The try-in procedure can be accomplished on many patients without administering an anesthetic. The patient’s unimpaired tactile sense can be valuable during the adjustment of the occlusion, and the annoyance of lingering anesthesia is avoided. However, if the patient is uncomfortable by the procedure, an anesthetic should be given.
Cementation should be postponed if the px reports of tooth sensitivity under the provisional/temporary crown. The tooth would be subjected to a greater chemical and thermal trauma upon placement of permanent restoration.***Never cement a crown permanently over a symptomatic tooth.
Evaluation of a Restoration should be carried out in the following sequence: 1. Adjustment of Proximal Contacts Proximal contacts of the restoration must be neither too tight nor too light/loose. If too tight, they interfere with correct seating, produce discomfort and make it difficult for the px to floss If too light/loose, allows food impaction which is harmful to the gingival and annoying to the px
2. Marginal Adaptation (Completenessof Seating) After the proximal contacts have been corrected, seat the restoration and examine the margins closely An acceptable margin should not be overextended, underextended, too thick, or open
Most common cause of poor margin adaptation is the failure of the restoration to seat completely If the proximal contacts are not too tight and the margins are still short or open, there may be some minute undercut, unseen defect or distortion preventing seating
3. Occlusal Adjustment Only after the resto is seated completely can occlusal adjustments be performed Use articulating paper and instruct the px to open and close his mouth making sure that the teeth are in their correct intercuspation once occlusion is established
Make sure that the markings on the teeth exhibits evenness, if not, necessary adjustment should be made especially on those areas with darker markings Adjustment of the restoration in excursive movements is also essential in establishing the correct occlusion
4. Contours Improper contours may impair gingival health and detract from the natural appearance, must be corrected prior to cementation Excessive convexity near the gingival margin promotes plaque accumulation
Surfaces directly occlusal to furcations are usually concave and the concavity should extend occlusally on the axial surface of the restoration to improve access for a toothbrush
5. Esthetics Step back and view the restoration from a conversational distance to see if its contours harmonize with the rest of the px’s dentition Let the px look in a mirror so that any objections to the appearance can be dealt with prior to cementation
Looking at theteeth in a wallmirror shows apatient how therestored tooth willlook to others at anormal conversa-tional distance.
Using a handmirror held onlyinches from themouth allows thepatient to see theteeth as no oneelse will.