working casts and die systems
TRANSCRIPT
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WORKING CASTS AND DIE SYSTEMS
http://hi-dentfinishingschool.blogspot.com/
http://apexiondental.com/
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WORKING CASTS WITH A SEPARATE DIE
oThe simplest means•It keeps the relationship with the abutment
fixed and immovable
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Stone is added to the impression in small increments above the preparation
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TRAY IS TILTED TO FILL THE PREPARATION
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Stone is added to the impression so that the base of the set stone will be 1 inch
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The die is first trimmed on a model trimmer
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•A properly trimmed die handle is slightly larger in diameter than the preparation
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Improperly trimmed die with a handle that meets the preparation at an angle
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Handle should be 1 inch long
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The die is trimmed with an acrylic bur
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Shaping of the handle near the finish line is completed with a scalpel
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The die is smoothened below the finish line with the discoid end of a tanner carver
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The preparation finish line on the die should be red pencil outlined with a
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Die relief agent is painted on the preparation-20 to 40 mm
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WORKING CAST WITH A REMOVABLE DIE
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The die must return to their exact original positionsThe die must remain stable , even when invertedThe cast containing the dies must be easy to mount on the articulator
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FOUR SYSTEMSFOUR SYSTEMS
Straight dowel pinCurved dowel pinPindex system
Di-lok trays
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Reverse drill press is used that can be removed and replaced with great precisionImpression poured before positioning dowel pinsDrills parellel holes from underside Of the trimmed cast
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Pour the impression adding 20mm of stone beyond the edge of the tray—allow trimmgCast set in 60 minRemove the cast
-Wet the cast
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Cast should be 15mm thick , exclusive the teeth
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After trimming location of pin holes is marked with a pencil
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Pencil marks are placed under the illuminated dot
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Debris is removed from pin holesThe holes are refined with a hand reamer
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Cyanoacrylate cement is placed on the prior to cementing the pin tips
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Shorter pins are placed before the long pins
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White sleeves are placed on the long pins and gray sleeves on the short pins
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The bottom of the cost is lightly coated with petrolactum
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The ends of the gray sleeves are blocked with wax
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Utility wax is placed on the ends of the long pins
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A palatal \tongue filler is made of boxingwax and seated on the cast
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Boxing wax is applied around the cast
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The base is poured in microstone
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Cast is seated in the base formerWax is removed
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Saw cuts are marked with pencilCast is removed
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Dies are sectioned from underside and from occlusal aspect
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Large condensers are used to loosen the dies
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Mounted on an articulator
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Snap apart plastic tray with internal orienting grooves and notches to reassemble working casts and dies are used
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CURVED DOWEL PIN
DOWELS INCORPORATED BEFORE POURING THE IMPRESSINO
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WORKING CAST VERSES DIAGNOSTIC CASTS
Accuracy of the castErrors in CRrecord are significant in working castsKinematic face bow is usedReorganised occlusion by selective grinding and reorganising anterior guidance before tooth preparation
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REFERENCESREFERENCESFUNDAMENTALS OF FPD ----H.T .
SHILLINGBURGTHEORY AND PRACTICE OF FPD ---
TYLMANCONTEMPARORY FPD----
ROSENSTIEL
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THANK YOU