Fixed Prosthodontic Lecture 4

Front 1

The strength of an endodontically treated tooth is directly related to what?

Back 1

The amount of remaining dentin

Front 2

What are the key determinants in the functional weakening of the tooth?

Back 2

1-Loss of tooth structure
2-Destruction of the marginal ridges

Front 3

Anteirot teeth that have intact marginal ridges or even small Class III restorations, can be restored by what?

Back 3

-Restored by sealing hte lingual access and restoration with both enamel and dentin bonded composite resin restoration

Front 4

When is post required on an anterior teeth?

Back 4

-The reduction of the axial surfaces during crown preparation will increase the potential for fracture of this unsupported tooth structure during occlusal loading

Front 5

For anterior teeth not requiring complete coverage restorations, ___ ___ is not indicated.

Back 5

A cemented post

Front 6

List the order of stiffness of endodontically treated teeth and restorative treatment option?

Back 6

Cast Gold Onlay: 2.11
Unaltered Tooth: 1
CR with Enamel and Dentin Bonding: .89
CR with Enamel Bonding Only: .51
Amalgam: 0.35

Front 7

Should the endoontic access be conservative, __ ___ ___ ___ has occured, a ____ ____ ___/___ , and composite resin may be placed.

Back 7

-No loss of marginal ridges
-Glass ionomer liner/base

Front 8

When is an MOD only the treatment of choice?

Back 8

-If coronal destruction is minimal and one or both marginal ridges are invovled, a MOD onlay (full occlusal and cusp coverage) is the treatment of choice

Front 9

Describe the force of mastication on normal vs. treatment occlusion surface?

Back 9

Normal: upward force is dispersed toward buccal and lingually.
Treatmend: upward force is dispersed toward the center.

Front 10

With increasing amt. of tooth loss and the need for a core build-up, the next in sequence is what?

Back 10

Use of pulp chamber lug, whereby gutta percha is removed from the pulp chamber and coronal 2-4 mm into the canal(s)

Front 11

Further increase in tooth loss, may necessitate the use of ______ retentive features such as ____ and _____.

Back 11

-Auxiliary retentive features such as slots and pins

Front 12

Traditionally, pins have been thought to be contraindicated in endodontically treated teeth, however, ___________.

Back 12

However, if surrounded by at least 1 mm of dentin in all directions, currently designed pin systems are safe to use

Front 13

What is used ONLY as a last resort?

Back 13

-Placement of a post and core
-This is used only when there is not enough tooth structure remaining to retain a core by itself.

Front 14

In general, it is recommended that the use of post on endo. treated teeth (T/F)

Back 14

False: Recommended that the use of posts should be avoided whenever possible

Front 15

What is the sequence of post preparation?

Back 15

1. Removal of the root filling material
2. Enlargement, or shaping, of the root canal space, and
3. Preparation of the remaining coronal tooth structure

Front 16

Whenever possible, the post should be prepared when?

Back 16

At the time of the endodontic fill, since that practitioner is most familiar with the length and morphology of the root canal space.

Front 17

When creating a post space, only ________________, as the thickness of the remaining dentin is the _____ _____ in the fracture resistance of the remaining root.

Back 17

-Minimal amount of tooth structure should be removed
-Prime variable

Front 18

List the different type of post shape vs. retention?

Back 18

Kuror > FlexiPost > Radix > ParaPost > Tapered

Front 19

Post retention is directly proportional to ___ ___

Back 19

-Post length

Front 20

What is more important in determining stresses in the cervical regions (Post Length / Post width)

Back 20

-Post length is more important

-The longer the post, the less stress in the cervical area of the tooth.

Front 21

What is the general consensus for leaving apical gutta percha to maintain an apical seal?

Back 21

4-6 mm of apical seal

Front 22

The post length necessary to retain the core and crown has not been clearly established (T/F)

Back 22

True

Front 23

What is ferrule?

Back 23

-Ferrule: is a circumferential band of cast metal at the margin of the crown

Front 24

The encirclement of the tooth provided by a ferrule will help what?

Back 24

Help prevent splitting of the tooth when lateral wedging forces are encountered

Front 25

A ferrule height of at least ___ mm is required to ensure good restoration prognosis

Back 25

1.5 mm

Front 26

____ was more important than ____ in increasing fracture resistance of crowned teeth.

Back 26

-Ferrule lenth is more important than Post length in increasing fracture resistance of crowned teeth

Front 27

The post with the best prognosis has the most ____ ___ ___?

Back 27

-Basic Premis: The post with the best prognosis has the most root structure remaining

Front 28

Why is increasing post width and diameter to increase retention BAD?

Back 28

-Increasing post width, diameter, to increase retention is NOT recommended as it ONLY further weakens the remaining root