Sustavi za ocjenjivanje dentalnih otisaka

master's thesis

• Title (english): Systems for evaluation of dental impressions
• Author: Ivana Najman
• Mentor: Davor Illeš (mentor)
• Committee member: Davor Illeš (predsjednik povjerenstva)
• Committee member: Iva Alajbeg (član povjerenstva)
• Committee member: Dubravka Knezović-Zlatarić (član povjerenstva)
• Granter: University of Zagreb; School of Dental Medicine; (Department of Removable Prosthodontics); Zagreb
• Defense date and country: 2017-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Dental Medicine; Prosthetic Dentistry

Abstract

U praksi otisci se ocjenjuju vizualnom metodom, na temelju iskustva terapeuta, dok se u istraţivanjima koriste konvencionalne i u novije vrijeme digitalne metode ocjenjivanja otisaka. Istraţivanja se provode u in vivo i in vitro uvjetima.
Konvencionalne metode ocjenjivanja otiska su uglavnom dvodimenzionalne metode u kojima se procjenjuje linearna preciznost tako što se različitim ureĎajima za mjerenje, mjeri udaljenost izmeĎu proizvoljno odabranih točaka s ciljem dokazivanja ekspanzije ili kontrakcije materijala.
Razvojem tehnologije, povećana je preciznost 2D (dvodimenzionalni sustav) mjerenja te je omogućena trodimenzionalna digitalna analiza otisaka, intraoralnih skenova ili izlivenih modela optičkim skenerima ili radiografskim metodama usporedbom dijelova ili cijele površine otiska. Kod digitalnih metoda mjerenja preciznosti, najprije je potrebno otisak, model ili čeljust skenirati. Nakon toga se datoteke u STL formatu, obraĎuju u različitim programskim paketima. Moguća su 2D linearna i angularna mjerenja te usporedba površina pri čemu se modeli mogu superponirati ili se moţe usporediti “hrapavost” površina otisaka. Omogućeno je prikazivanje deformacija u sve tri koordinatne osi. Osim intraoralnih i laboratorijskih skenera u istraţivanjima se koriste i radiografski ureĎaji, CT i CBCT.
Digitalne i radiografske metode otiskivanja, ubrzano se razvijaju te je preciznost i točnost takvih sustava sve veća čime postaju konkurentni konvencionalnim načinima otiskivanja. Način i upotreba sustava za ocjenjivanje otisaka su limitirani. Oni ovise o mogućnostima terapeuta ili istraţivača, opremljenosti ordinacije ili laboratorija, odnosno dostupnosti različitih metoda ocjenjivanja. Limitirajući faktor je i cijena. U istraţivanjima izbor sustava i metoda za ocjenjivanje otisaka ovisi o potrebama istraţivanja, o njihovim ciljevima i svrsi.

Abstract (english)

In practice impressions are evaluated by visual method based on experience of the therapist, whilst by doing researches conventional and, in recent times, digital methods are used for it. Researches are done in in vivo and in vitro conditions.
Conventional methods of evaluating impressions are mostly two-dimensional. Linear precision is estimated by measuring distance between arbitrarily chosen dots with goal of proving expansion or contraction of material with various measuring aids.
With technology development, the precision of 2D measuring is increased and analysis of three-dimensional digital impression, inter-oral scans or cast models with digital methods of comparison parts or whole impression surface is enabled. The impression/model/jaw need to be scanned, then files in STL format are processed in different program packages. 2D linear and angular measurements are possible and the surface comparison too. The models can be superimposed or “roughness” of impression surfaces can be compared. Display of deformations is enabled in all three of coordinate axes. Except inter-oral and laboratory scanners, in researches radiographic devices are used too, CT and CBCT.
Digital impression methods are developing rapidly and precision and punctuality of such systems is increasing with which they are becoming a competition to conventional ways of making impressions. Method and use of systems for impression evaluation are limited. They depend on therapist’s or researcher’s possibilities, equipment of ordination or laboratory, availability of different evaluation methods and also the price. In researches, choice of systems and methods for impression evaluation depend on the goals and purpose of the research.

• Keywords: Ocjenjivanje dentalnih otisaka; konvencionalne metode ocjenjivanja otisaka; digitalne metode ocjenjivanja otisaka
• Keywords (english): Dental impression evaluation; conventional methods of dental impression evaluation; digital methods of impression evaluation
• Language: croatian
• URN:NBN: urn:nbn:hr:127:137517
• Study programme: Title: dental medicine; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: doktor/doktorica dentalne medicine (doktor/doktorica dentalne medicine)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2017-08-30 10:14:22