Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Endodontics > Pre-Op Sessions > Flashcards

Pre-Op Sessions Flashcards

(50 cards)

Start Studying
1
Q

What are the design objectives?

A
  • Create a continuously tapering funnel shape
  • Maintain apical foramen in original position
  • Keep apical opening as small as possible
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the process of a root canal?

A
  • Coronal access to RC system
  • RC instrumentation and preparation
  • Obturation of RC system
  • Coronal seal
  • Final restoration
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Before treatment what must be done?

A

take a peri apical radiograph to show all root and 2/3 mm of surrounding tissue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the objectives of access cavity prep?

A
  • Remove entire roof allowing complete removal of pulpal tissue
  • Allow visulisation of RC entrance
  • Produce smooth walled prep with no overhangs
  • Allow unimpeded straight line access of instruments
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the ISO colour codes?

file tip size

A

White = 15, 45
Yellow = 20, 50
Red = 25, 55
Blue = 30, 60
Green = 35, 70
Black = 40, 80

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the 3 lengths of ISO instruments?

A

21, 25, 31mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the files made from?

A

stainless steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What length is the cutting flute?

A

16mm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is d1?

A

diameter at the first rake angle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the taper of the file?

A

0.32mm over the 16mm, or 0.02mm per millimetre

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is d2?

A

tip of the file

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the diameter of the file at d2?

A

apical size of the root canal plus 0.32mm.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is a 02 ISO taper?

A

It has a diameter of 0.2mm at the D1 level.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Why is a flexible k file advantageous?

A

Cross-sectionalshapeallows greater flexibility

used in rotation or filing motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are the 4 file motions?

A
  • Filing
  • Reaming
  • Watch-winding
  • Balanced Forced Motion
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What technique does the modified flare use?

A

Uses the balanced force technique

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the balanced force technique used for

A

– to enlarge/flare the coronal part of root canal
– to negotiate the narrower apical part of canal
– to flare the apical part of canal by step-back technique

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Why is coronal pre flaring done?

A

– Avoids hydrostatic pressure in canal
– Early removal of heavily contaminated contents
– Improved straight line access to apical 1/3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is coronal pre flaring?

A

widen the coronal (top) portion of a root canal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What tool is used for coronal pre flaring?

A

gates glidden bur (not 1)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Where should the working length be?

Study These Flashcards
A
  • WL should be as close as possible to CDJ
    *This is usually the narrowest part of the
    canal – apical constriction
22
Q

How is the CWL determined?

Study These Flashcards
A
  • Radiographically
    – Length should be 1mm from radiographic apex
  • EAL - electronic apex locator
  • Paper point determination
23
Q

What is the max distance in a radiograph for the CWL?

Study These Flashcards
A

1mm from apex

24
Q

What is the estimated working length and how is it obtained?

Study These Flashcards
A

– Estimated length at which instrumentation should be limited. Obtained by measuring pre-operative radiograph to determine distance between coronal reference point and radiographic apex then subtracting 1mm.

25
What is the corrected working length and how is it obtained?
Length at which instrumentation and subsequent obturation should be limited. Obtained by the use of an electronic apex locator and/or working length radiograph.
26
What is the master apical file?
The largest diameter file taken to working length and therefore represents the final prepared size of the apical portion of the canal at the working length.
27
What sealer is used?
epoxy resin
28
What should happen with the master cone?
tug back with tweezers apical portion must remain undistorted when at length
29
Where should accessories stop?
1-2mm short of WL
30
What is the law of symmetry 1?
Except for maxillary molars, the orifices of the canals are equidistant from a line drawn in a mesial-distal direction through the pulp-chamber floor
31
What is the law of symmetry 2?
Except for the maxillary molars, the orifices of the canals lie on a line perpendicular to a line drawn in a mesial-distal direction across the center of the floor of the pulp chamber
32
What is the law of color change?
The color of the pulp-chamber floor is always darker than the walls
33
What is the law of orifice location 1?
The orifices of the root canals are always located at the junction of the walls and the floor
34
What is the law of orifice location 2?
The orifices of the root canals are located at the angles in the floor-wall junction
35
What is the law of orifice location 3?
The orifices of the root canals are located at the terminus of the root developmental fusion lines
36
How many laws are there?
6 2 symmetry 1 color 3 orifice
37
Maxillary 1st premolar | roots, canals
roots = 1/2/3 canals = mostly 2, rarely 1
38
Maxillary 2nd premolar | roots, canals
roots = 1/3 canals = mostly 1, sometimes 2
39
Maxillary 1st molar | roots, canals
roots = 3 canals = mostly 4, rarely 3
40
Maxillary 2nd molar | roots, canal
roots = 3 canals = mostly 3, somtimes 4
41
Mandibular 1st premolar | roots, canals
roots = 1 canals = mostly 1, sometimes 2
42
Mandibular 2nd premolar | roots, canals
roots = 1 canals = mostly 1, sometimes 2
43
Mandibular 1st molar | roots, canals
roots = 2/3 canals = mostly 3, sometimes 4
44
Mandibular 2nd molar | roots, canals
roots = 2 canals = mostly 3, sometimes 2 or 4
45
What are the angles of reciprocation?
150 degrees counterclockwise 30 degrees clockwise
46
What is the tip is reciproc?
non cutting s-shaped cross section
47
What are the 3 sizes for the reciproc system?
R25 0.25 R40 0.4 R50 0.5
48
What is different in reciproc blue?
heat treatment on traditional NiTi alloy better centering in the canal due to higher flexibility suitable for strongly curved canals can be pre bent for better accessibility or bypassing ledges silver colored shaft
49
What is a glide path?
a smooth, patent passage from the coronal orifice of the canal to the radiographic terminus or electronically determined portal of exit
50
What's the difference between glide path and patency?
**Glide path** A smooth passageway that extends from the canal's opening at the pulp chamber floor to the opening at the root's apex. The purpose of a glide path is to create a canal diameter that's the same size or larger than the first rotary instrument that's used. **Patency** The maintenance of a clear canal, especially the apical portion, to prevent debris from building up. Patency is important because it prevents blockage and short obturation. A small file is maintained near or slightly beyond the apical foramen throughout the procedure.

Endodontics (11 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions