SurgiMac’s Automatic Crown Remover Gun Type Spring Loaded with 4 Tips and Adjusting Wrench features the following functionality - 

Features:

• The spring-loaded mechanism for quick and easy crown removal
• Ergonomic handle for comfort and control
• Comes with 4 different tips to accommodate different crown types
• Easy to clean and sterilize
• The Crown remover is a spring-loaded mechanical device to remove the bonded crowns and bridges by an intensive impulse. The Cement layer breaks with the impulse and the crown or bridge can be removed easily.
• It also contains a straight rod that can be attached for safety purposes when not in use.
• Four different designs of tips allow for engaging different types of crown margins. Impulse strength should be lowered for root-treated teeth.
• Its spring is titanium made that retains its strength even after recurrent autoclaves.
  For permanent removal of crowns by breaking the seal between tooth and crown even after sectioning with a bur.
• The setting of the impulse to a higher level can break the underlying tooth. Be careful.