Cox proportional hazard model and its application to data analysis of failure of endodontic equipment

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00159816%3A_____%2F17%3A00067626" target="_blank" >RIV/00159816:_____/17:00067626 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/17:00095503 RIV/00216208:11110/17:10374530

Result on the web

<a href="http://dx.doi.org/10.5507/bp.2016.063" target="_blank" >http://dx.doi.org/10.5507/bp.2016.063</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5507/bp.2016.063" target="_blank" >10.5507/bp.2016.063</a>

Result language

angličtina

Original language name

Cox proportional hazard model and its application to data analysis of failure of endodontic equipment

Original language description

Background and Aims. A very common statistical method used in statistical analysis of medical data is the Cox proportional hazard model (Cox model). The aim of this paper is to describe statistical data analysis as a process beginning with data management, followed by statistical coding and statistical analysis, including survival analysis and the Cox model, and finishing with the interpretation of results. The methods are applied to the data from stomatology - the influence of selected variables on the fracture of endodontic equipment. Statistical analyses were performed in R. Methods. Exploratory analysis and visualization methods are firstly presented. The survival analysis methods of KaplanMeier&apos;s product limit estimate, estimate of the cumulative hazard function, and Nair&apos;s 95% confidence bands are then calculated. Finally, the conditional hazard is modelled with the Cox model where regression parameters are tested with the Wald test and the proportionality of hazard with the Schoenfeld test. Results. In the Cox model, covariates influencing the fracture of endodontic equipment, the radius of the dental canal, the size and brand of the endodontic equipment (Mtwo, ProTaper, Revo-S, and Wizard Navigator) were used. The regression parameters of the radius of the dental canal and endodontic equipment size proved to be statistically significant. Compared to the reference brand Mtwo endodontic equipment, the regression parameters of the ProTaper and Revo-S drills proved to be statistically significant. Conclusions. Fracturing endodontic equipment during a root canal treatment often leads to undesirable resting of the tool in the root canal of the patient&apos;s tooth, which can lead to less successful endodontic treatment and thus less satisfactory prognosis.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20602 - Medical laboratory technology (including laboratory samples analysis; diagnostic technologies) (Biomaterials to be 2.9 [physical characteristics of living material as related to medical implants, devices, sensors])

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

BIOMEDICAL PAPERS-OLOMOUC

ISSN

1213-8118

e-ISSN

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Volume of the periodical

161

Issue of the periodical within the volume

S1

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

11

Pages from-to

"S1"-"S11"

UT code for WoS article

000428945000001

EID of the result in the Scopus database

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