Difference between metal and porcelain crowns?
All-Porcelain Crowns
General
Description
Inlays, onlays, crowns and
aesthetic veneers
May fracture under heavy
biting loads
Strength depends on adequate
porcelain thickness; it
requires moderate tooth
reduction during preparation
Highly resistant to wear, but
porcelain can rapidly wear
opposing teeth if its surface
becomes rough
Color and translucency mimic
natural tooth appearance
Cost is about 10% higher; requires at least
two office visits and
laboratory services
Porcelain Fused to
Metal Crowns
Porcelain is fused to an
underlying metal structure to
provide strength to a crown or
bridge
Crowns and fixed bridges
Very strong and durable
Including both porcelain and
metal creates a stronger
restoration than porcelain
alone; moderately aggressive
tooth reduction is required
Highly resistant to wear, but
porcelain can rapidly wear
opposing teeth if its surface
becomes rough
Porcelain can mimic natural
tooth appearance, but metal
limits translucency.
Requires at least two office
visits and laboratory services
I was able to find this very good comparison I did not copy every thing so if you want to review the complete list note the link below.