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Results for “DENTAL MODELS”

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At least 1,477 records · Page 82Linked to original sources
PubMed1977

Removal time: a factor in the accuracy of irreversible hydrocolloid impressions.

Controversy exists regarding the correct time of removal of an alginate impression from the mouth. To investigate the effect of time of removal on accuracy, a series of alginate impressions were made of the lower left quadrant of a subject having a cast gold crown with four reference marks on tooth no. 19. The impressions were removed from the mouth at 1-5, 2, 3, 4-5 and 7 min after the insertion of the tray. Accuracy of the impressions was assessed by comparing the distances between the reference marks in stone casts with standard measurements taken from the gold crown prior to cementation. Impressions removed at 1-5 and 7 min produced the greatest distortions buccolingually. For the mesio-distal lengths all time intervals produced casts which were larger than the standard. The reasons for these findings are discussed and possible explanations are presented.

Alginates↗
PubMed1999

A technique to replicate soft tissues around fixed restoration pontics on working casts.

When missing maxillary incisors are replaced, the patient's primary concern is usually esthetics. Depending on the patient's smile line and the display of the incisors, the esthetic zone may extend to the entire clinical crown and include the surrounding soft tissue. For these patients, the appearance and form of the soft tissue at the base of the pontics is as critical as the esthetics of the incisal edges of the restoration. A technique is presented to precisely transfer the soft tissue morphology of the pontic area to the working cast. This modified master cast allows the laboratory technician to fabricate restorations that will harmonize precisely with the soft tissues of the patient.

Dental Impression Technique↗
PubMed2000

Improved laboratory results for fixed restorations using sequential tooth preparation.

Laboratory reference guides provided by the dentist help ensure optimum results in fixed prosthodontics. A technique is described in which a master cast is made before preparation of the last tooth to be treated. Through this technique, the laboratory prescription includes the dimensions of the new restorations in relation to those of the unprepared tooth replica on the master cast. Thus, the technician is afforded not only a precise guide to restoration contour and size, but also a helpful pretreatment record of the patient's vertical dimension.

Crowns↗
PubMed2001

Conversion of an implant radiographic template into a surgical template.

A method is presented for converting a radiographic template into a surgical template using the information acquired from the analysis of tomograms. Necessary changes of the implant position and angulation are transferred to the indexed and sectioned cast. Realignment of the initial template with the correct position allows its modification into a surgical template.

Dental Implantation, Endosseous↗
PubMedDate not supplied

Fixed rehabilitation of an ACP PDI Class IV dentate patient.

This clinical report describes the prosthodontic rehabilitation of a Class IV dentate patient. Maxillary and mandibular fixed restorations were constructed for the therapy. Canine-protected occlusion was developed in the definitive restorations to decrease lateral forces on the posterior dentition. Protrusive guidance was developed to distribute protrusive forces to the maxillary and mandibular incisors.

Adult↗
PubMed1980

Effect of the setting expansion of dental stone upon the die precision.

The present investigation has shown that the setting expansion of two dental stones when measured according to the ADA Specification No. 25, was lower than the expansion determined by a dial gauge method. The values from this latter test and the percentage deviation of the diameter of full crown stone dies (produced in individual silicone impressions) from the base diameter of the original preparation were identical. A reduction of the effective expansion to a value of 0.05% or less is desirable and proved possible for the stone materials studied without altering other important properties.

Calcium Sulfate↗
PubMed2006

Comparison of forces transmitted through different EVA mouthguards.

Athletic mouthguards have been recommended for decades with varying levels of athlete acceptance. Issues related to compliance center around the ability to breath and speak while wearing the mouthguards. Fabrication techniques have changed over time to a two-layer ethylene vinyl acetate mouthguard fabricated on a high-pressure machine. The reported ideal thickness of these mouthguards has been somewhat variable depending on the sport and anticipated level of risk. Recent research however, has identified 4 mm as the optimal thickness of EVA. In this study an acrylic dental cast was fabricated and mounted to a drop impact fixture. Mouthguards of varying ply, thickness and palatal coverage were fabricated and tested in the fixture. Strain gauges and load cells were used to evaluate the effect of ply, thickness, and palatal coverage on the ability of these mouthguards to minimize transmitted forces. The purpose of this study was to identify those variables of mouthguard construction that will minimize the overall transmitted force of impact to the anterior dentition.

Analysis of Variance↗
PubMed2004

Novel porcelain laminate preparation approach driven by a diagnostic mock-up.

UNLABELLED: One critical step in the porcelain laminate technique is the achievement of sufficient ceramic thickness. At least two different strategies for tooth preparation can be found in the literature: (1) earlier simplified techniques included the use of depth cutters guided by the existing tooth surface-however, that approach did not take into consideration alterations of the tooth owing to aging, wear, or loss of enamel and thus led to greater risks for dentin exposures; (2) more recent and sophisticated methods have integrated an additive diagnostic procedure (ie, wax-up or mock-up) to compensate for tooth aging or severe existing loss of tooth substance. This approach allows for more enamel preservation and, as a consequence, more predictable bonding, biomechanics, and esthetics. The present article illustrates in detail the latest development in tooth preparation for porcelain laminates. This technique combines the time efficiency of earliest methods with the rationale and diagnostic foundations of the more recent techniques. CLINICAL SIGNIFICANCE: Using this new laminate porcelain preparation approach, clinicians should be able to produce not only more accurate preparations, but also higher-quality tooth preparations in a time-efficient fashion.

Composite Resins↗
PubMed1965

Replicas of teeth.

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Education, Dental↗
PubMed1987

Validity and reproducibility of rating dental attractiveness from study casts.

In the course of a multi-disciplinary investigation of 1018 children, standardized dental photographs and study casts were obtained. It has been shown that panel ratings of dental attractiveness from standardized photographs have good validity, high intra- and inter-judge reproducibility and to be representative of lay judgement. However, such ratings compound an appraisal of cleanliness, tooth colour and gingival health in addition to purely orthodontic features. In order to isolate the latter, attractiveness ratings of study casts were made by a three person panel using visual analogue scales.

Child↗