what is an undercut dental

What Is An Undercut Dental? DEFINITION. 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 the undercuts in dentistry? Mosby’s Dental Dictionary defines an undercut as “the portion of a tooth that lies between its height of contour and the gingiva, only if that portion is of less circumference than the height of contour.” Undercuts exist because of natural tooth morphology and contours.

What is soft tissue undercut? soft tis·sue un·der·cut (sawft tishū ŭndĕr-kŭt) Inward notching at the residual ridge or soft tissue of a dental arch that would influence the form of a removable denture.

What is an undercut gauge?

un·der·cut gauge a device, used with a surveyor, to locate areas for the placement of the retentive components of clasps precisely when designing removable partial dentures.

What causes undercut?

Undercut can occur for several reasons: Excessive heat from high current and voltage settings. If the travel speed is too fast, the electrode moves away from the weld pool prematurely. If edges are not prepared properly dirt or grit on the welding surfaces tends to block heat transfer which can cause undercutting.

What is undercut in tooth preparation?

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). If the tilt of the cast is changed (changing the path of placement of the denture) the depth of the undercut will change (Fig.

What is contour in dentistry?

Tooth reshaping, also called dental contouring, is a cosmetic dental procedure that deals with making subtle changes to someone’s teeth. During dental contouring, small amounts of tooth enamel (the outer covering of the tooth) are removed, in order to change the shape, length, or surface of one or more teeth.

What is the height of contour on teeth?

The height of contour (crest of curvature) is the greatest amount of a curve, or greatest convexity or bulge, farthest from the root axis line. The height of contour on the facial or lingual surfaces of the crown is where this greatest bulge would be touched by a tangent line drawn parallel to the root axis line.

What is impression plaster?

Mainly composed of β-calcium sulphate hemihydrate, impression plaster has a similar composition and setting reaction to the casting material with an increase in certain components to control the initial expansion that is observed with Plaster of Paris.

When do you use a wrought wire clasp?

A wrought wire is preferred for retention when the undercut occurs in the mesial third of the buccal surface of an abutment tooth. The adjustability, lack of tissue co- verage and reparability are the main advantages of these kinds of clasps.

When do you use an Embrasure clasp?

Embrasure clasp This design is most frequently used in cases of unilateral edentulous span of an unmodified Kennedy Class II or Class III partial denture, on the side of the arch where there is no edentulous space.

What is the adverse effect of an undercut?

Basically, undercut will cause local stress concentration, since the depth of under- cut reduces the cross-sectional area of base metal.

What is border molding?

The border molding technique is the shaping of the border areas of a custom impression tray by manual or functional manipulation of the tissue adjacent to the borders in order to duplicate the size and contour of the vestibule resulting in maintains of the peripheral seal during function.

What is Vestibuloplasty surgery?

Vestibuloplasty is a surgical procedure designed to restore alveolar ridge height by lowering muscles attaching to the alveolar bone. It is most often seen when preparing the mouth for dentures or an implant.

What is inlay and onlay in dentistry?

Onlays Vs Dental Crowns The primary distinction between an onlay and an inlay is that an onlay will cover a cusp of the tooth, whereas an inlay only fills the area between the cusps. The cavity is still drilled from the tooth, and an onlay is fabricated to the exact size and shape of the space.

What is tooth stoning?

This procedure involves the dentist removing very small strips of tooth enamel to change the length or shape of the offending tooth.

What is enameloplasty dental?

Enameloplasty is a cosmetic dental treatment that involves using a specialized buffing tool to reshape your teeth. This tool uses a high-speed abrasive tip that gently removes a thin layer of enamel.

What is your vampire teeth called?

In mammalian oral anatomy, the canine teeth, also called cuspids, dog teeth, or (in the context of the upper jaw) fangs, eye teeth, vampire teeth, or vampire fangs, are the relatively long, pointed teeth.

What teeth are non Succedaneous?

Each of the primary molars is replaced by permanent, premolar teeth. There are three permanent molars in each quadrant that are not succeeded by primary teeth and may be referred to as non-succedaneous teeth.

What is the anatomic crown?

The anatomical crown is all of the tooth that is covered with the enamel. Then the clinical crown is a portion of the anatomical crown that is visible. The clinical crown is the part of the tooth that you see when you look in the mouth.

Why do my teeth have ridges?

The ridges appear when permanent teeth start growing at a young age. Mamelons are formed from the enamel, which fuses together when a child’s teeth are developing underneath their gums. A child’s front teeth are formed as lobes that are fused before they break through the gum tissue.

Is dental plaster and impression plaster same?

Impression plaster is a rigid impression materials,used in shellac special trays to make 2ry impressions for edentulous patient has no or shallow undercuts. Where as dental plaster is the beta form of calcium sulfate hemihydrate (CaSo4 . 1/2 H2O), a mixture of plaster of paris and water.

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