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Results for “Tooth Preparation”

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At least 1,297 records · Page 72Linked to original sources
PubMed1998

Dentin-bonded all-ceramic crowns: current status.

Dentin-bonded all-ceramic crowns employ contemporary techniques to lute the crown to the tooth using a resin luting material and dentin-bonding system. The advantages of these crowns are that they provide good esthetics and fracture resistance and can be used in cases of substantial tooth loss. Their principal disadvantages are that the luting procedure is more time-consuming and that these crowns should not be used where margins are subgingival. Dentin-bonded all-ceramic crowns may be a useful addition to the dentist's armamentarium, but long-term clinical studies are needed to fully assess their performance.

Contraindications↗
PubMed2000

Using a modified subopaquing technique to treat highly discolored dentition.

BACKGROUND: The objective of esthetic dentistry is to treat diverse problems and achieve natural-appearing results. The author reviews the issues involved in the discoloration of human dentition and the concerns associated with current treatment for this problem. Understanding the proper use of materials in esthetic dentistry can result in a conservative, natural-appearing restoration. OVERVIEW: Dentition discoloration due to intrinsic staining can be a severe esthetic problem. Current treatment using crowns and highly opaque porcelain veneers has inherent disadvantages in regard to the final restorations. The author explores a subopaquing technique that allows for progressive lightening of highly stained teeth to create natural color depth in a conservative porcelain veneer procedure. CLINICAL IMPLICATIONS: In treating dental problems, the clinical practitioner looks for solutions that conserve tooth structure. To achieve natural-appearing esthetic results, it is important for the practitioner to be aware of technological advances in materials science as well as the proper use of esthetic dental techniques. Understanding the problems associated with dental discoloration and ways of correcting them will allow the practitioner to solve these moderate-to-severe esthetic problems on a consistent basis.

Adult↗
PubMed2002

Clinical evaluation of fiber-reinforced fixed bridges.

BACKGROUND: This study evaluated the clinical performance of 39 light and heat polymerized fixed partial bridges made with a substructure of preimpregnated, unidirectional fiber-reinforced composite, or FRC, veneered with a hybrid particu late composite. METHODS: The authors evaluated 22 extracoronal, full-coverage retainer prostheses and 17 intracoronal, partial-coverage retainer prostheses placed over a 37-month period. All substructures initially were fabricated with a low-volume FRC. The authors reevaluated this design after early failures occurred, leading to a substructure with a higher volume of FRC. All prostheses were assessed for surface integrity, anatomical contour, marginal integrity and structural integrity at several intervals. RESULTS: The data show that survival was associated primarily with substructure design volume. When patients with severe parafunctional habits were excluded, the survival rate was 95 percent for prostheses made with a high-volume substructure (survival range, 2.77 to 4.30 years; mean +/- standard deviation survival, 3.75 +/- 0.4 years). Retainer configuration did not have a statistically significant influence on clinical survival. For all surviving prostheses, the authors observed few changes in any clinical parameters from baseline to 48 months. A loss of surface luster was observed in the majority of cases. Repairable surface defects were detected on two prostheses at 24 months. Scanning electron microscopic analyses indicated no exposed fibers on the occlusal surface and minimal wear. CONCLUSIONS: This study shows that a unidirectional, preimpregnated FRC can be used successfully to make bridges of variable retainer designs that last up to four or more years when a high-volume substructure is used. CLINICAL IMPLICATIONS: Short-span polymer prostheses made with particulate composite and unidirectional glass FRC can be used in certain clinical situations in which a metal substructure is not desired.

Composite Resins↗
PubMed2002

Root tips.

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Dental Instruments↗
PubMed2005

What has happened to conservative tooth restorations?

There is an obvious tendency in dental practice to place more full crowns than may be necessary. This article has discussed some of the reasons for this increased use of full crowns, and for a reduction in the use of full crowns. I have supported the desirability of placing more conservative restorations, and I have discussed the financial and longevity implications offered by more conservative restorative dentistry.

Crowns↗
PubMed2005

The clinical significance and management of apical accessory canals in maxillary central incisors.

BACKGROUND: The maxillary central incisor is considered to be the least difficult subject for a clinical endodontic experience. However, the internal anatomy of maxillary central incisors can present a number of variations, including multiple accessory canals. CASE DESCRIPTION: This article highlights the clinical significance and management of accessory canals located in the apical one-third of maxillary central incisors. The authors present two case reports in which failure to detect the accessory canals led to root canal failure and subsequent surgical intervention. Another two case reports present the serendipitous discovery and nonsurgical management of accessory canals during the initial treatment of maxillary incisors. CONCLUSIONS AND CLINICAL IMPLICATIONS: It is important for the clinician to be able to detect the signs suggesting the presence of accessory canals in maxillary central incisors. Failure to do so may lead to a less-than-optimal endodontic treatment outcome.

Adult↗
PubMed2006

Facing the challenges of ceramic veneers.

Ceramic veneers are extremely popular and have been used for many years. In spite of their phenomenal success, they offer numerous challenges during service. In this column, I have identified and discussed several degenerative situations commonly observed, and I have described methods of preventing or reducing the problems. When properly placed, ceramic veneers are among the most beautiful and long-lasting of all dental restorations.

Ceramics↗
PubMed2006

A retrospective clinical evaluation of two-unit cantilevered resin-bonded fixed partial dentures.

BACKGROUND: The authors conducted a study to examine the clinical performance of two-unit cantilevered resin-bonded fixed partial dentures (RBFPDs) that were inserted at The Prince Philip Dental Hospital, University of Hong Kong. METHODS: The authors recalled patients who had received two-unit cantilevered RBFPDs at least 24 months before the recall examination. The authors recorded the following data: patient's sex and age, operator's experience, prosthesis cementation date, endodontic treatment if performed, bone support, tooth mobility, the presence of shim-stock contacts on the abutment or pontic in intercuspal position, and the presence of aproximal axial contacts adjacent to the prosthesis. They also recorded the date of any debonding with subsequent treatment. They asked the patients qualitative questions about their prostheses. RESULTS: A total of 269 prostheses were placed in 214 patients and had a mean service life of 51.7 months +/- 19.5 months standard deviation, with a range of 13.2 to 141.6 months. Of 14 failed prostheses, 12 debonded, resulting in a success rate of 94.8 percent and clinical retention rate of 95.5 percent. No discernable rotation or drifting of the abutments was apparent in any of the prostheses. Overall patient satisfaction with RBFPDs was good, with an average assessment score of 8.5. CONCLUSIONS: The authors observed a 95.5 percent clinical retention rate of 269 two-unit RBFPDs, with no apparent drifting of the abutments. Longer-term follow-up studies are required. CLINICAL IMPLICATIONS: Two-unit RBFPDs are conservative and clinically retentive prostheses in the short to medium term.

Adolescent↗
PubMed2006

Veneer mania.

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Attitude of Health Personnel↗