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Flashcards in Instrumentation Deck (90)
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1

Diameter of head of Gates Glidden burs

1=0.5, 2=0.7, 3=0.9, 4=1.1, 5=1.3, 6=1.5

2

When does apical transportation occur most?

In curved canals enlarged beyond a no. 25 S.S. file

3

What is cyclic fatigue?

Opposite sides of the file receive tension and compression, which eventually breaks the file

4

What does the EAL measure?

Impedance (tells you when you approach or enter the PDL)

5

When do you treat a curved canal as a straight canal?

When the degree of curvature is less than 30 degrees

6

Two authors who recommend using stainless steel k files to create a glide path?

West 2005, Ruddle 2006

7

What rpm to run K3's at?

350. At this RPM, they plane.

8

Who said pre-flaring of canals increases efficacy of rootZX?

Ibarrola 1999

9

Ibarrola 1999

apex locator

Pre-flaring of canals increases efficacy of rootZX (although not by an amount that matters clinically) .04 v. .4

10

Who said: In vivo, the Root ZX can locate the apical constriction within 0.5 mm 82.5% of the time, and is equally accurate in necrotic and vital cases

Dunlap 1998

11

Dunlap 1998

In vivo, the Root ZX can locate the apical constriction within 0.5 mm 82.5% of the time, and is equally accurate in necrotic and vital cases

12

Ounsi and Naaman 1999

The Root ZX gave measurements in vitro within a range of 0.5 mm from the apex in 84.72% of the cases. The intra-operator and inter-operator variabilities were not statistically significant. Said just go to the apex, don't try to measure .5 mm back.

13

Who said: The Root ZX gave measurements in vitro within a range of 0.5 mm from the apex in 84.72% of the cases. The intra-operator and inter-operator variabilities were not statistically significant

Ounsi and Naaman 1999

14

Who says:Ex vivo, the Elements Diagnostic Unit can locate the apical constriction within 0.5 mm 94.3% of the time

Plotino 2006

15

Plotino 2006

EAL

Ex vivo, the Elements Diagnostic Unit can locate the apical constriction within 0.5 mm 94.3% of the time

16

Who said prognosis of root perfs is dependent on prevention or treatment of bacterial infection at perf site.

Fuss and Trope 1996

17

Fuss and Trope 1996. What are the three things that determine outcome of a root perf?

Time: sooner is better
Size: smaller is better
Location: better if not in the critical zone- level of crestal bone and epithelial attachment.

18

Who showed that neither the first K file or lightspeed instrument to bind at working length accurately reflected the apical constriction diameter? 75% bound one wall. 25% bound zero walls.

Wu and Wesselink 2002

19

What did Wu and Wesselink show in 2002? (first file to bind)

That the first file to bind at working length is not necessarily indicative of the apical constriction diameter. 75% of files bound only 1 wall, and 25% no walls.

20

What is the tip size of S1 and S2 protaper? taper?

.17 mm and .20 mm taper: variable

21

What RPM and torque should S1 and S2 be run at?

S1: 300 RPM 3-4 Ncm
S2: 300 RPM 1-1.5 Ncm

22

Who evaluated the giromatic handpiece in 1967 by rotating a barbed broach a quarter turn in both directions, moving 2-4 mm up and down. Decided not perfect, but can be used with caution.

Alfred L. Frank

23

What did Alfred L. Frank report on in 1967

The giromatic handpiece (a barbed broach rotating a quarter turn in both directions.)

24

Who first advocated standard sizes for files?

John Ingle in 55 and 61

25

What was John Ingle's argument in 55 and 61?

Since improper obturation was leading cause of failures, we need uniformity in instrumentation and filling materials.

26

What did Gambirini find out about NiTi rotary in 2001?

There is statistically higher resistance to cyclic fatigue for NiTi rotary instruments used at lower torque values.

27

Who showed There is statistically higher resistance to cyclic fatigue for NiTi rotary instruments used at lower torque values.

Gambirini 2001

28

Who showed that the root ZX works equally well in the presence of lidocaine, NaOCl, RC prep, liquid EDTA, 3% H202, peridex

Jenkins 2001 (Mears did the same study)

29

Jenkins 2001 rootzx

showed that the root ZX works equally well in the presence of lidocaine, NaOCl, RC prep, liquid EDTA, 3% H202, peridex

30

Who found that no technique or instrumentation will predictably produce a round prep in the apical portion? (The roundest prep possible is K file with reaming)

Jungmann and Uchin 1975