Skip to Primary Navigation Skip to Site Navigation Skip to Main Content All 3M.com Site Map
 

Stone Model Discrepancies

Visual Appearance: Voids on margin, powdery cusp tips on incisal edges on prepared tooth. "Golf-ball" appearance of stone model.

Result: Incomplete seating of indirect restorations.

Click to enlarge
Stone Model with Hydrogen Evolution Voids

 

Click to enlarge
Stone Model with Powdery Cusp Tips

 

CAUSE SOLUTION

Tooth contact with impression tray, or gauze of double bite tray causes water to leach out of the tray, dehydrating the stone.

  • Instruct patient to bite passively in centric occlusion when using dual arch trays.
  • Fill tray with sufficient amount of material.

Cast not made according to model preparation guidelines and lacks detail.

  • Provide as much information as possible to the lab. Indicate type of impression material (polyether or VPS), and whether or not the impression has been disinfected.

VPS
Hydrogen gas emission.

  • Follow manufacturer’s instruction for casting time.


Twitter
Divider

Customer Care

1 (800) 634-2249
Press 1 for technical support; Press 2 for ordering implants.

Divider

E-mail News

Stay in the know with exclusive e-mails from 3M ESPE.

Troubleshooting Topics