MİKROKRİSTALİN SELÜLOZ İÇEREN DENTAL KOMPOZİT REÇİNELERİN MEKANİK VE RENK ÖZELLİKLERİNİN İNCELENMESİ

OZ Amac: Mikrokristalin selulozun (MKS), dental recine formulasyonu icerisinde kullanildiginda egilme gerilimi ve mikro sertlik gibi mekanik ozellikleri ve renk degisimi uzerindeki etkisini incelemektir. Gerec ve Yontem: Dental kompozit recine gruplarinda tasiyici sistem olarak Bisfenol A glisidil metakrilat, trietilenglikol dimetakrilat, monomerleri kullanilmistir. Foto-baslatici olarak kamforokinon ve yardimci baslatici olarak ise 2-dimetilaminoetilmetakrilattercih edilmistir. Dolgu malzemesi olarak MKS farkli oranlarda karisimi kullanilmistir. Kompozit recinelerin egilme gerilimi testi hem tasarlanan gruplar arasinda hem de ticari urun ile islak ve kuru olarak kiyaslanmistir. Bulgular: Elde edilen sonuclara gore gelistirilen kompozit recinelerde MKS orani artmasina ragmen egilme geriliminde onemli bir degisiklik gozlenmemekte ve ticari urune gore daha zayif mekanik ozellige sahip oldugu belirlenmektedir. Bu degerler tasarlanan kompozit recineler icin: 35.31, 35.50, 39.85 MPa ticari urun icin ise 78.8MPa olarak belirlenmistir. Ornekler icin yapilan mikrosertlik sonuclarina gore ise MKS oraninin artmasiyla orneklerin mikro sertliginin de artmis oldugu gozlenmektedir. Su, kola, cay ve kahve iceceklerinde bekletilen ornekler icerdikleri MKS oranina gore degerlendirilmis olup, en fazla renk degisiminin %20 MKS iceren ornegin 1 hafta suresince kahve icerisinde bekletilmesiyle elde edildigi gozlenmistir. Sonuc: Dental kompozit recine sisteminde kullanilan MKS oraninin artmasi orneklerin egilme gerilimi ozelliklerinde bir artisa neden olmazken mikrosertlik degerlerinde ve renk degisimlerinde onemli miktarda artisa sebep olmustur. Anahtar Kelimeler: Mikrokristalin seluloz, dental kompozit recine, mikrosertlik, egilme gerilimi, renk degisimi. Investigation of the Mechanical and Color Characteristics of Microcrystalline Cellulose Containing Dental Composite Resins ABSTRACT Objective: The aim of this study is to investigate the effect of microcrystalline cellulose (MCC) on mechanical properties such as bending stress and micro hardness when used in dental resin formulation and its effect on color change. Materials and Methods: Bisphenol A glycidyl methacrylate, triethyleneglycol dimethacrylate monomers were used as carrier system in dental composite resin groups. Camphorquinone was preferred as the photoinitiator and 2-dimethylaminoethylmethacrylate as the co-initiator. Mixture of MCC in different proportions was used as filling material. The flexural stress test of the composite resins was compared between the designed groups and the commercial product. Results: According to the results obtained, although the MCC ratio of the developed composite resins increased, no significant change in bending stress was observed and it was determined that it had weaker mechanical properties compared to the commercial product. These values are 35.31, 35.50, 39.85 MPa for the designed composite resins and 78.8 MPa for the commercial product. According to the microhardness results of the samples, it was observed that the micro hardness of the samples increased with increasing MCC ratio. Water, cola, tea and coffee beverages were evaluated according to their MCC content and maximum color change was obtained by keeping the sample containing 20% MCC in coffee for 1 week. Conclusion: The increase in the MCC ratio used in the dental composite resin system did not cause an increase in the flexural stress properties of the samples, but also caused a significant increase in the microhardness values and color changes. Keywords: Microcrystalline cellulose, dental composite resin, microhardness, flexural stress, color change.