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Esthetic post systems/ dental crown & bridge courses
1. Esthetic postEsthetic post
systemssystems
INDIAN DENTAL ACADEMYINDIAN DENTAL ACADEMY
Leader in continuing Dental EducationLeader in continuing Dental Education
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2. contentscontents
IntroductionIntroduction
Effects of endodontic treatment on teethEffects of endodontic treatment on teeth
Considerations for anteriro and posteriorConsiderations for anteriro and posterior
teethteeth
Requirements of postsRequirements of posts
Key features of post and core designKey features of post and core design
Factors affecting selection of postsFactors affecting selection of posts
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3. Factors affecting retention of postsFactors affecting retention of posts
Classification of esthetic post systemsClassification of esthetic post systems
Properties of fiber post systemsProperties of fiber post systems
Clinical techniquesClinical techniques
CementationCementation
SummarySummary
ConclusionConclusion
referencesreferences
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5. Effect of endodonticEffect of endodontic
treatment on teethtreatment on teeth
Tooth structure after endodonticTooth structure after endodontic
treatment weakened by previoustreatment weakened by previous
episodes ofepisodes of
FractureFracture
Tooth preparationTooth preparation
RestorationRestoration
Endodontic manipulationEndodontic manipulation
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6. Loss of tooth structureLoss of tooth structure
Altered physical characteristicsAltered physical characteristics
Altered esthetic characteristicsAltered esthetic characteristics
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7. considerationsconsiderations
Anterior teethAnterior teeth
Intact , non-vital , has not lost toothIntact , non-vital , has not lost tooth
structurebeyond access cavity preperationstructurebeyond access cavity preperation
Less risk of fractureLess risk of fracture
Sealing the access cavitySealing the access cavity
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8. considerationsconsiderations
Anterior teethAnterior teeth
Intact , non-vital , has lost significantIntact , non-vital , has lost significant
tooth structuretooth structure
More risk of fractureMore risk of fracture
crown retained by dowel and corecrown retained by dowel and core
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9. Posterior teethPosterior teeth
Depends on remaining tooth structureDepends on remaining tooth structure
If adeqaute tooth structure present , coreIf adeqaute tooth structure present , core
and crown is sufficientand crown is sufficient
If inadeqaute, post and core with crownIf inadeqaute, post and core with crown
necessarynecessary
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11. Requirements of postRequirements of post
and coreand core
Physical properties similar to dentine
Maximum
Retention with little removal of dentin
Distribution of functional stresses evenly along
the root surface,
Esthetic compatibility with the definitive
restoration and surrounding tissue,
Minimal stress during placement and
cementation,
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12. Resistance to displacement,
Good core retention,
Easy retrievability,
Material compatibility with core,
Ease of use, safety and reliability,
Reasonable cost.
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13. Key features for aKey features for a
succesful post and coresuccesful post and core
designdesign
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14. Factors determiningFactors determining
selection of postsselection of posts
Root lengthRoot length
Greater the post
length, the better the
retention and stress
distribution
Reserve 3 to 5mm of
apical gutta-percha
to maintain the apical
seal
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15. Tooth anatomyTooth anatomy
A consideration of the root size and length is
important, because improper post space
preparation and use of large-diameter posts
present the risk of apical or lateral
perforation.
An active post can initiate cracks in the thin
dentinal wall
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16. Post widthPost width
Preserving tooth structure, reducing the
chances of perforation, and permitting the
restored tooth to resist fractures are criteria
in selection of the post width
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17. Lloyd PM, Palik JF. The philosophies of
dowel diameter preparation: a literature
review. J Prosthet Dent 1993;69:32-6.
Selection of post width sumarised bySelection of post width sumarised by
Lloyd and palik into 3 categoriesLloyd and palik into 3 categories
Conservationist
Preservationist
Proportionist
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18. Canal configuration and post adaptabilityCanal configuration and post adaptability
Canal configuration aids in making a choice
between a custom-designed post and a
prefabricated post
If post confirms to the shape of the canal
closly more conservative procedure
more resistance to fracture
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19. Coronal structureCoronal structure
The bulk of the tooth above the restorative margin
should be at least 1.5 to 2 mm to achieve resistance
form.
Teeth restored with carbon fiber posts had inferior
strength compared with those restored with metal
posts when subjected to forces simulating those in a
clinical setting
(Sidoli GE, King PA, Setchell DJ. An in vitro evaluation of a carbon
fiber based post and core system. J Prosthet Dent 1997;78:5-9.)
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20. Carbon fiber post system, can be used
when ample coronal dentin remains and
the crown is well supported by remaining
tooth structure; otherwise, cast post and
core may be used when there is
moderate to severe tooth loss.
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21. SStresstress
Post and core–restored endodontically
treated teeth are subjected to various types
of stresses:
compression,
tensile, and shear
An increase in the post length with diameter kept
to a minimum will help to reduce shear stresses
and preserve tooth structure
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22. Torsional forcesTorsional forces
Intraorally, post and core–restored teeth are
subjected to various types of forces.
Torsional forces on the post-core-crown unit
may lead to loosening and displacement of
the post from the canal, causing failure of
the system
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23. Role of hydrostatic pressureRole of hydrostatic pressure
Cementation plays a significant role in
enhancing retention, stress distribution, and
sealing irregularities between the tooth and
the post
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24. Post designPost design
Classified according to shape design and surfaceClassified according to shape design and surface
characteristics.characteristics.
According to shape designAccording to shape design
Parallel sidedParallel sided
TaperedTapered
Parallel tapered combinationParallel tapered combination
According to surface characteristicsAccording to surface characteristics
Active and passiveActive and passive
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25. Post materialPost material
Metal post systemsMetal post systems
Carbon fiber postsCarbon fiber posts
Zirconia postsZirconia posts
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26. (Mannocci E, Ferrari M, Watson TF. Intermittent loading
of teeth restored using quartz fiber, carbon-quartz fiber
and zirconium dioxide ceramic root canal posts. J
Adhes Dent 1999;1:153-8.)
Bonding abilityBonding ability
Resin luting agents showed good adhesion
to carbon
Fiber posts and glass fiber posts.69 The
adhesion to zirconia posts was found to be
unsatisfactory.69 It was also observed that
to improve retention, the carbon fiber post
did not require any surface treatment as
compared with the zirconia post.
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27. Core materialCore material
RetrievebilityRetrievebility
EstheticsEsthetics
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28. Factors affecting theFactors affecting the
retention of postsretention of posts
Post lengthPost length
The post should equal the incisocervical
or occlusocervical dimension of the
crown.
The post should be as long as possible
without disturbing the apical seal
Short posts are especially dangerous
and have a much higher failure rate
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29. Post diameterPost diameter
Increasing the diameter of the post does not provide
a significant increase in the retention of the post;
however, it can increase the stiffness of the post at
the expense of the remaining dentin and the fracture
resistance of the root.
post diameter must be controlled to preserve
radicular dentin, reduce the potential for
perforations, and permit the tooth to resist fracture
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30. Luting cementsLuting cements
Resistance formResistance form
Stress distributionStress distribution
Rotational resistanceRotational resistance
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32. Classification ofClassification of
esthetic postsesthetic posts
Polyethylene fiber postsPolyethylene fiber posts
RibondRibond
Glass fiber postsGlass fiber posts
Fibrekor posts (Generic Pentron)Fibrekor posts (Generic Pentron)
Carbon fiber postsCarbon fiber posts
ComposipostComposipost
C – Post systemsC – Post systems
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33. Quartz fibers bound in an epoxy matrixQuartz fibers bound in an epoxy matrix
D T Light post (Bisco Usa)D T Light post (Bisco Usa)
Astheti Plus postsAstheti Plus posts
Light postsLight posts
Ceramic postsCeramic posts
Direct methodDirect method
Cerapost (Lemgo, Germany)Cerapost (Lemgo, Germany)
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