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PubMed1991

[On the clinical relevance of the dimensional behavior of silver amalgam. A comparative in vitro and in vivo study].

The clinical relevance of the dimensional behavior of six different gamma-2-free silver amalgam products was examined in comparative in vitro and in vivo trials. Dye penetration tests, roughness measurements, and inspection of the marginal fit using a scanner electron microscope all showed that the results of the in vivo and the in vitro trials were in good agreement and that there was no significant difference between the various products tested, despite the fact that they differed both in morphology and in composition. Copalite exerts a favorable influence on the marginal fit of amalgam restorations, not only in laboratory trials, but also clinically. The results obtained show that the behavior of an amalgam with respect to changes in volume is not the sole criterion by which its quality is to be judged. Amalgams with a pronounced contraction tendency will seal the marginal gap with their corrosion products (SnCl). Here copalite serves as a temporary stand-in. There was no leakage of metal ions from the restoration into the dentin for any of the products tested, including those with a high copper content.

Adult↗
PubMed2002

Predictable fixed prosthodontics: technique is the key to success.

This article reviews step-by-step clinical procedures for fixed prosthodontics that include a discussion of the following case parameters: (1) proper diagnosis and case selection; (2) tooth preparation; (3) soft tissue management; (4) impression making; (5) provisionalization; (6) additional laboratory diagnostic information; (7) case try in; and (8) case delivery. When the clinical principles of these procedures are faithfully followed, the success and predictability of any restorative endeavor will be greatly enhanced.

Cementation↗
PubMed2001

The resin retained natural tooth pontic: a transitional esthetic solution.

This case report presents an alternative treatment option for the premature loss of a maxillary anterior tooth due to severe periodontitis. A natural tooth pontic acid-etch prosthesis was fabricated using the patient's clinical crown from the extracted tooth. This measure proved to be a very adequate, esthetic treatment solution before a permanent restorative plan could be developed for the patient's long term dental needs.

Adult↗
PubMed2000

Single tooth-by-tooth crowns over Frialit-2 implants.

Optimizing aesthetics in the anterior maxilla can be a challenge because of tissue contouring problems. Dental implants allow for restoration of edentulous areas, thus improving function. Some compromises may result as a result of the necessity of predicting the stability of the replacement restorations. The Frialit-2 dental implant system with the internal hex design provides excellent stability for single-tooth restorations. Aesthetics are maximized using Procera Allceram crowns. This case study describes in detail the following: diagnosing and treatment planning for a challenging trauma case; surgical preparation and placement of two Frialit-2 dental implants in the maxillary left central and lateral incisor areas; primary impression techniques and fabrication of a temporary prosthesis over ProTect abutments; second-phase opening; final impressions; and fabrication of two single crowns.

Adult↗
PubMed2003

Treatment planning and soft-tissue management for optimal implant esthetics: a prosthodontic perspective.

Esthetic restoration of implants in the anterior region of the mouth is one of the most difficult procedures to execute. This article discusses patient selection criteria. Implant position and its relationship to the esthetic outcome are also addressed. The importance of soft-tissue management in all phases of the surgical and restorative phases is emphasized. Guidelines are given for the successful delivery of this service for the patient.

Dental Implantation, Endosseous↗
PubMed1990

[Amalgam fillings and T-lymphocyte changes].

Dental amalgam and nickel alloys have been considered quite safe. Previous authors reported the effect of dental amalgam and nickel alloys on human T-lymphocytes modifications after amalgam dental fillings, into dose-dependence of any modifications and into possible temporary. Eight patients were subjected to dental care with amalgam dental fillings. Drawings of blood were executed at start, fifteen days after late fillings and two months later. The results about modifications of T-lymphocytes were not univocal. We believe, at now, that temporary modifications of the immunity seem to be related to a cytotoxic mechanism.

Adolescent↗
PubMed1994

Front tooth replacement with Tübingen (Frialit) implants.

127 Tübingen (Frialit) implants have been clinically evaluated for a 10 year period. The implants were placed in the anterior region of the maxillae of 101 patients to replace lost incisors, cuspids and premolars. Seventy-seven implants were placed within 3 months after loss of a natural anterior tooth, resulting in the preservation of the volume of the alveolar ridge and the contour of the surrounding soft tissues. This preservation of the volume of the alveolar ridge was due to the fact that the Tübingen implants have conical shapes and sizes, equal to those of the roots of natural teeth. The dentine-like colour and the biological properties of the bio-inert Al2O3 implant-material, in most of the cases was an advantage to the aesthetics of the prosthetic restorations and to the condition of the soft tissues in the permucosal area. The Tübingen implant is placed with a one-phase technique implying special care for the temporary restorations to avoid premature loading. Also prevention of overloading the ceramic material by the fixed restoration needs special attention in the construction of posts, cores and crowns. The overall survival-rate in this study with a mean follow-up of 4.5 years was 87%. Patient and dentist satisfaction was high.

Adolescent↗
PubMedDate not supplied

Transitional custom abutments: optimizing aesthetic treatment in implant-supported restorations.

As the discipline of implant prosthodontics continues to evolve, additional emphasis has been focused on the role of adequate emergence profiles and peri-implant soft tissue contours. Despite the development of anatomically shaped healing abutments, currently advocated techniques exhibit clinical limitations. This article introduces the transitional custom abutment technique as a method of manipulating the supra-implant soft tissue contours so that optimal emergence profiles and increased restorative flexibility can be achieved in the treatment of patients with compromised fixture angulation.

Dental Abutments↗
PubMed2004

Placement and replacement of dental restorations.

OBJECTIVE: To determine the types of various dental restorative materials used, and the reasons for the placement and replacement of dental restorations in 10 randomly selected polyclinics in Riyadh, Saudi Arabia. DESIGN: A cross-sectional descriptive study. PLACE AND DURATION OF STUDY: Ten selected polyclinics in Riyadh metropolitan area, Saudi Arabia during a period of two weeks in January 2003. PATIENTS AND METHODS: Information was collected by using a specially-designed form that was distributed to one dentist in each selected polyclinic. The dentists were asked to record specific details for all restorations placed in adult patients. Chi-square tests were used to analyze the data. RESULTS: Data were collected for 326 restorations. Amalgam (52.5%) was the most commonly used restorative material followed by resin composite (31.3%) and temporary restorations (14.4%), with a minimal use of glass ionomer cement (1.8%, p<0.001). Most of the restorations (69.9%) were initial placements, while 30.1% were replacement restorations, (p<0.05). Caries was the major reason for the initial placement (92.1%), and for the subsequent replacement (96.9%) of restorations. CONCLUSION: Amalgam and resin composite were the most commonly used restorative materials. Caries was the major reason for the initial restoration placements and subsequent replacements.

Adolescent↗
PubMed2001

In vitro comparison of peak polymerization temperatures of 5 provisional restoration resins.

BACKGROUND: The heat produced by provisional restoration materials may injure the dental pulp. This study measured and compared peak temperatures during polymerization of 5 materials used in the fabrication of provisional restorations. METHODS: The tested materials were 2 self-curing resins (Integrity and Protemp) and 3 dual-cure resins (Iso-Temp, TCB Dual Cure and Provipont DC). A mould the size of a maxillary molar tooth was fabricated to contain 0.5 cc of resin. The temperature rise of the different materials was recorded every 10 seconds over a 10-minute period. RESULTS: The rise in temperature of Integrity (peak temperature of 33.8 degrees C) and Protemp Garant (35.6 degrees C) was significantly higher than the rise in temperature of Iso-Temp (29.5 degrees C), TCB Dual Cure (28.4 degrees C) and Provipont DC (29.5 degrees C). CONCLUSION: Use of the dual-cure resins in provisional restorations may reduce the risk of pulp injury.

Acrylic Resins↗
PubMed1997

Fracture strengths of provisional restorations reinforced with plasma-treated woven polyethylene fiber.

STATEMENT OF PROBLEM: Fracture strength of interim fixed partial prosthesis is of great concern, especially in long-span restorations or areas of heavy occlusal stress. PURPOSE: Effects of a plasma-treated woven polyethylene fiber (Ribbond) on the fracture strength of polymethyl methacrylate (Coldpac) and a resin-based two-phase curing provisional restorative material (Provipont DC) were evaluated. MATERIAL AND METHODS: A polyvinyl siloxane template was used to fabricate three-unit posterior provisional prostheses on a stainless steel die with two abutments 22 mm apart. The reinforced groups were fabricated by affixing 3 mm wide pieces of fiber treated with methyl methacrylate monomer or polyisocyanate (activator part of Provipont DC) on the occlusal surfaces of abutments. The interim materials were mixed, according to the manufacturers' specifications, and placed in the template. The template was pressed on the die and held secure until complete setting of the material occurred by light curing (Provipont DC) or autopolymerization (PMMA). The specimens were divided into 4 groups of 10 each (A, reinforced Provipont DC; B, unreinforced Provipont DC; C, reinforced PMMA; and D, unreinforced PMMA). A central compressive load force was exerted on the specimen to determine the fracture load of the restorations. RESULTS: The data revealed mean fracture loads of A, 65.59 +/- 11.27 kg; B, 46.59 +/- 14.84 kg; C, 53.46 +/- 7.76 kg; and D, 49.86 +/- 14.44 kg. CONCLUSION: Plasma-treated polyethylene reinforced PMMA restorations showed no significant increase in fracture loads when compared with unreinforced restorations (p > 0.10), whereas reinforced resin-based restorations revealed significantly higher fracture loads (p < 0.01) than the unreinforced resin-based and PMMA provisional restorations.

Bisphenol A-Glycidyl Methacrylate↗
PubMed1995

Porcelain jacket crowns: diagnostic try-ins for optimal aesthetics.

All-ceramic restorations have gained patient acceptance and are increasingly utilized in aesthetic appearance-related restorations. This case report describes the utilization of a leucite-reinforced porcelain to fabricate all-porcelain crowns for maxillary anterior restorations for functional and aesthetic improvement. This particular porcelain system was selected for its high tensile strength, fracture resistance, and excellent marginal adaptation. The new generation adhesive agents combined with highly filled resin luting cements allow the clinicians to create an integral unit between the restoration and the natural tooth. This bond provides high compressive strength and low microleakage. The preparation procedure, the fabrication of tooth-colored wax crowns, the wax try-in procedure, and the laboratory technique of all-porcelain crown fabrication are discussed in detail, using intraoral photographs of the case to illustrate each applicable procedure. The learning objective of this article is to share the knowledge of all-porcelain restoration principles and application and to provide a detailed description and illustration of each clinical procedure.

Aluminum Silicates↗
PubMed2001

Stainless steel crown bridge replacing permanent molar in the adolescent patient: a case report.

The loss of a permanent molar in young adolescent patient creates a need for early space maintenance and restoration of function. To establish function and esthetics short-term treatments include interim restorative approaches. This paper describes a functional, cost-effective stainless steel crown bridge as an interim restoration after the loss of permanent first molar in an early adolescent dentition.

Acrylic Resins↗
PubMed1996

Immediate provisional and long-term anterior prosthodontics: a comprehensive approach.

The success of any anterior prosthodontic restoration depends on many factors. Considering those multiple influences during treatment planning can profoundly affect the long-term success of such cases. Comprehensive dental care involves evaluating all available restoration options for treating any given patient's condition. The dentist is obligated to present all of these options to the patient without bias. The following case reports provide a perspective from which decision-making occurs before treatment planning is accomplished.

Adult↗
PubMed1992

Medications and temporaries in endodontic treatment.

We have attempted to present in this article an overview of the medications used as intracanal dressings during root canal treatment and the materials used to seal endodontic access preparations. Because all the medications reviewed have an antimicrobial effect (with the exception of steroids), they seemingly would be useful in root canal treatment. However, the potentially harmful side effects of the chemical agents, which include cytotoxicity and antigenicity, may make the treatment worse than the cure. With an improved understanding of the principles of root canal cleaning, strong medications placed into canals may be unnecessary. At best, intracanal dressings should be used only in situations that might benefit from such therapy. Temporary restoration of endodontically treated teeth is an essential part of root canal therapy. Commonly used materials and techniques for their uses have been presented. With proper temporization and timely final restoration, the potential for coronal microleakage will be minimized.

Dental Cements↗
PubMedDate not supplied

Sinus grafting using platelet-rich plasma--initial case presentation.

Recent research has indicated that an element of the proteins contained in platelet-rich plasma can be utilized to increase the speed of bone deposition and quality of bone regeneration when augmenting edentulous sites for implant placement. The growth factors present in platelet-rich plasma are believed to initiate a sequence of microscopic events that ultimately result in the formation of osseous tissue capable of supporting implants for subsequent prosthetic restoration. This article demonstrates a surgical protocol used to harvest platelet-rich plasma and the manner in which it can be implemented in a clinical procedure for the restoration of partially edentulous patients.

Aged↗