Promjene u svjetlini, zasićenosti i nijansi boje tijekom postupka izbjeljivanja zubi

master's thesis

• Title (english): Changes in brightness, saturation and color nuances during the teeth bleaching process
• Author: Karolina Vrabec
• Mentor: Dubravka Knezović-Zlatarić (mentor)
• Committee member: Dubravka Knezović-Zlatarić (predsjednik povjerenstva)
• Committee member: Robert Ćelić (član povjerenstva)
• Committee member: Maja Žagar (član povjerenstva)
• Granter: University of Zagreb; School of Dental Medicine; (Department of Removable Prosthodontics); Zagreb
• Defense date and country: 2017-09-06, Croatia
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Dental Medicine; Prosthetic Dentistry

Abstract

Suvremena dentalna medicina osim na funkcionalnost, sve više stavlja naglasak na estetiku. Koliko je lijep osmijeh bitna karika u ţivotu svakog pojedinca pokazuju brojna istraţivanja u kojima je nezadovoljstvo bojom zubi pri samom vrhu poimanja vlastite vanjštine. Kako bismo mogli mijenjati postojeću boju zubi, moramo ju najprije definirati. Boja je osjetilni podraţaj koji nastaje pobuĊivanjem fotoreceptora svjetlosnim zrakama na mreţnici oka. Prouĉavanjem boje bavio se profesor Munsell i razloţio ju na tri komponente: nijansu, svjetlinu i zasićenost. Kasnije su uvedeni L*a*b i L*C*h sustavi za detaljniji prikaz sastavnica boja. Boju zubi moţemo odrediti konvencionalno pomoću kljuĉa boja ili digitalno pomoću kolorimetra ili spektrofotometra. Postupci izbjeljivanja zubi dijele se na intenzivno izbjeljivanje u ordinaciji pomoću vodikova peroksida visoke koncentracije te izbjeljivanje udlagama kod kuće pomoću karbamidova ili vodikova peroksida niţih koncentracija. Prednost intenzivnog izbjeljivanja je brzo postignut efekt, no postoje rizici od oštećenja gingive i preosjetljivosti. Prednosti izbjeljivanja udlagama su mala pojavnost preosjetljivosti i dulja postojanost boje, stoga se smatra zlatnim standardom. U ovom radu prikazani su rezultati promjene boje zubi tijekom postupka izbjeljivanja udlagama mjereni spektrofotometrom. Naime, matematiĉkim izraĉunom došlo se do podatka kako se boja zubi u dva tjedna promjenila za 6.48 jedinica, što predstavlja razliku uoĉljivu promatraĉu. Nadalje, svjetlina se povećala, zasićenost smanjila, vrijednosti a* i b* su se pomakle prema hladnim tonovima, a indeks izbjeljivanja pomaknuo se za tri jedinice ulijevo na kljuĉu boja. Navedeni rezultati daju nam do znanja da je boja zubi postala bjelja, što je i bio cilj postupka izbjeljivanja.

Abstract (english)

Contemporary dental medicine, besides functionality, emphasizes aesthetics. The importance of a beautiful smile in life for each individual is shown in many researches in which dissatisfaction with teeth color is at the top of people’s appearance. In order to change the existing teeth color, we must first define it. Color represents sensory stimulus generated by excitation of photoreceptors with light beams on eye mesh. Professor Munsell studied color and divided it into three components: shade, brightness and saturation. L*a*b and L*C*h systems were introduced later for a more detailed representation of color components. The tooth color can be determined conventionally using a shade guide or digitally by a colorimeter or spectrophotometer. Teeth whitening procedures are divided into intensive bleaching in office using high concentration of hydrogen peroxide and bleaching at home using lower concentrations of carbamide or hydrogen peroxide. The advantage of intensive bleaching is a rapidly achieved effect, but there are risks of gingivitis and hypersensitivity. The benefits of splints bleaching include a small occurrence of hypersensitivity and longer lasting color so it is a gold standard. This paper presents the results of change of tooth color during the bleaching process measured by a spectrophotometer. Mathematical calculations showed that teeth color in two weeks changed by 6.48 units, which is the difference visible to observer. Furthermore, brightness increased, saturation decreased, a* and b* values shifted to cold tones, bleaching index shifted for three units to the left on shade guide. The results indicate that tooth color became whiter, which was the goal of bleaching.

• Keywords: estetika; boja zuba; kljuĉ boja; spektrofotometar; izbjeljivanje zubi
• Keywords (english): aesthetics; tooth color; shade guide; spectrophotometer; teeth bleaching
• Language: croatian
• URN:NBN: urn:nbn:hr:127:946648
• 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: 2018-01-16 12:18:23