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PubMed1992

Age and maintenance of removable dentures in Finland.

The age and maintenance of dentures, and denture-cleaning habits, were studied by an interview survey. The material represented nation-wide the Finnish population aged greater than or equal to 15 years old, and there were 957 interviewees, of whom 328 were denture wearers. In total, 45% of the upper and 40% of the lower dentures were over 10 years old. More than one-third of the dentures more than 5 years old had never been maintained during that time. Individuals whose dentures had been made and fitted by dental technicians visited dentists less frequently than individuals whose dentures had been made by dentists. Over 80% of the denture wearers reported cleaning their dentures by brushing at least once a day, and women cleaned them more frequently than men. The present findings suggest that denture wearers should be a special target group for dental health education, for the development of the latter, and for the development of dental health care services in the future.

Adolescent↗
PubMed1993

Adding retentive features in the rebonding of cast metal resin-bonded prostheses.

Many methods have been used to improve retention in resin-retained fixed prostheses, such as electrolytic etching of the retainer, the labial wrap design, proximal grooves, cast pin retention, and the use of improved adhesive resins such as Panavia EX (Kuraray Co, Osaka, Japan). Insufficient retentive features often lead to debonding of resin-retained fixed prostheses. Debonded prostheses may occasionally be recemented and successfully retained by the addition of retentive features to the prosthesis and abutment teeth. When recementing a debonded prosthesis with questionable retention, additional retention may be added to the retentive wings of the prosthesis by using a Rochette retentive hole in combination with pin retention or enamel/dentinal slots in the abutment teeth.

Dental Pins↗
PubMed2006

Survival and complication rates of combined tooth-implant-supported fixed partial dentures.

OBJECTIVES: The objective of this study has been to review the incidence of biological and technical complications in case of tooth-implant-supported fixed partial denture (FPD) treatments on the basis of survival data regarding clinical cases. MATERIAL AND METHODS: Based on the treatment documentations of a Bundeswehr dental clinic (Cologne-Wahn German Air Force Garrison), the medical charts of 83 patients with tooth-implant-supported FPDs were completely recorded. The median follow-up time was 4.73 (time range: 2.2-8.3) years. In the process, survival curves according to Kaplan and Meier were applied in addition to frequency counts. RESULTS: A total of 84 tooth-implant (83 patients) connected prostheses were followed (132 abutment teeth, 142 implant abutments (Branemark, Straumann). FPDs: the time-dependent illustration reveals that after 5 years, as many as 10% of the tooth-implant-supported FPDs already had to be subjected to a technical modification (renewal (n=2), reintegration (n=4), veneer fracture (n=5), fracture of frame (n=2)). In contrast to non-rigid connection of teeth and implants, technical modification measures were rarely required in case of tooth-implant-supported FPDs with a rigid connection. There was no statistical difference between technical complications and the used implant system. Abutment teeth and implants: during the observation period, none of the functionally loaded implants (n=142) had to be removed. Three of the overall 132 abutment teeth were lost because of periodontal inflammation. The time-dependent illustration reveals, that after 5 years as many as 8% of the abutment teeth already required corresponding therapeutic measures (periodontal treatment (5%), filling therapy (2.5%), endodontic treatment (0.5%)). After as few as 3 years, the connection related complications of implant abutments (abutment or occlusal screw loosening, loss of cementation) already had to be corrected in approximately 8% of the cases. In the utilization period there was no screw or abutment fracture. CONCLUSION: Technical complications of implant-supported FPDs are dependent on the different bridge configurations. When using rigid functional connections, similarly favourable values will be achieved as in case of solely implant-supported FPDs. In this study other characteristics like different fixation systems (screwed vs. cemented) or various implant systems had no significant effect to the rate of technical complications.

Adult↗
PubMed2001

Developing a schedule of normative denture treatment need.

OBJECTIVES: The aim of the study is to assess the reliability and validity of a schedule to determine the normative denture treatment needs of older people. DESIGN: The design used assessed inter-examiner reliability (criterion validity), test-retest reliability, and content and face validity of the schedule. SETTING: The inter-examiner reliability study took place in a Department of Prosthetic Dentistry, the remainder of the work took place in a community setting. RESULTS: The results showed that the schedule in terms of an index performed well with reasonable inter-examiner and test-retest reliability. Difficulties however were encountered with regard to subjective judgements about denture quality and design; consequently, there was modest inter-examiner agreement for stability, retention, and occlusal balance. CONCLUSIONS: The findings from this preliminary work suggest that the schedule may be useful in the assessment of normative denture treatment need in a community setting. Nevertheless more work will be required to obtain further information on the validity of this new assessment measure.

Age Factors↗
PubMed1980

The dental application of electroformed pure gold. II. A. Porcelain inlay. B. Cast copings with adaptable electroformed gold margins.

A technique for electroforming pure gold margins on the abutment castings of bridge substructures made from gold alloys or base metals alloys has been described. The margin of gold can be burnished to compensate for errors inherent in the production of these castings and ceramic procedures. A modification of this procedure permits marginal adjustment to completed crowns and bridges with deficient margins.

Crowns↗
PubMed1995

Rehabilitation of the edentulous mandible with osseointegrated dental implants: 10 year follow-up.

Long-term retrospective studies on the efficacy of implant retained bridgework are relatively few. In this study, 10 year follow-up results are reported on the rehabilitation of the edentulous mandible with osseointegrated implant anchored bridges. Fifteen patients were closely maintained and monitored using the conventional indices used in longitudinal periodontal research, together with serial intraoral periapical and extraoral panoramic radiographs. The need for prosthetic maintenance and the effects of the treatment on soft tissues, supporting bone, opposing dentition and the behavioural aspects of such rehabilitation are discussed. Based on the reviewed results of the study and numerous other investigations, the treatment of mandibular edentulism with fixed bridges supported by osseointegrated implants ad modum Brånemark is a highly effective method, giving predictable long-term results.

Adult↗
PubMed1996

Removable prosthodontics: a survey of practices and attitudes among South Australian dentists.

All dentists registered in South Australia were surveyed in July 1993 in relation to removable prosthodontics. The replies indicated that removable prosthodontics constituted a significant part of most dental practices. Most dentists felt that removable prosthodontics should be an essential part of the undergraduate curriculum. They felt that more expertise is now required to manage the treatment of the ageing population with either their first or replacement removable prostheses. The majority of dentists felt that their own undergraduate training had equipped them well to manage removable prosthodontic treatment for their patients; however, many helpful suggestions were made on areas that they thought required more emphasis.

Adult↗
PubMed2000

A prospective study of cantilever resin-bonded bridges: an initial report.

A prospective study was undertaken in a dental teaching hospital to compare the clinical performance of cantilever resin-bonded bridges with a fixed-fixed design for the replacement of a maxillary permanent incisor. A total of 25 anterior resin-bonded bridges was placed in 24 patients. The prostheses were evaluated over 14 to 45 months. During the evaluation period only one fixed-fixed type debonded, which was subsequently rebonded successfully. There was no debond in the cantilever group. The short-term, initial findings showed that cantilever resin-bonded bridges performed as successfully as their fixed-fixed counterparts and were considered to be an acceptable form of restoration.

Adolescent↗
PubMed1993

Analysis of debond rates of resin-bonded prostheses.

Debonding rates of 164 resin-bonded prostheses (RBP) placed from 1974 to 1985 were examined at recall. The yearly debond rates were calculated, the cumulative probability of failure was determined for the debonded RBPs, and Weibull distribution parameters were determined. For perforated prostheses, there was a high initial debond rate, followed by slowly decreasing rates for about 5 years. Increasing rates after 5 years indicated the beginning of wear-out. The Weibull parameters for the wear-out period of the perforated prostheses were: characteristic life = 128 (SE = 2) months, modulus = 1.27 (0.06), and threshold parameter = 0. Data were available for etched frameworks for 6 years and showed decreasing debond rates during this time. The characteristic life of the etched bridges was 318 (84) months. The cumulative failure data were also modeled with a cubic polynomial distribution that resulted in a U-shaped hazard function.

Adolescent↗
PubMed1998

A five-year multi-practice clinical study on posterior resin-bonded bridges.

Previous clinical observations have revealed that resin-bonded bridges for posterior tooth replacements are less retentive than anterior resin-bonded bridges. Improved bonding procedures and preparation designs, however, may have a positive effect on the functional durability of these restorations. The present study reports the final analysis of a randomized controlled clinical trial in which different designs of posterior resin-bonded bridges were evaluated for a period of at least 5 years. The operational hypothesis was that the bonding system and the preparation design used in posterior resin-bonded bridges have an influence on the survival and clinical functioning of these restorations. Survival in this study was defined at two levels: (1) 'complete' survival (survival without any debonding), and (2) 'functional' survival (survival including loss of retention on one occasion and successful rebonding of the original RBB without further debonding). With regard to 'complete' survival, no significant differences were found between the bonding systems used for adherence of the restorations to abutment teeth (etching/Clearfil F2, sandblasting/Panavia EX, and silica-coating/Microfill Pontic C). The variable 'preparation form' (conventional preparation form vs. modified preparation form) for complete survival was statistically in favor of the modified preparation form (62% vs. 46%), but did not influence the functional survival. With regard to 'functional' survival, the combination of silica coating and Microfill Pontic C was more retentive than the other bonding systems (90% survival vs. 72% and 75%, p < 0.01). Factor location was found to be highly significant for both survival levels [Cox's PH model, p = 0.0002 (Cox, 1972)]: The five-year 'complete' survival rates were 65% for maxillary restorations and 40% for mandibular restorations, while the five-year 'functional' survival rates were 89% and 68%, respectively. It is concluded that preparation of grooves in abutment teeth for posterior resin-bonded bridges is beneficial to their chance of survival. Resin-bonded bridges placed in the maxilla have a better prognosis than those made in the mandible. The bonding systems used in this study appear to have no influence on the chance of failure. In rebonded posterior resin-bonded bridges, the bonding system silica-coating/Microfill Pontic C was more retentive than the other systems tested.

Acid Etching, Dental↗
PubMed2002

Implant complications and failures: the fixed prosthesis.

The implant-retained fixed prosthesis has been advocated as an effective restoration offering significant benefits over conventional prosthetics. The success of treatment depends on careful pre-surgical planning and prosthesis design. This paper outlines some common complications encountered during the planning, fabrication and maintenance of both large and small fixed prostheses and suggests how these complications can be minimized.

Bite Force↗
PubMed1995

Using the existing prosthesis as a provisional restoration.

The remaking of a fixed prosthesis provides a unique opportunity of converting the existing prosthesis to a provisional restoration for use while a replacement is being made. This article describes a technique for using existing prostheses that offers several advantages: less potential wear, increased provisional strength and retention, decreased clinical time and esthetically acceptable contours.

Dental Caries↗
PubMed2006

The Carolina bridge: a novel interim all-porcelain bonded prosthesis.

UNLABELLED: Numerous bonded bridge designs have been advocated over the years for the temporary or permanent replacement of missing teeth. Both metal and all-porcelain designs of bonded bridges have been advocated, with varying degrees of success. However, all of these designs involve some degree of tooth preparation, making them irreversible in nature. The Carolina bridge, a novel all-porcelain bonded pontic, requires no significant tooth preparation, making it an outstanding option as an interim prosthesis. The key to success is the availability of adequate surface area interproximally to ensure optimally strong resin composite connectors. CLINICAL SIGNIFICANCE: This article describes the indications, contraindications, and clinical technique for the placement of an ultraconservative all-porcelain bonded bridge for the interim replacement of single incisors.

Composite Resins↗