Porcelain-fused-to-metal (PFM) bridges consist of a metal core inside and a layer of porcelain outside blended together. PFM bridges look just like normal teeth.
BENEFITS:
Unlike purely metal tooth bridges, shade will be matched to the color of existing teeth.
Porcelain provides the most natural final appearance of any other dental bridge material.
PFM bridges can be used on both the hidden and prominent teeth.
PFM crowns are of better quality when they are high in noble metal inside.
They are durable and have enough the strength.
DOWNSIDE:
Porcelain can wear away at neighboring teeth.
More vulnerable to chipping and breaking than metal.
Porcelain's translucence sometimes allow the inside metal core to show through.
There is more a problem at the crown-gum line, especially if the gums recede over time.
If the patient has a missing tooth, the dentist will replace that tooth cavity with a dental bridge. The anchor teeth are prepared and an impression is made of the prepared teeth to send to the dental technician. A temporary plastic dental bridge is fitted over the prepared teeth to protect them while the final bridge is being manufactured.
The finished porcelain fused to metal bridge is tried in and the bite adjusted if necessary.
Once the fit, shape and color of the bridge is satisfactory the dental bridge is cemented in place permanently. A very natural looking end result is achieved.
Source= http://www.turkeyestheticdentistry.com/porcelainfusedtometal-pfm-bridges.html
