Armamentarium required for finishing and polishing of acrylic denture.

1. Dr. Mamunur Rashid
Department of Prosthodontics
Sapporo Dental College & Hospital
ID:07041

2. 1. To obtain the desired anatomy and proper
occlusion.
2. Reduction of roughness and scratches.
3. To obtain smooth surface which resist bacterial
adhesion & excessive plaque accumulation by
this way it maintain oral health.
4. Esthetics: finishing and polishing gives luster to
visible surface of restoration and increase
optical property of restoration.

3.  Contouring: Process of producing desired
anatomic form by cutting away excess material.
 Cutting: Process of removing the material from
substrate by the use of a bladed bur or an
abrasive embedded in a binding matrix on a
bur or disc.
 Finishing: process of removing surface defect
or scratches by the use of cutting or grinding
instrument or both.
 Polishing: The most refined of the finishing
process ,removes the finest surface particle.

4. Bulk reduction
• Removal of excess material
• Instruments – sand stone, carbide and steel
burs, abrasive coated disks, or separating
disks.
• 8 - 12 fluted carbide burs or abrasives with
particle size of 100µm or larger

5. • Achieved during bulk reduction
• Finer instruments may be used
• Desired anatomy and margins must be
achieved.
• 12 - 16 fluted carbide burs or 30 - 100 µm sized
abrasive particles used

6. • Introducing finer scratches to surface of
substrate
• Provides a blemish free smooth surface.
• 18 - 30 flute carbide burs , fine and super fine
diamond burs, or abrasives between 8 and 20
µm in size.

7. • Provides enamel like luster.
• Smaller particles provide smoother and shinier
surfaces
• Abrasives of 20 µm provide luster
• Importance of polishing:
• Less bacterial colonization
• Comfortable for the patient

8.  Cutting instrument:
 Tungsten Carbide Burs.
 Lathe motors.
 Micro-motor Trimmer(Acrylic Trimmer)
 Bonded Abrasives:
i. Silicon Carbide
ii. White stone
iii. Tripoli
iv. Rouge
v. Diamond
 Impregnated Abrasives.
i. Aluminum oxide.
ii. Emery.
iii. Quartz.
iv. Silicon carbide.
v. Garnet
vi. Zirconium Silicate.

9.  Loose Abrasives:
i. Aluminum oxide .
ii. Tin oxide.
iii. Pumice
According to source:
 Natural abrasives
i. Chalk.
ii. Diamond.
iii. Emery.
iv. Garnet.
v. Pumice
vi. Quartz.
vii. Sand .
viii. Tripoli.

10. • Diamond - 7500 KHN
• Silicon carbide - 2500 KHN
• Aluminum oxide - 2100 KHN
• Emery - 2000 KHN
• Corundum - 2000 KHN
• Tungsten carbide - 1900 KHN
• Garnet - 1350 KHN
• Quartz - 800 KHN
• Sand - 560 KHN
• Pumice - 560 KHN
• Chalk - 135 KHN

11.  Use:when fix with a Micromotor trimmer,it is
use for:-
a. To remove the excess material from Denture to create a
smooth surface.
b. Give desired anatomic form by cutting away excess
material.
c. Remove surface defect and scratches.
--------------------- Shank ----------------<--------Neck ------<- Head>

12. The cutting property of a bur
varies with the positioning and
the degree of angling of the
blades. More obtuse angles will
produce a negative rake angle,
which increases the strength
and longevity of the bur. More
acute angles will produce a
positive rake angle, which offers
a sharper blade for quicker
cutting but which dulls sooner.
Additional cuts across the
blades, called“crosscuts,” can be
added to increase cutting
efficiency

13. Foot Control
Cradle
Control
Hand piece
Uses: Used to finish and
polish acrylic denture by
adding different bur and
Sand paper
How to operate:
Connect the motor cord and foot
pedal cord to control unit.
After confirm the permission power
the control unit ,plug the power cord
into an electric outlet.
Set the speed control knob to the
lowest position.
Turn the power of the control unit.
To increse the micromotor speed
turn the speed control knob clockwise.
It can either control by pedal or
control switch.

14.  It ensures vibration free rotation even at the
maximum speed of 35000 RPM( Rotation per
minute)
 High torque at all speed.
 Can be operated by both hand and foot control,
Reverse and forward rotation by hand switch,
on/off foot switch.
 Mounting & Removing a bur:
After turn the set ring of the hand piece clockwise to open the
collet chuck, extract a old bur.
After insert perfectly a new bur until reach in the back of the
collet chuck, turn the set ring counter-clockwise to lock the
collet chuck.

15. Uses:
Apply polishing
compound on a buff or
rag wheel and polish the
dentures to a high gloss.
By adding different
polishing buff it is able to
produce a luster and
shiny surface.

16. Extremely hard abrasive and 1st synthetic
abrasive.
Highly effective cutting of acrylic resin materials.
Abrasive in coated disks and as vitreous - bonded
and rubber instruments.

17. •Mineral forms of calcite.
•White abrasive composed of
calcium carbonate.
•Used as a mild abrasive paste
to to polish Acrylic resin.

18. • Natural form of an oxide of
aluminum
• Grayish- black corundum
Coated abrasive disks
• Greater the content of alumina
- finer the grade of emery.
• Finishing of metal alloys or
acrylic resin materials.

19. • Highly siliceous material of volcanic
origin
• Powder-crushing pumice stone
• Pumice should be loaded on a lathe
mounted rag wheel
• Pumice powder mix with water is
coated over the rag wheel.
• The finished denture should be
polished by intermittently pressing
against the rotating rag wheel

20. • Predominantly composed of silica.
• Particles represent a mixture of color.
• Rounded to angular shape.
• Applied under air pressure to remove
refractory investment materials
• Coated on to paper disks

22.  Textbook of Denture Prosthodontics .
 http://www.airforcemedicine.af.mil/shared/media/docu
ment/AFD-130329-077.pdf
 http://handlermfg.com/products/index.php?main_page=i
ndex&cPath=34_49
 http://www.usdentaldepot.com/Dental-
supplies/MARATHON-3-CHAMPION-MICROMOTOR-
40000RPM-%28-%29P101536
 h t t p : / / d e n t a l h a n d p i e c e s r e p a i r s . c o m /
 Historyofdentalhandpieces.aspx. Accessed December
1,2008.
 3 Poole RL, Lea SC, Dyson JE, Shortall AC, Walmsley
AD.Vibration characteristics of dental high-speed turbines
andspeed-increasing handpieces. J Dent. 2008 Jul;36(7):488