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9 Cards in this Set
- Front
- Back
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What is the rationale for making a custom tray?
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-Impression tray with uniform relief form impression material will rsult in a much more accurate final impression (important in FPD construction). Uses less impression material due ot more close "fit" of tray to teeth (2-3 mm) and saves money; tray is more rigid
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What are you looking for when you inspect VPS impression for a FPD?
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-Must have recorded both preps, the edentulous ridge, and all teeth in the arch
-Margins should be evident on both preps, circumferentially around preps -Must have recorded unprepared root structure apical to margins |
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What is the purpose for making interocclusal records?
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-Allow opposing casts to be articulated accurately at some pre-determined position (CO or MI)
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Material selection depends on locaiton of abutment teeth, If occlusion is table you can hand-articulate the casts (T/F)
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-Only first statement is correct
-Only second statement is correct -Both statement is correct but not related -Both statement is correct and related ******** -Both statement are incorrect, but related |
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How high should the working cast be trimmed form the base?
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10-12 mm from the gingival crest to base
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What are the clinical considerations for taking the impression for FPD?
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-MUST manage the saliva, hemorrhage, tongue, cheeks, patients
-Do not let dry field become contaminated with saliva, hemorrhage -Do not let tongue/cheek contact preps while impression -Get an assistant |
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IF there is a terminal FPD, you need a rigid recording material (T/F)
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True: wax is not dimensionally stable to ship)
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What are the materials you can use to make the interocclusal records for FPDs?
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-ZOE paste is accurate but very rigid (fracture easily)
-PMMA resin (GC pattern resin) is accurate, rigid, hard to manage -Regisil (flowable VPS), not accurate fitting with opposing cast from alginate impression |
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Describe the technique in Custom Tray Fabrication?
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-Draw extend of tray extension on DX cast
-Block out any ST undercuts -Adapat 2 thickness of soft pink base palate (2-3) and 3-occlusal stops -Plan vaseline -Adapt Triads Tru-Tray into occlusal stop and over cast -Cure the triad with water -Trim sharp edges -Try in patient to determine accuracy and border extensions -Paint intaglio surface of tray -Make sure tray sites on tissue distal to terminal molars and paint 2-3 mm on external border tray |
