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At least 469 records · Page 26Linked to original sources
PubMed1983

Removable partial dentures with rotational paths of insertion: problem analysis.

Removable partial dentures designed to use a rotational path of insertion are technique sensitive. When indicated and when the principles discussed are followed, a denture that uses a rotational path can be highly successful. Tooth coverage can be decreased, which is an advantage in plaque control, caries reduction, and periodontal support. Esthetics can be improved without resorting to intracoronal retainers, and the number of components subject to distortion is reduced. When properly designed and constructed, use of a rotational path of insertion can result in a removable partial denture that is strong, hygienic, and esthetic.

Dental Arch↗
PubMed1986

A photoelastic study of rests on solitary abutments for distal-extension removable partial dentures.

With a distal-extension removable partial denture, maximum use of existing oral structures can aid in the total support of the prosthesis and reduce the force on the solitary abutment. Four rests with relieved and unrelieved guide plates were evaluated for optimum stress distribution around the root of a solitary premolar abutment. These rests were the mesial, the distal, the mesial and distal, and the continuous rest. The findings demonstrated that The continuous rest had the most favorable stress concentration. All other rest designs demonstrated more lateral stress than the continuous rest. Relieved guide plates demonstrated 58% less maximum shear stress in the apical portion than unrelieved guide plates.

Dental Abutments↗
PubMed2003

A survey of treatment outcomes with removable partial dentures.

The patient's satisfaction with removable partial denture (RPD) therapy has become an increasingly important factor in prosthetic treatment. This study examined patients' satisfaction with RPDs in relation to some socio-economic variables, patients' habits of wearing and cleaning RPDs, comfort of wearing RPDs and different RPDs characteristics. A questionnaire was devised for the purpose. Two hundred and five patients were required to assess satisfaction with RPDs. They graded RPDs, depending on the level of satisfaction, on scale ranging from 1 to 5. A dentist determined Kennedy classification, material and denture support, denture base shape, number of missing teeth and evaluated denture construction. Majority of the patients were satisfied with the prosthesis. The patients of a higher education level gave lower grades (P < 0.05) to aesthetics of maxillary RPDs. Almost half of the patients were wearing RPDs during the day. Most of the patients cleaned RPDs three times a day. A significant difference was found between the patients' grades for comfort of wearing mandibular RPDs and number of missing teeth and between hygiene of mandibular RPDs and habits of cleaning them. Majority of the patients treated with RPDs were satisfied with the prosthesis. Dissatisfaction was related to mastication, esthetics, number of missing teeth and maintenance of oral hygiene.

Adult↗
PubMed1989

[Inference engines of expert systems for designing removable partial dentures].

The expert system for designing removable partial dentures has a great potentiality for clinical and educational use. The system sorts out several solutions for clinical problems with the aid of logic and data bases stored in the memory bank. The most important part of this system is the inference engine. Production system and frame system are often used as the inference engine. The purpose of this report was to compare different types of inference engine in practical situations. Following conclusion were obtained. 1) Since each type of inference engine has its own advantages and disadvantages, one has to select most suitable one for the purpose of the system. 2) One must select the inference engine type which will help potential user's understanding.

Denture Design↗
PubMed1989

Abutment tooth modification for removable partial denture therapy.

The primary purpose of removable partial denture (RPD) therapy is to preserve existing oral structures. To accomplish this goal, natural teeth are selected to provide the necessary support, bracing, and retention for the removable prosthesis. Unfortunately, the chosen abutment teeth rarely are able to perform their task without some modification, which usually involves altering the tooth's enamel surface or fabricating and placing a crown. This article discusses the criteria and technique used for these modification procedures.

Dental Abutments↗
PubMedDate not supplied

Component failure in removable partial dentures for patients with severe hypodontia.

Removable partial dentures (RPDs) are frequently used in the treatment of severe hypodontia. The failure rates and modes of failure of 138 such prostheses incorporating acrylic resin onlays were assessed in a retrospective survey. Failures primarily occurred either early or late in the life of the prostheses. Particular problems identified were the low wear resistance of acrylic resin onlays and poor fixation of resin components to metal bases, especially when space was limited.

Anodontia↗
PubMed1984

[Local and regional complications of a fixed partial denture].

Local and regional complications of the partial dentures are rare and usually benign. Their effects are variable and include: pain, mobility, elocution difficulties, metallic or burnt taste, nausea, esthetic problems or repeated fractures. They are, to a great extent, avoidable if the prosthesis has been well conceived and produced from models studied on a parallelizer, and if occlusion was investigated in all its positions. Their numbers can be reduced by regular surveillance.

Denture Retention↗
PubMed1993

Implant-supported versus implant-natural-tooth-supported fixed partial dentures.

The use of implants with fixed partial dentures requires that the restorative dentist address a new set of concerns when planning treatment. This paper presents some important issues and evaluates the advantages and disadvantages of each choice, including the decision whether to treat the patient as a totally implant-supported or as a combination case. The special problems of posterior restorations include occlusion, rigid versus nonrigid coupling mechanisms, root intrusion, and screw versus cement retention.

Dental Abutments↗
PubMed1996

Esthetic double-structure fixed partial dentures.

A new technical procedure for fixed partial dentures and single inlays allows the use of a metal supporting structure with independent ceramic coverage. The advantages of the technique are the bonding of metal to beveled dentinal margins with conventional cement and the acid-etched resin composite cementation of the ceramic, which permits more conservative preparation of the teeth. The complexity of the structure, the laboratory costs, and the doubling of the cementation procedures are the main disadvantages of the technique.

Cementation↗
PubMed1990

[Stress analysis of distal free-end removable partial denture].

The study of the force distribution in distal free-end removable partial denture is complicated by the great difference of biomechanical property between the supporting tissue of the distal free-end removable partial denture, abutment tooth and alveolar mucosa under the denture base. Finite element method (FEM) was used in this study to estimate the effect on the abutment tooth and alveolar mucosa under various load conditions. The model is composed of the second premolar, the first molar and the second molar in acrylic resin teeth with the first premolar serving as the abutment. The stress on the abutment tooth was found reduced by 15% on comparing the load condition 3 (222 newton vertical force on each denture acrylic tooth) with the load condition 2 (222 newton vertical force on the second premolar and the first molar), and it can be further reduced by 22% in comparison to load condition 4 (222 newton vertical force on each denture tooth but shared equally to two occlusal contact points per denture tooth). The maximum displacement of the alveolar mucosa was found adjacent to the load area, and the maximum vertical displacement of the alveolar mucosa at load condition 4 is only 0.015 mm greater than load condition 3. It is concluded that when the number of occlusal contacts in distal free-end removable partial denture is increased and evenly distributed, the load on the abutment tooth will be decreased, with only minor effect on the alveolar mucosa.

Biomechanical Phenomena↗
PubMed1999

Investigation of the effect of three sprue designs on the porosity and the completeness of titanium cast removable partial denture frameworks.

STATEMENT OF PROBLEM: Although titanium has been used to cast removable partial denture frameworks, the casting process is arduous and requires specialized equipment. PURPOSE: This study evaluated the ability of 3 sprue designs (tree, ball, and circular) to produce complete, void-free castings of removable partial denture frameworks made from commercially pure titanium. METHODS AND MATERIAL: A cast with a Kennedy class III, modification 1, partially edentulous arch was used. The blocked-out cast was modified to facilitate assessment of the completeness of the casting of the clasp arms. Thirty refractory casts were made, and 10 wax patterns for each sprue design were fabricated and invested with ethyl silicate investment. Castings were made with an arc-type automatic casting machine in an argon atmosphere. Castings were examined with radiographic equipment to detect the presence of voids in the castings, and the completeness to each casting was visually verified. Data on porosities were tabulated and statistically analyzed with 1-way ANOVA followed by Student Newman-Keuls test. Chi-square analysis was used to identify statistically significant differences in casting defects among the 3 sprue designs. RESULTS: No statistically significant differences in the total number of porosities were found between the 3 sprue designs (P =.51). Results of completeness of castings evaluated by using chi-square test revealed a statistically significant deference among the 3 sprue designs (P =.008). CONCLUSION: The ball-sprue design produced the most complete castings for the removable partial denture titanium frameworks.

Analysis of Variance↗
PubMed1989

[Longitudinal study to demonstrate the effectiveness of prevention-oriented therapy with cast removable partial dentures].

Proof of the preventive effectiveness of removable cast partial dentures is given in a prospective clinical longitudinal study over a 2-year period. 34 patients at middle age, treated with these therapy remedy, had been examined by applying a standardised method. In addition to the dental recall program, care for oral hygiene was ensured at regular intervals. Following the objectified findings related to the tooth surfaces, for the first time it must be emphasized that area-differentiated high-risk areas exist requiring painstaking care on cleaning. All together, it has been ascertained that no essential deteriorations in the oral health conditions were found. The conclusions recommend the tried and tested removable partial dentures in respect of their structural conservation effect.

Adult↗
PubMed1993

In-office fabrication of a claspless interim partial denture.

This article describes a technique for making a claspless interim removable partial denture that can quickly and easily be made in the dental office. The unnecessary undercuts are eliminated by use of a block-out putty without the need for duplication of the cast. The prosthesis can be inserted with minimum adjustments.

Dental Clasps↗
PubMed2005

The effect of box preparation on the strength of glass fiber-reinforced composite inlay-retained fixed partial dentures.

STATEMENT OF PROBLEM: Nonstandardized box dimensions for inlay-retained fixed partial dentures (FPDs) may result in uneven distribution of the forces on the connector region of such restorations. PURPOSE: The objective of this in vitro study was to evaluate the effect of box dimensions on the initial and final failure strength of inlay-retained fiber-reinforced composite (FRC) FPDs. MATERIAL AND METHODS: Twenty-one inlay-retained FPDs were prepared using FRC (everStick) frameworks with unidirectional fiber reinforcement between mandibular first premolars and first molars. Boxes were prepared using conventional inlay burs (Cerinlay), and small and large ultrasonic tips (SONICSYS approx). Box dimensions were measured after preparation with a digital micrometer. All restorations were subjected to thermal cycling (6000 cycles, 5 degrees C-55 degrees C). Fracture testing was performed in a universal testing machine (1 mm/min). Acoustic emission signals were monitored during loading of the specimens. Initial and final fracture strength values (2-way ANOVA, Bonferroni post hoc tests, alpha =.05) and failure types (Fisher exact test) were statistically compared for each group. RESULTS: Significant differences (P =.0146 and P =.0086) were observed between the groups in the dimensions of the boxes prepared using conventional burs buccolingually (2.8-3.0 mm in molars, 3.1-4.3 mm in premolars) and the small size (2.5-2.9, 2.9-3.8 mm) or large size (2.6-3.8, 3.2-4.9 mm) ultrasonic tips for the premolars and the molars, respectively. No significant differences were found at the initial and final failures between the conventionally prepared group (842 +/- 267 N, 1161 +/- 428 N) and those prepared with either small (1088 +/- 381 N, 1320 +/- 380 N) or large ultrasonic tips (1070 +/- 280 N, 1557 +/- 321 N), respectively. The failure analysis demonstrated no significant difference in failure types but predominant delamination of the veneering resin (85%) in all experimental groups. According to acoustic emission tests, a higher energy level was required for final failure of the FRC FPDs with boxes finished using small ultrasonic tips. CONCLUSION: Standardized box dimensions showed no significant effect on fracture strength at either initial or final failure of the fiber-reinforced FPDs. The FRC FPDs with boxes refined with small ultrasonic burs required a greater energy level before failure. The type of failure observed after the fracture tests was primarily delamination of the veneering resin.

Acoustics↗
PubMedDate not supplied

Cement failure loads of 4 provisional luting agents used for the cementation of implant-supported fixed partial dentures.

The major disadvantage of cement-retained implant-supported fixed partial dentures (FPDs) is difficulty in retrievability. The retentive strengths of the provisional luting agents usually employed in these cases are therefore an important consideration. This study evaluated the cement failure loads of 4 provisional luting agents used for the cementation of FPDs supported by 2 implants or 4 implants. Nogenol luting agent exhibited the lowest retentive values in both types of FPD. ImProv proved to be the most retentive cement of all tested. Temp Bond NE and Temp Bond presented significantly different values (P < .05) for the 2-implant FPD, but not for the 4-implant model. On the basis of the study results, it may be concluded that Nogenol appears to be more appropriate for cementation of both 2- and 4-implant-supported FPDs when removal of the provisionally cemented superstructure is anticipated.

Analysis of Variance↗
PubMed1991

A provisional removable partial denture for use during construction of an anterior splint bar prosthesis.

A technique for constructing a provisional removable partial denture before and during construction of an anterior splint bar prosthesis is described. The provisional prosthesis is easily adapted to fit the splint bar prosthesis after it is cemented in place. The technique assures that the patient will enjoy the benefits of a well-fitting and esthetic provisional restoration through all phases of construction of the splint bar and the final removable partial denture.

Denture Design↗
PubMed2005

Clinical long-term survival of two-retainer and single-retainer all-ceramic resin-bonded fixed partial dentures.

OBJECTIVES: All-ceramic resin-bonded fixed partial dentures (RBFPDs) were introduced as a conservative treatment approach 15 years ago. The purpose of this prospective study was to evaluate the long-term clinical survival of RBFPDs made with a conventional two-retainer design or a cantilever single-retainer design. METHOD AND MATERIALS: A total of 37 anterior RBFPDs were made from the glass-infiltrated alumina ceramic In-Ceram. Sixteen RBFPDs with a conventional two-retainer design were inserted in 14 patients, and 21 RBFPDs with a cantilever single-retainer design were inserted in 16 patients. Panavia or Panavia 21 were used as luting agents either after silica-coating and silanation or after air-abrasion only. Patients were recalled every year for a clinical examination to evaluate the restorations with regard to function and possible failures. The mean observation time in the two-retainer group was 75.8 months, and in the single-retainer group it was 51.7 months. RESULTS: No restoration debonded. In the two-retainer group, one restoration was lost because it fractured after 3 months at both connectors and one restoration was removed alio loco accidentally. Also in this group, four RBFPDs fractured within 15 months after insertion at one connector, but the pontic remained in situ as a cantilever RBFPD for several years. In the single-retainer group, only one FPD fractured and was lost 48 months after insertion. The 5-year survival rate was 73.9% in the two-retainer group and 92.3% in the single-retainer group. When unilateral fracture of a FPD was taken as criterion for failure, the five-year survival rate decreased to 67.3% in the two-retainer group. CONCLUSIONS: Cantilever all-ceramic resin-bonded fixed partial dentures made from high-strength oxide ceramics present a promising treatment alternative to two-retainer RBFPDs in the anterior region.

Aluminum Oxide↗