Napredak u metalurgiji i proizvodnji endodontskih instrumenata

master's thesis

• Title (english): Progress in metallurgy and production of endodontic instruments
• Author: Sara Maraš Žilić
• Mentor: Ana Ivanišević (mentor)
• Committee member: Nada Galić (član povjerenstva)
• Committee member: Anja Ivica (član povjerenstva)
• Granter: University of Zagreb; School of Dental Medicine; (Department of Endodontics and Restorative Dentistry); Zagreb
• Defense date and country: 2024-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Dental Medicine

Abstract

Endodontski terapijski postupak uključuje kemo-mehaničku obradu korijenskog kanala čime se uklanjanju mikroorganizami i ostaci tkiva i priprema prostor za kvalitetno brtvljenje. Uvođenje nikal titanske legure u proizvodnju endodontskih instrumenata omogućilo je razvoj strojnih sustava i značajno unaprijedilo mehaničku obradu kanala. Zahvaljujući austenitnoj i martenzitnoj fazi, nikal titanska legura posjeduje svojstvo superelastičnosti i fleksibilnosti te efekt pamćenja oblika. Uporaba nikal titanskih strojnih sustava značajno skraćuje vrijeme obrade kanala, a incidencija proceduralnih pogrešaka prilikom instrumentacije zakrivljenih i anatomski zahtjevnih korijenskih kanala (transportacija, stvaranje stepenice, perforacija stijenke kanala) manja je nego kod instrumentacije instrumentima od nehrđajućeg čelika. Nedostatak konvencionalnih strojnih nikal titanskih instrumenata je povećana incidencija loma u odnosu na ručne instrumente od nehrđajućeg čelika zbog cikličkog zamora i torzijskog opterećenja. S ciljem povećanja otpornosti na ciklički zamor i torzijsko opterećenje nikal titanskih instrumenata, razvijaju se novi proizvodni postupci koji uključuju elektropoliranje, termomehaničku obradu te različite/promjenjive konicitete i poprečne presjeke instrumenata. Stoga je važno poznavati metalurgiju i dizajn strojnih endoodntskih instrumenata jer oni determiniraju mehanička svojstva instrumenata. Poznavanje sastava legure (prvenstveno udjela martenzitne faze na tjelesnoj temperaturi), poprečnog presjeka i koniciteta, omogućava individualizaciju liječenja uz uvažavanje anatomskih specifičnosti i minimiziranje proceduralnih pogrešaka.

Abstract (english)

The endodontic therapeutic procedure includes chemo-mechanical treatment of the root canal, which removes microorganisms and tissue remnants and prepares the space for quality sealing. The introduction of nickel-titanium alloy in the production of endodontic instruments enabled the development of machine systems and significantly improved the mechanical treatment of canals. Thanks to the austenite and martensite phase, the nickel titanium alloy possesses the property of superelasticity and flexibility and the shape memory effect. The use of nickel-titanium machine systems significantly shortens the time of canal treatment, and the incidence of procedural errors during the instrumentation of curved and anatomically demanding root canals (transportation, creation of a step, perforation of the canal wall) is lower than in the case of instrumentation with stainless steel instruments. A disadvantage of conventional machined nickel-titanium instruments is the increased incidence of fracture compared to stainless steel hand instruments due to cyclic fatigue and torsional loading. With the aim of increasing the resistance to cyclic fatigue and torsional loading of nickel-titanium instruments, new manufacturing processes are being developed that include electropolishing, thermomechanical treatment and different/variable conicities and cross-sections of instruments. Therefore, it is important to know the metallurgy and design of mechanical endodontic instruments because they determine the mechanical properties of the instruments. Knowing the composition of the alloy (primarily the proportion of the martensitic phase at body temperature), the cross-section and conicity, enables the individualization of the treatment while respecting anatomical specificities and minimizing procedural errors.

• Keywords: endodoncija; obrada korijenskog kanala; stomatološki instrumenti; titanij; nikal; stomatološke legure; ustenit; legure s pamćenjem oblika; martenzit; superelastičnost; termomehanička obrada
• Keywords (english): Endodontics; Root Canal Preparation; Dental Instruments; Titanium; Nickel; Dental Alloys; Shape Memory Alloys; Martensite; Superelasticity; Thermomechanical Processing
• Language: croatian
• URN:NBN: urn:nbn:hr:127:345389
• Study programme: Title: Integrated undergraduate and graduate university study of 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: 2024-09-23 21:45:02