Nordic Espertise Magazine 2013 3MESPE NONO

8/17/2019 Nordic Espertise Magazine 2013 3MESPE NONO

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3 M E S P E N O R D I C D E N T A L C O N F E R E N C E I N S T O C K H O L M

magazine NORDIC EDITION 2013Espertise™

In the beginning of February 2013 3M ESPE held a Nordic scientific conference

in Stockholm. The focus was on adhesive dentistry covering three innovations

with the potential of making dentistry even less invasive and more adhesive. In

order to provide insight into this area of restorative dentistry, dental experts from

all Nordic countries were invited to a conference to share scientific findings,

details of product development and displaying expert opinions about chemical

composition and clinical use.


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29 opinion leaders, primarily from the Universities, from Sweden, Norway,

Finland, Iceland and Denmark participated in the conference.

The conference was led by chairman Dr. Odont. Torgils Laegreid, Norway. Lec-

tures were about adhesion:

“How to bond to every surface - the chemistry of an universal adhesive”

Dr. Christoph Thalacker, 3M ESPE

“Adhesion anno 2013 - Both for direct and indirect use” Prof. Bart van Meerbeek,

University of Leuven, Belgium

“Adhesive Composite Overlays on vital and devital teeth” Prof. Ivo Krejci, Univer-

sity of Geneva, Switzerland

Three short poster presentations by younger scientists from Nordic:

• “Longevity of posterior restorations and reasons for failure” – Simen Vidnes-

Kopperud, Norway

• “Brief notes on fracture load of Lava ™ Ultimate onlays and their adhesive

cementation with Scotchbond ™ Universal & RelyX ™ Ultimate combination” -

Lippo Lassila, Finland

• “Physical interaction of etch-and-rinse, self-etch, and self-adhesive cements

with root dentin: preliminary results” – Ana Raquel Benetti, Denmark

The products in scope from 3M ESPE were Scotchbond™ Universal Adhesive -

one bonding agent for all bonding purposes with one technique, and the corre-

sponding adhesive resin cement RelyX™ Ultimate Cement as well as Lava™

Ultimate CAD/CAM restorative, an indirect Resin Nano Ceramic material to be

cemented adhesively with the materials above.

There was an interactive discussion after each session. The participants found

the presented topics very interesting and contributed to fruitful exchange of

knowledge.

3M ESPE finds it important to have a good dialogue with opinion leaders. The

purpose of conferences like this is to bring 3M ESPEs researchers, international

scientists and local opinion leaders together for sharing different points of view on

relevant topics, as well as to establish and maintain a good relationship.

Nordic experts conference

in Stockholm February 6th 2013

1. Bonding to enamel - Selective

enamel etch. Micromechanical

retention through preceding selec-

tive enamel etch with phosphoric

acid & additional self-etch simulta-

neously on dentin using Scotchbond

Universal.

Enamel etch pattern of phosphoric

acid (5000x)

Bottom of adhesive layer (5000x)

2. Bonding to dentin - It is preferable to use mild but vigorous self etching with Scotchbond™ Universal. The collagen

inside the thin hybrid layer will remain hydroxyapatite rich and resistant against enzymatic MMP degradation.

3. High degree of conversion of Scotchbond Universal is reached after thorough evaporation of the solvent,

immediately followed by light curing.

Degree of Conversion of Scotchbond™ Universal

at the Dentin Interface

Adhesive Substrate Degree of conversion

Scotchbond ™

Universal Adhesive

Smear-layer

(self-etch)

85b±5%

Scotchbond ™

Universal Adhesive

Etched-dentin 83b±4%

Prime&Bond NT™ Etched-dentin 66a±13%

A high degree of conversion is beneficial to maint ain the integrit y of

the adhesive layer, increase strength, increase hydrophobicity and

reduce permeability.

Approximating a “One-Step Hydrophobic Overcoat”

Water placed on uncured

adhesive illustrates a

hydrophilic nature before

curing

Water placed on cured

adhesive illustrates ahydrophobic nature

after curing

Interfacial Analysis of Scotchbond™ Universal.

Self-Etch Mode on Dentin

Image Highlights:

Cured film thickness

approximately 5-10

microns

Hybrid layer approx.

1 micron

(composite)

DENTIN

ADHES IVE

HYBRID LAYER

Interfacial Analysis of Scotchbond™ Universal.

Total-Etch Mode on Dentin

Image Highlights:

Cured film thickness

approximately 5-10

microns

Hybrid layer 5 microns

Vitrebond™ Copolymer

forms a unique interfaceDENTIN

ADHES IVE

H Y B R

I D L A Y E R

Vitrebondcopolymer

Dr Bart Van Meerbeek, Catholic University of Leuven Dr Bart Van Meerbeek, Catholic University of Leuven

Espertise™magazine


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New adhesive chemistry and new techniques are hot

topics with many questions

Dental composites are bonded into the cavities via chemical bonding of the

dental adhesive to calcium hydroxyapatite and additionally micro-mechanical

interlocking of the cured adhesive is taking place.

Why selective enamel etching?It's useful to etch all bonding surfaces on enamel with phosphoric acid.

Retentive roughness on enamel is created with 15 sec. phosphoric acid etching

(pH < 1) followed by copious water rinsing. If "total etch" is used on dentin, the

collagen is exposed up to several micrometers deep, and the dentin tubuli are

opened during water rinsing. This can compromise the long term durability of

the dentin bonding and increase the occurrence of postoperative sensitivity.

Why 10-MDP and wet environment?The safest and most reliable treatment on dentin is the self-etching adhesive

with moderate acidity (pH = 2.7) like Scotchbond™ Universal. The treatment of

the bonding surface for 20 sec. is mandatory in penetrating and partly dissol-

ving the "smear layer" and still preserving the collagen intact and covered with

calcium hydroxyapatite.Chemical bonding to calcium hydroxyapatite both on enamel and dentin are

generated with functional monomers. The reactive acidic monomers in Scotch-

bond™ Universal are 10-MDP and Vitrebond™ copolymer. Acids require the

presence of water to be reactive and the bonding milieu on tooth structure is

hydrophilic.

Why Vitrebond™ copolymer?It increases robustness of the adhesive by optimizing bond strength especially

to the dentin also for extreme conditions (eg. overdried, etched dentin).

Why 10-MDP and dry environment?Bonding to artificial surfaces on dentition such as old composite, metals and

glass ceramics require hydrophobic conditions. Thus evaporation of water after

the previous bonding stage must be efficient and thorough. Air blowing into the

cavity must continue, until the surface of the adhesive layer does not move

anymore. The phosphate group of 10-MDP molecule in the adhesive can now

form strong chemical, covalent bonds to metal oxides like zirconia.

Why Silane and dry environment?The silane incorporated in the Scotchbond™ Universal adhesive mixture is

proven to function as efficiently as the separate silane RCP (RelyX™

CeramicPrimer) layered together with a conventional dental adhesive Adper Scotch-

bond™ 1 XT. The shear bond strength to hydrofluoric acid (HF) treated glass

ceramic surface was the same statistically for fresh and 24 month aged Scotch-

bond Universal as for fresh RelyX Ceramic Primer/Adper Scotchbond 1 XT. Only

cohesive failures in the glass ceramic were observed.

Nuclear Magnetic Resonance Spectroscopy

Comparison of two NMR active nuclei. Spectra of 1H NMR and 13C NMR are

showing that free silane species are present in fresh and aged Scotchbond

Universal and RelyX Ceramic Primer. Content of free silanes in Scotchbond Uni-

versal samples are at least on the same level as in RelyX Ceramic Primer.

This is recently shown in a study presented at the IADR 2013.

Abstract 631

C. Thalacker, A.S. Eckert, H. Loll, D.D. Kruger, R. Guggenberger, 3M ESPE

Dental Products, 3M Deutschland GmbH, 82229

Bonding Mechanism of a Universal Adhesive to Glass Ceramic.

Why the bonding surface must be first wet

and at the end very dry?While proper bonding to the tooth as a hydrophilic substrate requires a hydro-philic adhesive formulation, the cured adhesive must be hydrophobic for longe-

vity of the restoration to maintain its esthetics.

Scotchbond™ Universal achieves a switch from hydrophilic in the uncured state

to hydrophobic in the cured state by the following features:

• the water / ethanol based solvent system enables evaporation of excess

moisture during the air drying step

• the powerful photoinitiator system enables a degree of conversion of over

80% at the dentin interface and creates a very dense polymer network

• this can be shown by placing a drop of water on uncured and cured Scotch-

bond Universal (inhibition layer removed): significant increase in contact

angle for cured Scotchbond Universal

Why the combination of Scotchbond™ Universal and RelyX™ Ultimate cement is adual cure system?Dual cure activator for Scotchbond Universal adhesive is integrated into the

RelyX Ultimate adhesive cement.

The dark cure initator system of RelyX Ultimate is powerful enough to fully cure

the combination of Scotchbond Universal and RelyX Ultimate.


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3M, ESPE, Esper tise, Lava, Scotchbond, RelyX and Vitre-bond are trademarks of 3M Company or 3M DeutschlandGmbH.Used under license in Canada.

© 2013, 3M. All rights reserved.

Interview with Dr. Simen E. Vidnes-KopperudNordic opinion leader conference in Stockholm February 6th 2013

One of the younger participants, PhD Student Simen Vidnes-Kopperud from Oslo, made a poster

presentation during the event about “Longevity of posterior restorations and reasons for failure”.

After the event we asked him a few questions related to the conference:

1. Q: I understand this was the first time you joined an event like this. What is your opinion about this

kind of conference arranged by a company from the dental industry?

A: It is a good chance to learn more about an interesting field. Also, it is an opportunity to meet other

researchers within my field of research.

2. Q: The first speaker was one of 3M ESPEs own scientists. What do you think about using one of our

own researchers introducing to the audience 3M ESPEs new adhesive system Scotchbond™ Univer-

sal?

A: First of all, Dr. Thalacker was a very good speaker and presented complex information in an under-

standable manner. Combined with the more impartial lecture by Bart van Meerbeek, I found it unprob-

lematic that the developer presented 3M ESPE's newest product.

3. Q: What would you say in your opinion is more important? To stay with a well proven multi-step adhe-

sive system or change to a new, less technique sensitive one, based on a combination of well known

and new developed chemistry and with new properties?

A: Until long-term studies are available, I prefer staying with a well proven multi-step adhesive system.

But developments of new adhesive systems are very welcome and if we can achieve the same bond

strength with a less technique sensitive system, it will definitely enhance general dentistry.

4. Q: Professor Bart van Meerbeek was the next speaker, and you also heard him recently in Norway.

Which topic / topics in his presentation were more interesting for you?

A: It was interesting to see the difference in dentin bond between total-etch products and self-etch

products.

5. Q: Can you please explain why you find that more interesting?

A: 2-step etch&rinse-approach is quite common in Norway. It is interesting to see that a mild self-

etch-approach seems to have some better bond qualities.

6. Q: Before you heard Bart van Meerbeek in Norway in January, were you aware of that micromechani-

cal retention to etched tooth surface no longer is the only important retention for an adhesive to the

tooth?

A: Binding to HAp was new to me.

7. Q: What is your opinion about studies looking at the possibility of delaying or avoiding the debonding

prosess by treating the tooth surface with e. g. chlorhexidine or other medias?

A: As far as I have seen, this has not been successful yet.

8. Q: Exept for the lectures, did you have another outcome of this event?

A: I made some new contacts within my field of research.

Dr. Simen E. Vidnes-Kopperud


Hvamveien 62013 Skjetten, NorwayTelefon: +47 06384E-mail: www.3MESPE.no/kontaktInternet: www.3MESPE.no

Nordic Espertise Magazine 2013 3MESPE NONO

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