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Operative > Operative lecture 1 > Flashcards

Operative lecture 1 Flashcards

1
Q

Enamel, Dentin, Pulp characteristics

A

Enamel: Very brittle
Dentin: more ductile, deforms before it breaks after pressure.
Pulp: Connective tissue

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2
Q

Carious vs. Non carious

A

Carious: Bacterial infection, diseased tissue has to be removed, precise cavity prep needed.

Non-carious: loss of surface tooth structure due to mechanical or chemical factors..
Example: Attrition, abrasion, erosion, abfraction –> all chemical loss of tooth surface.

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3
Q

Direct restoration (give example) vs. Indirect restoration

A

Direct: Dental material placed in soft state directly in cavity prep to restore contour before it sets hard. (algams, composite)

Indirect: Restoration fabricated outside oral cavity and then cemented or bonded to the tooth.

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4
Q

2-medium speed?

3-high speed?

  1. Slow speed?
A

12,000-20,000rpm

> 200,000 rpm (removes older restorations, cavity prep)

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5
Q

most common connector line?

A

4 hole

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6
Q

High speed handpiece

A

fixed coupler, and head

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7
Q

Slow speed handpiece

A

Contra angled attachment –> intra oral procedures

Straight attachment –> always used for extra oral proecdures (smooth crown finish/polish)

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8
Q

3- friction grip head

A

uses friction grip type bur (shorter shanks than latch type)

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9
Q

2-latch type head

A

accepts only latch end burs

latch end burs are larger in diameter than the friction grip burs

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10
Q

What direction to attach bur on bur tool type/bur changing wrench?

A

Clockwise to attach bur

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11
Q

Rotary cutting instruments:

head

A

stainless steal

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12
Q

Rotary cutting instruments:

Shank

A

straight/long
slow speed contragled latch type
friction grip design
Larger diameter

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13
Q

Rotary instruments–Bladed instruments (burs)

A
  1. excavating

2. finishing

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14
Q

1-carbride for blade cutting (bladed instruments)

A
  • blades..tungsten carbrdie blanks ground to the desired shape. Harder/stronger than stainless steal but BRITTLE
  • Uses: Intracoronal prep (going through enamel/dent shovel into tooth
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15
Q

Other abrasives (Non cutting-Not diamond)

Coated

A

discs attached to handpieces for finishing restorations

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16
Q

Other abrasives (Non cutting-Not diamond)

Molded

A

Mounted (points and stones) vs. uncmounted (cutting discs and stonewheels)
Rigid (grinding and shaping) or flexible (finishing and polishing)

17
Q

Bladed instruments:

  1. Excavating/cutting burs
  2. Finishing burs
  3. The greater the number of blades?
A
  1. blades 6 or 8
  2. 10-20 (above 8)
    - color coded 10-12 red
    - 16-20 yellow
    - 30 white
  3. the smoother the finish
18
Q

Diamond instruments:

2- Diamond for abrasive cutting:

A

Used for extra coronal prep

shank color coded for degree of abrasiveness 
yellow: superfine
red: fine
Blue: med
Green: coarse 
Black: Super coarse

The abrading surface –> used for crown preps

19
Q

Bladed head design:

  1. Round 1/4 vs. 4
  2. Inverted Cone
  3. Pear shaped
  4. Plain cylindrical fissure 55-59
  5. Plain tapered fissure 169-172
A
  1. 0.5mm vs. 1.4
  2. 331-2-40:: Connical shape with flat ended bur
  3. 229-333:: 330–diameter is 0.8 with a length of 1.5 (this is wider distally) with 8 degree taper vs. 245 with 3.0 mm length and diameter of 0.8 (twice the size of a 330) with 4 degree taper
  4. paralalalal wall 57 bur with diameter of 1mm with flat end.
  5. diversion wall (with 171 we have distal end narrow and proxmial wider)
20
Q

bladed cutting recommended for what kind of preps?

A

intracoronal (bc into tooth aka into enaml –> dentin

21
Q

end cutting designate what number?`

A

900 (end only carries the cutting blades aka 956 that you use to flatten your surface)

22
Q

Cross cut designate what number?

A
  1. Also 700
23
Q

Abrasive cutting mechanism and what kind of burs?

A

Diamond bur– more efficient with brittle materials but NO BUENO with ductile material (dentin bc it deforms) …plastic deformations

24
Q

Rake face blade vs. Clearance face blade

A

rake face: forms the chips, the surface of the blade towards the direction of the cutting

Clearance face: clears the chips. Away from direction of cutting

25
Q

Blade Angle: Positive Rake angle

A 
Great for cutting
Forms larger chips
Can easily break
Sharper 
Small clearance space --> easily clogs
26
Q

Blade angles: Clearance angle

A

The angle that provides the clearance between teh tooth structure and cutting edge

purpose: prevents blade from rubbing on tooth surface
Bigger clearance angle= less friction = dulling minimized = bur life lengthened

^ Smaller the clearance angle the higher the chance of rubbing tooth –> friction –> duller –> less longevity!

27
Q

examination struments (none cutting)

A

mirror, explorer, periodontal probe

28
Q

what do you use explorer for and what kinds are there?

A 
#23 sheprads 
#2 pigtail
#17 interproximal

Use to detect caries –> check texture
Check margins of crowns

29
Q

perio probe?

A

measures cavity depth

30
Q

What is a four unit formula??

A

if blade and cutting edge not at 90 degrees

31
Q

What is a three unit formular?

A

if cutting edge and blade FORM 90 degrees

32
Q

Blacks instrument formula (3 units)

  1. 1st number
  2. 2nd number
  3. 3rd number
A
  1. width blade mm (10=1mm)
  2. length of blade mm
  3. angle between blade to the long axis of handle

ALSO NOT DEGREES! it’s in centrigrade

33
Q

restroative instruments

A

carrier, condenser, anatomical burnisher

34
Q

Methods of use: Direct Cutting

A

Force applied is PERPENDICULAR to cutting edge
Hold instrument paralallal to the wall
cutting edge in contact of wall being planed
Enamel hatchet

35
Q

Always cut from none bevel to bevel or bevel to none bevel?

A

Bevel to none bevel

36
Q

Chisel: ENAMEL hatchet

A

cutting edge parallel to long axis of handle
Direct and lateral cutting
double ended with R & L bevels

37
Q

Lateral cutting

A

indirect cutting/lateral cutting/ scrapping: force exerted is parallel to cutting edge

38
Q

Gingival margin trimmer will only?

A

indirect cutting

Operative (2 decks)

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