Day 1 Lecture 1 Flashcards by Tyler Brown

Operative Dentistry

The science and art in Dentistry that studies the prevention, diagnosis and treatment of defects/disease in the enamel and dentin.

How well did you know this?

Not at all

Perfectly

Carious

Bacterial infection, removal of tissue, precise cavity prep.

How well did you know this?

Not at all

Perfectly

Non-carious

Loss due to chemical or mechanical abrasion. Attrition, abrasion, erosion, abfraction

How well did you know this?

Not at all

Perfectly

Attrition

Breakdown from pressure

How well did you know this?

Not at all

Perfectly

Abfraction

Angular notch caused by bending of tooth

How well did you know this?

Not at all

Perfectly

Direct Restoration

Soft material placed then hardened.

How well did you know this?

Not at all

Perfectly

Indirect Restoration

Formed outside body then cemented or bonded to tooth

How well did you know this?

Not at all

Perfectly

Airdriven vs. Electric

Volume, higher power, less stalling

How well did you know this?

Not at all

Perfectly

Slow speed

12000 RPM, no water coolant, close to pulp removal, surface polishing and finishing.

How well did you know this?

Not at all

Perfectly

Medium Speed

12-20 thousand

How well did you know this?

Not at all

Perfectly

High Speed

> 200000, needs water coolant, most cutting.

How well did you know this?

Not at all

Perfectly

Most common connector line

4 hole

How well did you know this?

Not at all

Perfectly

Slight angle

Contrangled

How well did you know this?

Not at all

Perfectly

Base of hand piece

coupler

How well did you know this?

Not at all

Perfectly

Push button

One chuck mechanism

How well did you know this?

Not at all

Perfectly

Nose cone

Straight attachment, slow speed, extraoral work, long shank type bur, straight bur.

How well did you know this?

Not at all

Perfectly

2 latch type head

Swing latch

How well did you know this?

Not at all

Perfectly

Friction Grip head

Slow speed, push/screw

How well did you know this?

Not at all

Perfectly

Rotary Cutting Instruments 3 components

Head neck shank

How well did you know this?

Not at all

Perfectly

3 types of rotary instruments

Bladed, Diamond (abrasive), Other (?)

How well did you know this?

Not at all

Perfectly

Tapered neck - why

Visibility

How well did you know this?

Not at all

Perfectly

Bladed instruments

Excavating, Finishing

How well did you know this?

Not at all

Perfectly

Finishing burs

10-30 blades - 10-12 red, 16-20 yellow, 30 white

How well did you know this?

Not at all

Perfectly

Excavating/cutting burs

6-8 blades

How well did you know this?

Not at all

Perfectly

Blade cutting composition/use

Tungsten carbide, intracoronal prep

Diamond for abrasive cutting

metal blank with diamond for extracoronal preps.

Diamond colors

Supercoarse to superfine: black, green, blue, red, yellow

Other (type of rotary instrument)

Discs (attached via handpiece via mandrel for finishing restorations), Molded (grinding etc.)

Round (Blade design)

1/4 -4 (0.5 mm to 1.4 mm)

Inverted Cone (blade design)

331/2-40

Pear shaped (blade design)

330 (1.5 mm, diam = 0.8mm, taper = 8deg), 245 (length - 3mm, taper = 4deg, diam = 0.8mm)

Plain Cylindrical Fissure

55-59 (200 series for rounding corners)

Plain Tapered Fissure

169-172

Head design - end cutting

End only has blades - 900s

Cross cut

500 before bur number, also 700

Fracture types

Brittle, ductile

Brittle fracture

*ABRASIVE CUTTING IS BEST for extracoronal preps - diamond bur* Tensile loading causes cracks in enamel, helps break

Ductile Fracture

Deformation by shearing - dentin *Bladed cutting is best (deform then shear) - best for intracoronal preps*

Rake face

Blade surface toward cutting, forms chip

Clearance face

Surface that clears the chips- away from cutting direction

Rake angle

Rake to axis of bur

Edge angle

Rake face to clearance face

Clearance angle

Clearance face to tangent (cutting edge to tooth surface) - prevents blade from rubbing on tooth surface, bigger clearance angle = less friction = longer bur life

Positive vs negative rake angle

More efficiency and less durable. Higher cutting efficiency, more chips made, less chip space (clogging)

Patient hazard of cutting instruments

Heat and vibration can lead to pulpal trauma (water coolant helps this)

Hand instrument components

Handle, shank, working end (nib/point for non cutting, blade for cutting)

Non-cutting

Examination instruments (mirror, explorer, perio probe)

Hand-cutting

shape walls for finer detail - blade is carbon steel, handle is stainless steel

Restorative instruments (noncut)

place material and carve material - carrier, condenser/plugger, anatomical/acorn burnisher

accessory instruments

aid procedure- miller forceps (paper holder), amalgam well

Mirror

left hand, retraction of tissue and protection.

Explorer

Pointed tip (enhanced tactile) for caries detection

Perio probe

depth

Blade edges

Primary/2 secondary cutting edges

Blade edge types

Straight, mono angled, bin angle, triple angle

Balance

Blade tip in line with center of tool

Black's Instrument Formula

1st: width of blade in 1/10mm, 2nd: blade length in mm, 3rd: Angulation w/respect to long axis (100ths, lower than 50)

4 number formula

1st, 2nd to 3rd, 3rd to 4th, new 2nd: primary cutting edge angle (100ths greater than 50)

Single bevel

right triangle

Bibevel

isosceles triangle

Triple bevel

Rec/bibeveled on 3 sides

Direct cutting

Perpendicular force, hatchet used

Indirect cutting/lateral cutting

Parallel force

Chisels

Straight, slightly curved, bin angled hatchets, enamel hatchet, gingival margin trimmer

Enamel hatchet

lateral cutting and direct cutting

Gingival margin trimmer

lateral cutting, curved blade to facilitate this

Excavator

Ordinary hatchet, hoes (pull), angle former, spoon