Accuracy of optical scanning methods of the Cerec®3D system in the process of making ceramic inlays

Abstract

Background/Aim. One of the results of many years of Cerec® 3D CAD/CAM system technological development is implementation of one intraoral and two extraoral optical scanning methods which, depending on the current indications, are applied in making fixed restorations. The aim of this study was to determine the degree of precision of optical scanning methods by the use of the Cerec®3D CAD/CAM system in the process of making ceramic inlays. Methods. The study was conducted in three experimental groups of inlays prepared using the procedure of three methods of scanning Cerec ®3D system. Ceramic inlays made by conventional methodology were the control group. The accuracy of optical scanning methods of the Cerec®3D system computer aided designcomputer aided manufacturing (CAD/CAM) was indirectly examined by measuring a marginal gap size between inlays and demarcation preparation by scanning electron microscope (SEM). Results. The results of the study showed a difference in the accuracy of the existing methods of scanning dental CAD/CAM systems. The highest level of accuracy was achieved by the extraoral optical superficial scanning technique. The value of marginal gap size inlays made with the technique of extraoral optical superficial scanning was 32.97 ± 13.17 μ. Techniques of intraoral optical superficial and extraoral point laser scanning showed a lower level of accuracy (40.29 ± 21.46 μ for inlays of intraoral optical superficial scanning and 99.67 ± 37.25 μ for inlays of extraoral point laser scanning). Conclusion. Optical scanning methods in dental CAM/CAM technologies are precise methods of digitizing the spatial models; application of extraoral optical scanning methods provides the hightest precision.

Uvod/Cilj. Jedan od rezultata dugogodišnjeg tehnološkog usavršavanja Cerec®3D sistema jeste implementacija jednog intraoralnog i dva ekstraoralna metoda optičkog skeniranja koji se, u zavisnosti od postojeće indikacije, primenjuju u izradi fiksnih nadoknada. Cilj rada bio je da se utvrdi stepen preciznosti optičkih metoda skeniranja Cerec®3D sistema u postupku izrade keramičkih inleja. Metode. Ispitivanje je sprovedeno u okviru tri eksperimentalne grupe inleja u čijoj izradi su primenjena tri postupka skeniranja Cerec®3D sistema. Keramički inleji izrađeni konvencionalnom metodologijom predstavljali su kontrolnu grupu. Preciznost optičkih metoda skeniranja Cerec®3D sistema ispitivana je indirektno, merenjem veličine rubnog zaptivanja između inleja i demarkacije preparacije pomoću skenirajućeg elektronskog mikroskopa (SEM). Rezultati. Istraživanjem je ustanovljeno da postoji razlika u preciznosti postojećih metoda skeniranja stomatoloških Computer aided design-computer aided manufacturing (CAD/CAM) tehnologija. Najviši stepen preciznosti pokazala je tehnika optičkog ekstraoralnog površinskog skeniranja. Vrednost rubnog zaptivanja inleja izrađenih primenom ove tehnike iznosila je 32,97 ± 13,17 μ. Tehnike intraoralnog optičkog površinskog i ekstraoralnog tačkastog skeniranja pokazuju niži nivo preciznosti (40,29 ± 21,46 μ za inleje intraoralnog optičkog površinskog i 99,67 ± 37,25 μ za inleje ekstraoralnog tačkastog skeniranja). Zaključak. Optičke metode skeniranja u stomatološkim CAD/CAM tehnologijama predstavljaju precizne metode prostorne digitalizacije modela; pri tom, najveću preciznost pruža primena ekstraoralnih optičkih metoda skeniranja.