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At least 1,477 records · Page 82Linked to original sources
PubMed1999

[Electronic determination of the length of the root canal].

The endpoint of an endodontic treatment must be situated at the cemen-to-dentinal junction to preserve the biological potential of the periapical area and to realize a complete disinfection of the principal root canal system. Thus, the determination of working length is a crucial factor in endodontic therapy. The conventional radiographic method cannot provide the accurate location of the apical constriction. For this reason, the electronic apex locators have been developed. Now, the last generation of apex locators has become more sophisticated and the electronic measurements seem to be accurate and reliable with electrolytic solutions in the canal.

Dental Pulp Cavity↗
PubMed1999

[Pitfalls to avoid in the cleaning and shaping of the pulp canal].

Chemomechanical instrumentation of the root canal system is without doubt the most important but most challenging part of endodontic treatment. The first essential in cleaning and shaping is gaining direct access to the root canals. A properly prepared endodontic access opening can eliminate many of the technical problems encountered in root canal treatment. Excessive calcification in the root canal system and performing root canal treatment through existing artificial crowns however can be a challenge for the clinician. Secondly, enlargement of a curved root canal often results in loss of working length, incomplete removal or extrusion of the root canal content and unwanted alterations in the canal shape, such as transportation (stripping, zipping, elbow formation), ledge formation and perforation. This article focuses on the causes and effects of procedural errors during root canal cleaning and shaping. Each of these complications is addressed in a manner designed to prevent problems rather than to manage them once they are recognized. Throughout the immense amount of literature published the last 30 years on this topic, concensus is obtained concerning the preferential procedure of cleaning and shaping the root canal.

Crowns↗
PubMed2003

How direct bonding satisfies an esthetic need.

The patient was more than satisfied with his appearance and with the cost of the procedure. After the wedding, he was ready to begin a more conventional series of treatments with orthodontia. Within the past several years, we have significantly progressed in our ability to provide complete in-office, long-term comprehensive dentistry. This article was written to help dentists visualize the potential of both materials and techniques for direct, in-mouth restorative dentistry. As more composites or composite replacement materials become available, practitioners will learn to perform direct-placement techniques even more skillfully. The majority of patients appear to covet white, bright teeth--sometimes to a degree that is beyond their normal color. This patient was no different. As a dentist, I have learned to give in to patients' demands. After all, it is their teeth.

Adult↗
PubMed2002

CAD/CAM systems, materials, and clinical guidelines for all-ceramic crowns and fixed partial dentures.

Advances in dental ceramic materials and the development of computer-aided design/computer-aided manufacturing (CAD/CAM) and milling technology have facilitated the development and application of superior dental ceramics. CAD/CAM allows the use of materials that cannot be used with conventional dental processing techniques. This article reviews the main techniques and new materials used in dentistry for CAD/CAM-generated crowns and fixed partial dentures. Also covered are the clinical guidelines for using these systems.

Aluminum Oxide↗
PubMed2002

Exploring evolutions in dental handpieces.

The introduction of a variety of contemporary esthetic and restorative materials has resulted in numerous improvements in the techniques employed throughout the entire restorative process that were historically taught in schools. As a result, the equipment designs and hand instrumentation have evolved to offer clinicians higher efficiency and better physical delivery of quality dental care.

Crowns↗
PubMed2003

All-ceramic primary telescopic crowns with Cerec inLab.

On the one hand, all-ceramic primary telescopic dentures serve to satisfy the growing esthetic needs of older patients, and on the other hand guarantee good adhesive stability. With the aid of the Cerec inLab system, primary telescopic crowns made of Vita In-Ceram infiltration ceramic can be designed and milled after previous conventional determination of the over all insertion direction. The raw crowns gained in this way then require only minor improvement. The secondary parts are produced with the aid of electroforming. These are adhesively bonded to the tertiary structure. The special feature of adhesive bonding of the primary telescopic crowns requires uncompromisingly good cooperation between dentist and laboratory.

Aluminum Oxide↗
PubMed2003

[The direct composite veneer restoration].

The direct composite veneer restoration is a minimal invasive tooth-saving and relatively cheap technique suitable to improve the esthetics of the dentition in many cases. In this article factors in influencing the selection of materials are discussed. Furthermore, advantages and disadvantages of the direct composite veneer are listed and some cases are presented.

Composite Resins↗
PubMedDate not supplied

Comparison of the marginal fit of Procera AllCeram crowns with two finish lines.

PURPOSE: The purpose of this study was to determine the influence of two finish line configurations on the marginal accuracy of Procera AllCeram crowns. MATERIALS AND METHODS: Twenty mechanized specimens of brass were fabricated for complete-coverage crowns. Two finish line designs were used: chamfer and rounded shoulder. AllCeram crowns were fabricated, and the fit of the crowns to the dies was recorded from the buccal and lingual margins. An image-analysis program was used to measure the gap. The results were subjected to statistical analysis using a Student's t test for separate samples and Student's paired t test. RESULTS: No significant differences were observed between the buccal and lingual measurements. When the values of the buccal and lingual measurements were averaged, there were no significant differences in the marginal gap, horizontal discrepancy, or internal adaptation of the axial wall, but there were significant differences in the vertical discrepancy, absolute marginal discrepancy, and internal discrepancy between the two finish line designs. CONCLUSION: The marginal gap was within the range of clinical acceptability. Some of the variables were influenced by the two finish lines tested.

Aluminum Oxide↗
PubMedDate not supplied

The effectiveness of bonded composite restorations in the treatment of painful, cracked teeth: six-month clinical evaluation.

This study investigated the clinical efficacy of a bonded resin composite restoration with and without cuspal coverage for the treatment of painful, cracked teeth. Patients in a private dental practice who presented with complaints were selected. Inclusion criteria were sensitivity to cold, biting and a clinically-visible crack after removal of the existing restoration. All 40 teeth were restored with a three-step total etch system (Phosphoric acid/Clearfil SA primer/PhotoBond), 20 with cuspal coverage and 20 without. Patients were interviewed at one week, five weeks and six months regarding the presence of pain. In addition, the teeth were clinically examined after six months to reveal any sensitivity. At one week, patients reported that 12 teeth (30%) were free of pain and 28 teeth (70%) still had symptoms. At five weeks, patients reported that 25 teeth (62.5%) were free of pain and 13 teeth (32.5%) still had symptoms. Two teeth (5%) needed endodontic treatment after two and five weeks. At six months, patients reported that 30 teeth (75%) were functioning without any complaints. Upon clinical examination, only 20 teeth (50%) were free of symptoms. No statistically significant difference between the results of the teeth treated with and without cuspal coverage could be shown (Fischer's exact test at p<0.05).

Adult↗
PubMedDate not supplied

Influence of margin design and taper abutment angle on a restored crown of a first premolar using finite element analysis.

PURPOSE: The purpose of this study was to determine the influence of margin design and taper abutment angle on the stresses developed in all-ceramic first premolar crowns. MATERIALS AND METHODS: Four margin designs and three taper abutment angles were independently incorporated into models examined by finite element analysis. A 600-N force was applied vertically downward. RESULTS: The taper abutment angle had a significant influence on the greatest peak tensile maximum principal stresses (sigma11) in the coping (16.8% change in stress for an 8-degree variation in taper angle). The margin design had significant influence on the highest peak tensile sigma11 in the dentin (60% difference in stress between designs) and lesser significance in the cement (30%). All calculated values of the highest peak tensile sigma11 were considerably lower than the fracture strengths of the respective materials in which the stresses resided. CONCLUSION: A smaller taper abutment angle and a larger chamfer radius (equivalent to the modified light chamfer) are recommended to reduce the magnitude of the greatest peak tensile sigma11 based on the finite element modeling conducted.

Bicuspid↗