robbypowell's version from 2016-12-12 01:17

Lab 5

Question Answer
State the 4 indications of flowable compositesIndications: -PRR, -Microabrasion dentistry, -As a cavity lining agent (prior to placement of a packable composite), & Pit and fissure sealants
State the contraindications of flowable compositesHigh stress (occlusally loaded surfaces) (do not have the strength of higher filled, conventional composites, nor their wear resistance.)
how does the composition of flowable composites differs from that of conventional composites; how does this affect shrinkage? strength?Lower filler content; Greater shrinkage; Less Strength (every kind of strength)
How does the composition of a PACKABLE composite differ from traditional composite?Higher Filler Content
How do packable composites compare to traditional composites in terms of shrinkage?Lower shrinkage (greater filler)
Packable composites are indicated (fine to use) in ______ teeth in order to get an inter proximal contact, however they are not indicated in _______ teeth because their filler content makes them less estheticPosterior (indicated for Class 2); Anterior (contraindicated due to esthetics)
Are packable composites truly "condensable" like amalgam?No not technically condensable (just denser, more rigid and different feel, more amalgam-like texture)
A greater ______ is typically seen in bulk-fill composites to allow light to penetrate; also a higher concentration of ______Translucency (greater); Photoinitiators (higher concentration)
How deep does a bulk-fill composite have to cure to be considered "bulk-fill"4mm (4-5 is the range of current products)
List 2 possible disadvantages of using bulk film in a posterior toothrisk of Gap Formation in floor, risk of uncured composite in floor (would be irritant to tooth)
T/F: you must be careful to match the bulk-fill composite and curing light manufacturers because these often use proprietary photoinitators and curing lightsTrue
Glass ionomer (conventional) has _____ bonding to tooth, _____ (high/low) early strength, and CTE that is _______ (similar/dissimilar) to tooth structureChemical Bonding (acid-base chelation); Low (early strength); CTE is similar to tooth (one of best compatibilities of thermal expansion)
What component is absolutely required for a glass ionomer reaction to take place?Water
T/F: CERMET GI's have improved wear resistance and can be used on the occlusal surfaces of teethFalse (do not have improved wear resistance)
______ acid is used for tooth conditioning prior to placement of GI... does it remove smear layer? does it remove smear plug?Polyacrylic acid; removes smear layer; does not remove smear plugs
advantage of RMGI’s over conventional glass ionomers with respect to strength; fluoride release; bond strengthImproved early strength; equivalent fluoride release; similar bond strength (to conventional GI)
Is it still recommended to place varnish/glaze protectant over RMGI, as it is in GI?Yes