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PubMed1999

Microhardness of provisional fixed prosthodontic materials.

STATEMENT OF PROBLEM: Provisional restorations play a critical role in the success of restorative treatment. Thus, the provisional restoration must maintain its surface integrity throughout the restorative process. PURPOSE: This study evaluated the microhardness of 5 prosthodontic provisional materials. MATERIAL AND METHODS: Cylindrical samples of 3 bis-acryl resin composites (Integrity, Protemp Garant, Temphase) and 2 methyl methacrylate acrylic resins (Jet, Temporary Bridge) were fabricated (n = 5 per material). Specimens were wet-sanded through 600 grit abrasive and stored in artificial saliva at 37 degrees C for a total of 14 days. Baseline Knoop hardness (KHN) was measured 24 hours after specimen fabrication. Three microhardness measurements were obtained from each specimen. Knoop hardness was again recorded after 14 days of storage. RESULTS: ANOVA and Duncan's tests (P<.05) indicated a significant difference between the methyl methacrylate type resins and the bis-acryl resin composites at both time intervals. CONCLUSION: The hardness of most materials (Integrity, Protemp Garant, Jet) decreased over time. All of the bis-acryl resin composite materials exhibited superior microhardness over traditional methyl methacrylate (Jet, Temporary Bridge) resins.

Analysis of Variance↗
PubMed1999

Effects of chemical disinfectants on surface characteristics and color of three fixed prosthodontic crown materials.

STATEMENT OF PROBLEM: Dental restorations should reproduce similar optical effects as natural tooth structure to achieve a good color match. Mismatch can result in unsatisfactory shade matching. PURPOSE: This study determined whether chemical disinfectants affected the surface texture and color of 3 fixed prosthodontic materials. MATERIAL AND METHODS: Five chemical disinfectants (Clorox, Banicide, Cidex-7, Biocide, and Multicide) in combination with 3 restorative materials (Dicor, Vita VMK ceramometal porcelain, Midas ADA type III noble casting alloy) were evaluated at 4 different times of immersion (10 minutes, 30 minutes, 24 hours, and 7 days). Changes from baseline for surface roughness and color were evaluated. Surface roughness data were recorded with a surface analyzer and color data in CIE L*a*b* color space were measured with a colorimeter. Data were analyzed with repeated measures analysis of variance and single factor analysis of variance. RESULTS: There were no statistical differences in surface roughness among disinfectants and restorative materials. However, there were statistical differences of changes in color, increase in deltaE and decrease in deltaL, among disinfectants and the noble casting alloy. CONCLUSION: Only 2 of the 3 materials evaluated, Dicor and Vita VMK ceramometal porcelain, can be used with all 5 disinfectants up to 7 days of immersion. Three chemical disinfectants (Biocide, Clorox, and Multicide) caused clinically significant color changes with the noble casting alloy after 7 days of immersion.

Analysis of Variance↗
PubMed1999

Tissue sculpturing: an alternative method for improving esthetics of anterior fixed prosthodontics.

Esthetics associated with health of surrounding tissues in fixed prosthodontics is arduous, especially when treating the maxillary anterior region. An unfavorable relationship between residual ridge, pontic, and gingival papilla commonly compromises the final result. Alternative procedures based on biologic procedures can be developed to improve relationships and provide esthetic and functionally acceptable fixed partial dentures. This article describes a technique for the improvement of esthetics with conditioning of the tissue beneath the pontics, by displacing tissue with a treatment restoration. Lateral displacement of tissue under gradual, controlled pressure enhances the interdental papilla, which improves esthetics. The role of plaque control is also discussed in this article.

Alveolar Process↗
PubMed1999

Current status of luting agents for fixed prosthodontics.

STATEMENT OF THE PROBLEM: The long-term clinical outcome of fixed prosthodontic treatment depends, in part, on the use of adhesives that can provide an impervious seal between the restoration and the tooth. There are several types of available luting agents, each possessing unique properties and handling characteristics. No one product is ideal for every type of restoration. PURPOSE: The purpose of this article is to review available dental luting agents, discuss improvements and drawbacks in newly formulated adhesives, and present the indications for their use. RESULTS: Each cement type is physically and chemically unique. A single adhesive will not suffice in modern day clinical practice.

Adhesives↗
PubMed1997

The implant in prosthodontics today--a personal viewpoint.

Implants in prosthodontics have come a long way in the last 15 years. General dental practitioners today perform procedures that were once carried out only by highly trained specialists, and the subject is now taught to undergraduates in some dental schools. Harold Preiskel looks at the current techniques used in implantology and gives advice from his wealth of first-hand experience.

Dental Abutments↗
PubMed2004

Orthodontic and prosthodontic treatment of ectodermal dysplasia--a case report.

In addition to its other symptoms, ectodermal dysplasia causes anodontia and hypodontia intraorally. Partial or total anodontia results in some loss of function, such as chewing, and affects aesthetics. Prosthodontic rehabilitation can be accomplished with fixed, overdenture, complete, or implant-retained prostheses. For rehabilitation, it is crucial to know the age, number and condition of present teeth, and the state of growth of the patient. A 10-year-old male patient who visited our clinic was treated by a multi-disciplinary team of surgeons, orthodontists, and prosthodontists. An overdenture was planned, and an implant-supported prosthesis was considered for when the patient had finished growing. A clasp retained over the denture was planned for prosthetic rehabilitation after considering his growth and the number and condition of his present teeth.

Anodontia↗
PubMed2005

Contemporary dental practice in the UK: indirect restorations and fixed prosthodontics.

OBJECTIVES: To investigate, by questionnaire, the use and selection of materials and techniques for indirect restorations and fixed prosthodontics by dental practitioners in the North West of England and Scotland. METHODS: A questionnaire was sent to 1,000 general dental practitioners selected at random from dentists in Scotland and the North West of England. Non-responders were sent another questionnaire after a period of 4 weeks had elapsed. RESULTS: A total of 701 usable questionnaires were returned, giving a response rate of 70%. When selecting a material for the core build-up of vital teeth, practitioners used the following materials (%): amalgam (60), dual and light-cured resin composite (54), glass-ionomer cements (47), compomer (29) and resin-modified glass-ionomer cements (24). Where the use of a post was indicated indirect posts of both precious (67) and non-precious (37) alloys were preferred to prefabricated posts by the majority of practitioners for the restoration of root filled teeth. Direct titanium (14) and stainless steel (14) posts were not used extensively. Impression materials used by the practitioners were as follows: addition-cured silicone (70), condensation-cured silicone (20), polyether (9) and polysulphide (2). Traditional glass-ionomer cements (59) were used for the luting of single and multiple porcelain fused to metal units, with zinc phosphate and polycarboxylate cements (33) being the preferred alternatives. CONCLUSIONS: The majority of the practitioners surveyed in this study used: amalgam for core build-ups; indirect posts; addition-cured silicone for impressions; and glass-ionomer cements for luting procedures.

Crowns↗
PubMed2002

Prosthodontic management of the curve of Spee: use of the Broadrick flag.

Proper management of the occlusal plane is an essential consideration when multiple long-span posterior restorations are designed. When restorations are added to an existing tooth arrangement characterized by rotated, tipped, or extruded teeth, excursive interferences may be incorporated, resulting in detrimental sequelae. The curve of Spee, which exists in the ideal natural dentition, allows harmony to exist between the anterior tooth and condylar guidance. An instrument called the Broadrick flag has been used to assist in the reproduction of tooth morphology that is commensurate with the curve of Spee when posterior restorations are designed; its use prevents the introduction of protrusive interferences. Consideration also must be given to lateral excursive movements when the occlusal plane is designed. In this article, the importance of the curve of Spee in prosthodontic and restorative dentistry is discussed, and a patient treatment demonstrating use of the Broadrick flag is described.

Adult↗
PubMed2002

Prosthodontic rehabilitation of a patient with partial anodontia: a clinical report.

This clinical report describes the prosthodontic rehabilitation of a 22-year-old female patient diagnosed with partial anodontia. A combined dental therapy approach was used and included endodontic therapy and a post-and-core buildup on the mandibular left canine, fabrication of a mandibular removable denture, and fabrication of maxillary fixed restorations. Canine-protected occlusion was developed in the final restorations to decrease lateral forces on the posterior dentition. Protrusive guidance was evenly distributed across the maxillary and mandibular incisors. Functional and esthetic results were achieved.

Adult↗
PubMed2002

Prosthodontic rehabilitation of a patient with total avulsion of the maxilla: a clinical report.

Patients with complete avulsion of the palate may require extensive surgical and prosthodontic rehabilitation. The prosthesis should replace not only missing teeth but also lost soft tissues and bone, including the hard palate, residual alveolar ridges, and in some situations, the soft palate. This clinical report describes the prosthetic rehabilitation, after appropriate surgical options had been exhausted, of a patient with bilateral traumatic avulsion of the maxilla.

Adolescent↗
PubMed1990

Prosthodontic management following craniomandibular pain and dysfunction therapy: a review of the literature.

Much of the literature on craniomandibular joint (CMJ) dysfunction-pain (previously called temporomandibular joint (TMJ) dysfunction-pain) is focused on the etiology and treatment of symptoms, with little discussion of finalization procedures. Craniomandibular disorders encompass a broad range of patient complaints, and the therapies used for these symptoms include an entire spectrum of treatment modalities. Following successful therapy in Phase I, the problem facing the dentist is how to finalize treatment. This paper is a review of the literature on Phase II management including rationale, principals, and methods of stabilizing and rehabilitating the occlusion, emphasizing the prosthodontic perspective.

Dental Occlusion↗
PubMed1999

Fixed prosthodontics in skeletal Class III patients with partially edentulous jaws and age-related prognathism: the basal osseointegration procedure.

Today, prognathism in the partially or completely edentulous jaw can be treated with endosteal implants and fixed prostheses. The preferred procedure uses basal osseointegration. If the distribution of available bone is favorable, the prosthodontic suprastructures can be loaded early, taking the various phases of bone regeneration into account. Invasive surgical interventions, specifically iliac crest transplants, are rarely indicated and can be avoided in most cases. Patients are able to return to their everyday lives within a few days.

Age Factors↗
PubMed2002

SwissPlus Implant System, Part 2: Prosthodontic aspects and intersystem comparisons.

Incompatibility between implant systems and the increasing complexity of esthetic restorative options frequently require dentists to obtain special training in the selection and use of prosthetic components. SwissPlus System implants have been designed to simplify restorative procedures by eliminating many ancillary restorative components. The implants are packaged on a fixture mount that also functions as a transfer and as an abutment for cemented restorations. For multiple-unit, screw-retained restorations, the prosthesis can be splinted directly to the top of the implant without an intermediate abutment. Overdenture attachments, straight, angled, screw-receiving, and custom-cast abutments complete the restorative system. This paper presents an overview of the SwissPlus System's prosthodontic aspects. Test data also illustrate intersystem compatibility and differences between SwissPlus System implants and ITI syn-Octa implants.

Dental Abutments↗
PubMed1979

The prosthodontic rehabilitation of selected adults class III malocclusions.

In a previous paper (Murray 1978) some of the problems associated with currently employed preoperative assessment aids were discussed. Techniques were described for establishing the occlusal vertical dimension of occlusion, and support for the upper lip. The incorporation of these treatment planning aids in the prosthodontic rehabilitation of two adult cases, with class III malocclusions, is reported.

Adult↗
PubMed1990

Assessment of adverse reactions to prosthodontic materials.

In 1978 five cases of so-called hypersensitivity reactions to Scutan and two to Impregum were reported (Dahl, 1978). The aim of the present study was to assess whether hypersensitivity or cell-mediated immune reactions were associated with the adverse clinical reactions in these patients or in others who had experienced the same reactions. Epicutaneous patch testing and lymphocyte transformation tests were carried out in a total of 13 individuals. The findings were difficult to interpret, because there was no consistent association between skin reactions and cell-mediated immune responses in subjects with suspected allergies. Other possible reasons for the reactions originally recorded were therefore discussed. It was concluded that adverse reactions associated with immune-mediated, delayed type hypersensitivity reactions may be elicited by prosthodontic materials, but other pathogenic mechanisms and aetiological factors responsible for the reactions observed should also be considered.

Adult↗
PubMed1990

Wear of prosthodontic materials--an in vivo study.

The aim of this investigation was to study quantitative and qualitative aspects of the wear process of some prosthodontic materials in three different persons in vivo. The in vivo models combined two methods: removable double crowns and a replica technique. The wear resistance of gold (types III and IV), porcelain and a microfilled resin was studied opposing metal ceramic crowns and in one person when opposing all four materials. All three persons had earlier histories of occlusal wear of teeth and/or restorations. The wear rate of gold and porcelain showed equal values antagonizing metal ceramic crowns in all three persons. The microfilled resin had a wear rate three or four times higher in the same situations. No significant difference in wear resistance could be found between type III and type IV gold alloys. The wear mechanism seemed to be a fatigue type in porcelain, and in gold a combined fatigue and abrasive type of wear. The microfilled resin showed mainly a fatigue type of wear but some observations indicating a tribochemical reaction were also made.

Composite Resins↗
PubMed2005

A prosthodontic management alternative for scleroderma patients.

Hardening of the skin around the mouth causes the oral opening to become limited in scleroderma patients. A maximal oral opening that is smaller than the size of a complete denture can make prosthetic treatment challenging. This clinical report presents the prosthodontic management of a total edentulous patient with microstomia induced by scleroderma. Sectional mandibular and maxillary trays and a collapsed mandibular denture were fabricated for the total edentulous patient. With the use of lingual midline hinge, the collapsed denture was successfully and easily inserted and provided adequate function in the patient's mouth. The cast hinge design reduced the overall costs and simplified the laboratory technique.

Adult↗