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A fracture in an all-ceramic crown may be caused by
1. inadequate ceramic thickness.
2. sharp line angles in the tooth preparation.
3. excessive occlusal load.
4. use of an inappropriate luting material.
(1) and (3)
All of the above.
(1) (2) (3)
(4) only
(2) and (4)
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valikhadivi1329
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