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At least 271 records · Page 15Linked to original sources
PubMed2005

Immediate dentin sealing: a fundamental procedure for indirect bonded restorations.

UNLABELLED: The purpose of this article is to review evidence-based principles that could help optimize dentin bonding for indirect composite and porcelain restorations. More than 30 articles were reviewed, most of them addressing the specific situation of dentin bonding for indirect restorations. It appears that the combined results of this data plus clinical experience suggest the need for a revision in the dentin bonding procedure. Immediate application and polymerization of the dentin bonding agent to the freshly cut dentin, prior to impression taking, is recommended. This new application procedure, the so-called immediate dentin sealing (IDS), appears to achieve improved bond strength, fewer gap formations, decreased bacterial leakage, and reduced dentin sensitivity. The use of filled adhesive resins (low elastic modulus liner) facilitates the clinical and technical aspects of IDS. This rational approach to adhesion also has a positive influence on tooth structure preservation, patient comfort, and long-term survival of indirect bonded restorations. CLINICAL SIGNIFICANCE: Tooth preparation for indirect bonded restorations (eg, composite/ceramic inlays, onlays, and veneers) can generate significant dentin exposures. It is recommended to seal these freshly cut dentin surfaces with a dentin bonding agent (DBA) immediately following tooth preparation, before taking impression. A three-step total-etch DBA with a filled adhesive resin is recommended for this specific purpose. The major advantages, as well as the technical challenges of this procedure, are presented in detail.

Dental Bonding↗
PubMed1980

Articulation of posterior quadrant impressions for cast restorations.

The described procedure provides the dentist with a simple articulation method to reduce chair time and consumption of materials while maintaining accuracy and reliability. This uncomplicated technique should be used only when occlusal equilibration is not necessary, when there are vertical stops after tooth preparation, and when the tooth to be prepared is not involved in lateral excursions.

Crowns↗
PubMed1993

Alternatives to posterior complete crowns: integrating foundations with cuspal protection.

A common approach for restoring compromised posterior teeth is to reconstruct the missing anatomic crown with a dental restorative material and prepare the remaining tooth structure for an artificial veneer. Because this procedure is also compounded by designing subgingival finish lines for tooth preparations, a conservative approach for the fabrication of one-piece castings is suggested that incorporates both foundations and cuspal protection, with finish lines prepared above the gingival crest. Patient selection, advantages, disadvantages, and armamentarium are discussed.

Acrylic Resins↗
PubMed1994

Improving interproximal access in direct provisional acrylic resin restorations.

A new technique that improves interproximal access in direct provisional acrylic resin restorations is presented. In this technique a clear Mylar strip is placed interproximally and lifted off with an overimpression prior to the beginning of the tooth preparation procedures. Preparation of the tooth and fabrication of the provisional restorations then continues in the usual direct manner. The Mylar strip, now embedded in the overimpression, becomes incorporated as a separator between the adjacent provisional restorations. The acrylic resin provisional restorations are easily snapped apart and finished individually. The advantages of the technique and the need for marginal perfection around the full perimeter of the tooth are also discussed.

Acrylic Resins↗
PubMed2000

Improving the quality of fixed prosthodontic services.

I have discussed only the three problems most frequently mentioned by laboratory technicians in the Lab Management Today survey. In my opinion, there are many more areas in fixed prosthodontics that need attention. To achieve this, we must improve the quality of the procedures we use in creating fixed prostheses. Laboratory technicians observe the quality of impressions, tooth preparations and interocclusal records that are sent to them by the dentists with whom they work. Their statements about the need for improvement on several of the aspects of the clinical procedure are of concern. It is dentists' professional responsibility to upgrade their clinical techniques so that they produce high-quality impressions of adequate tooth preparations and transfer information about the proper interocclusal relationship to the dental technician.

Dental Impression Technique↗
PubMed1990

[The influence of the home position operator's posture on the prepared abutment contour of jacket crown--the maxillary right central incisor].

The abutment teeth preparation with jacket crown for the maxillary right central incisor was prepared in Home Position. The following are the result of a study made on the influence to the prepared tooth form. The operators were five dentists who had 2-4 years clinical experiences and were made to prepare with 1.0 mm width shoulder. 1. The reduction of incisal edge was like the indication. 2. As for the subgingival reductions, the proximal surfaces were deep and the facial and lingual surfaces were shallow. 3. As for the degree of axial taper, angles of convergence were comparatively like the indication, and prepared teeth were inclined to distal direction for imaginary axis of tooth crown before operation. 4. The width of shoulder were insufficient except at the facial surface. 5. The surface roughness on axial wall was almost acceptable, but the roughness on shoulder was sufficient at facial surface, while insufficient at others. 6. As for Rough Value, smoothness of curve on finishing line was questionable. 7. Tooth preparation of maxillary anterior teeth in Home Position, compared with posterior, is fairly easy to operate under mirror view, and the method is stable and available.

Crowns↗
PubMed1986

Effect of die spacer on the seating of complete cast gold crowns with grooves.

Fifty crowns were constructed with an indirect technique for a standardized Ivorine tooth preparation to determine whether casting relief would improve the seating of complete cast crowns with zinc phosphate cement. The variables were two grooves in the preparations and die spacer casting relief of approximately 20 to 40 micron. The tooth preparations of two groups had no grooves, but castings were made with internal relief for only one group. Three groups had buccal and lingual grooves in the preparation. One group had no relief, a second group had complete relief, and a third group had relief but not in the grooves. The discrepancies noted before and after cementation of the castings were measured. The average discrepancy for each group and the significance between groups was determined. Results of this study demonstrated the following. Die relief significantly improved the seating of complete cast-gold crowns with or without grooves. Omitting die spacer from grooves did not reduce the benefits of relieving the remainder of the die. Partial internal relief was better than no relief. The grooves did not disrupt seating when die spacer application was complete or specifically omitted from the grooves alone.

Crowns↗
PubMed2000

Irrigation rates and handpieces used in prosthodontic and operative dentistry: results of a survey of North American dental school teaching.

PURPOSE: A data baseline on dental cutting methodologies was established by means of a survey of North American dental school teaching. MATERIALS AND METHODS: Sixty-four North American dental schools were surveyed regarding their recommendations on handpiece usage and coolant flow rates in fixed prosthodontics and operative dentistry. RESULTS: High-speed handpieces were the instruments of choice for tooth preparation in fixed prosthodontics. In operative procedures, recommendations for sole use of the high-speed, the low-speed, or both handpiece types were more uniform. CONCLUSIONS: North American dental schools advocate greater use of high-speed than low-speed handpieces. Although the use of high-speed handpieces predominate in schools in Canada and Puerto Rico, there is a proportionately higher use of low-speed handpieces than in US dental schools. Few (approximately 1 in 5) schools made recommendations on coolant flow rates during cutting procedures.

Canada↗
PubMed1999

Effect of tooth surface roughness on marginal seating and retention of complete metal crowns.

STATEMENT OF PROBLEM: Retention and marginal adaptation factors have major influence on the failure of cemented complete veneer crowns. PURPOSE: This study investigated the effect of axial surface roughness on the marginal seating and retention of silver-palladium crowns luted with zinc phosphate, glass ionomer, and resin cements. MATERIAL AND METHODS: Coarse and fine diamond stones were used to create various surface roughnesses of premolars. A milling machine was used to control the height and angle of the axial walls of tooth preparations. Ten cast metal crowns in 6 subgroups were luted with 3 cements (Phosphacap, Fuji Cap I, and Panavia 21). Marginal seating was recorded with a Digimatic indicator. Retention was determined by measuring the tensile force required to remove a metal crown with a Lloyd testing machine. RESULTS: Two-way analysis of variance revealed statistically significant differences (P <.001) in retention for both luting cements and surface roughness. No significant difference was recorded for marginal seating relative to roughness (P =.860) and interaction effects (P =.204). Tukey-HSD tests revealed substantial differences in retention among Phosphacap, Fuji Cap I, and Panavia 21 cements. Significant differences were not confirmed in marginal seating between Fuji Cap I and Phosphacap cements with coarse diamonds, and Phosphacap and Panavia 21 cements with fine diamonds. CONCLUSIONS: The best retention for complete metal crown was demonstrated for tooth preparations ground with coarse diamonds and cemented with Panavia 21 cement. Differences in axial surface roughness had no effect on the marginal seating of the complete metal crowns.

Analysis of Variance↗
PubMed2004

Fracture resistance of re-attached coronal fragments--influence of different adhesive materials and bevel preparation.

The purpose of this study was to investigate the fracture resistance of re-attached coronal fragments of teeth using different materials and tooth preparations. Seventy-two recently extracted bovine incisors were selected. Eight incisors were maintained without any preparation as a control group. The incisal third of the other teeth was sectioned using a diamond saw. In one group (n = 32), a 2-mm bevel was prepared, whereas in the second group no preparation was made (n = 32). The specimens (beveled and non-beveled) were divided in four groups (n = 8) and re-attached with the following materials: a dual-cured resin cement RelyX ARC (RX); a chemically cured composite Bisfil 2B (B2); a light-cured composite Z250 (Z2); and a one-bottle adhesive Single Bond (SB). The bevel region was restored with adhesive and composite. All materials were used according to manufacturer's directions. A light-curing unit was used to polymerize the materials. Specimens were stored in saline solution for 72 h. De-bonding procedures were performed in a testing machine with cross-head speed of 0.6 mm min(-1). The load was applied in the incisal third. The resistance to fracture for control group was 70 (7) kg. The fracture resistance for non-beveled and beveled specimens were: SB, 3.3 (2.4) and 17.0 (4.1); RX, 11.5 (3.0) and 16.3 (3.1); Z2, 14.4 (4.2) and 20.5 (1.7); and B2, 19.5 (3.5) and 32.5 (7.4) kg. Analysis of variance (anova) and Fisher's protected least significant difference (PLSD) test disclosed significant influence for materials and cavity designs (P = 0.001). The highest failure loads were obtained with the B2 group and then with the Z2 with either bevel or non-bevel. RX produced lower failure loads than the restorative composites. The lowest failure load was obtained with SB in the non-beveled group. No technique studied was able to attain the fracture resistance of the control group and both materials and tooth preparation influenced the fracture resistance.

Analysis of Variance↗
PubMedDate not supplied

Microscopic evaluation of the interface between glass-ionomer cements and tooth structures prepared using conventional instruments and the atraumatic restorative treatment (ART) technique.

OBJECTIVE: The purpose of this study was to evaluate the effect of cavity preparation using hand instruments and conventional rotary instruments on the bonding of glass-ionomer cements to formerly carious teeth. METHOD AND MATERIALS: In 2 experimental groups (12 teeth each with primary caries) caries was removed and cavities prepared using hand instruments according to the atraumatic restorative treatment (ART) technique or conventional rotary instruments. In the control group (12 caries-free teeth) Class 1 cavities were prepared using conventional instrumentation. Cavities in all teeth were restored with 1 of the commercial glass-ionomer cements designed for use with the ART technique, either Fuji IX (GC) or Ketac Molar (3M Espe). After 21 days of storage in physiologic saline at 37 degrees C, 3 400-microm-thick slices from each tooth were stained using the Mallory method and evaluated using a light transmitting microscope. RESULTS: In all samples, a region of interaction was observed between the cement and dentin and enamel. However, the interface in teeth from which caries had been removed was different from that in the control group. All were stained using Mallory staining, but only teeth which had been carious showed coloration. No differences were found in intensity of color or appearance between the cavity preparation techniques. CONCLUSION: The occurrence of caries in a tooth alters the bonding behavior of glass ionomers to that tooth. The method of caries removal (ART or conventional preparation) does not influence the quality of the interface between a glass ionomer and either dentin or enamel.

Acids↗
PubMedDate not supplied

A literature-based overview of the preparation of teeth.

This column has discussed only a few highlights of tooth preparation. Any degree of success is difficult without proper positioning for the operator, patient, and assistant. There are many other aspects to preparation of teeth; these will be discussed in future restorative columns.

Ergonomics↗
PubMed2002

Use of heat-pressed, leucite-reinforced ceramic on anterior and posterior onlays: a clinical report.

The introduction of new techniques and materials in all-ceramic systems, together with improvements in resin bonding agents, has enabled the use of resin cements to directly bond ceramic crowns, veneers, and inlays/onlays to conservative tooth preparations. Directly bonded ceramic onlays can eliminate the need for conventional means of retention and allow the restoration of lost tooth structure with minimal tooth preparation. This article presents the use and short-term clinical performance of directly bonded, heat-pressed, leucite-reinforced ceramic onlays in both anterior and posterior areas of the mouth.

Acrylates↗
PubMed1990

Effect of endodontic access preparation on resistance to crown-root fracture.

This investigation involved the creation of coronal-radicular fractures in vitro and compared the fracture resistance of intact human mandibular molars, with molars after varied tooth preparation. Forty freshly extracted, non-carious, nonrestored human mandibular molars were randomly divided into four treatment groups. The molars were subjected to constantly increasing occlusal load until coronal-radicular fracture occurred. Tooth preparations significantly diminished resistance to coronal-radicular fracture.

Dental Pulp↗
PubMed1998

Porcelain for veneers.

An ideal porcelain veneer placed on a non-discolored tooth requires the least amount of tooth preparation and the use of a translucent porcelain that interferes minimally with the transmission of light. In contrast, veneering a discolored tooth requires additional tooth preparation and the use of a chromatic or opacious porcelain. This article discusses several criteria for the selection of porcelain for porcelain veneers, including some steps to enhance the esthetic properties of these restorations.

Dental Porcelain↗
PubMed2005

Restoration of the root-filled tooth: pre-operative assessment.

This is the first in a series of four papers related to the management of root canal treated teeth. When teeth compromised by extensive restorations become non-vital, suggestions have been given as to how root canal treatment can be carried out with the greatest chance of success. Once root canal treated, either by a previous dentist or by the current dentist, a review of the assessment process that should be carried out prior to placing costly indirect definitive restorations is given. It will be clear that post-retained restorations are mainly reserved for anterior or single-rooted teeth, posterior teeth rarely requiring a post for core retention. The second paper in this series describes the basic tooth preparation that should be carried out prior to placing a post. Depending on the type of post system used, further modifications to tooth preparation may be required and the cementation techniques may also have to be modified. The third paper therefore discusses the various post types, when and how they should be used for optimum results. The final paper addresses reinforcement and restoration of compromised root canals, such as those with immature, open apices, or those that have been over-prepared for previous post-retained restorations.

Dental Restoration, Permanent↗