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HR

The crown looks fine but just doesn't fit!

Sometimes this can occur when the plastic impression tray is a bit too small for the arch and or the patient may have bitten too hard. If you can see the tray through the impression material(see fig#1 - triple tray and #2 quadrant) then the tray has possibly flexed. The flex can be really slight so the crown appears fine but fits like it was made on a different die.
We have found a solution for this problem...... metal impression trays. There are many options but we like a disposable tray made by Clinitions choice."The X-treme". 1-800265-3444.

Mike and Ray
bit impression figure 1
bit impression figure 2
figure #1
figure #2
yellow pad
Are contacts sometimes open or too tight?

If the contacts of a crown are perfect on the model and either too tight or open in the mouth, then the teeth may have moved either because the temp was a bit tight or loose or the model system the lab uses could be inaccurate. The model system we use is expensive and extremely accurate, it's the most like a solid model we've ever found.
When we adjust the contacts we check with .5 micron shim paper for the highest accuracy.

Mike and Ray