[Statistical investigation of crown and fixed partial denture prostheses (author's transl)].
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Crowns↗
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[Stress registered by the tooth support of a partial denture using a photoelasticometric method].
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Dental Instruments↗
Photoelastic stress analysis in a pier retainer of an anterior resin-bonded fixed partial denture.
STATEMENT OF PROBLEM: A clinical situation may arise with 2 edentulous spaces and a single intact pier tooth. A dentist may restore these edentulous spaces with a long span resin-bonded fixed partial denture using the pier and the 2 terminal abutments for bonding. PURPOSE: This study analyzed the stresses induced in a pier retainer of an anterior resin-bonded fixed partial denture and determined the effect on a pier abutment. MATERIAL AND METHODS: Photoelastic materials were selected to represent the relative stiffness of 3- and 5-unit resin-bonded fixed partial dentures. The models were scaled to x2.5 to enhance visual analysis of the stress pattern. RESULTS: Isochromatic fringes indicated a stress magnitude at the proximolingual areas of the pontic in the 3-unit resin-bonded fixed partial denture. In the 5-unit resin-bonded prosthesis, the stress pattern appeared to involve the entire surface of the pier retainer. CONCLUSION: The use of pier abutments should be avoided and it is more favorable to use 3-unit resin-bonded fixed partial dentures.
Dental Abutments↗
[A transducer for the measurement of torque transmitted to abutment teeth of removable partial dentures].
A transducer for the measurement of torque transmitted to abutment teeth of removable partial dentures was newly developed. The transducer was composed of a right cylinder (12.0 mm x 3.5 mmø) made of phosphor bronze as the torsion bar, to the surface of which two strain gauges (KFC-2-D2-11, KYOWA) are adhered symmetrically about the axis of the bar. Torque transmitted to the transducer was detected and evaluated as tensile strain and compressive strain on the torsion bar surface by means of strain gauges. The transducer was small enough to be easily applied to removable partial dentures for the measurement of torque transmitted to crowns of abutment teeth, and showed satisfactory precision (The instrumental error in measurement was within 3%). In the present study, the newly developed transducer was revealed to be useful for the measurement of torque transmitted to crowns of abutment teeth by removable partial dentures.
Dental Abutments↗
Meta-analysis of fixed partial denture survival: prostheses and abutments.
STATEMENT OF PROBLEM: Few estimates of the probability of various outcomes associated with replacement of missing teeth with fixed partial dentures have been reported. Existing longitudinal studies have reported widely disparate results for the survival of fixed partial dentures, but these studies have used different definitions of failure and varying periods of follow-up. PURPOSE: This study used meta-analysis to formulate annual probability estimates for three categories of fixed partial denture or abutment survival. METHODS: A systematic review of the English language literature since 1960 identified eight studies that met the preset inclusion criteria. Estimated annual survival proportions were back-calculated based on the Kaplan-Meier model and these proportions were combined through a fixed effects model meta-analysis. The probabilities and corresponding 95% confidence intervals at 5, 10, and 15 years for the three categories of survival are reported. RESULTS: For the aggregate population represented by the limited longitudinal studies available, this meta-analysis indicated that less than 15% of fixed partial dentures were removed or in need of replacement at 10 years; whereas, nearly one third were removed or in need of replacement at 15 years. Less than 5% of abutments were removed at 10 years.
Confidence Intervals↗
Oral conditions and aptitude to receive implants in patients with removable partial denture: a cross-sectional study. Part II Aptitude.
The aim of this study was to evaluate the possibility of replacing removable partial denture (RPD) with fixed partial dentures on osseointegrated implants in a selective group of patients with partially edentulous lower jaws. Forty patients were evaluated to receive implants. Twenty-three patients showed a precarious oral hygiene, five patients refused the treatment (being satisfied with their RPD), six refused for economic reasons, three patients refused for fear and scepticism, one for long duration of therapy, and one was not treated because of a very marked atrophy of the alveolar crest. Finally, one patient was treated with implants. For these reasons, at the present time implants are not an appropriate treatment for introduction into large-scale public health programmes and RPD must still be considered a valid therapeutic procedure.
Adult↗
The fit of fixed partial dentures joined by infrared soldering.
This study determined the accuracy of fit of three-unit fixed partial dentures joined by an infrared soldering technique compared with one-piece fixed partial denture castings and individually cast crowns. Wax patterns of prepared Ivorine teeth, maxillary left central incisor and maxillary left canine, were injection molded; a plastic rod was used as a pontic. One group of patterns was cast as one-piece dentures; the other group was sectioned in the connector area, cast individually and then joined by infrared soldering. Castings were seated on their respective dies, embedded in epoxy resin, and sectioned. Gap distances between the casting and the die were measured at specified marginal sites with a profile projector. Results showed that the fit of infrared-soldered fixed partial dentures was significantly better than that of one-piece castings and was comparable with the fit of single crowns. The gap openings measured in all castings were within the range of clinical acceptability.
Crowns↗
Interim acrylic resin duplicate removable partial dentures.
Certain dental procedures require patients to be without their removable partial dentures. This can be a great inconvenience and psychologically difficult for some patients. This procedure permits duplicating existing removable partial dentures so that patients will not have to be without prostheses.
Acrylic Resins↗
Restoration of supporting teeth for existing removable partial dentures.
A technique for restoration of abutment teeth under existing removable partial dentures is presented. This technique uses rubber dam isolation for moisture control and involves condensing the amalgam with the partial denture seated to assure correct adaptation to the existing framework.
Dental Abutments↗
Use of a multifunctional precision attachment in a fixed partial denture with limited periodontal support. A clinical report.
A multifunctional precision attachment used in a fixed partial denture with questionable prognosis enhances the serviceability of the reconstruction. In the treatment presented, future loss of the posterior abutments will not jeopardize the complete rehabilitation. Osseointegrated implants used in conjunction with a fixed prosthesis or a removable partial denture can restore the missing segments.
Cuspid↗
Maxillary and mandibular overlay removable partial dentures for the treatment of posterior open-occlusal relationship: a clinical report.
This clinical report describes the use of maxillary and mandibular overlay removable partial dentures to treat a patient with class III skeletal malocclusion and a posterior open-occlusal relationship. Overlay removable partial denture therapy was used as an alternative to other options such as orthodontics and combined orthodontic/oral surgery procedures; it satisfied the esthetic and functional requirements of the patient and provided a stable occlusion. Overlay removable partial dentures are a reversible and relatively inexpensive treatment for patients with congenital or acquired anomalies, but the potential disadvantages of these prostheses include compromised esthetics when the dentures are removed; caries and periodontal disease as a result of poor oral hygiene; and veneer material fracture, debonding, discoloration, and wear.
Chromium Alloys↗
Mandibular bone mineral density changes in complete and removable partial denture wearers: a 6-month follow-up study.
PURPOSE: The purpose of the study was to determine the changes in bone mineral density of the mandible in complete and removable free-end saddle denture wearers over a 6-month period. MATERIALS AND METHODS: Twenty removable partial denture patients and 20 complete denture wearers participated. Two dental panoramic radiographs were taken from each patient, the first prior to denture delivery and the second after 6 months of denture wearing. Bone mineral density measurements were performed on panoramic radiographs with a five-step copper stepwedge attached to each film cassette. Bone mineral density values of the measured regions of interest were expressed in equivalents of the stepwedge thickness (mm). RESULTS: The results revealed minor changes in bone mineral density values of the examined regions in the 6-month period. Under the distal end of complete denture saddles, the bone mineral density values decreased, whereas the values under the distal end of removable partial dentures increased. However, the difference between the first and second measurements was not significant. In each of the examined groups, the bone mineral density values at the gonion increased significantly by approximately 20%. This was attributed to the increased strain forces of the masseter muscle at the gonion after denture delivery. CONCLUSION: Significant increase of bone mineral density values was registered 2 mm above the gonion in both complete and removable partial denture wearers. Age and gender were not related to the bone mineral density changes over a 6-month period.
Absorptiometry, Photon↗
[Quantitative changes of microflora on stress-bearing areas relating to bases of removable partial dentures].
OBJECTIVE: This study was designed to find out the changes in microflora on the stress-bearing areas after insertion of removable partial dentures, and in turn to explore the difference between such changes caused by metal bases and acrylic resin bases respectively. METHODS: Sixteen patients who were ready to accept removable partial dentures were selected and divided into two groups. Eight patients used metal bases while the other eight patients used acrylic resin bases. Then at the following three points: before dentures were inserted, one month after wearing and three months after wearing, the total cultivable flora were counted and the proportions of bacteria detected on the stress-bearing areas were calculated. RESULTS: No matter what type of bases was selected, the wearing of removable partial denture enhanced the accumulation of microflora on stress-bearing areas. The percentages of Candida albicans and Lactobacilli detected on stress-bearing areas also increased significantly (P < 0.05). When such changes were compared, the authors found that the increment of Candida albicans caused by acrylic resin bases was higher than that caused by metal bases (P < 0.05). CONCLUSION: The wearing of removable partial dentures forms new retention areas between the bases and the stress-bearing areas, as a result enhances the deposit of microbe and facilitate the growth of Candida albicans and Lactobacilli. Compared with increment of Candida albicans caused by metal bases, the increment relating to acrylic resin bases is more evident.
Aged↗
Relationship between the standards of removable partial denture construction, clinical acceptability, and patient satisfaction.
STATEMENT OF PROBLEM: Little is known about the importance of published fabrication standards in determining the outcome of treatment with mandibular distal extension removable partial dentures in patients of community practices. PURPOSE: This study describes mandibular partial dentures worn by patients from King County, Wash., and examines the validity of standards of design and fabrication by relating the standards to measures of clinical acceptability and patient satisfaction. MATERIAL AND METHODS: Eighty-two people treated in private dental practices who responded to a mail survey about satisfaction with a partial denture were examined. Eight standards of fabrication, overall clinical acceptability of the prosthesis, and tissue health were evaluated clinically. Patient satisfaction was assessed by questionnaire. Associations between variables were assessed by contingency tables and odds ratios. RESULTS: Half the prostheses met 4 or fewer of the 8 standards, and these were responsible for nearly all the displacement of tissue by the framework. Forty-three percent of the dentures (35/82) were rated clinically acceptable. Of the remaining dentures, 38 could be made acceptable by modifications. The remaining 9 dentures needed replacement. Sixty-three percent of the patients examined were satisfied with the dentures. There was a relationship between tissue health and the fabrication standards related to rest form, base extension, stress distribution, and framework fit. This study found no relation between tissue health and other design or fabrication features. None of the standards were found to be related to patient satisfaction. CONCLUSION: This study found partial support for the validity of design/fabrication standards for removable partial dentures. The most important standards are rest form, base extension, and stress distribution. The standards appear to be unrelated to patient satisfaction.
Dental Stress Analysis↗
[The use of Dental D (polyacetal resin) as an alternative for chrome-cobalt removable partial denture: a case report].
Polyacetal resin (Delrin) is well known material in many medical fields as for artificial heart valves and artificial hip joints. In dentistry the material is known as Dental D, and among its other applications, is used for removable partial dentures. The article presents a cleft lip and palate patient with missing teeth (12 and 22). The patient underwent on operations for closure of the cleft, but even so some sinus tracts from the nasal cavity to the soft and hard palate exist. The patient was rehabilitated 10 years ago with chrome-cobalt removable partial denture, but lately, episodes of swelling and burning sensation were reported. The patient was diagnosed (by the allergy clinic in Hadassah hospital) as allergic to chrome-cobalt. Some optional treatment plans were offered to the patient (fixed, which involved an operation of closing the fistulas, and then a fixed restoration, another option was removable denture with Dental D). The patient chose to be rehabilitated with Dental D removable partial denture, which closes the fistulas and reconstructs the missing teeth. Due to the physical properties of the Dental D, its biocompatibility and the improved esthetics results, the Dental D can be a good alternative for the chrome-cobalt removable partial denture. The esthetic results with the Dental D, as far better than the conventional partial denture.
Chromium Alloys↗
A photoelastic analysis of the stress distribution in bone supporting fixed partial dentures of rigid and nonrigid design.
Within the limitations of the experiment, the following conclusions can be made from this investigation: 1. Under conditions of vertical loading, the rigid fixed partial denture design does not permit independent response by either abutment. The nonrigid fixed partial denture design allows the abutments some independence in response to vertical loading 2. The stress distributions and concentrations produced in the supporting bone are favorably altered by the placement of a fixed partial denture of rigid or nonrigid design. 3. The distribution of stresses in the supporting bone varies with the number and location of the loading sites. 4. Under conditions of vertical loading, the Ney and Stern nonrigid fixed partial denture designs exhibit no significant differences in stress distribution or concentration.
Alveolar Process↗
Frictional resistance of removable partial dentures with retrofitted resin composite guide planes.
Frictional resistance to the dislodging forces of a removable partial denture with and without resin composite retrofitted guide planes was compared in vitro. Six master models of four natural teeth, each simulating a Kennedy Class III modification 1 arch, were used. Guide planes were prepared, and 18 cobalt-chromium removable partial denture frameworks without clasps were fabricated. Three resin composite materials were applied to the guide planes as retrofitting materials. Following this, the resistance to dislodgment of the removable partial denture framework was evaluated under cyclic dislodgment, and the resistance to dislodgment before and after resin composite retrofitted guide planes was compared. The dislodgment force was recorded every 500 cycles. Testing was concluded when the dislodging force value reached 50% of the initial value. There was a significant difference between the dislodging forces with and without retrofitted guide planes. Higher dislodging forces were recorded when resin composite retrofitted guide planes were used. Z100 was the most effective retrofitting material under cyclic dislodgment, and Heliomolar and Herculite XR performed similarly.
Acrylic Resins↗
A randomized clinical trial of two basic removable partial denture designs. Part I: Comparisons of five-year success rates and periodontal health.
A randomized clinical trial was undertaken to compare the effectiveness of two partial denture designs, one with I-bar (bar) and the other with circumferential retainers (circumferential), in 134 patients with Kennedy class I and class II edentulous conditions. A total of 30 partial dentures were considered failures, five because of abutment failures and 25 because of the lack of removable partial denture use for eating. The 5-year success rate of 71.3% for the circumferential design did not differ significantly from the 76.6% for the bar design (p > 0.05). There were no discernible changes in the nine periodontal health components of abutment teeth with either of the two designs after 60 months. The results indicate that the two designs do not differ significantly in terms of success rates, maintenance care, and effects on abutment teeth. A well-constructed removable partial denture of either design, supported by favorable abutments and accompanied by a regular recall program offers a satisfactory treatment modality.
Alveolar Bone Loss↗