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PubMedDate not supplied

Swing-lock removable partial dentures.

The swing-lock removable partial denture (RPD) is a little-taught RPD concept that offers clinicians additional choices in the treatment of perplexing situations involving periodontally compromised dentitions, missing key abutments, and other clinical situations in which a conventional RPD design may not be feasible. This article reviews past and current literature concerning the swing-lock RPD and provides some clinical and laboratory considerations involving the treatment planning and fabrication of this often-useful RPD.

Contraindications↗
PubMedDate not supplied

A 20-year retrospective survival study of fixed partial dentures.

PURPOSE: This study of fixed partial dentures (FPDs) evaluated the long-term efficacy and determined frequencies and causes of failures. MATERIALS AND METHODS: A total of 322 FPDs in 193 patients, fabricated at an undergraduate university clinic, were evaluated over a 20-year period. All patients were invited to participate in a supportive maintenance program. Failures of the FPDs were divided into irreversible complications (loss of FPD/abutment) and reversible complications (FPD intact after conservative treatment) and into biologic and technical/patient-related failures. RESULTS: The Kaplan-Meier survival rate after 20 years was 66.2%. Statistically significant differences in survival rates were found between FPDs without post-and-core abutment teeth as compared to FPDs with at least one post-and-core abutment tooth (P = .002) and for vital abutments versus post-and-core abutments (P = .001), but significant differences were not found between restorations in the maxilla and mandible (P = .27). Caries and loss of retention were the main reasons for failure and accounted for 61% of the failures. CONCLUSION: The survival of FPDs by undergraduate students at a university clinic during a 20-year period was comparable to the results published by university departments or general practitioners. Occurrence of a previously reversible complication is a predictive factor for an irreversible complication later on. A reversible complication within the first 2 years will probably lead to an early irreversible complication.

Adult↗
PubMed1997

An alternative altered cast technique for a distal extension removable partial denture.

The use of a removable partial denture to restore the posterior edentulous space continues to be a viable treatment option for patients who are not candidates for cantilevered fixed prostheses or dental implants because of the nature of the remaining teeth and bony support, the anatomy of the residual ridges, or financial constraints. The purpose of this paper is to introduce an alternative technique for the fabrication of a well-fitting distal extension RPD that will take maximum advantage of the dual nature of the support provided by the teeth and the resilient tissues of the residual ridge.

Acrylic Resins↗
PubMed2000

Design principles for cantilevered resin-bonded fixed partial dentures.

Recent clinical studies show 2-unit cantilevered resin-bonded fixed partial dentures to be as retentive or more retentive than their fixed-fixed counterparts. The fact that the 2-unit prosthesis is successful adds value to the clinical use of resin-bonded fixed partial dentures because the single-abutment prosthesis is even simpler and more cost effective than fixed-fixed designs. However, there is no evidence-based information relating to design principles for abutment preparation and framework design for the single-abutment, single-retainer prosthesis. The aim of this report is to suggest principles of design for the 2-unit cantilevered fixed partial denture, based on information gained from studies on fixed-fixed designs.

Cost-Benefit Analysis↗
PubMed2002

Direct and indirect fiber-reinforced fixed partial dentures: case reports.

Direct and indirect fiber-reinforced resin composite fixed partial dentures are a new way to produce minimally invasive, esthetic, and cost-effective metal-free tooth replacements. These treatment alternatives have a number of indications, for example, chairside tooth replacements, long-term provisional fixed partial dentures, economically feasible tooth replacements for patients who cannot afford more traditional treatment regimens, and tooth replacements for medically compromised patients who are unable to withstand the physical stress associated with fabrication of traditional fixed prostheses. This article presents four typical cases in which fiber-reinforced fixed partial dentures seemed to be the preferable treatment modality.

Acid Etching, Dental↗
PubMed2004

Use of carbon-epoxy frameworks for reinforcing provisional fixed partial dentures.

This article describes a technique for reinforcing provisional fixed partial dentures. Solid carbon-epoxy rods were shaped and coated with opaque resin to strengthen them for PMMA restorations of 3 or more units with at least 1 pontic. Because of the rigid nature of the prepolymerized carbon-epoxy material, only straight fixed partial dentures can be fabricated with this technique that allows for simplified fabrication of reinforced metal-free and cost-effective restorations.

Carbon↗
PubMed2004

Biomechanics of cantilever fixed partial dentures in shortened dental arch therapy.

PURPOSE: The purpose of the present study was to investigate, by means of 3-dimensional finite element analysis, aspects of the biomechanics of cantilever fixed partial dentures replacing the maxillary canine in shortened dental arch therapy. The null hypothesis was that no differences would be identified by finite element analysis in the mechanical behavior of the 2 designs of cantilever fixed partial denture under different scenarios of occlusal loading. MATERIALS AND METHODS: Single- and double-abutted cantilever fixed partial dentures were modeled and analyzed using the finite element packages PATRAN and ABAQUS. Displacement and maximum principal stresses (magnitude and location) within the fixed partial dentures, supporting structures, and the periodontal ligament/bone and abutment/retainer interfaces were examined under 20 different scenarios of axial and lateral occlusal loading. RESULTS: The results indicate that more displacement occurred in the 2 rather than the 3-unit cantilever fixed partial denture, with the greatest displacement having occurred under lateral loading. The maximum principal stresses observed in the periodontal ligament/bone interfaces were greatest buccocervically, with the highest value being observed in the 2-unit fixed partial denture under lateral loading. The highest maximum principal stresses observed in the retainer/abutment interfaces were located cervically in relation to the distal margin of the retainer of the 2-unit fixed partial denture under axial loading. CONCLUSIONS: It was concluded that in adopting a cantilever fixed partial denture approach for the replacement of a missing maxillary canine in shortened dental arch therapy, there may be merits, in terms of mechanical behavior, in selecting a double-rather than a single-abutment design. Furthermore, prostheses' displacement and functional stresses may be minimized by reducing lateral loading and avoiding pontic only loading.

Biomechanical Phenomena↗
PubMed1994

Removable partial dentures without rests.

Ever since Bonwill recommended the use of rests on removable partial dentures in 1899, rests have been universally considered inviolate and have gone unchallenged and untested. The author claims that removable partial dentures without rests may not cause the adverse conditions usually predicted, such as gingival stripping, gingival inflammation, mutilated residual ridges, or extensive and rapid resorption of the alveolar ridges. In removable partial dentures made by the author for several patients, the residual ridge remained stable and in physiologic equilibrium when rests were not used. A history of the long-term effect on patients wearing partial dentures with and without rests is presented.

Adult↗
PubMed2000

The satisfaction with the removable partial denture therapy in the Croatian adult population.

Little is known about the outcomes of treatment and patient's satisfaction with removable partial dentures in adult Croatian population. Therefore patient's satisfaction with their partial dentures in relation to some socio-economic variables was studied. Patient's satisfaction with denture retention, speech, aesthetics, comfort of wearing dentures, chewing ability was also studied in relation to different denture classification, construction, material, denture base shape (major connectors), denture support and the number of missing teeth. A total of 165 patients, 59 males and 105 females between 38 and 87 years took part in this study. A questionnaire, devised for a purpose of the study, was divided into three parts. In the first part, patients answered questions about age, gender, marital status, education, general health, socio-economic status, self-supporting life, period of tooth loss and number of previous denture experiences and in the second part, patients graded their partial dentures, depending on the level of satisfaction, by using a scale from 1 to 5. In the third part a dentist determined Kennedy classification and their modifications, denture material and denture support, denture base shape and the number of missing teeth and graded a denture construction. Influence of these factors on patient's satisfaction was analyzed. A majority of the examined patients were satisfied with the partial prosthesis, but a small amount of dissatisfaction existed. More then half of them scored all the examined parameters to the best score category. Considering chewing with lower partial dentures, women were more satisfied than men (p < 0.05). Patients with more missing teeth gave lower grades for the comfort of wearing dentures (p < 0.05). Patients of higher education gave lower grades (p < 0.05) for the aesthetics. Patients were not satisfied with speech if the dentist graded a construction of a lower partial denture low (p < 0.05). Dissatisfaction was related to mastication, aesthetics, number of missing teeth and ability of speech. These findings can aid a clinician in discussing a treatment plan and help a patient understand the risk of dissatisfaction in the presence of certain factors.

Adult↗
PubMed1979

Measurement of distortions in fixed partial dentures resulting from degassing.

1. During the degassing phase, fixed partial dentures removed immediately when the temperature reached 1,900 degrees F (1,038 degrees C) with soldered connectors do not distort more than those with cast connectors. While not tested, heat-soaking could be expected to cause a greater amount of distortion, especially for fixed and supported partial dentures having soldered connectors. 2. Use of custom-made sagger trays giving support to long-span fixed partial dentures at the ends and within the span is desirable for both degassing and porcelain firing, regardless of whether or not the connectors are cast or soldered. 3. The accumulative amount of possible distortion resulting from soldering, degassing, and porcelain firing may be clinically significant if precautions are not affected.

Dental Instruments↗
PubMed1977

The effect of partial dentures and chlorhexidine gluconate gel on plaque accumulation in the absence of oral hygiene.

A study was made of the effect of wearing partial dentures upon plaque accumulation in a group of 24 partial denture wearers, when oral hygiene procedures were withdrawn. The modifying effect of a 1% chlorhexidine gluconate gel on this plaque accumulation was measured. Plaque accumulation was measured at the end of four different denture-wearing regimens each 3 days in length. The wearing of a partial denture either day only or day and night, significantly increased plaque accumulation over not wearing a denture. There was no significant difference between plaque accumulation with day wear and day and night wear. The increase in plaque accumulation with day and night wear resulted from an equal and significant increase in both buccal and lingual plaque accumulation. Chlorhexidine gluconate in the form of a gel significantly reduced plaque accumulation during daytime wear. These results tend to confirm that plaque control is a major factor in determining the long-term effects of partial dentures upon the periodontal structures and emphasize the importance of oral hygiene in partial denture wearers.

Adult↗
PubMed1981

Swinglock removable partial dentures: where and when.

The where and when of swinglock removable partial denture treatment planning have been presented, including indications, contraindications, and advantages. While the principles asserted in this article do not represent a panacea to partial denture design, the swinglock design concept does provide another treatment alternative for select difficult biomechanic situations.

Dental Abutments↗
PubMed1998

Fabricating abutment crowns for existing removable partial dentures using custom resin clasp analogs.

A universal approach for fabricating abutment crowns for existing removable partial dentures is described. A replica (analog) of the clasp assembly is generated and transferred to a traditional working cast, which includes the abutment die. The analog is incorporated into the working cast as a removable component to allow the formation of the crown contours. The article reviews in detail the procedures required to transfer accurately all the essential components and information from the mouth to the working cast while allowing the patient uninterrupted use of the removable partial denture. Prestabilizing the removable partial denture, creating the analog impression, avoiding errors due to soft tissue components, forming a precise analog base, selecting materials, generating a rigid resin analog, and prescribing a path of insertion and withdrawal to the analog are described. The method replicates all types of clasps and can generate all types of fixed prosthodontic retainers to function harmoniously with the existing partial denture.

Acrylic Resins↗
PubMed1985

Cantilevered fixed partial dentures in a geriatric population: preliminary report.

This study has shown that treatment with distally extending cantilever fixed partial dentures is a favorable alternative to treatment with removable partial dentures in elderly patients with reduced dentition. In patients with anterior teeth and one or two premolar teeth remaining in the mandible, sufficient occlusal stabilization for a maxillary complete denture was provided by a two- or three-unit cantilever fixed partial denture. A pronounced improvement in chewing function and stability of the maxillary denture was expressed, even by patients who were previously well adapted to wearing removable partial dentures.

Aged↗
PubMed2006

Fabrication of a maxillary implant-supported removable partial denture: a clinical report.

Implant-supported removable partial denture treatment provides an esthetic and functional result that allows proper access for hygiene and maintenance. This article describes the treatment of a patient with a maxillary removable partial denture supported by 3 implants. The use of alignment-correction abutments enabled restoration of misaligned implants.

Dental Abutments↗
PubMed1995

Oral rehabilitation of a patient with congenital partial anodontia using a rotational path removable partial denture: report of a case.

This case report describes the treatment of an adult patient with partial anodontia. Treatment began with the extraction of several retained primary teeth and the insertion of an immediate transitional removable partial denture that was used to evaluate the possibility of increasing the patient's vertical dimension of occlusion. Later, the entire mandibular arch was restored with fixed restorations. Once the vertical dimension of occlusion was established and controlled, the maxillary arch was restored. Metal-ceramic crowns placed on the central incisors were contoured to accommodate a rotational path removable partial denture. The partial denture utilized rigid metal retention on the distal surface of the central incisors instead of clasps. This design produced a very esthetic and stable prosthesis.

Adult↗
PubMed1978

Visualization of stress and strain related to removable partial denture abutments.

The following conclusions are based on the conditions set forth in this investigation and apply to forces acting through a vertical direction of application only: 1. The unilateral removable partial denture produced no more stress than the bilateral removable partial denture. 2. The fully active Dalbo removable partial denture resulted in the greatest stressbreaking action. 3. The rigid Dalbo removable partial denture resulted in the least ridge displacement. 4. The rigid Dalbo removable partial denture resulted in the greatest stress concentrations in the distal abutment. 5. None of the attachments tested resulted in a distribution of the stresses along the edentulous ridge. 6. The use of two abutments (double abutments) resulted in greater stress concentrations in the distal abutment than the use of single abutments. 7. Forces in the single abutment were resisted along the long axis of the root. 8. Forces in the double abutments were resisted along the long axis of the distal abutment.

Alveolar Process↗