Class 1 Cavity Preparation Flashcards

All the cavities on the occlusal surfaces and the occlusal 2/3rds of the facial and lingual surfaces of the posterior teeth and the lingual surfaces of maxillary incisors.

Millions of enamel rods or prisms.

Extend from the DEJ to the external surface of the tooth.

<p>Perpendicularly oriented to both the DEJ and tooth surface.</p> Signup and view all the answers

<p>Enamel rods are oriented apically.</p> Signup and view all the answers

<p>Opacity surrounding the pits and fissures, softening of the base of pits and fissures, softened enamel that may flake away by the explorer, stickiness, loss of normal translucency of enamel.</p> Signup and view all the answers

<p>Extensive cavities.</p> Signup and view all the answers

<p>Cavity prepared because of a carious lesion and it is ready for insertion of restorative materials.</p> Signup and view all the answers

<p>All cavosurface margins must be placed 0.5mm beyond defective tissue in the sound tooth structure.</p> Signup and view all the answers

<p>Do not exceed 0.5 mm beyond defective tissue.</p> Signup and view all the answers

<p>Extent of carious lesion, removal of other enamel defects, convenience: access, visibility, relation with adjacent and opposing teeth, soft tissue consideration and esthetics.</p> Signup and view all the answers

<p>Before the start of cavity preparation: use explorer to identify starting locations and remove fissure or caries where microleakage may be occurring.</p> Signup and view all the answers

<p>Reshaping the saucer shape of enamel surface with a bur if 1/3 or less of enamel depth is involved.</p> Signup and view all the answers

<p>Round and defined.</p> Signup and view all the answers

<p>Should make obtuse angles with pulpal floor.</p> Signup and view all the answers

<p>Pro: Retentive restoration, strong restoration margin; Con: May leave unsupported enamel rods.</p> Signup and view all the answers

<p>Pro: No unsupported enamel rods; Con: Less retentive restoration, restoration with weaker margin, needs extra dentinal retention.</p> Signup and view all the answers

<p>Pro: No chance to leave behind unsupported enamel rods; Con: Moderately retentive restoration, restoration with moderately strong margin.</p> Signup and view all the answers

<p>90 degrees.</p> Signup and view all the answers

<p>Acute angle.</p> Signup and view all the answers

<p>Larger but still acute angle.</p> Signup and view all the answers

<p>To be parallel to the enamel rods, to preserve intact dentin, for stronger marginal ridges.</p> Signup and view all the answers

<p>Remove carious lesion completely, place margins in sound enamel, remove all undermined enamel rods.</p> Signup and view all the answers

<p>Smooth wall for cast gold restoration; rough walls for composite restoration; acceptable walls for amalgam restoration.</p> Signup and view all the answers

<p>Shape or form that a cavity takes to facilitate adequate visibility and accessibility.</p> Signup and view all the answers

<p>Caries are removed, weakened tooth structure is removed, remaining tooth structure is left as strong as possible, underlying pulpal tissue is protected, restorative material is retained in a strong, esthetic, and functional manner.</p> Signup and view all the answers

<p>Non-uniform depth, more shallow, preparation of walls of varying height or width, marginal angles of 90 degrees or greater, more enamel bevels and less (or no) need for retention and resistance forms.</p> Signup and view all the answers

<p>Mouth mirror, explorer, calibrated condenser, cotton pliers.</p> Signup and view all the answers

<p>Rotary cutting instruments: 256, high and low speed; hand cutting instruments: chisel: 15-8-12; hatchet: 15-8-14; hoe.</p> Signup and view all the answers

<p>Penetration, extension, finishing cavity.</p> Signup and view all the answers

<p>A bur should be placed 90 degrees on the plane that passes over the cusps and the marginal ridges.</p> Signup and view all the answers

<p>Smooth curves and straight lines.</p> Signup and view all the answers

<p>The restorative material being used: amalgam: butt joint margin; composite or cast gold: bevel margin.</p> Signup and view all the answers

<p>Defined and round but not sharp.</p> Signup and view all the answers

<p>Unsupported rods, under-extended cavity, not removing caries completely, shallow or too deep cavities, malshaped internal outline, under/over-extended external outline.</p> Signup and view all the answers