What’s New & What’s Not in Adhesive Restorative Materials · 10/18/2017 · What’s New &...
Transcript of What’s New & What’s Not in Adhesive Restorative Materials · 10/18/2017 · What’s New &...
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What’s New & What’s Not in Adhesive Restorative
MaterialsEdmond R. Hewlett, D.D.S.
October 18, 2017
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Disclaimer No financial interest in any products discussed.
No contractual or non-contractual agreements with any manufacturers or corporations.
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Resin-Enamel Bonding
Image: Peumans, et al. J Dent 2000
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Resin-Enamel Bonding
Image: Peumans, et al. J Dent 2000
Hybridized Zone
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Resin-Enamel Bonding
Phosphoric acid (H3PO4), 32%-35%: IDEAL
↑↑ surface area
CLEANS• Debris, contaminants
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Resin-Enamel Bonding >60 years of clinical experience with
phosphoric acid etching
Predictable and Durable!
As good as it gets
Image: Peumans, et al. J Dent 2000
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Selective Etching…
..for Self-Etching systems• minimal etch of enamel – adequate?• PRE-ETCH enamel w/phosph. acid for best seal
Dr Mario de Goes
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Resin-Enamel Bonding
Image: Peumans, et al. J Dent 2000
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Resin-Dentin Bonding
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Resin-Dentin Bonding Product choices
• 3-step etch/rinse • 2-step etch/rinse• Self-etching• solvent type?• monomer type?• filler?• mixing?
Technique choices• etch time?• wet, moist, or dry? • disinfectant?• desensitizer?• application time?• apply once? twice?...• drying technique?• curing technique• flowable liner?
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Resin-Dentin BondingProduct choices
3-step etch/rinse 2-step etch/rinseSelf-etchingsolvent type?monomer type?filler?mixing?
Technique choicesetch time?wet, moist, or dry? application time?apply once? twice?...drying technique?curing techniqueflowable liner?
Substrate variables deep or shallow? caries affected? sclerotic? tubule density? fluid/pulpal pressure? pulpal proximity etch depth? un-hybridized collagen? smear layer components? contamination?
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Resin-Dentin BondingProduct choices
3-step etch/rinse 2-step etch/rinseSelf-etchingsolvent type?monomer type?filler?mixing?
Technique choicesetch time?wet, moist, or dry? application time?apply once? twice?...drying technique?curing techniqueflowable liner?
Substrate variablesdeep or shallow?caries affected? sclerotic?tubule density?fluid/pulpal pressure?pulpal proximityetch depth?un-hybridized collagen?smear layer components?contamination?
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Resin-Dentin Bonding –a pathway to predictability?
Product choices3-step etch/rinse 2-step etch/rinseSelf-etchingsolvent type?monomer type?filler?mixing?
Technique choicesetch time?wet, moist, or dry? application time?apply once? twice?...drying technique?curing techniqueflowable liner?
Substrate variablesdeep or shallow?caries affected? sclerotic?tubule density?fluid/pulpal pressure?pulpal proximityetch depth?un-hybridized collagen?smear layer components?contamination?
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Dentin as a Bonding Substrate
No such thing as “NORMAL dentin” Substrate variability = Bonding
variability Don’t be complacent!
- Summary:
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What Do The Experts Say?
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Product Classification
(Adapted from Tay, et al., J Appl Oral Sci 2004)
No Mix
(3-Step Etch & Rinse)
(2-Step Etch & Rinse)
(2-Step Self-Etch)
(1-Step Self-Etch, Mix)
(1-Step Self-Etch, No Mix)
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3-Step Etch & Rinse Systems
1. Etch 2. Primer 3. Adhesive Resin
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Product Classification
(Adapted from Tay, et al., J Appl Oral Sci 2004)
No Mix
(3-Step Etch & Rinse)
(2-Step Etch & Rinse)
(2-Step Self-Etch)
(1-Step Self-Etch, Mix)
(1-Step Self-Etch, No Mix)
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Two-Step Self-Etching Systems
1. Etch/Primer 2. Adhesive Resin
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Durability of the resin-dentin bond
“The most compelling problem associated with resin-dentin bonds is their limited durability…”
- Tay & Pashley, J Dent Res 2009
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Durability of the resin-dentin bond•Dentin bonds made w/ hydrophilic contemporary adhesives
deteriorate over time:
•Hydrolysis of hydrophilic resin components via water sorption
•Hydrolysis of unpolymerized resin by host enzymes from saliva
•Degradation of exposed demineralized collagen fibrils by host enzymes from dentin and saliva
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Nanoleakage
(Perdigao, J.)
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(cut dentin surface)
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(cut dentin surface)
After etching:
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(cut dentin surface)
After etching:
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(cut dentin surface)
After etching:
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After etching:
(cut dentin surface)
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EXPOSED demineralizedcollagen fibers
Over-etchedUnder-primed
Susceptible to enzymes(MMPs)
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Sequential Etching…
… for Etch & Rinse products Enamel: etch for ∼ 30-45 sec. Dentin: etch for ∼ 10 sec.
Dr Mario de Goes
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Preventing Dentin Bond Degradation
Degradation of demineralized collagen matrix over time by enzymes (MMPs) Pashley, Tay, et al.-JDentRes 2004
Chlorhexidine may inhibit MMPs after etching 2% for 30 sec. Blot dry
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“Phosphoric-acid etching of dentin
could nowadays be considered too
aggressive for dentin, given all the
consequences related to exposure of
the vulnerable collagen.”- Van Meerbeek, et al., 2011
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“Universal” Adhesive Systems –The End of “Generations”?
Updated chemistry Resin monomers Less water, more alcohol
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Dentin: Moist or Dry? Indirect w/ Self- or Dual-Cure
ScotchbondUniversal (3M ESPE)
Either is OKMix w/DCA, Apply, Dry, & Cure
All-Bond Universal (Bisco)
Moist, Do Not Dessicate for TE AND SE
Apply, Dry, & Cure
Prime & Bond Elect (Caulk)
TE: Moist, Do Not DessicateSE: Dry
Mix w/SCAApply, Dry, & Cure
G-Premio Bond (GC) “rinse…and gently dry” Apply, Dry, & Cure
OptiBond Universal (Kerr)
Air dry, Do not Dessicate Apply Twice, Dry, & Cure
Clearfil Universal Bond/Universal Bond Quick (Kuraray)
“dry with air or with cotton pellets”
Mix w/DCA, Apply, Dry, & Cure
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Dentin: Moist or Dry? Indirect w/ Self- or Dual-Cure
ScotchbondUniversal (3M ESPE)
Either is OKMix w/DCA, Apply, Dry, & Cure
All-Bond Universal (Bisco)
Moist, Do Not Dessicate for TE AND SE
Apply, Dry, & Cure
Prime & Bond Elect (Caulk)
TE: Moist, Do Not DessicateSE: Dry
Mix w/SCAApply, Dry, & Cure
G-Premio Bond (GC) “rinse…and gently dry” Apply, Dry, & Cure
OptiBond Universal (Kerr)
Air dry, Do not Dessicate Apply Twice, Dry, & Cure
Clearfil Universal Bond/Universal Bond Quick (Kuraray)
“dry with air or with cotton pellets”
Mix w/DCA, Apply, Dry, & Cure
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Vital Pulp Therapy
Cao, et al. J Calif Dent Assn 2016
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Vital Pulp Therapy
aka:
Direct pulp capping
Pulpotomy
Cao, et al. J Calif Dent Assn 2016
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Vital Pulp Therapy
Primary goal:
Preserve healthy pulp tissue to encourage pulpal repair by hard tissue bridge formation
Cao, et al. J Calif Dent Assn 2016
- Ricucci D, et al. J Dent 2014
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Vital Pulp Therapy
Critical Factors:
Hemorrhage control Sodium hypochlorite 5.25% ↓ bleeding AND disinfects
Seal out bacteria Bonded/sealed definitive restoration
Cao, et al. J Calif Dent Assn 2016
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Vital Pulp Therapy
ZOE? Resin bonding? Gl ionomer?
Calcium hydroxide? MTA? CSCs?
Formation of a hard tissue bridge - What material?
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Vital Pulp Therapy
ZOE? High leakage, but eugenol kills bacteria (-/+) Eugenol is cytotoxic (-) Eugenol release drops quickly with time (-)
Resin bonding? Cytotoxic (-) Poor outcomes in human studies (-) Seal? (+/-)
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Vital Pulp Therapy
Calcium hydroxide? Excellent antibacterial (+) Long track record (+) Bioactive molecule release (+)
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Vital Pulp Therapy
Calcium hydroxide? Inconsistent outcomes Success rate ↓ as time ↑ “Tunnel defects” in dentin bridge Allowes bacteria ingress
“CH…can no longer be considered the material of choice for VPT.”
- Cao, et al. J Calif Dent Assn 2016
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Vital Pulp Therapy with Calcium Silicate Cements (CSCs)
Mineral Trioxide Aggregate (MTA) First developed as a sx. root repair
mat
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Vital Pulp Therapy with CSCs
MTA (Mineral Trioxide Aggregate) Excellent biocompatibility and sealing ability (+) Prolonged alkaline pH Radiopaque (+) High solubility (-)
Poor handling properties (-) Prolonged setting time (-)
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Vital Pulp Therapy with CSCs
MTA (Mineral Trioxide Aggregate)
Success rate > calcium hydroxide Mineral infiltration zone at dentin interface Long-lasting seal Better dentin bridge density
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Cao, et al. J Calif Dent Assn 2016
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Vital Pulp Therapy with CSCs
Biodentine™ Chemically similar to MTA Sets in 10-12 min. (vs. 3-4 hrs.) “Mineral infiltration zone” at interface Interim restoration – lasts up to 6 months
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Vital Pulp Therapy with CSCs
TheraCal LC™ Light-cured, resin-modified calcium silicate liner
Calcium release stimulates hydroxyapatite and secondary dentin bridge formation
Alkaline pH promotes healing
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Vital Pulp Therapy with CSCs
TheraCal LC™ Light-cured, resin-modified calcium silicate liner
Per msds: Portland Cement Type III <60% Polyethlene glycol dimethacrylate <50% Barium zirconate <10%
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Neo MTA (NuSmile) MTA Flow (Ultradent)
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ACTIVA BioACTIVE (Pulpdent)
Bioactive glass filler Ion-releasing Allows diffusion of Ca2+, PO4-, & F-
Rubberized resin Elastic modulus similar to dentin Less interfacial stress
Better SEAL
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ACTIVA BioACTIVE (Pulpdent)
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“3. Etch prepared tooth surfaces for 10 seconds…with…phosphoric acid etching gel…”
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“3. Etch prepared tooth surfaces for 10 seconds…with…phosphoric acid etching gel…”
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“D3120 pulp cap – indirect (excluding final restoration)”
“Procedure in which the nearly exposed pulp is
covered with a protective dressing to protect the
pulp from additional injury and to promote
healing and repair via formation of secondary
dentin. This code is not to be used for bases
and liners when all caries has been removed.”
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Restoration Longevity
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Restoration Longevity 70 y.o. female
Restoration age?
How?
Why?
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Restoration Longevity 65 y.o. female
∼ 50 y.o. amalgam!
How?
Why?
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Restoration Longevity 65 y.o. female
∼ 50 y.o. amalgam!
How?
Why?
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30 Years
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Restoration Longevity Factors Healthy diet Meticulous OH Good quality/quantity
of saliva Petite Light biting force Anterior guidanceFRIENDLY, LOW RISK
ENVIRONMENT
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Restoration Longevity Factors Healthy diet Meticulous OH Good quality/quantity of
saliva Petite Light biting force Anterior guidance FRIENDLY
ENVIRONMENT
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THANKS!Edmond R. Hewlett, D.D.S.
October 18, 2017