Endodontics Lecture 10: ADEX

What is the minimum size of canal instrumentation required before obturation for tooth #8?

Size 35 file

Why should the dam clamp not be placed on the treated tooth?

May separate crown from root

What should be used as the reference point for fill depth of the pulp chamber?

CEJ

What three things should not be placed in the pulp chamber?

1. Temporary filling

2. Cotton pellet

3. Restorative

How far from the incisal edge should the #8 preparation be?

> 2 mm

How far from the lingual CEJ should the #8 preparation be?

> 3 mm

How far from the mesial marginal ridge should the #8 preparation be?

> 1 mm

How far from the distal ridge should the #8 preparation be?

> 1 mm

How far should you penetrate with the round bur for #8 preparations?

2 - 3 mm (Feel drop)

What angle from the long axis of the tooth should the bur be oriented for the #8 preparation?

15°

In what direction should you extend first for the preparation for tooth #8?

Inciso-cervically

In what direction should you extend second for the preparation for tooth #8?

Mesio-distally

What tool should be used to check the final access?

Explorer

What is the working length for tooth #8?

24 mm

What tool should you use to establish the initial apical file size?

K-file #15

How many files should you use to extend the initial apical file size?

3 - 4

What tool should you use to establish the master apical file size?

K-file #35

How many files should you use to extend the master apical file size with the step-back technique?

3

What is the gutta percha size you should first use to reach the working length?

35

What are the two criteria for the canal in the ADEX?

1. Continuous taper

2. Appropriate location

What are the two criteria for the mid-root in the ADEX?

1. Blends smoothly

2. No ledges/shoulders

How far apical to the CEJ should the gutta percha tip be?

< 3 mm

How far coronal to the CEJ should the gutta percha head be?

< 2 mm

How far from the mesial marginal ridge should the #14 preparation be?

> 2 mm

How far from the MB and DB cusps should the #14 preparation be?

> 1 mm

How far from the distal oblique groove should the #14 preparation be?

> 1 mm

How far from the mesial lingial cusp tip should the #14 preparation be?

> 1 mm

How far should the DB cusp be from the buccal groove for tooth #14?

0.5 mm

How far should the MB cusp be from the buccal groove for tooth #14?

1.5 mm

How deep should you penetrate the enamel for tooth #14?

3 mm

What should be done regularly to soften the wax for #14 preparations?

Irrigation

What is the access marking methods for finding the canals?

Chicken foot access

What must be entirely removed from the #14 preparations?

Roof of pulp chamber

How distal to the triangular fossa should the #14 preparation be?

0.5 - 1 mm

What shape should be made from the palatal and MB canals for #14?

Straight line

What should the shape of the access be for tooth #14?

Triangle

How far should the pulpal floor be from the buccal cavosurface margin?

< 10 mm