SEARCH · Search PubMed

Results for “Tooth Preparation”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

SourceResearch connectionFrom yearThrough year

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 379 records · Page 21Linked to original sources

PubMedDate not supplied

Assessing the quality of clinical procedures and technical standards of dental laboratories in fixed partial denture therapy.

PURPOSE: This study was conducted to assess the quality of impressions and tooth preparations sent to dental laboratories in Jordan and to determine the technical capabilities of these laboratories to construct fixed partial dentures. MATERIALS AND METHODS: A sample of 136 impressions and stone casts were examined for clinical errors in 35 laboratories that construct fixed partial dentures. They were sorted into unusable, unsatisfactory, acceptable, or satisfactory categories. The type of impression material and tray, opposing arch impressions, and occlusal records were noted. Instructions to technicians were assessed for completeness and clarity. Information regarding laboratory staff and equipment were collected. RESULTS: Half of the specimens inspected were categorized as unusable or unsatisfactory; these were found in commercial laboratories. They showed at least one clinical error such as drags or indefinite finishing lines in impressions and inadequate reduction, undercuts, or obvious taper on stone casts. Alginate impression material was used for 65% of the cases. Only 27% of specimens were accompanied with instructions; of these 22% were graded poor. No occlusal records were available with 54% of the specimens and no articulators were used except in dental school laboratories. The dental schools and some commercial laboratories had the best staff and equipment and were more capable of fabricating fixed partial dentures than those of the Ministry of Health and the Royal Med cal Services. CONCLUSION: The quality of abutment preparation and impressions were unsatisfactory or unusable in 50% of cases. Of the 37 available instructions 8 were not clear. The dental schools and some commercial laboratories were technically capable of producing good quality fixed partial dentures.

Dental Abutments↗

PubMedDate not supplied

25 years of veneering: what have we learned?

This is a review of the research completed over the 25 years in which dentists have been veneering teeth. Recommendations are made relative to the tooth preparation design for composite resin veneers and porcelain veneers. Material differences in a variety of applications are discussed together with recommended applications, indications and contraindications. From the research that has been reviewed, a series of best practices in the application of veneering materials and techniques is listed.

Composite Resins↗

PubMed2002

Illustrating predictable anterior and posterior esthetic results: two case studies.

More natural-looking restorations are possible today because of advances in the quality of impression materials and the techniques used for tooth preparation and cementation. This article presents two cases that illustrate the use of a new generation of impression materials, bonded resin cement, and pressable porcelain to obtain the desired esthetic result.

Adult↗

PubMed1999

Long-term survival characteristics of 832 resin-retained bridges and splints provided in a post-graduate teaching hospital between 1978 and 1993.

The clinical performance of 832 resin-retained bridges and splints provided in the adult fixed prosthodontic clinic of a post-graduate teaching hospital was reviewed. Recall data was available for 58.4% of cases and the median survival was 7 years and 10 months. Analysis of clinical variables influencing survival revealed that the design and retainer coverage were significant factors. The experience of the operator carrying out treatment also had a pronounced effect which was not readily explained in terms of the distribution of other significant factors. Resin-retained restorations made with minimal tooth preparation are shown to be capable of extended clinical service and their failure rarely resulted in adverse consequences for the patient. Patient satisfaction with their treatment was reportedly high.

Adolescent↗

PubMed2006

[Rehabilitation of an abraded occlusion with Procera-ZrO2 all-ceramic crowns. A case report].

The rehabilitation of a patient with advanced tooth wear by means of Procera ZrO2 ceramic crowns is described. A healthy, 60 year old patient complained about front teeth esthetics and impaired function due to reduced tooth height. He was aware of bruxism and wished full mouth rehabilitation. The clinical examination showed that tooth wear was generalized, but most teeth could be maintained in both jaws. A staged procedure was planned, starting with a splint therapy and a provisional fixed prosthesis to reestablish correct vertical dimension of occlusion (VDO) and stable occlusal contacts. The new ZrO2 material with the Procera technique was chosen to restore all teeth in both jaws, except the mandible front teeth. In the second treatment phase, crown lengthening of the maxillary front teeth was performed and one implant placed to replace a maxillary premolar. After final tooth preparation, impression taking and bite registration the ZrO2 crown-copings were scanned, processed and completed by veneering. A flat occlusal scheme with stable front teeth guidance was established. The advantage of the presented treatment is the esthetic result in combination with a material of high mechanical and biological quality.

Bruxism↗

PubMedDate not supplied

Soft tissue management in oral implantology: a review of surgical techniques for shaping an esthetic and functional peri-implant soft tissue structure.

Along with osseointegration and restoration of function, the patient's subjective satisfaction with the esthetic result is a touchstone of the success of implant therapy. Although esthetic restoration of natural teeth can be achieved routinely through appropriate tooth preparation and a natural-looking design on the part of the dental laboratory, the road to success is much more complicated with implants, because of atrophy of bone and mucosa. Surgical techniques, paths of incision, and useful instruments for implant therapy are described, from implant placement to exposure. These methods help to provide durable, functional, and esthetic results.

Alveolar Process↗

PubMed2002

Predictable fixed prosthodontics: technique is the key to success.

This article reviews step-by-step clinical procedures for fixed prosthodontics that include a discussion of the following case parameters: (1) proper diagnosis and case selection; (2) tooth preparation; (3) soft tissue management; (4) impression making; (5) provisionalization; (6) additional laboratory diagnostic information; (7) case try in; and (8) case delivery. When the clinical principles of these procedures are faithfully followed, the success and predictability of any restorative endeavor will be greatly enhanced.

Cementation↗

PubMed1998

Comparison of the new matrix system with traditional fixed prosthodontic impression procedures.

This article compares the methods and effectiveness of traditional fixed partial denture impression systems, which includes the matrix impression system, in relation to the registration of the finish lines and sulci of tooth preparations in the formation of a full arch impression. Concepts relating to custom trays, retraction, homeostasis, sulcular cleansing, sulcular flange registration, configuration and strength, viscosity of elastomeric impression materials, and delivering the impression material into the sulcus are reviewed. Several concepts are questioned and alternative procedures are proposed. Forces that impact the gingival tissues and determine the success of the impression are briefly described.

Dental Impression Materials↗

PubMed1996

Resin-bonded fixed partial dentures: a review of three decades of progress.

The resin-bonded fixed partial denture has undergone significant changes in design, materials and tooth preparation since its development in 1973. The selection of resin cement and micromechanical retention have closely paralleled alloy-resin-bonding research. Despite impressive in vitro research results, only 74 percent of the prostheses are still functional at the end of four years. Understanding the limitations, indications and design of resin-bonded fixed partial dentures will result in improved longevity and patient satisfaction.

Dental Alloys↗

PubMed1985

Esthetic mouth preparation for ceramic restoration.

At the beginning of this article, we asked the question "Is there a problem?" The answer to this question is yes, but at different levels for individual dentists and individual treatment situations. Adequate esthetic mouth preparation for ceramic restorations requires far more than tooth preparation. This article has outlined the major areas of concern. Readers must recognize areas of individual need and explore them in greater detail in the dental literature. It is hoped that this article has stimulated readers to learn more about esthetic moth preparation for ceramic restorations.

Crowns↗

PubMed2006

Influence of finish line design on marginal adaptation of electroformed metal-ceramic crowns.

STATEMENT OF PROBLEM: Gold electroformed metal-ceramic restorations have been promoted as alternatives to conventional metal-ceramic restorations. However, little is known about the relationship between tooth preparation design and marginal adaptation for this type of crown. PURPOSE: This study evaluated the influence of 3 different finish line designs on the marginal adaptation of electroformed metal copings and metal-ceramic crowns. MATERIAL AND METHODS: Three steel dies were prepared for maxillary central incisor crowns with 3 finish line designs: shoulder, rounded shoulder, and deep chamfer preparations. Eight standardized electroformed metal-ceramic crowns were fabricated for each group. Marginal discrepancies were measured at 60 points for each specimen along the circumferential margin at 4 sites (labial, mesial, lingual, and distal surfaces, with 15 points for each site) before and after firing procedures using a laser microscope. Data among the 3 different groups were statistically analyzed using the Kruskal-Wallis test and the Mann-Whitney U test with the Bonferroni correction. Marginal discrepancies between prefiring and postfiring procedures were evaluated using the Wilcoxon signed-ranks test (alpha = .05). RESULTS: Significant differences in the marginal discrepancies of electroformed metal copings without porcelain and metal-ceramic crowns were found among all groups. The lowest range of median marginal discrepancy values (P < .05) at 4 sites, both before and after firing, occurred with the deep chamfer preparation (17.64-21.78 microm and 23.96-25.72 microm, respectively). The highest range values were observed in the shoulder preparation (38.13-49.89 microm and 73.87-89.44 microm, respectively). In all situations, the marginal discrepancies of the postfiring procedures were significantly greater (P = .02 or less) than those of the prefiring procedures. CONCLUSION: Within the limitations of this study, the marginal adaptation of electroformed metal copings or metal-ceramic crowns is affected by finish line design and sequentially diminished by porcelain firing procedures.

Aluminum Silicates↗

PubMedDate not supplied

Modified resin-bonded design for stabilization of mobile teeth: technique and clinical observations.

A design modification of the tooth preparation and framework design is presented to further enhance stabilization of mobile teeth with resin-bonded splints. An appropriate shade of composite resin is placed to restore an esthetic contour, cover the incisal edge framework extensions, and provide occlusal function as indicated. Patient reviews are presented to demonstrate the principles of treatment, versatility, and limitations of this treatment modality.

Adult↗

PubMed1996

Aesthetic all-ceramic restorations: a philosophic and clinical review.

The current focus of aesthetic dentistry is on tooth-colored, metal-free restorations in the anterior and the posterior regions and the biocompatibility and toxicologic safety of these restorative materials. This article reviews eight years of clinical experience with all-porcelain restorations and documents the observations of several clinical cases. It discuss tooth preparation for all-ceramic inlays, onlays, and veneer and crown restorations, as well as isolation, etching, placement, bonding, and lightor dual-curing of the materials. The learning objective of this article is to share the experience and observations with other clinicians. The author concludes that restorations, identical to natural dentition, can be predictably achieved with current allporcelain systems and that critical scientific analysis of dentin bonding agents must continue. The utilization of all-porcelain material in multiple-unit bridges should still be viewed with caution, and further long-term experience is required.

Crowns↗

PubMed2000

[Dental crowns made from a titanium alloy prepared by a superplastic molding method].

The possibility of making titanium tooth crowns by superplastic molding has been investigated. Optimal materials and technological parameters have been selected: Siolit molding mass, fixing composition for facing with plastic (Targit link + opaquer), method for tooth preparation under such crowns (step 135, stump height to diameter ratio 1.5:1, smooth transfer from occlusion surface to others, and disposition of stamps in the press form.

Crowns↗

PubMed1996

Clinical performance of resin-bonded fixed partial dentures.

Resin-bonded fixed partial dentures (RBFPDs) initially recorded poor survival rates because of indefinite tooth preparations and arbitrary selection of composite resin cements. In this study, 46 RBFPDs were inserted for a longitudinal study up to 45 months. The influence of location--anterior/posterior, or maxilla/mandible--and the inclusion of pontics in occlusal excursions on the survival rates was investigated. Periodontal parameters were recorded from abutments and controls (teeth). Eight RBFPDs lost retention and two RBFPDs failed because of porcelain fractures. The anterior to posterior location and the maxillary or mandibular arch had significant influence on the survival rates. Gingival scores of abutments and controls differed significantly, but statistically significant differences were not recorded for plaque scores.

Adolescent↗

PubMed2004

In vivo and in vitro permeability of one-step self-etch adhesives.

Adhesive dentistry should effectively restore the peripheral seal of dentin after enamel removal. We hypothesize that non-rinsing, simplified, one-step self-etch adhesives are effective for minimizing dentin permeability after tooth preparation procedures. Crown preparations in vital human teeth were sealed with Adper Prompt, Xeno III, iBond, or One-Up Bond F. Epoxy resin replicas were produced from polyvinyl siloxane impressions for SEM examination. Dentin surfaces from extracted human teeth were bonded with these adhesives and connected to a fluid-transport model for permeability measurements and TEM examination. Dentinal fluid droplets were observed from adhesive surfaces in resin replicas of in vivo specimens. In vitro fluid conductance of dentin bonded with one-step self-etch adhesives was either similar to or greater than that of smear-layer-covered dentin. TEM revealed water trees within the adhesives that facilitate water movement across the polymerized, highly permeable adhesives. Both in vitro and in vivo results did not support the proposed hypothesis.

Acid Etching, Dental↗

PubMedDate not supplied

Fracture resistance of lithium disilicate-, alumina-, and zirconia-based three-unit fixed partial dentures: a laboratory study.

PURPOSE: The purpose of this study was to determine the fracture resistance of three-unit fixed partial dentures (FPD) made of new core ceramics. MATERIALS AND METHODS: A base metal three-unit master FPD model with a maxillary premolar and molar abutment was made. Tooth preparation showed 0.8-mm circumferential and 1.5-mm occlusal reduction and a chamfer margin design. FPDs were constructed with a uniform 0.8-mm-thick core ceramic and a porcelain veneer layer. In-Ceram Alumina, In-Ceram Zirconia, and DC-Zirkon core ceramics were machined by a computer-aided design/manufacturing system, whereas IPS Empress 2 core ceramic was indirectly built up using the fabrication technology of waxing and heat pressing. FPDs of IPS Empress were heat pressed as complete restorations without core material. To ensure standardized dimensions, the FPDs were controlled at different points. All FPDs were cemented with ZnPO4 on the master model and loaded on a universal testing machine until failure. The failure load and mode of failure were recorded. RESULTS: The highest failure loads, exceeding 2,000 N, were associated with FPDs of DC-Zirkon. FPDs of IPS Empress and In-Ceram Alumina showed the lowest failure loads, below 1,000 N, whereas intermediate values were observed for FPDs of IPS Empress 2 and In-Ceram Zirconia. Differences in mean values were statistically significant. CONCLUSION: The high fracture resistance evaluated for FPDs made of DC-Zirkon underscores the remarkable mechanical properties of high-performance ceramic, which could be useful for highly loaded all-ceramic restorations, especially in the molar region.

Aluminum Oxide↗

PubMed2002

Retentive properties of five different luting cements on base and noble metal copings.

STATEMENT OF PROBLEM: The retention of indirectly fabricated restorations can be compromised by short or over-tapered tooth preparations. PURPOSE: The aim of this study was to evaluate the retentive properties of 5 different luting cements on base and noble metal copings to short and over-tapered preparations. MATERIAL AND METHODS: Eighty extracted mandibular premolars were prepared to receive full cast copings with a flat occlusal surface, 33 degrees taper, and 3-mm axial length. Half of the standardized metal copings were cast in an AuAgPd alloy, whereas the other half were cast in an NiCr alloy. Cementation was performed with 5 different luting cements through use of 5 kg of pressure in 90% relative humidity. Specimens were stored in distilled water at 37 degrees C for 24 hours and thermocycled between 5 degrees C and 55 degrees C for 5000 cycles, with a dwell time of 30 seconds. After thermocycling, vertical tensile force was applied in a Zwick universal testing machine with a constant speed of 1 mm/min until separation was noted. A 2-factor analysis of variance was used to analyze the data, with a significance level of alpha =.05. RESULTS: Mean dislodgement forces for AuAgPd crowns and NiCr crowns were 120.88 N and 143.09 N, respectively, for zinc phosphate cement; 135.45 N and 150.38 N for Principle; 145.88 N and 220.71 N for Meron; 276.85 N and 225.61 N for Avanto; and 300.92 N and 381.02 N for Fuji Plus. CONCLUSION: Within the limitations of this study, Fuji Plus and Avanto showed significantly higher retentive strengths for AuAgPd copings in comparison to the other cements tested (P <.05). The retentive strength of Fuji Plus was significantly higher than those of the other cements tested with NiCr copings (P <.05).

Adhesiveness↗