The document discusses applications of nanotechnology in dentistry. It begins by defining nanotechnology and noting its introduction in 1959. It then outlines five key applications: 1) Nanocomposites which can improve dental fillings, 2) Orthodontics where coatings can reduce friction, 3) Treating hypersensitivity using gold nanoparticles, 4) Advanced digital imaging techniques, 5) New methods for local anesthesia administration using nanoparticles. The document concludes by citing references for further information on nanotechnology's potential in the dental field.

1. NANOTECHNOLOGY
IN DENTISTRY
Done by
Ahmed Awadalla, Karim Mohamed Fayez, Mohamed Ahmed Shaaban,
Mohamed Mahfouz ,Sherif Hatem Mohamed
Semester Four
Under supervision of : A.Prof Samah Kamel

2. INTRODUCTION TO NANOTECHNOLOGY:-
• The term nanotechnology was first introduced by Richard Feynman in 1959
• Nanotechnology deals with the physical, chemical, and biological properties of
structures and their components at nanoscale dimensions

3. NANOTECHNOLOGY IN DENTISTRY
(NANODENTISTRY)
• The development of Nano-dentistry will allow nearly perfect oral health by the use of
nanomaterials and biotechnologies (including tissue engineering and nanorobots)
• Applications of Nanotechnology in Dentistry
• 1-Nanocomposites
• 2-Nanotechnology in Orthodontics
• 3-Hypersenstivity Cure
• 4-Digital dental imaging
• 5-Nanotechnology in Oral and Maxillofacial Surgery

4. 1-NANOCOMPOSITES
Dental resin nanocomposites are comprised of a mixture of the resin matrix,
nanofillers, photo-initiator, etc., to be filled into the cavity
-Nanofillers that are used in the dental composites are:-
A- Silica nanoparticles
B- Modified silica nanoparticles
C- Mesoporous silica nanoparticles
D-Nanocluster fillers (Zirconia-silica nanoparticles)

5. NANOCOMPOSITES
• Silica nanocomposites: These composites with silica nanoparticles. They were
developed to address the polishing requirements of the teeth surfaces.-Some
cariogenic bacteria that lives inside the oral cavity causes damage of the tooth
enamel thus silica nanoparticles polishing play a role in preventing dental caries.
• Modified silica nanoparticles: are used to treat dental hypersensitivity as they are
developed for the occlusion of dentinal tubules.
• Mesoporous silica: It is the most widely researched the last years.-possesses well-
defined structures, high surface areas, and high thermal stability.

6. NANOCOMPOSITES
Zirconia-silica nanoparticles
Synthesized from a colloidal solution of a
zirconia salt and silica. Advantages to
resin composite:-
a-Reduces the polymerization shrinkage
b-Improve physical properties and the
mechanical performance

7. 2-NANOTECHNOLOGY IN ORTHODONTICS
• Frictional force during sliding tooth along an arch
wire causes root resorption and loss of anchorage
• -Coating the orthodontic wire with inactive
fullerene-like tungsten disulfide nanoparticles
cause reduction in friction as it provides excellent
dry lubrication properties.
• -In future, these nanorobots could directly
manipulate periodontal tissues thus allowing a
rapid, painless tooth straightening, rotating,
vertical repositioning within minutes to hours.

8. 3-HYPERSENSTIVITY CURE
• Dentin hypersensitivity is pathologic phenomenon
that causes movement of fluid within the dentin
tubules
• A permanent solution could be done using gold
nanoparticles ( 5 nm in diameter) to occlude the
selected sub-micron sized dentinal tubules.
• sintering of highly concentrated gold
nanoparticles brushed into the exposed open ends
of dentinal tubules.
• Laser irradiation also induced the photo fusion of
gold nanoparticles via photothermal conversion.

9. 4-DIGITAL DENTAL IMAGING
• Advances in digital dental imaging techniques are also expected with
nanotechnology -In digital radiographies obtained by nanophosphor scintillators, the
radiation is reduced and high-quality images are obtained.

10. 5-NANOTECHNOLOGY IN ORAL AND
MAXILLOFACIAL SURGERY
• In Local anesthesia:
• -Painless methods of administration of
local anesthesia may be achievable by the
application of nanotechnology.
• -Colloidal suspension containing millions of
active analgesic nanoparticles will be
instilled on the patient’s gingiva.
• -They reach the pulp via the gingival
sulcus and dentinal tubules-Once reached
the pulp, these particles may shut down all
sensitivity in any particular tooth which
provide comfort to the patient.

11. REFERENCES
• 1- https://www.longdom.org/open-access/nanotechnology-in-dentistry-what-does-the-
future-hold-in-store-2161-1122.1000198.pdf (2014)
• 2- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3571524/ (2013 Jan)
• 3- https://www.journal-imab-bg.org/issues-2016/issue1/JofIMAB_2016-22-1p1050-
1055.pdf (2016, vol. 22, issue 1)
• 4- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5854556/
(Published online 2017 Dec 7)
• 5-
https://www.researchgate.net/publication/284167887_Nanodentistry_The_next_big_t
hing_is_small (2014 Dec)

12. QUESTIONS ?

13. THANKS FOR YOUR
LISTENING