Tooth reduction for anterior tooth preparation for metal-ceramic and all ceramic crowns is dictated by which of the following factor(s)? 1. Crown length for adequate retention-resistance. 2. Porcelain/ceramic thickness for fracture resistance. 3. Clearance for occlusal function. 4. Parallelism of axial walls for facilitating the path of insertion.
(4) only
(1) and (3)
(2) and (4)
All of the above.
(1) (2) (3)
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