SCREW RETAINED RESTORATION
Screw retained PFM
A screw retained restoration bypasses the need for a separate abutment
and screws directly to the implant. Minimum height requirement from the head of the implant to the opposing occlusal surface is 4 mm. Single crowns to a full arch restoration
are possible. Another benefit of a screw down crown or bridge is the retrieve ability
for repair, maintenance or future design changes. Material choice ranges from full gold to all ceramic restorations.
Screw retained FGC
Implant placement has to be almost perfect for this type of restoration
to work successfully since the screw access hole has to come through the lingual
for anterior teeth and the central fossa for posterior teeth. The screw access hole can be filled with composite after placing a cotton ball in to the access
channel to protect the screw head.
One piece PFM
Expect to spend more time adjusting proximal and occlusal contacts because
in most instances no temporary restoration was fabricated and
adjacent teeth might have shifted from the time of impression taking to delivery.
The occlusal contact should be very light to just out of occlusion because
the periodontal ligament of the remaining natural teeth allows the natural
teeth to depress slightly during mastication in to their bony sockets and
implants don't have a periodontal ligament to allow movement. Only one occlusal
contact directly over the implant is recommended. No lateral interference
of any kind to minimize off axis loading of the implant.