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Prosthodontics
Crowns (Fixed Dentures)
Dental prosthesis replaces missing natural teeth by putting false
teeth or "dentures" which are divided in two categories,
"fixed dentures" and "removable dentures".
A fixed denture which is called "Crown" indicated for
patients with damaged tooth of the entire surface, but the root
system has remained intact or heavily decayed tooth which is more
likely to fracture and lose considerable tooth substance.
Crowns may be made from several different materials but the most
common types are 'All Ceramic Crown' and 'Porcelain Fused to Metal
Crown or P.F.M. Crown'.
'All Ceramic Crown'
If crowning is necessary, all ceramic crowns are preferable if the
tooth is in a position that can be clearly seen or the patient is
allergic to metals. Compared to PFM crown, all ceramic crowns yields
a more beautiful natural look and goes better with the gum tissue.
However, the crown could be difficult to fit neatly, and it tends
to break or crack easily if the tooth is not properly prepared,
the material is too thin, and the traditional dental cement is used
for bonding. The treatment should be avoided in patients with parafunctional
habit or when the remaining tooth structure is not thick enough
after preparation, and teeth to be restored as abutment for removable
partial denture.
'Porcelain Fused to Metal Crown (P.F.M.Crown)'
Porcelain fused to metal crown has been in wide use due to its durability
and beauty, even though the metal crown can sometimes be visible
at gum margin and the tooth color can be somewhat unnatural. The
drawbacks however can be solved by using porcelain margin for the
crown side that faces the inside of the lip, using high-grade metals,
and making sure that the prepared tooth is thick enough to avoid
unnatural color. The treatment is suitable for patients with severely
damaged tooth, broken or cracked tooth, worn out tooth due to bruxing
or clenching, and biting level problems.
| All-Ceramic Crown |
Full-mouth Modification with Crowns, Bridges and
Veneers |
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