healing following Stage I surgery was classified as good for 14 people, moderate for eight and poor for three. Healing following Stage II surgery was problem-free in 14 people, with problems encountered in 11 people in six of whom the problem was caused by selecting healing abutments which were too short. There were 58 events of post-insertion care for the magnet group, which resulted in 104 visits and 60 events of post-insertion care for the stud group, which resulted in 89 visits. The need for post-insertion care was greatest during the first year with the magnet group having 33 events and the stud group 36 events. Twenty four of the participants rated treatment success as good and one as moderate. CONCLUSIONS: Implant supported overdentures in the mandible using two isolated abutments are a successful treatment option by they can be demanding in continuing care.

Adult↗
PubMed1999

New telescopic crown design for removable partial dentures.

STATEMENT OF PROBLEM: Special technical skills and experiences are required to fabricate a telescopic crown to provide adequate retention with precise frictional retention ("conus friction force") between coping and telescope. It is also difficult to control clinically alterations of retentive forces after prolonged usage. PURPOSE: This study examined an innovative telescopic crown system for removable partial dentures that can be fabricated without special technical skill or experience and readily adjusted retentive forces. The retention of telescopic crowns was investigated after repeated insertion/separation tests. MATERIAL AND METHODS: Ten telescopic crowns were constructed to evaluate retentive forces. Each telescopic crown was adjusted to provide a retentive force of approximately 9.8 N. Each telescopic crown was then subjected to 10,000 insertion/separation cycles, and retentive force of each telescopic crown was recorded initially and after every 1,000 cycles. The retentive force of each telescopic crown was re-adjusted after these measurements to provide a retentive force of approximately 9.8 N. The retentive force was recorded a second time after each 1,000 insertion/separation cycles up to 10,000 cycles. RESULTS: Retention of the telescopic crowns gradually diminished, depending on the number of insertion/separation cycles. The mean retentive force after 10,000 insertion/separation cycles was over 2 N. All 10 telescopic crowns were re-adjusted to exert a retentive force of 9.8 N after the initial 10,000 cycles, and the retentive force also diminished on the second 10,000 cycles. CONCLUSIONS: Reduction of retention was dependent on insertion/separation cycles. This new telescopic crown with reduced retention could be easily readjusted. Readjusted retentive forces were at least equivalent to the initial retention.

Analysis of Variance↗
PubMedDate not supplied

Patient satisfaction with mandibular implant overdentures and conventional dentures 6 months after delivery.

PURPOSE: This study examined patient satisfaction with conventional complete dentures and mandibular implant overdentures opposing conventional maxillary dentures 6 months after delivery. MATERIALS AND METHODS: Sixty edentulous subjects (aged 65 to 75 years) were randomly assigned to either a mandibular conventional denture or an overdenture supported by two implants with ball-shaped retentive anchors. Patients rated their general satisfaction and other features of their prostheses, together with their ability to eat certain food items, on 100-mm visual analogue scales before assignment, and after 2 and 6 months. RESULTS: Both treatment groups reported greater satisfaction with their new prostheses at 6 months. General satisfaction ratings were higher in the implant group than in the conventional denture group by approximately 36% (mean difference 22.3 mm). The implant group also rated comfort (mean difference 22.4 mm), stability (mean difference 28.5 mm), and ability to chew (mean difference 17.3 mm) significantly higher. Significantly higher scores were also given by the implant group for their ability to chew certain hard foods. A trend for an increase in the differences between the groups, in favor of the implant group, was observed between the 2- and 6-month recalls, although the increase was only significant for ease of cleaning. The primary influence on general satisfaction 6 months after the delivery of the prostheses was the provision of the two-implant overdenture. CONCLUSION: Edentulous seniors who received mandibular implant overdentures opposing a conventional denture rated their general satisfaction approximately 36% higher than did a comparable group provided with new conventional dentures.

Aged↗
PubMed2006

Stability and marginal bone level measurements of unsplinted implants used for mandibular overdentures: a 1-year randomized prospective clinical study comparing early and conventional loading protocols.

OBJECTIVES: The aim of this study was to compare the performance of two non-splinted implants used as retention for a mandibular overdenture when applying conventional or early loading protocols. MATERIAL AND METHODS: Twenty edentulous patients were treated with two unsplinted and non-submerged implants (15 mm long, TiUnite RP, Brånemark System) in the anterior mandible. The patients were randomly allotted into two groups: (i) test group (Group A), in which the overdenture was connected 1 week after surgery, and (ii) control group (Group B), in which the overdenture was connected after 12 weeks of healing. Resonance frequency analyses (RFA) for implant stability measurements were performed at implant surgery and after 1, 3, 6, 9 and 12 months. Marginal bone levels were evaluated at implant surgery and after 6 and 12 months. RESULTS: No implant from either group was lost and all implants showed less than 1 mm of marginal bone resorption during the first year. The mean implant stability quotient (ISQ) values at implant surgery were 76.2+/-2.8 for Group A and 75.6+/-4.5 for Group B. The 12-month measurements showed 76.4+/-2.5 ISQ and 76.4+/-2.8 ISQ for Groups A and B, respectively. There were no statistically significant changes between or within the groups with time. There were no differences in marginal bone loss, which was on average 0.3 mm for both groups after 1 year. CONCLUSION: Although a limited number of patients were followed for 1 year only, the results of the present study indicate that early loading of two unsplinted 15 mm long implants with an overdenture does not negatively affect implant stability or marginal bone conditions when compared with implants subjected to 12 weeks of healing before loading.

Aged↗