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At least 433 records · Page 24Linked to original sources
PubMed1992

[The fundamental method of preventive prosthodontics: complex rehabilitation of the masticatory organ].

The most effective prosthetic prophlaxis could be the prevention of causes leading to tooth extractions. As now the caries and periodontal preventions are not efficient enough we are obligated to deal with the consequences of tooth loss. Even the loss of a single tooth might cause disfunctions in the masticatory system. Besides the well known consequences, like diminished masticatory, phonetic functions and esthetical problems we have to face to the consequences related to morphological changes in the dentition leading to difficulties in prosthodontic treatment planning and tooth preparation. So, the most important step in prosthodontic prophylaxis is the early replacement of the lost tooth. The early prosthetic reconstruction can only be prophylactic if it does not interfere with the normal hygienic procedures in the oral cavity. Consequently it is very important to consider all the possible factors affecting the oral hygiene during our prosthetic treatment planning. We should also consider the basic gnatological principles in designing the occlusal surface of crowns and pontics to avoid any traumatic occlusal forces related to our would be reconstructions.

Humans↗
PubMed1991

The effect of connector design on cement retention in an implant and natural tooth-supported fixed partial denture.

This study investigated the effect of connector design, rigid or nonrigid, on cement retention in a combined implant and natural tooth-supported fixed partial denture. A prepared natural tooth was placed in a Plexiglas block in a manner that it could move approximately the same as a healthy premolar. An endosseous implant was placed in the block so that it was immobile. Joining the prepared tooth and implant was a fixed partial denture that could be made rigid or nonrigid. The natural tooth retainer was cemented to the prepared tooth, and the implant retainer was affixed to the implant fixture with a gold screw. One year of stress was applied to the fixed partial denture by a force simulation machine. Twenty randomly ordered tests were completed, 10 of each connector design. Retentive values for the cemented retainers were recorded and statistically compared by use of Student's independent t test. No significant difference in cement retentive strength between designs was found (p less than 0.05).

Bicuspid↗
PubMedDate not supplied

Restoring the incisal edge.

Restorative dentistry evolves with each development of new material and innovative technique. Selection of improved restorative materials that simulate the physical properties and other characteristics of natural teeth, in combination with restorative techniques such as the proximal adaptation and incremental layering, provide the framework that ensures the optimal development of an esthetic restoration. These advanced placement techniques offer benefits such as enhanced chromatic integration, polychromatism, ideal anatomical form and function, optimal proximal contact, improved marginal integrity and longer lasting directly placed composite restorations. The purpose of this article is to give the reader a better understanding of the complex restorative challenge in achieving true harmonization of the primary parameters in esthetics (that is, color, shape and texture) represented by the replacement of a single anterior tooth. The case presented demonstrates the restoration of a Class IV fracture integrating basic adhesive principles with these placement techniques and a recently developed nanoparticle hybrid composite resin system (Premise, Kerr/Sybron, Orange, CA). The clinical presentation describes preoperative considerations, tooth preparation, development of the body layer, internal characterization with tints, development of the artificial enamel layer, shaping and contouring, and polishing of a Class IV composite restoration. The clinical significance is that anterior tooth fractures can be predictably restored using contemporary small particle hybrid composite resin systems with the aforementioned restorative techniques. These placement techniques when used with proper attention to preparation design, adhesive protocol and finishing and polishing procedures, allow the clinician to successfully restore form, function and esthetics to the single anterior tooth replacement.

Adult↗
PubMedDate not supplied

Compomers, reattachment method expand restoration capabilities.

The purpose of this article is to review one new material and one new technique being used in restorative dentistry today. Compomers, new fluoride-releasing resin restorative materials, are compared to conventional glass ionomers in terms of classification, physical properties, and clinical usage. Compomers are not true glass ionomer materials since the acid/base setting reaction, charactheristic of conventional glass ionomers, does not occur. As a consequence, their physical properties of translucency, coefficient of thermal expansion, and strength more closely resemble composite resins than conventional glass ionomers. These differences in physical properties have clinical implications in their usage. In terms of new techniques, clinical and laboratory data now exist to support the method of reattachment of fractured tooth fragments using only dentin bonding agents, in cases where the tooth fragment is available. This method can restore up to 50 percent of the original strength of intact teeth. The technique advocates the use of acid etching and enamel and dentin bonding, without any tooth preparation. In vitro studies have achieved total (100 percent) restoration of intact teeth by bonding a porcelain veneer to the tooth after the reattachment.

Compomers↗
PubMedDate not supplied

Use of an intra-pontic attachment as cosmetic support for a removable appliance.

When using an introcoronal precision attachment in a combined Fixed and Removable Prosthodontic case, the retention and appearance can be greatly improved. When taking into consideration these advantages one must not forget the disadvantages and possible violation of the biological principles of tooth preparation. Because in order to obtain a restoration with adequate contours it is necessary to reduce a significant amount of tooth structure. In this case the attachment is used in a catelever pontic avoiding any excessive tooth reduction. In metal-ceramic restorations it is important that a glazed surface be achieved upon completion because it enhances material strength and reduces plaque retention. This clinical report presents a step-by-step procedure using an intra-pontic attachment as a retainer for a removable partial denture. The procedural sequence assures optimal marginal integrity and glazed porcelain surfaces upon completion. A post-solder technique is recommended to assemble multi-abutment metal ceramic fixed partial dentures.

Dental Abutments↗
PubMed1981

Potential for tooth fracture in restorative dentistry.

Increasing awareness of tooth fracture, both complete and incomplete, as a significant disease entity has led to improved diagnostic techniques. By using compact, easily handled, fiber optic instruments for transillumination and by developing a "predisposition index" to assist in the evaluation of fracture potential, new dimensions have been added in treatment planning, especially for older patients. Prevention of tooth fracture can best be accomplished by utilizing conservative, nontraumatic tooth preparation procedures, understanding predisposing factors, and using full occlusal coverage, circumferentially retained restorations whenever castings are indicated. Effective management of incomplete tooth fracture involves early recognition of the problem, appropriate and timely treatment, and a realistic assessment of the prognosis.

Dental Pulp↗
PubMed1987

Ceramics: their place in dentistry.

A transfer molded ceramic coping material, Cerestore, and a castable ceramic, Dicor, are commercially available for fabrication of all-ceramic crowns. The manufacturers indicate their use should be in single unit anterior or posterior crowns. Tooth preparations are similar and should have rounded lines angles to avoid sharp points which may cause stress concentration. The amounts of tooth reduction are also similar and range from 1.0 to 2.0 mm depending on the location of surfaces. There are variations in fabricating procedures but both involve heat treatment and special equipment. Cerestore requires eventual veneer build-up and shading. Dicor requires surface shading. Both are evaluated and classified by the Council on Dental Materials, Instruments and Equipment of the American Dental Association. At least three other ceramic systems are being developed but are not yet commercially available.

Aluminum Oxide↗
PubMed1985

Alteration of occlusal reduction of prepared abutment teeth subsequent to final impressions.

The technique presented can be used in complex restorative situations to alter the occlusal reduction of previously prepared abutment teeth to provide adequate space for restorative materials. The technique is accurate, inexpensive, easy to perform, and time saving. It allows the dentist to alter the tooth preparation precisely without inconvenience to the patient.

Dental Abutments↗
PubMed1983

Immediate, provisional postextraction pontic placement.

A rapid technique is described for placement of a temporary pontic to provide immediate esthetics after extraction of an anterior tooth. It requires no laboratory facilities, no natural tooth preparation, and uses only a few dental materials. Being functional and practical, it allows the patient time to seek further care from a general practitioner at a time convenient to them both. Additionally, the psychological distress associated with removal of an anterior tooth is minimized, if not eliminated. Because no natural teeth are involved with any dental preparations, further prosthetic treatment is not compromised. Addition of this technique to the surgeon's treatment regimen is cost effective, and it will improve the relationship between patient and surgeon.

Denture Design↗
PubMed1993

Integrating fixed and removable provisional restorations.

When both fixed and removable components are required, provisional restorations can be difficult. This article describes a technique where provisional restoration "shells" are made with a plastic stent of the diagnostic wax-up on lightly prepared teeth of a diagnostic cast. An acrylic removable partial denture is then waxed to the shells. The shells are relined intraorally after tooth preparation with the partial denture in place.

Denture Design↗
PubMed2006

Integration of composite and ceramic restorations in tetracycline-bleached teeth: a case report.

UNLABELLED: The success of an esthetic rehabilitation depends on the understanding of the patient's need and expectation. The management of patients with moderate to severe tetracycline-stained teeth is very challenging. Tooth whitening may be a valid alternative to more aggressive treatments; however, patients should be aware of the limitations of tooth whitening therapy. Clinicians may select differing treatment plans; tooth whitening can improve intrinsic discoloration in a way so that no further treatment is required. Once tooth whitening is completed, direct or indirect restorative procedures may be afforded to match the existing restoration with the bleached tooth structure. This article describes a conservative clinical approach to rehabilitate the smile of a patient with moderate to severe tetracycline-stained teeth using a combination of tooth whitening and direct composite and indirect porcelain restorations in the maxillary anterior segment. CLINICAL SIGNIFICANCE: The combination of tooth whitening and adhesive restorations allows clinicians a significantly more conservative approach to intrinsically stained teeth; tooth preparation for porcelain veneers and porcelain-fused-to-metal and full-ceramic crowns can be restricted to conditions in which persistent tooth discoloration or significant loss of both dentin and enamel exists.

Adult↗
PubMed1999

Bonding porcelain laminate veneer provisional restorations: An experimental study.

STATEMENT OF PROBLEM: Minimal tooth preparation is required for porcelain laminate veneers, but an interim restoration is anticipated by patients to protect their teeth against thermal insult, chemical irritation, and to provide esthetics. Cement remaining after the removal of the provisional restoration can impair the etching quality of the tooth surface and the fit and final bonding of the porcelain laminate veneer. PURPOSE: This in vitro study inspected the tooth surface for remaining debris from cement after removal of a provisional restoration. MATERIAL AND METHODS: Seventy-two extracted natural anterior teeth were prepared for porcelain laminate veneers. For half of the teeth, the smear layer was removed before luting provisional restorations. Veneer provisional restorations were fabricated and luted to teeth with 3 bonding methods: temporary eugenol-free cement, spot etching combined with dual-curing luting cement, and polyurethane adhesive combined with dual-curing luting cement. After removal of provisional restorations 1 week later, the tooth surface was examined for residual luting material with an SEM. RESULTS: Traces of cement debris were found on provisionally prepared teeth for all 3 material methods. CONCLUSION: The use of polyurethane adhesive combined with the dual-curing cement revealed significantly less teeth with debris than the other methods. This difference was less distinct when the smear layer was removed.

Acid Etching, Dental↗
PubMed1984

Using irreversible hydrocolloid to evaluate preparations and fabricate temporary immediate provisional restorations.

Two unique techniques that use irreversible hydrocolloid and an Omnivac matrix have been presented. The first technique is used to evaluate the adequacy and uniformity of the tooth preparation. The second technique is used to create a TIPR for the patient while the PIPR is being fabricated. The TIPR-PIPR system can be used to facilitate proper diagnosis, planning, and treatment; and it results in improved patient comfort, dentist efficiency, and increased control over the final restoration.

Colloids↗
PubMed1996

Effect of provisional luting agents on polyvinyl siloxane impression material.

Eugenol-containing cements have been traditionally selected for seating provisional restorations, but incomplete polymerization of polyvinyl siloxane impression materials has been attributed to these cements. This study clinically evaluated the inhibitory effect on polymerization of a specific polyvinyl siloxane impression material with five luting agents used for provisional restorations. Three of these luting agents contained eugenol, whereas two interim cements did not contain eugenol. A total of 60 human posterior teeth were prepared for complete crowns, fitted for provisional crowns, and cemented with interim luting agents. After 2.5 weeks the provisional crowns were removed, the cement on tooth preparations was removed with an explorer, and impressions were made. The results revealed that none of the luting agents in this investigation had an inhibitory effect on polymerization of polyvinyl siloxane impression materials.

Calcium Hydroxide↗
PubMed1977

Anterior fixed partial dentures utilizing the acid-etch technique and a cast metal framework.

A technique has been described which permits the fabrication and attachment of an anterior fixed partial denture without tooth preparation. The fixed partial denture is attached to the lingual surfaces of the abutment teeth utilizing a composite resin and acid-etched enamel. Conservation of tooth structure and minimal chair time and patient expense are the primary advantages of this technique.

Acid Etching, Dental↗
PubMed1999

An investigation of the variables which may affect the bond between plastic teeth and denture base resin.

OBJECTIVES: The failure of the bond between acrylic resin denture base material and resin teeth remains a significant problem. This study evaluated the tensile bond strength of specimens produced by commonly employed tooth preparation and processing methods as used in dental laboratories. METHODS: Twenty-two experimental groups, each consisting of 36 specimens, were investigated by subjecting the tooth-resin bond to tensile loading. The groups were allocated to one of five experimental sets to investigate: (a) effect of resin dough time, (b) effect of tooth surface condition, (c) effect of processing variables, (d) effect of monomer cementing, and (e) effect of acrylic resin cement. The results were analysed statistically using a one factor ANOVA and a Student t test. RESULTS: A significantly stronger bond was obtained when the resin was packed late in the dough stage, and a superior bond, in all cases, when high-impact resin was used. Tooth surface modification by grinding or grooving made no significant difference when compared with unmodified surfaces. Wax-contaminated surfaces produced highly significant weaker bonds. Time of introduction and duration of water-bath processing had no significant effect on bond strength. Monomer cementing of the tooth surface, especially with high-impact monomer. significantly improved the bond strength. The application of resin cements was found to produce the most significant increase in denture tooth bond strength. CONCLUSIONS: The important steps in obtaining a consistently high value denture tooth bond are thorough dewaxing of the tooth surface followed by the application of a suitable resin cement.

Acrylic Resins↗
PubMedDate not supplied

Clinical performance of a lithia disilicate-based core ceramic for three-unit posterior FPDs.

PURPOSE: The purpose of this research project was to determine the clinical success rate of a lithia disilicate-based core ceramic for use in posterior fixed partial dentures (FPD) as a function of bite force, cement type, connector height, and connector width. MATERIALS AND METHODS: Thirty ceramic FPD core frameworks were prepared using a heat-pressing technique and a lithia disilicate-based core ceramic. The maximum clenching force was measured for each patient prior to tooth preparation. Connector height and width were measured for each FPD. Patients were recalled yearly after cementation for 2 years and evaluated using 11 clinical criteria. All FPDs were examined by two independent clinicians, and rankings from 1 to 4 were made for each criterion (4 = excellent; 1 = unacceptable). RESULTS: Two of the 30 ceramic FPDs fractured within the 2-year evaluation period, representing a 93% success rate. One fracture was associated with a low occlusal force and short connector height (2.9 mm). The other fracture was associated with the greatest occlusal force (1,031 N) and adequate connector height. All criteria were ranked good to excellent during the 2-year recall for all remaining FPDs. CONCLUSION: The performance of the experimental core ceramic in posterior FPDs was promising, with only a 7% fracture rate after 2 years. Because of the limited sample size, it is not possible to identify the maximum clenching force that is allowable to prevent fracture caused by interocclusal forces.

Adult↗