By

Dr. RASHID HASSAN

BDS(de’ Mont) MSc (QMUL.UK)

Hod Science of Dental Materials

Overview \

2

USES:

Class III & V cavities.

Luting agent.

Orthodontic bracket adhesives.

Pit and fissure sealants.

Liners and bases.

Core buildups.

3

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.

4

5

100000 NANOMETERS 25 ,400 ,000 NANOMETERS 6

Nano Technology

7

8

NANO TECHNOLOGY

(SIMPLEST EXAMPLE)

9

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”

10

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.

12

Smaller scale = Smaller defects

SCANNING TUNNELING

MICROSCOPE

ATOMIC FPRCE

MICROSCOPE

13

MICROSCOPIC ANALYSIS OF

NANO MATERIALS

1 4

Tests Performed

15

MECHANICAL PROPERTIES

16

* 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

17

Atomic Force Microscopy

(AFM)

International parameter

for measuring surface

roughness.

Range from angstroms to

100 microns.

NANO IONOMERS TOPOGRAPHIC

ANALYSIS

NANO IONOMERS TOPOGRAPHIC ANALYSIS

19

MICROSCOPIC ANALYSIS

20

NANO IONOMERS

INDICATIONS

Primary teeth restorations.

Small Class I, Class III and V.

Temporary restorations.

Filling defects and undercuts,

“Sandwich” technique.

Core build-ups.

21

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).

22

NANO IONOMERS

.

23

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

FOR VIDEO LECTURES ON DENTAL MATERIALS

VISIT dmbydrrashid on Facebook