Final answer:
A pre-formed provisional crown is tried on for shape and size before the tooth is prepared, ensuring a proper fit and comfort before the tooth is reshaped for crowning.
Step-by-step explanation:
When using a pre-formed provisional crown, the crown is tried on for shape and size before the tooth is prepared. This step is crucial to ensure that the selected provisional crown has the correct contours, fits comfortably, and matches the size of the prepared tooth. After this initial fitting, dental professionals will then proceed with the preparation of the tooth, which involves reshaping the tooth s structure to accommodate the placement of the crown. Once the tooth is adequately prepared, the pre-formed provisional crown can be adjusted for a final fit and then cemented to protect the tooth until a permanent crown is fabricated and placed.