Fitting a Crown & Bacterial Plaque

In fitting a crown to a specific location, the relative health of the gingival tissues surrounding the crown site must be considered. Crowns are usually proposed as a restoration when a tooth is either very severely destroyed by dental caries or trauma or, in the case of posterior teeth, if root canal therapy has ensued. Crowns must therefore be custom made to fit properly, providing proper occlusion, contour, and contacts with adjacent teeth (5:95). Prior disease factors, caused by existent gingival conditions, must be considered before a crown is applied. Likewise, if proper care is not taken while applying the crown, or because of errors in manufacture or judgment, trauma can occur.

If the optimum health of gingival tissues involved cannot be guaranteed before the dentist or technician makes an impression, than one

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argins, and it lacks the edge strength needed for restoring large portions of the biting surfaces of molars. Silver amalgam does well when it is placed within the confines of a tooth in a one surface cavity. But it is less successful for use as a wall of a tooth and the where an amalgam is expected to replace an edge, as in certain twoor threesurface fillings (1:4950). For cavities of unusual size, gold is the recommended material. It possesses great strength and durability and should be used for areas that require great biting strength and for teeth that have lost a wall. On the downside, gold is expensive and not as easily workable as silver amalgam (1:5152). Synthetic porcelain, if properly colormatched, has the advantage of being inconspicuous. However, these synthetics have a tendency to wash out or dissolve. Poly methyl methacrylate, among other plastic fillers, have great chemical stability and are relatively strong. However, the environment of the mouth slowly wears these materials down, often discolors them, and can cause shrinkage from the cavity walls. Manipulating plastics is difficult and requires careful cavity preparation and expert handling (1:52). In the case of a crown, which is proposed a
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Approximate Word count = 1851
Approximate Pages = 7 (250 words per page)