post dr. hicham nuaimi
TRANSCRIPT
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POST OR NOT TO POST ?
D R . H I C H A M N U A I M IB D S . P G D I P I M P L A N T O L O G YP G D I P R E S T O R AT I V E D E N T I S T R YM C L I N I N O P E R AT I V E A N D E S T H E T I C D E N T I S T R Y
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Treatment of Badly Destructive Teeth have huge controversy about the decision of whether or not posts should be used
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Restoring of badly destructive pulpless teeth have been reported since 18 centurey.
Pierre Fauchard in 1747 designed gold and silver posts.
Last decades fabricated Carbon posts due to its proper elastic modules and flexture resisitance
Due to upgrade in Esthetic demand, Scientist invest cotted Carbon post then glass and ceramic ones.
HISTORY
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Role for post placement IndicationsTypes Procedure
POSTS
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The primary purpose for a post is to retain a core that can be used to support the final restoration.
Posts do not reinforce endodontically treated teeth, and a post is not necessary when substantial tooth structure is present after a tooth has been prepared.
Roles for post placement
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Post placement is indicated if both of the following clinical conditions exist:The remaining coronal tooth structure is
inadequate for the retention of a restoration.When there is sufficient root length to
accommodate the post while maintaining an adequate apical seal.
Stockton L (1999).Factors affecting retention of post systems: A literature review. J Prosthet Dent;81:380–385.
Indications
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Anterior teeth mostly required post, due to the shearing forces and the narrow tooth dimensions.
While Large, bulky anterior teeth with minimal access preparation may not require a post
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Molar teeth rarely require a post unless there has been significant loss of tooth structure.
Posts are generally considered necessary for PM teeth because of their smaller diameter and the presence of high shear stresses.
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Types of Post
Metallic
Stainless Steel
TitaniumGold-Plated brass
Non Metallic
Carbon Fibre
Ceramic
Composite
Glass-fibre
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Stainless steel
Esthetic carbon fiber
Carbon fiber Ceramic
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Tapered smooth
Parallel serrated
Parallel threaded
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Prefabricated Threaded
Posts
Disdvantages
Stresses generate may
lead to fractureHigh invasive
Advantages
High retention
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Carbon Fiber Post
Advantages
Dentin bonding Easy removal
Disdvantages
Low strength esthetic problem
Lack of radiopacity
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Fiber Reinforced
Post
Disdvantages
Low strength failure rate
Advantages
Esthetic
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Zirconia Ceramic
Disdvantages
High stiffness High modulus of elasticity
Advantages
Esthetic
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Rodriques-Cervantes et.al (2007) stated that post must have elastic modules mimic to that of dentine or damage root structure
Tooth structure Elastic modules (Gpa)
Dentin 18.6
Fiber post 20
SS post 200
titanium 110
zirconia 300
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Damage to the root
Shear stress
internal
stress
zones of
tension
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Post Placement
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Post length
Post design
FACTORS
Post diameter
Stockton L (1999). Factors affecting retention of post systems: A literature review. J Prosthet Dent;81:380–385.
Ferrule effect
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The post should be > the IC or OC dimension of the crown.
The post should end halfway between the crestal bone and the root apex.
The post should be 2/3 the root length.
Post length
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Ideal Placement
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✔ ✖
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The diameter of the post is selected according to root anatomy.
A minimal dentin thickness of 1 mm around the post should be provided.
Post diameter
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Post preparation of the root canal space must not remove additional dentin leads to reduced fracture toughness
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NARROW MEDIUM LARGE
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Passive action posts lead the lest stress in the root dentine (parrallel, smooth)
Active action post lead the highest stress (threaded)
Post design
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Active postsMechanical bend
into dentin by threads
Passive postsDepend on cement
for retention
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What is Ferrule Effect
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is the circumferential ring of sound tooth structure that is enveloped by the cervical portion of the crown restoration.
A minimum sound dentine height of 1.5 - 2 mm is required between the core and crown margins.
Ferrule Effect
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Fernandes et al.(2003) stated that ideal post selection required:
Minimum preparation. Resistance to fatigue. Elastic modulus similar to dentin. Retentive (post & Head). Easy to adjust and fit. Easy Removal
Fernandes A., Shetty Sh., Coutinho I.(2003). Factors determining post selection: A literature Review. J Prosth. Dent. Dec. 2003.
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Is it indicated to use a post in all Badly
Destructive Tooth?
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Amount of remaining sound tooth structureOcclusal functionOpposing dentitionPosition of the tooth in the archLength, width and curvature of the roots
Endodontics : Restoring of Endodontically Treated Teeth American Association of Endodontics.1995 Dec Publication
Criteria for post placement
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LiteraturE ReviewS
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Ferrari et.al Fokkinga
SAMPLES240 endodontically-treated premolars in 210patients
307 endodontically-treated teeth in 257patients
TEST TREATMENT
Fiber posts for 2 years Cast post and corePre-fab metal post and composite core for 17 years
CONTROL TREATMENT
No post Post-free composite core
CONCLUSIONS
4 coronal wall remaining: no difference incomplication rates≤ 3 coronal walls remaining: post placementincreases survival rates
Where “substantial remaining dentin” is available, a post and core does not perform better than a post-free core
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Ferrari M (2007). Post placement affects survival of endodontically treated premolars. JDentRes;;86(8):729-734.
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Fokkinga W.(2007). Up to 17-year controlled clinical study on post-and-cores and covering crowns. J Dent;35(10):778-786.
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Salemeh et.al (2007) stated that the fracture loads of teeth restored with fiber posts were significantly greater than those without posts.
The fiber posts significantly contributed to the reinforcement and strengthening of pulpless teeth.
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D’Arcangelo et al. (2008) stated that fiber reinforced post restoration with veneer preparations (Max CI) did not show significant differences from the intact unprepared incisor.
Hajizadeh et al. (2009) showed that PM teeth when restored with the Post and composite were as strong as the unprepared tooth and stronger than those teeth restored with composite alone without a post.
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Jotkowitz et al. (2010) stated that the height, number of walls remaining, thickness of the walls in addition to ferrule effects on functional stress. They concluded that no ferrule equals un-restorable
Nam et.al (2010) stated that when the number of remaining walls decrease, the fracture resistance decreases, even without post. BUT the fracture resistance is significantly increased when fiber posts are placed.
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These huge controversy reviews about fiber post are
due to:
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Using of natural teeth or bovine teeth Type and quality of the post Effect of “secondary smear layer” on adhesion Effect of type of radicular dentin that is to be
bonded Types the adhesive used Types of cement used for post placement The amount of critical dentin that is removed to
place the post.
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Conclusion Badly destructive endodontic teeth are weaker,
so that it requires restorations to protect remaining tooth structure.
Ferrule effect is paramount to resist fracture and is more important than post design, material or luting cement.
Clinical success depends on application of sound biomechanical principles for the specific tooth.
More In vivo studies are required to distinguish a clear evidence for using of fiber post
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THANK YOU.