What are refractory casts?

What are refractory casts?

Refractory cast: It is a cast made of material that will withstand high temperature without. disintegration when used in partial denture casting procedure; it has an expansion to. compensate for metal shrinkage. The refractory cast has been made of investment material.

What is blocking out in dentistry?

A dental technique is described that blocks out enlarged gingival embrasures to eliminate distortion of an impression and the resultant cast for removable partial or fixed partial dentures. This procedure consists of injecting polyvinyl siloxane impression material in embrasures to form custom blockout wedges.

What is the altered cast technique?

The altered cast technique allows the ridge, recorded in functional form, to be related to the teeth so that when the prosthesis is seated, it derives support simultaneously from the teeth and the denture base.

What is combination syndrome?

Combination syndrome (CS) is a dental condition that is commonly seen in patients with a completely edentulous maxilla and partially edentulous mandible with preserved anterior teeth.

What is a refractory cast made of?

re·frac·to·ry cast a cast made of material that will withstand the high temperatures of metal casting or soldering without disintegrating.

What is a working cast?

Working cast and die. Working cast (master cast): It is a replica of the prepared tooth (or. teeth), ridge area, and other parts of the dental arch. It is obtained from the final impression, and on which the wax pattern is made (laboratory work).

What are undercuts in dentistry?

An UNDERCUT is the portion of the surface of an object that is below the height of contour in relation to the path of placement. 1. An undercut is the part of a tooth or cast surface cervical to the survey line (height of contour) AT THE SELECTED PATH OF PLACEMENT of the denture (TILT OF THE CAST).

What is Tripoding in RPD?

Tripoding method is the simplest and traditionally used for recording the final orientation of the cast on the surveyor. It uses an analyzing rod or the carbon marker to locate and mark three points on the prominent areas of the cast.

What is a corrected cast?

An altered cast impression procedure to improve the support of distal extension removable partial dentures is widely taught, but not often used in dental practice (2). Also known as the corrected-cast technique (3) the technique requires an additional step for both the dentist and the dental technician.

What is split cast technique?

Split cast mounting is the method of mounting casts on the articulator. It is essentially a maxillary cast constructed in two parts with a horizontal division. The procedure allows for the verification of the accuracy of the initial mounting and the ease of removal and replacement of the cast.

What is Kelly’s syndrome?

Kelly’s theory suggests that negative pressure within the maxillary denture pulls the tuberosities down, as the anterior ridge is driven upward by the anterior occlusion. The functional load will then direct stress to the mandibular distal extension and cause bony resorption of the posterior mandibular ridge.

What is Christensen phenomenon?

[C. Christensen, Danish dentist and educator] A gap occurring in the natural dentition or between the opposing posterior flat occlusal rims when the mandible is protruded (posterior open bite). It can lead to instability in full dentures unless compensating curves are incorporated into the dentures.