The Nankali post system is a

post and core A post and core crown is a type of dental restoration required where there is an inadequate amount of sound tooth tissue remaining to retain a conventional crown. A post is cemented into a prepared root canal, which retains a core restoration, which ...

s prosthesis, which is used in

prosthodontology Prosthodontics, also known as dental prosthetics or prosthetic dentistry, is the area of dentistry that focuses on dental prostheses. It is one of 12 dental specialties recognized by the American Dental Association (ADA), Royal College of Surgeo ...

and

dental restoration Dental restoration, dental fillings, or simply fillings are treatments used to restore the function, integrity, and morphology of missing tooth structure resulting from caries or external trauma as well as to the replacement of such structure sup ...

. This post and core consists of a single ''smooth'' or ''serrated post'' and core which has an additional ''circle ring'' (counter sink) around it. The additional single-circle ring increases the contact surface area between the core and involved part of tooth significantly. Increased contact surface area decreases the

pressure Pressure (symbol: ''p'' or ''P'') is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled ''gage'' pressure)The preferred spelling varies by country and e ...

between the two objects (remaining part of the tooth and post-core) and is followed by ''a declining in the number of failures'' in treatments.Nankali A.(2006)Usage the New Post System with Insertion Ring, Soveremenaia Stomatologia Journal/ Kyiv, Ukraine 2(34) 2006, p142-144

General indications

The main indications are: *Severely damaged crown *

Trauma Trauma most often refers to: * Major trauma, in physical medicine, severe physical injury caused by an external source * Psychological trauma, a type of damage to the psyche that occurs as a result of a severely distressing event *Traumatic i ...

*Tooth wear (

erosion Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distin ...

) *

Hypoplastic Hypoplasia (from Ancient Greek :wikt:ὑπό, ὑπo- ''hypo-'' 'under' + πλάσις ''plasis'' 'formation'; adjective form ''hypoplastic'') is underdevelopment or incomplete development of a tissue or organ.restoration Restoration is the act of restoring something to its original state and may refer to: * Conservation and restoration of cultural heritage ** Audio restoration ** Film restoration ** Image restoration ** Textile restoration * Restoration ecology ...

*Combined indication *Non-vital teeth

Disadvantages

The disadvantages are as follows: * Requires an exact casting ( an exact cast post-core is required to get the highest result, particularly, when the depth of prepared canal is less than ''50% of the root length''), * A specific

bur A bur (also spelled burr) is a seed or dry fruit or infructescence that has hooks or teeth. The main function of the bur is to spread the seeds of the bur plant, often through epizoochory. The hooks of the bur are used to catch on to for exam ...

is required, * Increases plaque accumulation and changes in composition,Abolmasov N.G., Abolmasov N.N., Bichkov B.A., Alkhakim A. (2003). Orthopedicheskaia Stomatalogia. Moscow / Medpress-inform, , p187-201 * Damage to soft tissues and remaining teeth, due to either poor denture design or lack of patient care,

Fractured teeth

The post is suitable for those types of fractures in which the

fracture Fracture is the separation of an object or material into two or more pieces under the action of stress. The fracture of a solid usually occurs due to the development of certain displacement discontinuity surfaces within the solid. If a displa ...

line passes apical to the

crown A crown is a traditional form of head adornment, or hat, worn by monarchs as a symbol of their power and dignity. A crown is often, by extension, a symbol of the monarch's government or items endorsed by it. The word itself is used, partic ...

. In the first stage it is necessary to examine the patient in order to be sure that there is no sign of any fracture in the

mandible In anatomy, the mandible, lower jaw or jawbone is the largest, strongest and lowest bone in the human facial skeleton. It forms the lower jaw and holds the lower tooth, teeth in place. The mandible sits beneath the maxilla. It is the only movabl ...

maxilla The maxilla (plural: ''maxillae'' ) in vertebrates is the upper fixed (not fixed in Neopterygii) bone of the jaw formed from the fusion of two maxillary bones. In humans, the upper jaw includes the hard palate in the front of the mouth. The t ...

, then analyse the possibility of treatment of the fractured tooth canal. In addition, the condition of the tooth for using the bur requires to be checked as well.

Bur

The designed bur for treating teeth is a bur consisting of ''a central guider'' and two

symmetrical Symmetry (from grc, συμμετρία "agreement in dimensions, due proportion, arrangement") in everyday language refers to a sense of harmonious and beautiful proportion and balance. In mathematics, "symmetry" has a more precise definiti ...

cutter to produce a single-circle ring. This bur is used after preparation of the root canal similar to other posts. The two main ''advantages'' of this bore are

speed In everyday use and in kinematics, the speed (commonly referred to as ''v'') of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quanti ...

in preparation root canals and its

accuracy Accuracy and precision are two measures of ''observational error''. ''Accuracy'' is how close a given set of measurements (observations or readings) are to their ''true value'', while ''precision'' is how close the measurements are to each other ...

. The bur is designed in ''different sizes'', which make it available for using in treatment of various teeth. The depth of the prepared ring is in direct proportion with the size of bore.Makhnitski M.B.(1999) The New Post System. Young Scientists and Students–Scientific Medical Seminar review in 1999. Ministry of Health of Ukraine and National Medical University / thesis, 20-23 Kvitnia, Kyiv, Ukraine – 1999, p61 One of the major problems of using this post system is its bur, which means without having the bur it is impossible to use it.

History

The Nankali-post was designed in 1997 in the National Medical University at the

Orthopedic Orthopedic surgery or orthopedics ( alternatively spelt orthopaedics), is the branch of surgery concerned with conditions involving the musculoskeletal system. Orthopedic surgeons use both surgical and nonsurgical means to treat musculoskeletal ...

and Implant Stomatology Department by Dr. Ali Nankali, which (October 1999) verified by Scientific Board of

Bogomolets National Medical University Bogomolets National Medical University (NMU) is a medical school founded in 1841 in Kyiv, Russian Empire by the Russian Tsar Nicolas I. The university is named after physiologist Alexander A. Bogomolets. NMU provides medical training for over 10, ...

and international patent organization (УДК; 616.314-76-77:616.314.11-74:678.029.46:612.311) in Kyiv/Ukraine. Initially it was presented at the 54Th Medical Science Conference of Students & Young Scientists in 1999, that was organized by Ukraine Health Ministry and National Medical University known as O.O. Bogomolets and Society Science Students known as O.O. Kisilia. The result of presentation was published in "Young Scientists and Students / Scientific Medical Seminar in 1999". In 1999 it was requested for the patent (УДК; 616.314-76-77:616.314.11-74:678.029.46:612.311)and became a part of research of the Orthopedic and Implant Stomatology Department of the National Medical University. This new modified post-core was under study till 2004 and then attested by the Dental Scientific Board of Ukraine. During the four years of careful observation (2000-2004 / National Medical University in

Kyiv Kyiv, also spelled Kiev, is the capital and most populous city of Ukraine. It is in north-central Ukraine along the Dnieper, Dnieper River. As of 1 January 2021, its population was 2,962,180, making Kyiv the List of European cities by populat ...

), the number of reported complication from patient, whom were treated with the Nankali-post was none. Initially the bur and cast post-core were manufactured in the laboratory of the Orthopedic and Implant Stomatology Department of the National Medical University (O.O.Bogomolets) in Kyiv.

Notes

References

* Makhnitski M.B.(1999) The New Post System. Young Scientists and Students–Scientific Medical Seminar review in 1999. Ministry of Health of Ukraine and National Medical University / thesis, 20-23 Kvitnia, Kyiv, Ukraine – 1999, p61 *Nankali A. (2002), Strength Properties Investigation of the hard tissue of the teeth root, Ukrainian Medical Young Scientists Journal,National Medical University, No3-4, Page 74-76. *Nespriadco V.P.(2004) Naukovi SVIT / Official publication of Supreme Attestation Commission of Ukraine, No. 3 Verezen, 2004 – p20, *Juliev. E.N.(Жулев Е.Н.)(2000) Fixed prosthetics (Несъемные протезы) / НГМА - Nijnegorodskoi Gosudarstveni Medisinskoi Akademi /Н. Новгород - Novogorad, , p280-296 *Nankali A.(2003), A new type of pin post-system with ring insertion – construction, mechanical & mathematical properties, Sovremenaia Stomatologia Journal / Kyiv, Ukraine, 1(21)2003, p114-117 *Abolmasov N.G., Abolmasov N.N., Bichkov B.A., Alkhakim A. (2003). Orthopedicheskaia Stomatalogia. Moscow / Medpress-inform, , p187-201 *Nankali A.(2003) A new kind of pin post-system with ring insertion – use in clinical treatment, Ukrainski Stomatology Almanakh, Poltava, Ukraine, No.3, p33-36 *Nankali A.(2006)Usage the New Post System with Insertion Ring, Soveremenaia Stomatologia Journal/ Kyiv, Ukraine 2(34) 2006, p142-144 *Nankali A.(2000), the peculiarity of chewing pressure distribution in post system. - Manuscription, Naukovi SVIT, DK-No-249 16.11.2000/ P16 *Mitchell D.A, MITCHELL L. (2006–2007), Oxford Handbook of Clinical Dentistry / Oxford University Press / 4Ed., , p288, p336 {{Prosthodontology Restorative dentistry Prosthodontology