Achieving optimum dental aesthetics is a difficult and challenging
task. Fixed dental restorations play a major role in dental
aesthetics. Metal ceramic and all-ceramic restorations are most
commonly used in clinical practice. Metal ceramic restorations are
known for its strength and reasonable aesthetics. Traditionally
Metal ceramic restorations incorporate a collar which is in fact an
aesthetic handicap, as the metal collar blocks light transmission
through the tooth structure, darkens the root and cause
discoloration of gingiva adjacent to the restoration. Generally all
ceramic restorations are known for increased light transmission and
diffusion. Absence of metal collar in all-ceramic restorations
minimizes or in fact eliminates undesirable effects produced by the
metal collar. However Zirconia in all-ceramic restorations has
opacity and its optical behavior has been considered similar to
metal. Both in metal and all ceramic restorations, the cervical
region challenges the aesthetic achievement. Hence employing
cutback in the substructure is considered to be a viable technique
which can bring aesthetic improvement.
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