FERRULE EFFECT: -
 Value = 1.5 to 2 mm — minimum height / length of crown after prep
 Most important factor for placement of crown*
 If not enough height
o Surgical crown lengthening + clinical post and core
o Orthodontic extrusion (#ed at gingival part)
 Q. The degree of the inclination of an abutment, which can be used 15 – 25 º.

TEMPORARY CROWN
 Anterior — polycarbonate-Prefabricated crown-like cover
*most esthetic than acrylic and composite
 Transparent cellulose acetate covers-trim the template-fill it with material-stick it on the tooth and after setting remove the plastic cover.
 Putty impression template
 Materials used
----o PMMA- INDIRECT METHOD, EXOTHERMIC
----o Bis acryl composite is used for direct method, little
brittle so good for single or short span bridge


Try-in — if correct fit
And final — poor fit is due to
over contouring