Why must care be taken in the fabrication of provisionals by utilizing acrylic materials to "pump" the template on and off the preparation after initial polymerization?

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Care must be taken in the fabrication of provisionals by utilizing acrylic materials to "pump" them on and off the preparation after initial polymerization to prevent them from locking on the tooth and to protect the tooth from heat generated during polymerization.If these materials are allowed to polymerize outside the preparation,the amount of shrinkage may be sufficient to inhibit their seat.

Why Must Care Be Taken in the Fabrication of Provisionals