Flat pulal floor also resistance feature QUESTION how to prevent proximal

Flat pulal floor also resistance feature question how

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Flat pulal floor also resistance featureQUESTION: how to prevent proximal displacement of Cl II filling– occlusal dovetailQUESTION: What’s the best way to prevent proximal dislodgement/fracture of class II amalgam filling?• Retentive grooves*or (dovetail )• converging axial walls (B&L walls)• depth of prepQUESTION: Proximal resistance form of amalgam restoration comes from what?a. convergence of buccal/lingual wallb. retention grooves in axiobuccal/axiolingual walls - for proximal resistance true
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c. Dovetail - provides retention formresistance form is by rounding of axiopulpal line angle and flat pulpal floorQUESTION: Mesial and distal walls of class I amalgam must be divergent not to undermine marginal ridges trueRETENTION: 1st = BL walls converge, 2nd = Retention grooves/Occlusal dovetailRESISTANCE: 1st = Flat floors, rounded angles (bevel in axiopulpal line angles) 30QUESTION: How to account for mesial concavity on maxillary 1st premolar when restoring with amalgam:answer custom wedge or wedge wedging QUESTION: BWX, Tooth #18 has mesial amalgram restoration with overhang and very light contact. – ! (or poor adaptation of matrix band) trueQUESTION: premolar restored with open contact, why?Wedge not placed right-I think ive seen this question beforeMatrix band was not well adaptedQUESTION: Put wedge after matrix trueQUESTION: From pt images, Which amalgam filling has the lowest Copper content?One that looks corroded.QUESTION: a pt presents with amalgams restorations in good shape, the dentist suggest to change them for composites due to systemic toxicity of the amalgam what ethic principle is there or the dentist is violating what principle:,veracity,QUESTION: Definition of Veracity - doctor lied to patient about amalgam should be replaced with composite, because amalgam causes toxicityGold:Malleability – deform (without fracture) under compressive strength; ability to form a thin sheet; gold is malleableGreatest malleability to least: gold, silver, lead, copper, aluminium, tin, platinum, zinc, iron, and nickelDuctilty – deform (without fracture) under tensile strength; ability to stretch into wiregreatest ductility to least: gold, silver, platinum, iron,nickel, copper, aluminium, zinc, tin, and lead.Gold inlay/onlay – divergent walls (2-5 degrees per wall), 30 degree bevel marginsQUESTION: onlay /retention:2 to 5 degrees of taper per wall, as long a wall as possible, . primary retention is from wall height and taper. Secondary retention is from retention grooves, skirts, and groove extensions
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QUESTION: What is the hardest type of gold?Gold Type IVQUESTION: When do use base metal apposed to gold…. Long span bridges ?QUESTION: Ductility –Golds ability to be worked into different shapes trueQUESTION: only advantage of porcelain over gold :esthetics.
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