Composites

Question 1

resin is a ______

___ polymer

Answer 1

dimethacrylate

vinyl polymer

Question 2

fillers are inorganic/mineral ceramic ______;
______ and resist ____;
___% of composites are fillers

Answer 2

SiO2, ZO2, Ba glass
strong, wear
50%

Question 3

coupling agents are ____

Answer 3

silanes

Question 4

molecules that in one end covalently bond to the resin and covalently bond to inorganic filler in the other

Answer 4

silanes

Question 5

silanes provide _________

Answer 5

mechanical continuity

Question 6

without silanes at _____ interface, composite material would be ____

Answer 6

resin-filler, weak

Question 7

_____ are scavengers of ___ _____ that prevent premature polymerization of resin; give ________

Answer 7

inhibitors, free radicals, stability on storage

Question 8

UV stabilizers are molecules that absorb UV and prevent _____ of resin during use

Answer 8

yellowing

Question 9

a unified combination of two or more materials designed to have better properties over individual components

Answer 9

composite

Question 10

uses of composite materials

Answer 10

• pits and fissure sealants
• resin composite fillings
• luting cements

Question 11

constituents of resin composites (6)

Answer 11

(DFCIIU)

• dimethacrylate polymers
• fillers (organic)
• coupling agent
• (polymerization) inhibitors
• initiator/activator systems
• UV stabilizers

Question 12

what is a silane?

Answer 12

a coupling agent

Question 13

function of dimethacrylate resins

Answer 13

give rigid material, toughness

Question 14

common examples of dimethacrylate resins

Answer 14

Bis-GMA, UDMA with TEGDMA

Question 15

____ start polymerization of resin and are usually visible for light curing

Answer 15

initiators

Question 16

particulate fillers can have ______ or _____ size

Answer 16

microscopic, nanoscopic

Question 17

nanoscopic filler were developed to improve _____ and _____

Answer 17

polishing, wear

Question 18

alternate names for metal-ceramic restorations

Answer 18

MCR or Porcelain-fused-to-metal (PFM)

Question 19

metal-ceramics are a combination of…

Answer 19

• tough metallic core

- wear-resistant/hard and aesthetically pleasing ceramic crown on top of metal

Question 20

veneers are bonded to ______/_____ by applying _______ between the two

Answer 20

enamel/dentin, adhesive

Question 21

micro-abrasions on the metallic alloy that improve the friction/retention of the ceramic.

Answer 21

micromechanical bonding

Question 22

obtained when firing the porcelain at high temperatures at the oxides of the ceramic react with the oxide on the surface of the alloy

Answer 22

chemical bonding

Question 23

functions of fillers

Answer 23

• improving strength and wear resistance
• less shrinkage on setting
• radiopacity