EFFECT OF THERMOCYCLING ON MECHANICAL AND SURFACE PROPERTIES OF THREE POSTERIOR RESTORATIVE MATERIALS

Yıl 2021, Cilt: 8 Sayı: 2, 352 - 358, 31.08.2021

Sinem Akgül , Ahmet Hazar İhsan Yıkılgan , Suat Özcan , Mine Betül Üçtaşlı , Oya Bala

https://doi.org/10.15311/selcukdentj.646987

Cited By: 1

Öz

Background:
To evaluate the mechanical and surface properties of two glass ionomer
restorative systems (EQUIA Fil, Ionostar Molar) and a resin composite (Charisma
Classic ) after thermocycling.

Methods:
Twenty disk-shaped samples were prepared from each material in teflon molds
according to manufacturer’s instructions. After the samples were stored in
distilled water at 37 ⁰C for 24 h, microhardness and surface
roughness measurements were performed from each group and repeated after 5000
and 10000 thermocycling. Scanning electron microscopy examinations were also
performed. The data were analyzed by using Wilcoxon signed rank and Bonferroni
corrected multiple comparison tests.

Results: EQUIA
did not exhibit significant differences in its micohardness values after
thermocycling (p >  0.0056). In contrast, Ionostar Molar and
Charisma Classic exhibited statistically significant decreases in baseline
microhardness after 5000 and 10000 thermocycling processes (each p <
0.0056). However, there were no significant differences between 5000 and 10000
thermocycling groups for Charisma Classic (p = 0.007).
Ionostar Molar exhibited no statistically significant differences between its
surface roughness values before and after thermocycling groups (p > 0.0017). Similarly, there were no significant
differences between baseline and 5000 thermocycling groups for EQUIA and
Charisma Classic (p > 0.0017). However, a
statistically significant increase was observed after 10000 thermocycles for
both of these two materials (p < 0.001 and p = 0.002, respectively).

Conclusion: The
EQUIA and Ionostar Molar exhibited mechanical features similar to those of a
resin composite, and thus, represent promising materials for permanent
restorations.

Keywords: Glass
ionomer, scanning electron microscopy, surface
properties 

Anahtar Kelimeler

Glass ionomer, scanning electron microscopy, surface properties

ISISIAL DÖNGÜ İLE YAŞLANDIRMANIN ÜÇ POSTERIOR RESTORATİF MATERYALİN MEKANİK VE YÜZEY ÖZELLİKLERİ ÜZERİNE ETKİSİ

Öz

Amaç:  İki cam iyonomer
restoratif sistem (EQUIA Fil, Ionostar Molar) 
ve bir kompozit rezinin  (Charisma
Classic ) mekanik ve yüzey özelliklerinin kıyaslanması

Gereç
ve Yöntemler: Her materyalden 20
adet disk şeklinde örnek teflon kalıpta, üretici talimatları doğrultusunda
hazırlandı.  Örnekler distile suda 37 ⁰C
de 24 saat bekletildikten sonra 10 örnekte mikrosertlik, 10 örnekte yüzey
pürüzlülük ölçümleri yapıldı ve ölçümler 5000 ve 10000 ısısal döngü sonrası
tekrar edildi. Tarama elektron mikroskopisi değerlendirmesi için her
materyalden üçer örnek daha hazırlandı. Veriler Wİlcoxon işaretli sıralar ve
Bonferroni düzeltmeli çoklu karşılaştırma testi kullanılarak değerlendirildi.

Bulgular: Equia ısısal döngü sonrası mikrosertliğinde anlamlı bir
değişim göstermemiştir (p  > 
0.0056). Ionostar Molar ve
Charisma Classic ise 5000 ve 10000 ısısal döngü sonrası başlangıç
mikrosertliğine göre anlamlı azalma gözlenmiştir(ikisi de; p < 0.0056). Ancak, Charisma Classic
materyalinin 5000 ve 10000 ısısal döngü sonrası mikrosertlik değerleri arasında
fark gözlenmemiştir (p = 0.007).  Yüzey
pürüzlülüğü değerlendirildiğinde, Ionostar Molar başlangıç ve ısısal döngü
sonrası grupları arasında anlamlı fark tespit edilmemiştir (p >
0.0017). Benzer şekilde, Equia ve
Charisma Classic gruplarında başlangıç ve 5000 ısısal döngü sonrası grupları
arasında istatistiksel anlamlı fark gözlenmemiştir (p > 0.0017).  Ancak 10000 ısısal döngü sonrası
Equia ve Ionostar Molar gruplarında yüzey pürüzlülük değerleri başlangıç
değerlerine gore anlamlı derecede artmıştır 
(sırasıyla; p <
0.001 ve p
= 0.002).

Sonuç: Equia ve Ionostar Molar, rezin kompozite benzer mekanik
özellikler göstermiştir ve bu sebeple kalıcı restorasyonlarda kullanım için
ümit vaat etmektedir.

Anahtar
kelimeler: Cam iyonomer,
tarayıcı elektron mikroskobisi, yüzey özellikleri 

Anahtar Kelimeler

Cam iyonomer, tarayıcı elektron mikroskobisi, yüzey özellikleri

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