Bridge return to dentist from lab with different degree of color although the shade is the same, the cause:
- A. Thin metal framework.
- B. Different thickness of porcelain.
- C. Thick opaque.
The most likely cause of a bridge returning from the lab with a different degree of color despite having the same shade chosen is: B. Different thickness of porcelain.
Here's why:
- Thin metal framework:
While a thin metal framework can affect the overall translucency of the bridge, it's less likely to cause a significant difference in color within the same shade range.
- Different thickness of porcelain:
Variations in porcelain thickness can significantly alter the translucency and shade perception. Thicker porcelain allows less light to pass through, resulting in a more opaque and potentially darker appearance. Conversely, thinner porcelain allows more light to pass through, giving a lighter and more translucent look.
- Thick opaque:
This option is too vague and doesn't provide enough information to be considered the most likely cause.
Additional Factors:
Here are some additional factors that could contribute to color discrepancies in bridges:
- Changes in firing temperature:
Slight variations in the firing temperature during the porcelain manufacturing process can affect the final color.
- Type of porcelain used:
Different porcelain formulations can have different optical properties and translucency levels.
- Lighting conditions:
The color of the bridge can appear different under different lighting conditions.
To accurately diagnose the cause of the color difference, the dentist would need to carefully examine the bridge under controlled lighting conditions and compare it to the original shade guide. If the difference is significant and unacceptable, the bridge may need to be remade with a more consistent porcelain thickness.
