Učinkovitost fotodinamske terapije diodnim laserom valne duljine 445nm i otopine riboflavina na biofilm mikroorganizama na površini dentalnih implantata

doctoral thesis

• Title (english): Effect of antimicrobial photodynamic therapy with diode laser of 445nm wavelength and riboflavin dye on microorganisms' biofilm on dental implant surface
• Author: Luka Morelato
• Mentor: Dragana Gabrić (mentor)
• Mentor: Ana Budimir (komentor)
• Committee member: Vlaho Brailo (predsjednik povjerenstva)
• Committee member: Ana Badovinac (član povjerenstva)
• Committee member: Nataša Beader (član povjerenstva)
• Granter: University of Zagreb; School of Dental Medicine; Zagreb
• Defense date and country: 2023-09-13, Croatia
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Dental Medicine; Oral Surgery
• Universal decimal classification (UDC): 616.31 - Stomatology

Abstract

Cilj istraživanja bio je utvrditi učinak antimikrobne fotodinamske terapije (PDT) 0,1% riboflavinom kao fotosenzitizirajućim sredstvom aktiviranim diodnim laserom valne duljine 445 nm na biofilm Staphylococcus aureus i Candida albicans na površini dentalnih implantata te usporediti s učinkom fotodinamske terapije 0,1% metilenskim modrilom kao fotosenzitizirajućim sredstvom aktiviranim diodnim laserom valne duljine 660 nm i učinkom 0,2% klorheksidina. Istraživanje je provedeno na 80 dentalnih implantata kontaminiranih biofilmom Staphylococcus aureus i Candida albicans, nasumično podijeljenih u 4 skupine od 20 implantata u svakoj skupini. Negativna kontrolna skupina (NC) je ostavljena bez tretmana površine, pozitivna kontrolna skupina (PC) tretirana je 0,2% otopinom klorheksidina, ispitivana fotodinamska skupina (PDT1) tretirana je 0,1% riboflavinom kao fotosenzitizirajućim sredstvom aktiviranim diodnim laserom valne duljine 445 nm, druga fotodinamska skupina tretirana je 0,1% metilenskim modrilom kao fotosenzitizirajućim sredstvom aktiviranim diodnim laserom valne duljine 660 nm (PDT2). Usporedbom dobivenih rezultata utvrđeno je da je novi fotodinamski protokol dezinfekcije površine implantata diodnim laserom valne duljine 445nm i otopine 0,1% riboflavina usporediv s postojećim protokolima dezinfekcije površine implantata otopinom 0,2% klorheksidinom, kao i diodnim laserom valne duljine 660 nm i 0,1% otopinom metilenskog modrila. Zaključeno je da ispitivani protokol može postaviti temelj daljnjim kliničkim istraživanjima i početku upotrebe nove valne duljine plavoga spektra svjetlosti u kombinaciji s novim fotosenzibilizirajućim sredstvom u kliničkoj praksi.

Abstract (english)

Aim: The occurrence of peri-implantitis was observed with the beginning of the placement of the first dental implants. With the increase in the number of dental implants, the frequency of complications in clinical practice, in the form of peri-implant diseases, has also increased. Antimicrobial photodynamic therapy (PDT) was introduced as a potential periimplantitis
treatment option. The aim of the study was to determine the effect of the new antimicrobial photodynamic therapy (PDT) with the novel diode laser light (SiroLase Blue; Dentsply Sirona; Germany) of 445 nm wavelength in combination with the 0.1% riboflavin solution as a photosensitizing agent on the Staphylococcus aureus and Candida albicans biofilm on the
surface of dental implants, and compare it with the effect of PDT with methylene blue 0.1% photosensitizing agent activated by diode laser with a wavelength of 660 nm and the effect of the often used 0.2% chlorhexidine solution.
Methods: In the study 80 dental implants contaminated with Staphylococcus aureus and Candida albicans biofilm was used, randomly divided into 4 groups of 20 implants in each one. The implants were removed from the bacterial–fungal suspension using a sterile forceps, gently dried with sterile gauze to remove the excess bacterial and fungal solution and placed on sterile silicone holders. The negative control group (NC) was left without surface treatment. The positive control group (PC) was treated with a sterile cotton pellet soaked in a 0.2% chlorhexidine-based solution for 60 s using a brushing movement. The examined group was treated with 0.1% riboflavin dye and then radiated with a diode laser at 445 nm (Q power = 100 mW) in the pulsed mode of 100 Hz using an EasyTip 320 µm, with the max power density of 124.34 W/cm2 and energy density of 1.24 J/cm2, for 60 s moving in circles at approximately 1 mm from the implant surface. The second PDT group (PDT2) was treated using a similar procedure, with 0.1% methylene blue as a photosensitizing agent activated by a diode laser with a wavelength of 660 nm (Q power = 100 mW), in continuous-wave mode using an EasyTip 320
µm, with the max power density of 124.34 W/cm2 and max energy density of 1240 J/cm2, for 60 s moving in circles at approximately 1 mm from the implant surface.
Results: PDT1 and PDT2 group showed greater reduction of Staphylococcus aureus and Candida albicans compared to NC group, and no significant difference compared to PC group. PDT1 and PDT2 groups compared showed no significant difference in disinfection of Staphylococcus aureus and Candida albicans microorganisms’ biofilm on dental implant surface.
Conclusions: Analyzing the obtained results, it was determined that the new photodynamic protocol for disinfection of the implant surface with a diode laser of wavelength 445 nm and a 0.1% riboflavin solution is comparable to the existing protocols for disinfection of the implant surface with a solution of 0.2% chlorhexidine, as well as with a diode laser of wavelength 660 nm and 0, 1% methylene blue solution. It was concluded that the investigated protocol can lay the foundation for further clinical research and the beginning of use of a new wavelength of the blue light spectrum in combination with a new photosensitizing agent in clinical practice.

• Keywords: zubni implantati; periimplantitis; laseri poluvodiči; fotokemoterapija
• Keywords (english): Dental Implants; Peri-Implantitis; Lasers Semiconductor; Photochemotherapy
• Language: croatian
• URN:NBN: urn:nbn:hr:127:106485
• Promotion: 2023
• Study programme: Title: dental medicine; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica znanosti, područje biomedicine i zdravstvo, polje dentalna medicina (doktor/doktorica znanosti, područje biomedicine i zdravstvo, polje dentalna medicina)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-09-19 07:46:45