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.
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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.
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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.
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VPS
Hydrogen gas emission. |
- Follow manufacturer’s instruction for casting time.
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