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Flashcards in Sweep Deck (30):
1

Water based, Acid base rxn, Adheres directly to tooth

RMGI, GI

2

Polymer based, free radical set rxn, requires adhesives

Composite, compomers

3


Ionomers
attach by

chelating with HA surfaces
(metal ions)

4

Ionomers
need a ------ dentine surface with
exposed =======

clean intact

mineral

5

Adhesives need a ------ dentin surface with
exposed ---------

demineralized

collagen

6

Conditioners (used with Glass
ionomers
)


Mild organic acids

Solublizes
smear layer
•Remove smear layer

Leave smear plugs intact

Does not
demineralize
dentin
or enamel

Cleans surface

7


Etchant (used with composite
materials)


Inorganic acid

35% phosphoric acid

Completely removes smear
layer and plugs

Demineralizes
surface dentin (2-
10 μ
m)

Leaves a collagen rich surface with
numerous pores

8

Gi powder is

nonsilanated

9

GI GLASS IONOMER REACTION

GI mix applied

Acid matrix dissolves
periphery of glass

Glass releases Ions

Ca
+2
, Al
+3
, F
-

Divalent Ca ions
quickly chelate with
acid polymer chains

10

GI GLASS IONOMER REACTION

Next 24
-72 hours

Al
+3
replace

Ca
+2

Increase strength

F
-
released

11

GI Acid side groups
also can

Chelate with

glass

Chelate with HA

12

RMGI

Modified Liquid

35% water

35% methacrylate modified
Polyacid
copolymers

Long chain polymers

Carboxylic acid reactive groups

+ Methacrylate
reactive group


30% HEMA

pH = 2.0

13

RMGI: swelling/shrinking

Polymerization
shrinkage

swelling from water
sorption
– zero net
dimensional change

14

RMGI free radical rxn

occurs quickly to protect from early solubility

15

RMGI improvements

ADVANTAGES OF
GI AND RMGI

Provide a good seal between dentin and restorative

Ionic bonding “chelation”

Have some recurrent caries inhibition potential

Rarely see caries around GIs or RMGIs

RMGIs have improved solubility resistance (
vs GI)

RMGIs have improved strength but less stiffness (
vs GI)

RMGIs have improved optical properties (
vs G

16

When excavating caries, clear

DEJ first

17

Conventional class V grooves

incisal gingival, just inside DEJ

18

CLASS V DIMENSIONS


Gingival Margin follows gingival @ ½
mm above FGM

Incisal
margin concentric with gingival
margin 1.5 mm I
-G height

Axial depth-
1.2 mm @ incisal
and 1 mm
@ gingival

Gingival floor follows curvature of tooth

Mesial
distal length
–extend to line
angles of tooth

90°
cavosurface
margins

19

Pulp pain is usually

sharp

20

Dentin Bonding Systems/Sealers


Optibond
Solo Plus/Gluma

21


If RDT is 0.5-
2.0 mm


Base (replaces missing
Dentin)

GI (base)

ZnPO4 (base)

Liner

Copal varnish

Adhesive

22

Bases and Liners
– often only differ
by

P/L ratio

23

Acid of GI dissolves glass, Calcium chelates with

acid polymer chains. Aluminum then replaces over the next 3 days.

24

GI acid side chains can also chelate with

glass, HA

25

CaOH2 liner


Ca
+
ions act to crosslink polyphenol groups

Insulator

26

B&T

(base and temporary)

Reinforced fillers (PMMA beads
-powder)

ZnO (powder)

Eugenol (liquid) oil of clove

27

ZOE cannot be used

under composite

28

Bend a pin when doing an

RUC

29

Types of pins

Friction locked, cemented, threaded

30

2 – 2 – 2 - 2 Rule:

2mm pin hole depth
2mm pin hole depth
2 drill diameters inside DEJ
2 drill diameters inside DEJ
2mm length of pin
2mm length of pin
2mm amalgam over pin
2mm amalgam over pi