full metal restoration

the restoration with the most retention is

• full metal
• partial coverage
• full ceramic
• pfm

overcontoured crowns are most often result of

• the need for added retention
• overbuilding by dental technicians
• insufficient tooth reduction
• periodontal consideration

the amount of occlusal reduction to the functional cusp for a full metal preparation of an upper 2nd molar is

• 1mm
• 1.5mm
• 2mm
• 0.5mm

additional retention can be achieved by

• excessive occlusal reduction
• grooves and boxes
• supra gingival finish line
• tapered prepration

Which of the following factors mostly affect retention in full metal restoration

• degree of taper
• rounding of line angles
• position of extra grooves
• degree of tooth inclination

which of the following is incorrect regarding opening the proximal contact

• fine tapered stone is needed
• wrapping a metal band around the adjacent tooth
• leaving thin shell of enamel of prepared tooth to prevent injury to the adjacent
• placing the tone parallel to the occlusal surface of the tooth

enumerate contradiction with full metal restoration

arrange the following according maximum resistance & retention

• full metal restoration > partial coverage > full ceramic > full pfm
• full metal restoration > laminate veneer > full pfm > full ceramic
• partial coverage >full metal restoration> full porcelain > full pfm
• full metal restoration > overlay > full porcelaine >full pfm

enumerate Advantages of full metal restoration

PFM restorations is more conservative than full metal restorations

• true
• false