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At least 1,045 records · Page 58Linked to original sources
PubMed1995

Reducing marginal flash in the fabrication of direct provisional restorations: a new technique using light-cured resin and transparent silicone.

The optimum placement of bonded indirect restorations depends to a large extent on establishing and maintaining the patient's gingival health during the provisional treatment phase, as inflamed sulcular tissues may compromise subsequent isolation efforts. Gingival health is best achieved by providing provisional restorations of correct emergence profile and accurate margination. This paper introduces a fully-cured direct provisionalization technique that minimizes marginal flash and improves the accuracy of the restoration in a fraction of the production time needed for traditional direct techniques requiring remargination. The technique, which relies on the use of a unique transparent over-impression registration material and visible light-curing provisional composite resin, is described in a case report.

Adult↗
PubMedDate not supplied

Marginal accuracy of provisional restorations fabricated by different techniques.

Provisional restorations were fabricated on a cast metal model and the resulting marginal discrepancies were measured. In the control group, the restorations were fabricated directly on the die and no coolant was applied. Five other methods of fabricating provisional restorations were evaluated. The mean marginal discrepancies were as follows: Control = 0.228 mm, In Situ (control plus coolant) = 0.196 mm, Removal (removed from die to polymerize) = 0.403 mm, On/Off (repeated removal/replacement) = 0.601 mm, Reline = 0.074 mm, and Indirect = 0.161 mm. The mean marginal discrepancy for the On/Off technique was significantly greater than that for all other techniques. The mean marginal discrepancy with the Removal technique was significantly greater than that with the Control, In Situ, Reline, and Indirect techniques. No significant differences were found between the Control, In Situ, Reline, and Indirect techniques.

Analysis of Variance↗
PubMedDate not supplied

[The quantitative determination of dentinal fluid during the treatment of deep caries].

A method for dentin fluid measurements has been developed permitting an indirect judgement on remineralizing effect of drugs. The study was carried out in 36 teeth of 23 patients. Hydroxyapatite, tricalcium phosphate, and, as a reference agent, calmecin were used in the treatment of deep caries. A reliable remineralizing effect of hydroxyapatite and tricalcium phosphate was revealed.

Adolescent↗
PubMed1994

Pulpal response after complete crown preparation, dentinal sealing, and provisional restoration.

This study evaluated the acute pulpal healing response following preparation, etching, and sealing of the prepared vital dentin with a 4-methacryloxyethyl trimellitate anhydride (4-META) bonding system. Adult monkey teeth received crown preparations with chamfer margins, prepared with a diamond used at ultra high speed with water cooling. Vital dentin was etched with 10% citric acid-3% ferric chloride, rinsed, and sealed with 4-META system. A provisional crown was formed with a low-viscosity light-curing adhesive resin. Teeth were fixed and evaluated histopathologically. Pulpal responses at 3 days showed only minimal disruption of the odontoblastic zone. At 7 days, the pulps presented reorganizing odontoblastoid cells, and, at 10 days, the pulps showed new odontoblastoid cells with a thin rim of reparative dentin. Pulps of crown preparations that were etched and then sealed with the 4-META system presented healing patterns similar to those of pulps associated with Class V preparations lined with calcium hydroxide, observed in (previous) similar studies.

Acid Etching, Dental↗
PubMedDate not supplied

Achieving interdental integrity in resin-bonded posterior ceramic restorations.

Increased physical strength of ceramic materials and increased bond strength now make it feasible to use these materials in the posterior area, and these restorations are aesthetic to the point of being virtually indistinguishable from natural teeth. These restorations are more technique-sensitive, and the restrictive anatomical proximities present an additional challenge, requiring meticulous attention to preparation, impression, temporization, fabrication, and cementation procedures. The health of the tissues investing and supporting the teeth has long been accepted as essential. The learning objective of this article is to share the knowledge gained in clinical experience with other clinicians.

Dental Marginal Adaptation↗
PubMed1993

The In-Ceram metal free ceramic system for fixed prosthodontics.

The recent return of interest to Porcelain Jacket Crowns has been accompanied by the development of improved ceramic systems for their fabrication. One such system, In-Ceram, uses an interesting variation of the aluminous porcelain (Vitadur Alpha). It is important to realise the requirements for tooth preparation so that long lasting restorations may be produced. This article endeavours to present a method for preparation which is both efficient clinically and satisfies the physical requirements for this type of metal-free ceramic procedure.

Aluminum Oxide↗
PubMedDate not supplied

Bond strength of light-cured glass ionomers to carious primary dentin.

The pre-cooperative or handicapped child with decay presents a special challenge to the practitioner and may require sedation or general anesthesia. Treatment with an interim restoration may delay treatment until the child is more mature and can accept dental treatment and is a more conservative approach than sedation, extractions or general anesthesia. Glass ionomer materials have been utilized for this application, but little is known about their retention to carious dentin. The purpose of this study was to determine whether the presence of artificial dentin decay will affect the shear bond strength of two light-cured glass ionomer materials. VariGlass and Vitrebond glass ionomer materials were attached to carious and non-carious primary dentin surfaces and bond strengths determined. There were no significant differences in shear bond strengths between the decayed and non-decayed surfaces [p < or = .001]. VariGlass had higher shear bond strengths than Vitrebond only after a pre-treatment with the PAA containing liquid. Pre-treatment with the liquid provided with each light-cured glass ionomer was beneficial in all instances except for Vitrebond on non-decayed surfaces.

Acid Etching, Dental↗
PubMed1996

Dual application of dentin bonding agents: effect on bond strength.

PURPOSE: To evaluate the effect of a dual application of dentin bonding agents (DBA) on their shear bond strength on dentin with intermediate application of a provisional cement. MATERIALS AND METHODS: Freshly prepared flat dentin surfaces of human teeth were coated with a first layer of one of various dentin bonding agents (All-Bond 2, ART Bond, Syntac or an experimental DBA called P-Bond). After curing the DBA, a provisional cement (Temp Bond, Freegenol or Fermit, a soft provisional diacrylate) was applied to the bonded dentin surface. After 24 hours, the provisional cement was removed and the dentin surface scrubbed with pumice. A second application of the same DBA together with a composite cylinder followed. After curing and 1,500 thermal cycles with constant imitation of intrapulpal pressure, shear bond strengths were measured. RESULTS: Compared to a single application of dentin bonding agents following Temp Bond treatment (SBS in MPa: Syntac: 0.86 +/- 1.75, ART Bond: 0.26 +/- 0.47, P-Bond: 14.90 +/- 4.51) application of DBAs prior to use of Temp Bond as well as after its removal seems to be very beneficial to shear bond strength values (SBS in MPa: Syntac:13.36 +/- 4.70, ART Bond: 16.34 +/- 5.02, P-Bond: 19.04 +/- 2.01). Independent from the provisional cement, the values after serial application of P-Bond provided consistently high bond values which were not statistically different (Kruskal-Wallis, P > 0.05) from values of P-Bond on fresh dentin (18.19 +/- 2.29 MPa). The only exception from these findings in the present study was All-Bond 2. Regardless of the provisional materials used, the bond strength values of All-Bond 2 remained low (maximum SBS with Fermit as intermediate provisional cement: 4.63 +/- 2.91 MPa).

Cementation↗
PubMed1996

Treatment of complex traumatic anterior dental injuries: a pediatric case report.

Traumatic injuries of permanent teeth in children present complex challenges. Growth and development influences, orthodontic considerations, and unknown endodontic and periodontal sequelae preclude immediate intervention with long-term restorations. "Interim" solutions are required to return the patient to the normal appearance, function, and health of the dental/alveolar complex until maturation of the patient allows long-term treatment planning. This report outlines diagnosis and treatment of multiple injuries, sustained by the maxillary anterior teeth. Step-by-step clinical procedures and their rationale are described. The learning objective of this case report is to outline the principles for management of traumatic injuries of permanent anterior teeth in young patients and to demonstrate clinical techniques for splinting displaced teeth, bonding fractured teeth, providing endodontic therapy, and fabricating adhesively bonded resin composite restorations for interim full coverage of severely damaged permanent incisors in a child.

Bicycling↗
PubMed1996

The relationship of the guided gingival frame to the provisional crown for a single-implant restoration.

This article discusses and defines the use of the provisional crown to encourage gingival growth to provide an ideal frame for a single-tooth implant prosthesis. Both the rationale and the technique are presented. The successful use of an osseointegrated implant to support a fixed prosthesis is an accepted treatment modality in both the biologic and clinical dental communities. The clinical examination, the radiographic survey, and diagnostic casts all contribute to achieving an optimal esthetic result, but the final image may continue to be elusive until the healing of the second-stage surgery when the gingiva can be evaluated. The gold standard of success is providing an inconspicuous result.

Crowns↗