principles of tooth reduction

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1- All prevent damage of adjacent teeth except

1 point

a- enemel lip.

b-stone against adjacent tooth

c-bond, wedge, separator

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2- Minimal practical convergence angle should be

1 point

a-(10-12) degree.

b(3-6)

c-(2-7)

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3- They are all advantages of supra gingival margin, except

1 point

a-no injury to gingival.

b-easily prepared, impression, die

c-less conservative.

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4- All of that Indication of sub gingival margin, except

1 point

a-cervical erosion.

b-long clinical crown.

Optic-root sensitivityon 3

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5 Indefinite finish line used occasionally on tilting tooth

1 point

a-feather edge.

b-chamfer

c-chisel

d-bevel

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6 The most conservative definite finish line

1 point

a-chisel

b-feather.

c-chamffer.

d-bevel.

e-shoulder with bevel.

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7- Finish line used with all ceramic (1mm) & facial metal ceramic (1.3-1.5)

1 point

a-shoulder.

b-chamfer.

c-bevel

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8- Increase retention form by, except

1 point

a-increase magnitude of dislodgement force.

b-increese teper.

c-limit number of path of insertion.

d-tall&narrow preparation.

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9- Margin should be except

1 point

a-following gingival contour

b-avoiding enamel lip.

C-short..

d-rough &indefinite.

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10- Causes of deformation of restoration except

1 point

a-inappropriate alloy selection

b-inadequate tooth preparation.

C-sufficient tooth reduction &good connector,

d- poor metal ceramic.

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