Restorative Composite ResinsRestorative Composite Resins
Col Kraig S. VandewalleUSAF Dental Evaluation & Consultation Service
Official Disclaimer
• The opinions expressed in this presentation are those of the author and do not necessarily reflect the official position of the US Air Force or the Department of Defense (DOD)
• Devices or materials appearing in this presentation are used as examples of currently available products/technologies and do not imply an endorsement by the author and/or the USAF/DOD
Overview
• Direct restoratives– composition– classification– performance factors
• Flowable
• Packables
Click here for briefing on composite resins (PDF)
Composite• Material with two or more distinct substances
– metals, ceramics or polymers
• Dental resin composite– soft organic-resin matrix
• polymer
– hard, inorganic-filler particles• ceramic
• Most frequently used– esthetic-restorative material
Leinfelder 1993
History
• 1871 – silicates– alumina-silica glass &
phosphoric acid– very soluble– poor mechanical properties
• 1948 - acrylic resins – polymethylmethacrylate– high polymerization shrinkage
Rueggeberg J Prosthet Dent 2002
History(cont.)
• 1962 – Bis-GMA– stronger resin
• 1969 – filled composite resin– improved mechanical properties– less shrinkage– paste/paste system
• 1970’s – acid etching and microfills• 1980’s – light curing and hybrids• 1990’s – flowables and packables• 2000’s – nanofills
Rueggeberg J Prosthet Dent 2002
Indications
• Anterior restorations
• Posterior restorations– preventive resin– conservative class 1 or 2
Advantages
• Esthetics
• Conservation of tooth structure
• Adhesion to tooth structure
• Low thermal conductivity
• Alternative to amalgam
Disadvantages
• Technique sensitivity
• Polymerization shrinkage – marginal leakage– secondary caries– postoperative sensitivity
• Decreased wear resistance
Composition• Resin matrix
– monomer– initiator– inhibitors– pigments
• Inorganic filler– glass– quartz– colloidal silica
• Coupling Agent
OCH2CHCH2O-C-C=CH2CH2=C-C-O-CH2CH-CH2O -C-
CH3 CH3
CH3
CH3OH OH
O O
Bis-GMA
Phillip’s Science of Dental Materials 2003
Monomers• Binds filler particles together• Provides “workability”• Typical monomers
– Bisphenol A glycidyl methacrylate (Bis-GMA)
– Urethane dimethacrylate (UEDMA)
– Triethylene glycol dimethacrylate (TEGMA)CH2=C-C-O-CH2CH2-O-C-NHCH2CH2CHCH2-C-CH2-NH-C-
CH3
CH3
OCH2CH2O-C-C=CH2
CH3
O OOO
CH3
CH3
OCH2CHCH2O-C-C=CH2CH2=C-C-O-CH2CH-CH2O -C-
CH3 CH3
CH3
CH3OH OH
O O
CH2=C-C-O-CH2CH2-OCH2CH2
CH3
OCH2CH2O-C-C=CH2
CH3
O O
Monomers• Bis-GMA
– extremely viscous• large benzene rings
– lowered by adding TEGDMA• freely movable• increases polymer conversion• increases crosslinking• increases shrinkage
CH2=C-C-O-CH2CH-CH2O -C- OCH2CHCH2O-C-C=CH2
CH3 CH3
CH3
CH3OH OH
O O
Filler Particles
• Crystalline quartz– larger particles– not polishable
• Silica glass– barium– strontium– lithium– pyrolytic
• sub-micron
Phillip’s Science of Dental Materials 2003
Filler Particles
• Increase fillers, increase mechanical properties– strength– abrasion resistance– esthetics– handling
• 50 to 86 % by weight• 35 to 71% by volume 0
0.5
1
1.5
2
Fra
ctur
e T
ough
ness
0 28 37 48 53 62
% Filler Volume
Ferracane J Dent Res 1995
Coupling Agent
• Chemical bond– filler particle - resin matrix
• transfers stresses
• Organosilane (bifunctional molecule)– siloxane end bonds to hydroxyl groups on filler– methacrylate end polymerizes with resin
CH3-C-C-O-CH2-CH2-CH2-Si-OH
CH2
O OH
OH
Bonds with filler
Silane
Bis-GMABonds with resin
Phillip’s Science of Dental Materials 2003
Inhibitors
• Prevents spontaneous polymer formation– heat– light
• Extends shelf life
• Butylated Hydroxytoluene
Phillip’s Science of Dental Materials 2003
Pigments and UV Absorbers
• Pigments– metal oxides
• provide shading and opacity• titanium and aluminum oxides
• UV absorbers– prevent discoloration– acts like a “sunscreen”
• Benzophenone
Phillip’s Science of Dental Materials 2003
Visible-Light Activation• Camphorquinone
– most common photoinitiator• absorbs blue light
– 400 - 500 nm range
• Initiator reacts with amine activator
• Forms free radicals
• Initiates addition polymerization
OCH2CHCH2O-C-C=CH2CH2=C-C-O-CH2CH-CH2O -C-
CH3 CH3
CH3
CH3OH OH
O O
Bis-GMA
Polymerization
• Initiation– production of reactive free radicals
• typically with light for restorative materials
• Propagation– hundreds of monomer units– polymer network– 50 – 60% degree of conversion
• Termination
Craig Restorative Dental Materials 2002
C=C
C=C C=C
C=C C=C C=C C=C
C=C C=C
C=C C=CC=C C=C
C=C C=C
C=C C=C
C=C
C=C
C=CC=C
C=C
C=C
C=C C=C C=CC=C C=C
C=C
C=C
polymerization
Ferracane
Classification System
• Historical
• Chronological
• Based on particle size– traditional– microfilled– small particle – hybrid
Phillip’s Science of Dental Materials 2003
Traditional (Macrofilled)• Developed in the 1970s• Crystalline quartz
– produced by grinding or milling– large - 8 to 12 microns
• Difficult to polish– large particles prone to pluck
• Poor wear resistance• Fracture resistant• Examples: Adaptic, Concise• Suitable for Class 3, 4 and 5
Phillip’s Science of Dental Materials 2003
Microfills
• Better esthetics and polishability• Tiny particles
– 0.04 micron colloidal silica– increases viscosity
• To increase filler loading– filler added to resin– heat cured– ground to large particles– remixed with more resin and filler
Ground polymer with colloidal silica (50 u)
Polymer matrix with colloidal silica
Phillip’s Science of Dental Materials 2003
Microfills• Lower filler content
– inferior properties• increased fracture potential• lacks coupling agent• lacks radiopacity
• Linear clinical wear pattern
• Suitable for Class 3, 5– exceptions with reinforced microfills
• Class 1 or 2
Click here for table of microfills
Small Particle
• 1 - 5 micron heavy-metalglasses
• Fracture resistant
• Polishable to semi-gloss
• Suitable for Class 1 to 5
• Example: Prisma-Fil
Silane-coated silica or glass (1-5 u)
Polymer matrix
Phillip’s Science of Dental Materials 2003
Hybrids
• Popular as “all-purpose”– AKA universal hybrid, microhybrids,
microfilled hybrids
• 0.6 to 1 micron average particle size– distribution of particle sizes
• maximizes filler loading
– microfills added • improve handling• reduce stickiness
Silane-coated silica or glass
Polymer matrix with colloidal silica
Phillip’s Science of Dental Materials 2003
Hybrids
• Strong
• Good esthetics– polishable
• Suitable– Class 1 to 5
• Multiple available
Click here for table of hybrids
Property Traditional MicrofilledSmall
ParticleHybrid
Compressive strength (MPa)
250-300 250-300 350-400 300-350
Tensile strength (MPa) 50-65 30-50 75-90 70-90
Elastic Modulus (GPa) 8-15 3-6 15-20 7-12
Coefficient of Thermal Expansion (10-6/ºC)
25-35 50-60 19-26 30-40
Knoop Hardness 55 5-30 50-60 50-60
Phillip’s Science of Dental Materials 2003
Table of Properties
Newer Classification System
• Based on particle size– megafill
• 0.5 - 2 millimeters
– macrofill• 10 - 100 microns
– midifill• 1 - 10 microns
– minifill• 0.1 - 1 microns
– microfill• 0.01 - 0.1 microns
– nanofill• 0.005-0.01 microns
• Most new systems– minifillers
• Newest trend – nanofillers– trimodal loading
• prepolymerized
Bayne JADA 1994
Midi-filler -2 um (beachball)
Mini -filler -0.6 um (canteloupe)
Nanofiller -.02 um (pea)
Microfiller -.04 um (marble)
Relative Particle Sizes (not to scale)
Nanofill vs. Nanohybrid
• Nanofills– nanometer-sized particles throughout
matrix
• Nanohybrids– nanometer-sized particles combined with
more conventional filler technology
Swift J Esthet Restor Dent 2005
Nanofilled Composite
• Filtek Supreme (3M ESPE)
• Filler particles– filled: 78% wgt– nanomers
• 0.02 – 0.07 microns
– nanocluster• act as single unit
– 0.6 – 1.4 microns
Click here for technical profile Click here for DECS evaluation
Performance Factors
• Material factors– biocompatibility– polymerization shrinkage– wear resistance– polish mechanisms– placement types – mechanical & physical properties
Biocompatibility
• Tolerated by pulp– with good seal
• Rare allergic reactions– HEMA
• Cytotoxicity– short lived
• not a chronic source
• Degree of cure important– decrease free monomer
Phillip’s Science of Dental Materials 2003
Systemic• Estrogenic effects seen in cell cultures
– impurities in Bis-GMA-based resins• Bis-phenol A in sealants
– Olea EHP 1996» click here for abstract
– however, insignificant short-term risk
• literature review– Soderholm JADA 1999
» click here for abstract
Polymerization Shrinkage
• Significant role in restoration failure– gap formation
• secondary caries formation• marginal leakage• post-operative sensitivity
• Counteract– lower shrinkage composites– incremental placement
Composite Wear• Less wear
– small particle size• less abrasion
– heavier filled• less attrition
– non-contact areas• 3 - 5 times less
– less surface area– anterior location
• premolars vs. molars
Hilton Oper Dentistry: A Contemporary Approach 2001
Composite Wear
• Reduced wear with smaller particles– less plucking leaving voids
• Higher filler loads for enhanced properties– correlations between wear and fracture
toughness and flexure strength
• Higher cure of resin matrix to resist scratching and gouging by abrasives
Hilton Oper Dentistry: A Contemporary Approach 2001
Polish Mechanisms
• Acquired polish– clinician induced
• Inherent polish– ultimate surface
• Microfills– high acquired, high inherent
• similar resin matrix and fillers wear more evenly
• Hybrids– high acquired, acceptable inherent
Adept Report 1992
Small Particle Hybrid Microfilled Composite
Time
Acquired Polish
Inherent Polish
Polish Mechanisms
Adept Report 1992
Linear wear pattern
Shaded vs. Anatomic Placement
• Shaded– shade selected from middle
third of tooth– shade guide gives recipe for
multiple shades
• Anatomic– highly chromatic dentin
matched to existing dentin– colorless enamel replaces
existing enamel
Click here for details
Shaded Anatomic
Trans Enamel
A3/A4 Dentin
Enamel Value
Enamel Value
A1 Dentin
A1 Enamel
Dentists Ceramists“Match Shade” “Create Shade”
Trans Enamel
Placement TypesComposite Brands
• Shaded– 4 Seasons (Ivoclar Vivadent)– Esthet-X (Dentsply)– Filtek Supreme (3M ESPE)– Point 4 (Kerr)– Venus (Heraeus Kulzer)– Renamel (Cosmedent)– Gradia Direct (GC)
• Anatomic– 4 Seasons (Ivoclar Vivadent)– Vitalescence (Ultradent)– Miris (Coltene/Whaledent)
Jackson PPAD 2003
Composite Selection
• Anterior/stress (Class 4)– hybrid
• mini- or midi-fill
– hybrid/microfill veneer combo
• Anterior/non-stress (Class 3 or 5)– hybrid
• mini-fill
– microfill
Selecting a Brand
• Contents of kit– shades– bonding agent– unit-dose compules vs syringes
• Indications– anterior, posterior, both?
• Cost of kit– refills Click here for synopsis of
restorative composite resins
Government Price($/gm of refill resin)
6.3 6.5
7.588.49 8.53 8.79 8.9 9
9.4410.15 10.21
11.37
9.95
4 Sea
sons
Gradia
Post
Gradia
Ant
Hercu
lite
XRV
Prodig
y
Point 4
Z100
Venus
Vitale
scen
ce
Esthet
XZ25
0
Prem
ise
Suprem
e
Prices current as of Jan 05
Selecting a Brand
• Results of lab and clinical studies
• Compositional characteristics– % filler content– average filler particle size
Click here for synopsis of restorative composite resins
0
1
2
3
Venu
s
Supr
eme
4 Sea
sons
Enam
el
Vital
esce
nce
Gradia
Pos
t
Dentin
Gradia
Ant
Radiopacity(mm of aluminum)
Source: USAF DECS Project 03-024
ISO Requirement
Surface Hardness(24 hrs)
0
10
20
30
40
Z250
Suprem
e
Vitale
scen
ce
Venus
Esthet
-X
Point 4
4 Sea
sons
Prem
ise
Gradia
Post
Gradia
Ant
Horizontal lines connect nonsignificant differences (p<0.05); N=5
Source: USAF DECS Project 03-37KHN
Flexural Strength(24 hrs)
0
20
40
60
80
100
120
140
160
Supreme 4Seasons
Venus GradiaAnt
Premise GradiaPost
Horizontal lines connect nonsignificant differences (p<0.05); N=5
Source: USAF DECS Project 03-037
Volumetric Shrinkage
0
1
2
3
4
5
A110
Gra
dia D
irect
Z100
Prem
ise
4 Sea
sons
Venus
Renew
Esthet
-X F
low
%
Horizontal lines connect nonsignificant differences (p<0.05); N=5
Source: USAF DECS Project 03-037
Packable Composites
• Marketed for posterior use– increase in viscosity
• better proximal contacts? • handle like amalgam?
• Subtle alteration of filler– shape– size– particle distribution
• Similar resin chemistry and filler volume
Click here for table of packable composites
Packable Composites• Mechanical properties
– similar to hybrids
Choi J Esthet Dent 2000 Click here for abstract
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
ALERTSolitareSureFilHeliomolarZ100
Fracture Toughness
Proximal Contact Studies
• Packables similar to hybrids– diameter and tightness
• Best contacts– sectional matrix system
Peumans Dent Mater 2001 -click here for abstract Klein Am J Dent 2002
96.9 96.291.2
85.1
71.5 70.370.2
55.4
41.4
22.4
0 00
20
40
60
80
100
Pyr-D Prodigy SureFil Alert Solitaire Pyr-E
2 mm
5 mm
Depth of Cure
Packable Composite Resin
% Hardness Ratio
Choi J Esthet Dent 2000 Click here for abstract
Packable Vs. Hybrid Composites
• Mechanical properties similar
• Wear properties similar
• Curing depths similar
• Similar proximal contacts
• Drier, denser feel
Choi J Esthet Dent 2000Peumans Dent Mater 2001
Click here for more details
Flowable Composites
• Marketed – class 1, 3, 5– liner
• Particle size similar to hybrid composites
• Reduced filler content– reduces viscosity
01020304050607080
We
igh
t P
erce
nt
Percent Filler Loading
Aeliteflo
FloRestore
Revolution
Ultraseal+
Prodigy
Bayne JADA 1998 Click here for abstract
Liners Under Direct Composites
• Increased flow • Increased shrinkage• Improved marginal integrity?
– laboratory studies equivocal• most studies show no benefit
– Braga JADA 2003» click here for abstract
• Reduced post-operative sensitivity?– no clinical evidence of reduction
– Perdigao Quint Int 2004» click here for abstract
Polymerization Shrinkage
0
1
2
3
4
5
Aelite-
Flo
Revolu
tion
Wav
e
Flow-it
Tetric
Flo
wAle
rt
SureFil
Z100
Heliom
olar
%
Tolidis JDR 1999
Radiopacity
• Reduced radiopacity?– product specific– may be more
difficult to distinguish on radiograph
Murchison Quint Int 1999 Click here for abstract
0
50
100
150
200
250
Tetric Flow
Flow-it
Enamel
Revolution
FloRestore
UltraSeal+
Gray value
Flowable Composite
• Mechanical properties– inferior to hybrids
0 0.5 1 1.5 2 2.5MPa
Fracture Toughness
Prodigy
Ultraseal +
Revolution
FloRestore
Aeliteflo
0 50 100 150 200MPa
Flexure Strength
Bayne JADA 1998 Click here for abstract
Flowable Composites
• Clinical applications– preventive resin restorations– small Class 5– provisional repair– composite repair– liners??
Regular Material Usage*Civilian Practitioners
• Flowable Composite 81%• Hybrid Composite 69%• Amalgam 67%• All-Purpose Composite 53%• Microfill Composite 52%• Resin-modified Glass ionomer 45%• Packable Composite 33%• Compomer 7%• Other 1%
DPR 2005*Multiple responses
Review of Clinical Studies(Failure Rates in Posterior Permanent Teeth)
0
2
4
6
8
Amalgam DirectComp
CompInlays
CeramicInlays
CAD/CAMInlays
GoldInlays &Onlays
GI
Longitudinal Cross-Sectional
Hickel J Adhes Dent 2001
% Annual Failure
0
5
10
15
% Annual Failure
Manhart Oper Dent 2004 Click here for abstract
Standard Deviation
Longitudinal and Cross-Sectional Data
Review of Clinical Studies(Failure Rates in Posterior Permanent Teeth)
Purchasing ConsiderationsFederal Service
• Universal hybrid systems are suitable for both anterior and posterior restorations– may not need to stock packable systems
• additional expense to maintain• no improvement in mechanical properties• no improvement in proximal-contact formation• no increase in depth of cure
Click here for more details
Purchasing ConsiderationsFederal Service
• Most cases often only need one shade type• Complex cases may need multiple shades
applied in layers– larger Class 4, direct veneers, diastema
closures
• Wide diversity of kits available– simple kits with only a few shades– complete kits with multiple shades in various
opacities; bonding agents, dispenser guns, shade guides
Click here for synopsis of restorative composite resins
Purchasing ConsiderationsFederal Service
• Simple universal hybrid kit in compact case for routine individual use in operatories or suites– many systems available
• e.g., Prodigy (Kerr)
• More complete universal hybrid kitfor general use by entire facility or training program– several systems available
• e.g., 4 Seasons (Ivoclar Vivadent)
Click here for synopsis of restorative composite resins
Future Composites
• Low-shrinking monomers– expanding spiroorthocarbonates– epoxy-based resins– liquid crystal
• Self-adhesive?
Click here for details
Acknowledgments
• Dr. Dave Charlton
• Dr. Jack Ferracane
• Dr. Tom Hilton
Questions/CommentsCol Kraig Vandewalle
– DSN 792-7670