DİŞ BEYAZLATMA İŞLEMİNİN LİTYUM DİSİLİKAT SERAMİĞİN BAĞLANMA DAYANIMINA ETKİSİ

Year 2020, Volume: 30 Issue: 1, 113 - 121, 15.01.2020

Merve Yıldırak Rıfat Gözneli

https://doi.org/10.17567/ataunidfd.528333

Abstract

Amaç: Bu
çalışmanın amacı, LED ışık ile aktive edilen %32’lik hidrojen peroksit diş beyazlatma
ajanı uygulamasının, farklı periyotlarda lityum disilikat veneerlerin adeziv
rezin simantasyonu sonrasındaki makaslama bağlanma dayanımlarına etkisini
incelemektir.

Gereç ve yöntem: Kırk beş adet çekilmiş, üst santral insan dişi 3
gruba ayrılmıştır (n=15). Kontrol grubu (K) olarak tasarlanan gruba beyazlatma
işlemi uygulanmadan dişler mine seviyesinde prepare edilip, lityum disilikat
veneerlerin simantasyonu yapılmıştır. Beyazlatma gruplarındaki örneklerin labial
yüzeylerine LED ışık ile aktive edilerek % 32’lik hidrojen peroksit ajan uygulanmıştır.
Beyazlatma işlemini takiben hemen (Grup B0), diş mine seviyesinde prepare
edilip simantasyonları yapılmıştır. Diğer beyazlatma
grubundaki örnekler (Grup B7), beyazlatma işlemini takiben 7
gün 37⁰C distile su içerisinde saklanıp, preparasyon ve
simantasyonları yapılmıştır. Simantasyon sonrası her grup 24 saat 37⁰C distile su içerisinde bekletilip
örneklerin makaslama bağlanma dayanımları üniversal test cihazında dakikada 0,5
mm ilerleme hızıyla ölçülmüştür. Diş ve seramik örneklerin kopma paternleri
ışık mikroskobu altında incelenmiştir. Normal dağılım gösteren verilerin
karşılaştırılmasında tek yönlü varyans analizi (One-way ANOVA) kullanılırken,
gruplar arasındaki farklılığın nereden kaynaklandığını bulmak için Bonferroni
düzeltmeli ortalama karşılaştırması yapılmıştır.

Bulgular: K grubunun ortalama makaslama bağlanma dayanımı değerleri
30,04 MPa iken, B0 grubunun ortalama makaslama bağlanma dayanımı değerleri
20,34 MPa’a düşmüş ve B7 grubunda ise 27,02 MPa’a çıkmıştır. Beyazlatmadan
hemen sonra restore edilen dişlerde bağlanma kuvveti anlamlı miktarda
azalmıştır (p<0,001). K grubunda tip 1 ve tip 3 kopma paternleri görülürken,
tip 2 kopma paterni görülmemiştir. B0 grubunda tip 2 ve tip 3 kopma paterni bulunurken,
tip 1 kopma paterni görülmemiştir. B7 grubunda ise bütün kopma paternleri görülmüştür.

Sonuç: Beyazlatma işlemini takiben dişlere restorasyon uygulanması
rezin simanın mineye bağlantısını olumsuz etkilemektedir. Tam seramik
restorasyon yapılacak dişlere LED ile aktive edilen beyazlatma işlemi
uygulanması planlanıyorsa beyazlatma işlemi sonrası en az 1 hafta beklenmesi
önerilebilir. 

Anahtar kelimeler: LED, hidrojen peroksit, rezin siman,
makaslama bağlanma dayanımı.

THE EFFECT OF TOOTH BLEACHING ON THE BOND
STRENGTH OF A LITHIUM DISILICATE CERAMIC 

ABSTRACT 

Aim: The aim of this study
was to investigate the effect of 32% hydrogen peroxide bleaching agent
activated by LED on the shear bond strength of lithium disilicate veneers after
adhesive resin cementation.

Materials
and Methods:  Forty-five extracted human maxillary central teeth were divided
into 3 groups (n = 15). The control group (K) was designed as without bleaching
and the teeth were prepared at the enamel surfaces and lithium disilicate
veneers were cemented with adhesive resin cement. The other groups,
32% hydrogen peroxide agent activated by LED was applied to the labial surfaces
of teeth. Following the bleaching immediately, tooth reduction was made on
enamel surfaces and cemented with adhesive resin cement (Group B0). The samples
of the other bleaching group (Group B7) were stored in 37⁰C
distilled water for 7 days after bleaching then, tooth reduction was made on
enamel surfaces and cemented with adhesive resin cement. After cementation,
each group was kept in 37⁰C distilled water for 24 hours and the
shear bond strength values were measured by a universal testing machine with a crosshead
speed of 0,5 mm/min. The failure modes of tooth and ceramic samples were
examined under light microscope. One way ANOVA
test was used in comparison of groups and Post hoc Bonferroni multiple
comparison test was utilized to specify the differences.

Results: The mean shear bond
strength values of the K group were 30.04 MPa, while in B0 group decreased to
20.34 MPa and in B7 groups increased to 27.02 MPa. Immediately after bleaching,
the shear bond strength values of the teeth was significantly reduced (p
<0.001). While type 1 and type 3 failure modes were observed in group K,
type 2 was not observed. While type 2 and type 3 failure modes were found in
group B0, type 1 failure mode was not observed. All failure modes were observed
in group B7.

Conclusion:
Adhesive
restoration of the teeth after bleaching negatively affects the bonding of
resin to the enamel. It is recommended to wait for at least 1 week after
bleaching activated by LED, if it is planned to make an all-ceramic
restoration. 

Keywords: LED, hydrogen peroxide,
resin cement, shear bond strength.

Keywords

LED, hidrojen peroksit, rezin siman

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