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Abstract

Introduction:The development of computers and computer supported systems has providedmany opportunities for implementation of modern technologies into everyday dental practice,

with the purpose of reducing human impact on the production of dental restorations and

improving the quality of the final product. Due to their complex geometric shape and high

mechanical and aesthetic requirements, dental restorations require careful and precise

planning, followed by a time-consuming preparation. The use of modern methods for data

acquisition, modeling and machining, tends to shorten the production process as well as to

standardize and improve the quality of dental restorations. The starting phase in the

preparation of dental restorations is obtaining of a working model. Computed tomography

(CT) is a contactless, nondestructive method of 3D digitization. The measurement is

performed by X-rays which penetrate through the object of the analysis, and the information

obtained is further software processed in order to reconstruct a virtual model.

Goal: This study aims to present a method of obtaining of a virtual model of a scanned

acrylate molar.

Matherial and methods:Acrylate molar scan was performed by industrial computedtomography (Carl Zeiss-Metrotom). Further software processing enabled 3D reconstruction

of acrylate molar and a virtual model design.

Results:The virtual model was obtained by industrial CT scan of acrylate molar. Structuraldefects in the form of pinholes were observed on the virtual model. Errors which occurred

during the scan were less than 30 m.

Conclusion:The use of industrial CT proved to be an adequate method of obtaining of avirtual model in dental profession.

Key words: Industrial CT, porosity, virtual model

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Na srpskom sazetak

Uvod:Razvoj raunara i raunarom podranih sistema pruio je mnogobrojne mogunosti

implementacije savremenih tehnologija u svakodnevnu stomatoloku praksu sa ciljem

smanjenja ljudskog uticaja na proizvodnju zubnih nadoknada i poboljanja kvaliteta zavrnog

proizvoda. Zubne nadoknade zbog njihovog sloenog geometrijskog oblika, visokih estetskih

i mehanikih zahteva, iziskuju paljivo i precizno planiranje, praeno vremenski zahtevnom

izradom. Korisenjem savremenih metoda za akviziciju podataka, modeliranja i mainske

obrade, tei se skraenju procesa proizvodnje uz standardizaciju i unapreenje kvaliteta

zubnih nadoknada. Polazna faza pri izradi zubnih nadoknada je dobijanje radnog modela.

Kompjuterizovana tomografija (CT) je beskontaktna, nedestruktivna metoda 3D

digitalizacije. Merenje se vri prodornim X zracima koji prolaze kroz ispitivani objekat, a

dobijene informacije se daljom softverskom obradom rekonstruiu u virtuelni model.

Cilj istraivanja je prikaz metode dobijanja virtuelnog modela skeniranog akrilatnog

kutnjaka.

Materijal i metode: Skeniranje akrilatnog kutnjaka obavljeno je industrijskom

kompjuterizovanom tomografijom (Carl Zeiss- Metrotom). Daljom softverskom obradom

napravljena je 3D rekonstrukcija akrilatnog kutnjaka i napravljen je virtuelni model.

Rezultati: Skeniranjem akrilatnog kutnjaka industrijskim CT-om dobijen je virtuelni model.

Na virtuelnom modelu se zapaa strukturni defekt u vidu poroznosti. Tokom skeniranja javile

su se greke koje su bile manje od 30 m.

Zakljuak: Upotreba industrijskog CT pokazala se kao adekvatan metod za dobijanje

virtuelnih modela u stomatoloskoj struci.

Kljune rei: Industrijski CT, poroznost, virtuelni model

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