Sustav za mjerenje i analizu elektrokemijskih svojstava dentalnih implantata

master's thesis

• Title (english): System for Measurement and Analysis of Electrochemical Behaviour of Dental Implants
• Author: Tomislav Kovačević
• Mentor: Mario Cifrek (mentor)
• Committee member: Mario Cifrek (predsjednik povjerenstva)
• Committee member: Igor Krois (član povjerenstva)
• Committee member: Hrvoje Džapo (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2018-07-06, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Biokompatibilnost materijala bitna je stavka u oseointegraciji dentalnih implantata. Uz dobre mehaničke osobine i visoku otpornost na koroziju, titan je gotovo idealan metal za implantološku uporabu. No, zbog promjene fizikalnih parametara usne šupljine (pH, temperatura, sastav sline itd.) te pojava elektrokemijskih učinaka prilikom ugradnje, dolazi do narušavanja pasivizacijskog sloja titana i nastanka korozije. Korozija sprječava resorpciju kosti, mekih tkiva te u konačnici vodi do neuspjeha oseointegracije. Kako bi se elektrokemijski učinci detektirali i smanjili, projektiran je i realiziran sustav u programskom alatu Altium Designer. Napon nastao uslijed elektrokemijskih učinaka istosmjerni je, u rasponu ±1 V, te su na njega superponirane smetnje. S namjerom smanjenja učinka smetnji i mjerenja samo korisnog signala, koriste se pojačala spojena u kaskadu. Dijelovi kaskade su: RFI filtar, auto-zero pojačalo, međuspremnik, niskopropusni filtar, programabilno pojačalo, nakon čega slijedi analogno-digitalna pretvorba i konačno prijenos uzorkovanih podataka preko STM32F429 razvojnog sustava u MATLAB programsko okruženje u kojem se podatci mogu vizualizirati i dodatno obrađivati.

Abstract (english)

Biocompatibility of materials is an essential element in the osseointegration of dental implants. Good mechanical properties and high corrosion resistance, titanium is almost an ideal metal for dental implants. However, due to changes in the physical parameters of the oral cavity (pH, temperature, composition of saliva, etc.) and electrochemical effects occured during implantation, the passivation layer of titanium is compromised, corrosion appearance. Corrosion prevents both, bone and soft tissues resorption and ultimately leads to a failure of osseointegration. In order to detect and reduce the electrochemical effects, a system has been designed and implemented in Altium Designer software. The voltage generated by the electrochemical effects is DC, in the range of ±1 V, and superficial disturbances are superimposed on it. With the intent of reducing the impact of disturbances and measuring only the useful signal, amplifiers are connected to the cascade. The components of the cascade are: RFI filter, auto-zero amplifier, buffer, low pass filter, programmable amplifier, followed by analog-to-digital conversion and final transmission of sampled data via the STM32F429 development system into the MATLAB programming environment where the data can be visualized and further processed.

• Keywords: dentalni implantati; elektrokemijska svojstva; biopotencijali; korozija; pasivnost titana; mjerni sustav; analogno pojačalo; analogno-digitalna pretvorba; STM32F429
• Keywords (english): dental implants; electrochemical properties; biopotentials; corrosion; titanium passivity; measurement system; analogue amplifier; analogue-to-digital conversion; STM32F429
• Language: croatian
• URN:NBN: urn:nbn:hr:168:507193
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-03-13 21:51:27