- A sectional denture is constructed in two parts that link together and utilize the undercut areas to aid retention.
- A split pin and hollow tubing may be used to retain the two parts of a sectional denture together.
Sectional dentures are able to utilize undercuts around the teeth and associated soft and hard tissues which would not be available to a conventional partial denture which used one path of insertion and removal.
A split pin occupies less space than the incorporation of a lock and bolt arid this therefore looks better especially in the replacement of anterior saddles.
The split pin arrangement is small and therefore can be used at the front of the mouth. It is technically easier to construct than the lock and belt.
The continual frictional contact between the pins and the hollow cylinder results in wear and eventually the retention is lost. This may be remedied by forcing the pins apart to reactivate them.
1. An accurate recording of the hard and soft tissues, correctly duplicating the undercuts present is required.
2. The position and angulation of the split pins in relation to the occlusion and path of insertion of the second unit needs to be prepared using e parallelometer_
3. The split pin which is cast as part of the cobalt/chrome framework makes frictional contact within a hollow metal tube which is contained within the acrylic portion of the denture.