Violation
A fracture in the porcelain of a porcelain fused to metal crown may be caused by
lack of parallelism of axial walls
sharp line angles in the metal under the porcelain.
sharp line angles in the tooth preparation
excessive metal thickness
A fracture in the porcelain of a porcelain fused to metal crown may be caused by
lack of parallelism of axial walls
sharp line angles in the metal under the porcelain.
sharp line angles in the tooth preparation
excessive metal thickness