Nano Ionomers by Dr Rashid Hassan

By

Dr. RASHID HASSAN

BDS(de’ Mont) MSc (QMUL.UK)

Hod Science of Dental Materials

Overview \

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USES:

Class III & V cavities.

Luting agent.

Orthodontic bracket adhesives.

Pit and fissure sealants.

Liners and bases.

Core buildups.

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GLASS IONOMER CEMENT

GLASS IONOMER CEMENT

Unique features

Biological adhesion with Enamel & Dentin.

Fluoride releasing ability.

Disadvantages

Low fracture toughness.

Low flexural strength.

Low wear resistance.

Relatively poor esthetics.

Surface roughness.

Poor polishability.

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100000 NANOMETERS 25 ,400 ,000 NANOMETERS 6

Nano Technology

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NANO TECHNOLOGY

(SIMPLEST EXAMPLE)

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NANO TECHNOLOGY

(SIMPLEST EXAMPLE)

In 1959 Faynman postulated that

”we can someday

manipulate material at an atomic

scale, as there is always room at the

bottom”

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NANO TECHNOLOGY

1 1

POWER

OF

NANO

SCALE

NANOTECHNOLOGY

Defects Defects are known to exist in

materials.

Inglis in 1912 showed how stress

changes around a defect.

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Smaller scale = Smaller defects

SCANNING TUNNELING

MICROSCOPE

ATOMIC FPRCE

MICROSCOPE

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MICROSCOPIC ANALYSIS OF

NANO MATERIALS

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Tests Performed

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MECHANICAL PROPERTIES

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* Tancan Uysal etal ,2010, Oxford Journals,

Medicine,European Journal of Orthodontics.Volume

32, Issue 1,Pp. 78-82

Richard Van Noort, Introduction to Dental Materials, 2007.3rd Edition, Elsevier, P 142.

Range of

GIC

Shear Bond

Strength

(Mpa)

Compressive

Strength

(Mpa)

Tensile

Strength

(Mpa)

Nano

ionomers *

8.26 265 58

Conventional

GIC

4.3 202 16

THREE BODY WEAR TEST

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Atomic Force Microscopy

(AFM)

International parameter

for measuring surface

roughness.

Range from angstroms to

100 microns.

NANO IONOMERS TOPOGRAPHIC

ANALYSIS

NANO IONOMERS TOPOGRAPHIC ANALYSIS

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MICROSCOPIC ANALYSIS

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NANO IONOMERS

INDICATIONS

Primary teeth restorations.

Small Class I, Class III and V.

Temporary restorations.

Filling defects and undercuts,

“Sandwich” technique.

Core build-ups.

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STORAGE & USE

1. Shelf life at room temperature is 24 months.

2.Recommended storage 2-27 C (36-80 F)

3.The Ketac N100 system is to be used at room

temperature of approximately 21-24°C(70-75°F).

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NANO IONOMERS

.

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Future work

Investigating other mechanical

properties

Relevance With oral environment

Fluoride Recharge

Biochemical Stability

Dr. RASHID HASSAN

BDS(de’ Mont) MSc (QMUL.UK)

Hod Science of Dental Materials

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