resto.ppt for education
DESCRIPTION
about restorations in amalgam pin retained restorations which needed more retention and resistance to the restorationsTRANSCRIPT
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Defined as any restoration requiring the placement of one or more pins in the dentin to provide adequate resistance and retention forms for tooth with extensive caries or fractures
Used whenever adequate resistance and retention forms cannot be established with slots, locks, or undercuts only.
It has a greater retention than those using boxer or relying solely on bonding system
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A. GROSSLY MUTILATED TEETH B. EXTENDED PREPARATIONS
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D. Extensive class V restoration
C. Cores for full coverage restoration
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Fine, strong, long term restoration/build-up
Less expensive than a crown
Completed in one appointment
Conservasation of tooth structure
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Dentinal microfracture
Microleakage around pin
Perforation of pulp or external tooth structure
Decrease strength of amalgam
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Cemented pins/Friction-locked pins/Self-threading pins
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rarely used today Pin hole usually large Cemented with
zinc phosphate polycarboxylate
cement LEAST RETENTIVE pin is 0.002 smaller than the
channel 2mm into tooth with
3mm post above tooth
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Rarely used Hole in tooth is smaller than cemented Pin is tapped into place MORE RETENTIVE than cemented 3mm into tooth structure & 3mm post above pin is 0.001 larger than the channel
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Hole in tooth slightly smaller than pin
Retained by threads on pin More than TWICE AS RETENTIVE as
others 2mm into tooth,
2mm post above pin is 0.001-0.004 larger than the channel
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Correct number of pins to place depends upon:
Size of pins Larger diameter ▪ more retention ▪ greater inter-pin distance
*as far as possible 1 pin must be placed for each missing cusp and 1 pin for each missing proximal surface
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Within reason, increasing the number of pins increases the retentiveness of the restoration.
With more pins: risk of crazing increases available dentin decreases strength of the restoration
decreases
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At the proximal line angles of molars
At the proximal line angles or cusp tips of premolars
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interproximals furcation areas near root concavities (M of mx 1st PM)
in demineralized dentin
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At least 0.5mm from DEJ (preferably 1.0mm) in the dentin
If below enamel on tooth, measure 1.0mm from edge of tooth
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Pins are made up Pins are made up of of TITANIUMTITANIUM OR OR STAINLESS STEEL STAINLESS STEEL and are and are gold gold platedplated. .
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7mm long After placement, the pin is reversed 1/4th turn to reduce stresses on dentin
Pin height can be adjusted appropriately
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Available in varying lengths During pin placement when the pin
reaches the bottom of the pin hole, the head automatically shears off, leaving a portion projecting from dentin
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It consists of 2 pins connected by means of a joint which serves as a shear line for peripheral pin
Total length is 9mm and 2 pins are about 4mm each
The handpiece need not be reloaded during insertion of more than 1 pin
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They have a plastic sleeve that fits into the latch type contra angle handpiece or a special plastic hand wrench
Self shearing Pin engages the dentin and the plastic
sleeve can be discarded Can align well into pin channels
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Similar to link series design Self shearing Available as single or 2 in 1 pins The major difference in this pin design is that
pins have sharper threads and a tapered tip to decrease dentinal stresses while seating