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PROSTHO > Lesson 11 > Flashcards

Lesson 11 Flashcards

1
Q

True or false

Inadequate root fillings should be re-treated before fixed prosthodontic treatment is begun

A

True

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2
Q

True or false

Additional retention from posts is rarely need ed in molars

A

True

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3
Q

True or false

FDPs (the bridge) was significantly lower than that of restorations under single crown

A

True

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4
Q

True or false

four to five years after cementation, reported failure rates were significantly higher in male patients than in female patients and failure rates were three times higher in patients older than 60 than for younger patients

A

True

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5
Q

True or false

maxillary failure rates (15%) were three times as high as mandibular failure rates (55%) and more prevalent in lateral incisors, canines, and premolars than in central incisors and molars

A

True

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6
Q

True or false

custom cast post and core restorations exhibited slightly higher failure rates than did amalgam foundations

A

True

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7
Q

True or false

CONSIDERATIONS FOR ANTERIOR TEETH
→ do not always need a complete crown after endodontics except when the size of plastic restorative materials limit their prognosis

A

True

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8
Q

True or false

CONSIDERATIONS FOR ANTERIOR TEETH endodontically treated teeth are weaker or more brittle than
vital teeth

A

True

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9
Q

True or false

CONSIDERATIONS FOR ANTERIOR TEETH endodontically treated teeth may reduce moisture content

A

True

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10
Q

True or false

CONSIDERATIONS FOR ANTERIOR TEETH

cementing a post in an endodontically treated tooth enhances
prognosis but limits endodontic treatment

A

True

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11
Q

True or false

CONSIDERATIONS FOR POSTERIOR TEETH

complete coverage is recommended on teeth with high risk of fracture like maxillary premolar

A

True

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12
Q

True or false

CONSIDERATIONS FOR POSTERIOR TEETH

→ if significant coronal tooth loss has occurred, a cast post and core restoration or amalgam foundation restoration is needed
→ complete coverage gives the best protection against fracture because the tooth is completely encircled by the restoration

A

True

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13
Q

→ minimal tooth structure removal for post space
→ remaining dentin thickness gives fracture resistance of the root
→ thinner dentin walls with thicker post fractures more easily
→ root canal should be enlarged, enough for the post to fit with
strength and retention

A

PREPARATION OF THE CANAL

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14
Q

→ adequate apical seat
→ minimum canal enlargement (no undercuts remaining)
→ adequate post length
→ positive horizontal stop (to minimize wedging)
→ vertical wall to prevent rotation (like a box)
→ extension of the final restoration margin onto sound tooth
structure

A

FEATURES OF SUCCESSFUL DESIGN

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15
Q

→ save as much coronal tooth structure to reduce stress concentration at the gingival margin
→ if more than 2 mm of coronal tooth structure is remaining, the post design has limited role in the fracture resistance of the restored tooth
→ coronal reduction to the gingival level before fabrication of a post and core should be avoided
→ preserving as much coronal structure as possible enhances prognosis

A

PREPARATION OF CORONAL TISSUE

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16
Q

→ extension of the axial wall of the crown apical to the wing tooth structure
→ help bind the remaining tooth structure together, while simultaneously preventing root fracture during function

A

FERRULE

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17
Q

True or false

Anterior crown and the post and core restoration are frequently dislodged simultaneously.

A

True

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18
Q

canals with elliptical cross section must be prepared with usually
6-8 degrees

A

POST GEOMETRY

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19
Q

→ parallel-sides posts are more retentive than tapered posts
→ threaded posts are the most retentive but should ensure
passivity

A

POST GEOMETRY

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20
Q

→ retention increases as post length increases
→ short post will fail while long post will damage apical seal or
increase root perforation

A

POST LENGTH

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21
Q

→ maintain 5 mm apical seal; 1 mm is considered acceptable
→ post should be as long as possible without jeopardizing apical
seal of strength of remaining tooth structure

A

POST LENGTH

22
Q

→ increasing post diameter to increase retention is not recommended because it weakened the remaining root structure
→ should not exceed one-third of the cross-sectional root diameter

A

POST DIAMETER

23
Q

→ serrated or roughened post is more retentive than smooth one
→ controlled grooving of the post and root canal increases the
retention of the tapered post

A

POST SURFACE TEXTURE

24
Q

True or false

adhesive resin luting agent have no potential to improve the performance of post and core restorations

A

False

adhesive resin luting agent have the potential to improve the performance of post and core restorations

25
Q

→ resin cement is affected by eugenol containing root canal sealer
→ zinc phosphate and glass ionomer have comparable retentive
properties

A

LUTING AGENT

26
Q

the choice of luting agent may become more important if the
post has poor fit within canal

A

LUTING AGENT

27
Q

→ long post should be avoided

→ two or more relatively short post in divergent canals, for better retention

A

RETENTION FORM in POSTERIOR TEETH

28
Q

→ when amalgam is used as the core material, it can be condensed around cemented post or directly into short prepared post space
→ single metal post will be used if there is reasonable amount of coronal tooth structure cemented into the largest canal
→ if there is remaining 3-4 mm thickness of coronal tooth structure, post is not necessary

A

RETENTION FORM in POSTERIOR TEETH

29
Q

→ greatest stress concentrated at the shoulder margin
→ stresses are reduced as post length increases
→ parallel-sided posts may distribute stress more than tapered
post

A

In Vitro Studies Conclusions:

30
Q

→ sharp angles should be avoided
→ high stress can be generated during insertion with smooth
parallel-sided post; threaded post shown to distribute stress
evenly if post are backed off a half turn
→ fracture may occur in glass fiber post rather than in the
remaining tooth structure

A

In Vitro Studies Conclusions

31
Q

→ preparation geometry is important to prevent a post with circular cross section from rotating during function
→ sufficient vertical coronal walls prevent rotation
→ small groove placed in the canal wall if coronal dentin has been
completely lost

A

ROTATIONAL RESISTANCE

32
Q

→ grooves should be placed where the root is bulkiest
→ auxiliary pin and threaded post can prevent rotation

A

ROTATIONAL RESISTANCE

33
Q

TOOTH PREPARATION (3) stages:

A

Removal of the Root Canal

Filling Material Enlargement of the Canal

Preparation of the Coronal Tooth Structure

34
Q

o using a warmed endodontic plugger
o using a rotary instrument with chemical agents (ex.:
eucalyptus oil)

A

REMOVAL OF THE ROOT CANAL FILLING MATERIAL
→ (2) methods commonly used to remove gutta-percha

35
Q

range widely in shape and size with varying radiopacity

A

Prefabricated Posts

36
Q

recommended for roots with circular cross section

A

Parallel-Sided Prefabricated Posts

37
Q

used for excessively flared canals

A

Custom Posts

38
Q

→ prepare post space
→ reduce coronal tooth structure for the extracoronal restoration
→ reduction depends on type of restoration

A

PREPARATION OF THE CORONAL TOOTH STRUCTURE

39
Q

readily available

A

Prefabricated Post

40
Q

wax or resin pattern

A

Custom Made Post

41
Q

radiographs are not normally necessary to verify post space

A

PREFABRICATED POSTS

42
Q

(1) Use in canals that have a non-circular cross section or extreme tapered canal
(2) Be extra careful on molars to avoid root perforations

A

CUSTOM MADE POST

43
Q

post is selected to match the dimensions of the canal and only minimum adjustments needed to seat it to the full depth of the post space

A

PREFABRICATED POSTS

44
Q

→ platinum-gold-palladium
→ cobalt-chromium
→ stainless steel

A

Parallel-Sided Posts

45
Q

→ stainless steel
→ titanium
→ non-oxidizing noble alloys

A

Serrated Posts

46
Q

→ platinum-gold-palladium
→ titanium alloys

A

Tapered Metal Posts

47
Q

→ consists of glass or carbon fibers embedded in a resin matrix
→ less stiffness and strength than ceramic and metal post
→ improve esthetics but shorter longevity than metal posts
→ ease of removal if endodontic retreatment is necessary

A

Composite Posts

48
Q

→ embedded in an epoxy matrix
→ comparable to carbon fiber post
→ translucent post is available

A

Glass Fiber Post

49
Q

→ excellent esthetic properties
→ high strength, rigid

A

Ceramic & Zirconia Posts

50
Q

→ made of cast metal or zirconia fabricated with CAD/CAM technology
→ cast metal post and core made from direct pattern fabricated in the patient’s mouth or indirect patterns fabricated in the lab

o direct pattern technique with light polymerizing resin &
auto-polymerizing resin is recommended for single canals
with good clinical access
o an indirect procedure is more appropriate when access is
more problematic or for multiple canals

A

CUSTOM MADE POSTS

PROSTHO (17 decks)

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