377:. Utilizing the longest possible post ensures that the forces transmitted from the crown are distributed over as much of the root as possible. Using the appropriate diameter post ensures that as much natural tooth structure as possible is left to support the post and absorb the transmitted forces. A parallel post ensures the greatest retention of the post within the canal, and is perhaps utilized with only the slightest loss of tooth structure to the internal wall of the canal. A smooth-surfaced post transmits all the forces apically, which can cause fracture. Threaded or roughened posts, however, distribute the forces along the canal and are also more retentive than smooth posts. The ideal post is therefore parallel and threaded/roughened.
381:
endodontically treated tooth. This inherent drawback is taken into account when the prognosis of the finished restoration is determined and explained to the patient prior to the onset of treatment. It is because of this increased risk of failure inherent in the use of post and core restorations that, when all of the independent failure rates of the many procedures needed for the restoration of the tooth are considered together (endodontic treatment, crown lengthening (when indicated), post and core and prosthetic crown), the patient is sometimes advised to have the tooth extracted and an
267:
circumferentially further apical to the core. Non-metallic posts are also more aesthetic than metal posts as metal posts will shine through all-ceraminc restorations and non-metallic posts' optical properties are closer to tooth tissue (except for carbon fibre posts due to the darker material). Non-metallic posts are easier to remove from teeth if needed than metal posts. Direct use of non-metallic posts in the most common use but they can also be built up in the laboratory.
126:
183:
266:
Overall, non-metallic posts show a lower incidence of root fracture due to their ability to resist high stress without permanent deformation and breaking. Non-metallic posts should not be used if there is insufficient sound tooth tissue (ferrule). The sound tooth tissue should be at least 1.5 mm
133:
In post and core fabrication, it is desirable that the post descend at least two-thirds of the length of root canal (or not less than the height of the crown) in order to provide sufficient retention. Width of post should be taken into account for maximum strength and resistance to fracture, however,
292:
Fibre reinforced resins are a form of non-metallic posts and include carbon fibre, fibreglass and woven polyethylene ribbon-reinforced composites. These posts are more flexible, more aesthetic, and they have similar properties to dentine. However, they can only be used when there is sufficient tooth
142:
anastomose with the exterior surface of the root. Should these lateral canals not be blocked with the gutta percha and the cement used to place the gutta percha, the chances of microleakage and percolation of microbes are greatly increased, thereby increasing the likelihood of an endodontic failure.
85:
When it is not possible to retain a core on a posterior tooth and a post is required, no more than one post should be used per tooth, and this should be placed in the largest canal available. This is because more than one preparation for a post will involve excessive dentine removal and increase the
108:
root canal filling material, some gutta percha is removed from the canal space. Gutta percha can be removed mechanically (use of Gates
Glidden), thermally (use of System B Tip), and chemically (use of chemical solvents, however this method is not advocated nowadays due to difficulty in controlling
342:
There are also prefabricated posts for which cores are cast onto. These posts are usually made of Type IV gold alloy (containing gold, platinum, palladium and iridium) or platinum, gold and iridium alloys, which are compatible with palladium and silver-free alloys or platinum, gold, palladium and
190:
Prefabricated post and cores take less time to place, as they do not involve any lab work and can be inserted immediately upon the decision to utilize them, once the endodontic therapy has been completed and the post space cleared of gutta percha. After the prefabricated post is properly cemented
310:
Glass fibre posts are less brittle than ceramic posts. Posts that have unidirectional fibres are the strongest. However, it is difficult to produce this type of material as fibre bundles require infiltration and wetting with resin. This process can often leave voids on the surface of the fibres,
70:
is improved retention of the crown. However, there are also disadvantages, during the preparation for the post space there is a risk of perforation, a post can also make a tooth more likely to fracture, it makes future orthograde root canal treatment much more difficult and finally it is very
380:
The use of a post and core does not strengthen the tooth prior to restoration with a crown; rather, it may contribute to the weakening of the tooth structure, as the forces placed upon the future prosthetic crown and core are now transmitted along virtually the entire length of the brittle,
34:
The role of the post is firstly to retain a core restoration and crown, and secondly to redistribute stresses down onto the root, thereby reducing the risk of coronal fracture. The post does not play any role in reinforcing or supporting the tooth and can in fact make it more likely to
275:
Zirconia posts have high strength. However, they are brittle and have a high modulus which can potentially lead to root fracture. It can be difficult to remove the posts if needed. Zirconium posts can't be etched, thus leading to difficulty in retention of composite core.
214:
In cases where the post space is not a good match for a prefabricated post, a cast post and core can be custom fabricated for the tooth. A resin pattern is produced by placing a preformed plastic "burnout" post into the post space and a resin material, such as
486:
A light bodied addition silicone material is syringed in the orifice and around the prep ensuring the prep is completely covered, before a heavier bodied addition silicone material in a stock tray is seated over the prep to make the impression of the full
405:
to flow down below the margin preparation lines and into the orifice. The use of the gingival retraction cord is a safe method as when used correctly will not harm the gingival tissues whilst ensuring the detail recorded is of good quality.
301:
Carbon fibre posts show very little deformation and are able to absorb and transfer forces similarly to dentine. However, these posts can be dark in colour which may lead to an unaesthetic result as the post can shine through the tooth.
416:
Once the cord has been left in place for the required length of time, it is removed allowing the sulcus to be rinsed and dried in order to prevent the haemostatic agent from creating problems with the set of the impression material.
338:
Stainless steel, titanium, titanium alloy and gold alloy are used to construct prefabricated posts. These type of posts are usually placed in the post space and the core is constructed with a direct restorative core material.
195:, can be packed around the cemented post. After the material has been cured or has had a chance to set and properly formed into a crown preparation, an impression can be taken for the fabrication of a prosthetic crown.
82:. The primary reason for this is that multi-rooted teeth have a large pulp chamber which can be utilised for retention of the core and therefore the crown, whereas anterior teeth are much smaller and less retentive.
479:
The occlusal end is trimmed until it is at the same level as the adjacent teeth and is made retentive with the use of a heated instrument. Lubricant is painted on the portion lying within the canal to aid its
392:
increases the contact surface area between the core and involved hard tissue of tooth significantly, therefore this system does not require a post with at least 2/3 of the root canal depth as its indication.
137:
It is important to leave at least 4 mm-5 mm of gutta percha at the apex of the root canal, even at the expense of a longer post, because it is within the apical 4 mm of the root canal that the
146:
It is not necessarily the length of the post within the root canal that provides for retention of the core, and thus the eventual crown, but rather the length of post that will exist within root structure
110:
443:
The wall of the canal is lubricated before the self-cure resin is placed within the intra-radicular portion of the canal around the post to ensure it has adhered and adapted to the post correctly
169:
In the picture at right, the two teeth on the extreme left and right are the ones under discussion. The two teeth in the middle have been endodontically treated, but do not have post and cores.
446:
Once set, the post is removed and examined for deficiencies. If any deficiencies are present that are not minor enough to be managed with wax, a remake of the impression will be required
409:
The various types of gingival retraction cords that can be used are twisted, braided and knitted. The use of all three requires pre-soaking in either water or an agent that encourages
86:
fracture risk. A better alternative to posts on a posterior tooth is core restoration which extends down into the entrance of the root canal through the Nayyar technique using an
284:
Ceramic posts are made from a brittle material. These posts can be too strong which can lead to root fracture. It can be difficult and even impossible to remove a ceramic post.
219:
resin, is used to build up the tooth to the proper dimensions. When this is completed, the pattern resin/plastic post is removed from the tooth structure and attached to a
117:
area to maintain an apical seal. This procedure does not even require local anesthesia as the tooth has long been dead after the root canal treatment and no pain is felt.
1056:
963:
838:
113:
to the remaining gutta percha, called the post space, is now available within which to place a post. It is desirable to leave sufficient root filling material in the
90:
dowel–core. In this technique, retention for the amalgam-core is derived from the remaining pulp chamber and the prepared canals by extending amalgam to these areas.
473:
The post is bevelled to ensure a better fit within the canal as the preparation for the post will end in a point due to the instruments used for the preparation
401:
To ensure accurate recording of the preparation and finish line, gingival retraction is needed. Its use displaces the gingival tissues long enough to allow the
1260:
154:. If the post is 16 mm long, but only extends 4 mm into root structure that is surrounded by solid bone, the restoration will have a poor
27:
required where there is an inadequate amount of sound tooth tissue remaining to retain a conventional crown. A post is cemented into a prepared
1152:
223:
former, much in the same way as is done with the wax pattern of a crown, and a single-unit cast post and core can thus be fabricated out of
94:
42:
When deciding whether or not a tooth requires a post and core crown rather than a conventional crown, the following must be established:
71:
destructive and requires excessive removal of tooth tissue. The presence of ferrule can increase the fracture resistance of the post.
97:. Both of these systems employ a post that is placed within the root canal of the tooth being restored. Thus the tooth must first be
1183:
1146:
1116:
1084:
1032:
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881:
657:
977:
Abduljabbar, Tariq; Sherfudhin, Haneef; AlSaleh, S.A.; Al-Helal, Abdulaziz A.; Al-Orini, Saleh S.; Al-Aql, Naif A. (January 2012).
763:
560:
Cheung, William (May 2005). "A review of the management of endodontically treated teeth. Post, core and the final restoration".
359:
There are many types of post designed available for post and cores, utilizing various combinations of the following properties:
1405:
1474:
1253:
1194:
452:
The occlusal clearance is assessed and the pattern is examined for a final time before sending to the laboratory for casting
202:-reinforced composite resin post systems which offer improved resistance to untreatable fracture of tooth substrate such as
1410:
1106:
1074:
979:"Fracture resistance of three post and core systems in endodontically treated teeth restored with all-ceramic crowns"
905:
1342:
1246:
413:. The haemostatic agent controls gingival haemorrhage following the preparation and prior to impression making.
1427:
789:"Evaluation of occlusal fracture resistance of three different core materials using the Nayyar core technique"
440:
The material used with the post to create the pattern for both the post and core is a self-cure acrylic resin
1362:
1347:
449:
Once satisfied with the post, the core portion is built-up before it is refined to achieve the desired shape
1395:
203:
235:. Alternatively, an impression can be taken of the post space and dental arch using a plastic post and a
1400:
1293:
832:
220:
330:
Traditionally metal posts have been used due to the good corrosion resistance and high yield strength.
676:
511:
Madan, Reshu; Phogat, Shefali; Bhatia, Kriti; Malhotra, Puja; Bhatia, Gauri; Singh, Jobanjeet (2016).
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tissue remaining as they can delaminate upon exposure to moisture and this can lead to post failure.
1390:
389:
159:
87:
1195:"A review of the management of endodontically treated teeth: Post, core and the final restoration"
101:. After the endodontic procedure has been completed, and the root canal(s) is/are filled with the
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In a classic case one of the best designs for a post to decrease the risk of failure is the
232:
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102:
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The post is then seated to the correct length and tested to confirm it resists displacement
1298:
603:
Cheung, William (May 2005). "A review of the management of endodontically treated teeth".
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impression material, and this used to construct a suitable post in the dental laboratory.
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79:
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it should not be too broad as this would lead to lateral perforation and root fracture.
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815:
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75:
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876:. Ricketts, David (David Nigel James), Bartlett, David W. Edinburgh: Elsevier. 2011.
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36:
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513:"A step ahead in post and core technique for patients with limited interarch space"
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The two methods used for making impressions for post and cores are outlined below.
139:
105:
702:"Fracture resistance of teeth restored with cast post and core: An in vitro study"
1222:
995:
978:
647:
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narrowest and longest smooth, parallel post that one can fit into the post space
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The post on the left is a tapered post, the one on the right is a parallel post
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Journal of
International Society of Preventive & Community Dentistry
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Once set the impression should be removed with the post embedded in-situ
182:
700:
Mankar, S; Mohan Kumar, NS; Karunakaran, JV; Kumar, SSenthil (2012).
1238:
31:, which retains a core restoration, which retains the final crown.
1141:(5 ed.). Edinburgh: Butterworth-Heinemann. pp. 271–273.
199:
181:
124:
59:
Sufficient root (radicular) dentine thickness for post preparation
186:
Maxillary posterior teeth restored with prefabricated screw posts
224:
1242:
1027:. Walls, Angus. (9th ed.). Oxford, UK: Blackwell Pub.
247:
Posts can be made from non-metallic materials and metals.
198:
Metal prefabricated post systems are being superseded by
764:"Harty's Endodontics in Clinical Practice - 7th Edition"
351:
Often a metal alloy such as Type IV gold alloy is used.
677:"Fundamentals of Fixed Prosthodontics, Fourth Edition"
787:
Reddy, Harika, Manjula, Chandra, Vengi, Koka (2016).
93:
ProcedurePost and cores divide into two main groups:
1137:
FDS, Thomas R. Pitt Ford PhD BDS, ed. (2003-12-17).
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1373:
1276:
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Finally, an impression is made of the opposing arch
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Gingival retraction as described above is completed
1171:
874:Advanced operative dentistry: a practical approach
56:Curvature and overall anatomy of root canal system
1073:Robinson, Debbie S.; Bird, Doni L. (2016-08-03).
369:post only vs. with additional single-circle ring
983:King Saud University Journal of Dental Sciences
646:Patel, Shanon; Barnes, Justin J. (2013-04-04).
938:Bonsor, Stephen J., Pearson, Gavin J. (2012).
605:The Journal of the American Dental Association
191:into the post space, a core material, such as
109:the depth of softening) The space that exists
1254:
162:is essential when evaluating the tooth for a
8:
1055:: CS1 maint: multiple names: authors list (
962:: CS1 maint: multiple names: authors list (
940:A Clinical Guide to Applied Dental Materials
837:: CS1 maint: multiple names: authors list (
942:. Churchill Livingstone. pp. 211–214.
53:Sufficient length of canal to retain a post
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1199:Journal of the American Dental Association
706:Journal of Pharmacy and Bioallied Sciences
562:Journal of the American Dental Association
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814:
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1139:Harty's Endodontics in Clinical Practice
517:The Saint's International Dental Journal
1076:Essentials of Dental Assisting - E-Book
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1193:Cheung, D.M.D., William (1 May 2005).
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366:smooth-sided vs. serrated vs. threaded
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74:Posts are more commonly required for
66:The benefit of placing a post into a
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1174:Fundamentals of Fixed Prosthodontics
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1178:. Quintessence Publishing Company.
1108:QRS for BDS IV Year, Vol 2 - E Book
14:
1170:Shillingburg, Herbert T. (1979).
1023:F.), McCabe, J. F. (John (2008).
311:leading to a weakened structure.
1211:10.14219/jada.archive.2005.0232
617:10.14219/jada.archive.2005.0232
574:10.14219/jada.archive.2005.0232
149:that exists within surrounding
1:
649:The Principles of Endodontics
390:additional single-circle ring
1111:. Elsevier Health Sciences.
1079:. Elsevier Health Sciences.
996:10.1016/j.ksujds.2011.10.001
1105:Rao, Jyotsna (2017-08-10).
231:or another metal using the
1491:
334:Prefabricated metal posts
50:(coronal tooth structure)
1025:Applied dental materials
806:10.4103/2231-0762.175410
719:10.4103/0975-7406.100200
530:10.4103/2454-3160.202124
243:Materials used for posts
158:. This consideration of
46:Presence of an adequate
1363:Craniofacial prosthesis
306:Glass fibre/ fibreglass
288:Fibre reinforced resins
1396:Maximum intercuspation
904:: CS1 maint: others (
204:vertical root fracture
187:
130:
99:endodontically treated
95:prefabricated and cast
62:Restorability of tooth
1475:Restorative dentistry
1294:Resin-retained bridge
185:
128:
363:parallel vs. tapered
37:fracture at the root
1391:Crown-to-root ratio
1225:on 28 February 2009
403:impression material
160:crown-to-root ratio
1449:Cosmetic dentistry
1411:mutually protected
1406:vertical dimension
1284:Dental restoration
457:Indirect technique
237:polyvinyl siloxane
233:lost-wax technique
188:
178:Prefabricated post
131:
25:dental restoration
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1461:
1454:Dental laboratory
1423:Masticatory force
1358:Ocular prosthesis
1343:Removable Partial
1328:Diagnostic wax-up
1318:Inlays and onlays
164:crown-lengthening
1482:
1386:Centric relation
1270:Prosthodontology
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1221:. Archived from
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193:dental composite
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712:(6): S197–202.
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1205:(5): 611–619.
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652:. OUP Oxford.
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611:(5): 611–619.
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568:(5): 611–619.
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166:procedure.
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1374:Physiology
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1157:0723610894
773:2017-11-15
762:Elsevier.
686:2017-11-15
498:References
68:root canal
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1401:Occlusion
1051:cite book
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728:0975-7406
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