EFFECT OF LASER TREATMENTS ON THE STRENGTH OF DENTURE BASE REPAIR

Abstract

Purpose: The aim of this study was to investigate the effect of Er;Cr;YSGG laser treatment with different energy levels before sandblasting and grinding on the transverse strength of denture base resin repaired with autopolymerizing resin. Material and Methods: A total of seventy rectangular specimens (65X10X3.3 mm) were prepared from heatpolymerized acrylic resin, which was repaired with autopolymerizing resin following conditioning methods: a) without surface treatment (control) b) grinding, c) sandblasting, d) Er;Cr;YSGG laser at 3 W-20 Hz + grinding, e) Er;Cr;YSGG laser at 3 W-20 Hz + sandblasting, f) Er;Cr;YSGG laser at 4 W-20 Hz + grinding, g) Er;Cr; YSGG laser at 4 W-20 Hz + sandblasting. The transvers strength was measured by a three-point bending test using a universal testing machine. Data were analyzed using 1-way ANOVA and Tukey’s Post Hoc test (p<0.05). Results: Er;Cr;YSGG laser application at 4 W-20Hz before sandblasting occured significantly higher values (30.48±7.66 MPa) when compared to the control group (15.48±4.32 MPa) (p<0.001). Grinding demonstrated the lowest values (9.38±4.62 MPa) among all the groups. Sandblasting showed significantly higher values than grinding (p<0.01). Laser application at 4W-20 Hz + sandblasting demonstrated significantly higher strength values than sandblasting alone (p<0.05). Conclusions: Surface pretreatments before repairing significantly affect the transvers strength of repaired denture base resin. Er;Cr;YSGG laser pretreatment at 4 W-20Hz before sandblasting may be useful to increase the transvers strength of denture base repairs

Keywords

• denture repair, lasers, acrylic resin

LAZER UYGULAMALARININ PROTEZ KAİDE TAMİRİNİN DAYANIMINA ETKİSİ

Abstract

Amaç: Bu çalışmanın amacı, kumlama ve frezleme yapmadan önce değişik enerji seviyelerindeki Er;Cr;YSGG  lazer uygulamasının otopolimerizan akrilin transvers dayanımına olan etkisini incelemektir.

Gereç ve Yöntem: Toplam 70 adet dikdörtgen şeklindeki örnekler (65X10X3.3 mm) ısıyla polimerize olan akrilik rezinden üretilmiştir. Bu örnekler aşağıdaki yüzey işlemlerinden birini takiben otopolimerizan akril ile tamir edilmiştir: a) Herhangi bir yüzey işlemi yapılmamış (kontrol), b) Frezleme, c) Kumlama, d) Er;Cr;YSGG lazer (3 W-20 Hz)  + frezleme, e) Er;Cr; YSGG lazer (3 W-20 Hz)  + kumlama, f) Er;Cr;YSGG lazer (4 W-20 Hz)  + frezleme, g) Er;Cr;YSGG lazer (4 W-20 Hz)  + kumlama. Transvers dayanımı universal test cihazında 3 nokta bükme testi kullanılarak ölçülmüştür. Elde edilen veriler tek yönlü ANOVA ve Tukey’in  Post Hoc testi kullanılarak analiz edilmiştir.

Bulgular: Kumlama yapılmadan önce 4 W-20Hz’lik  Er;Cr;YSGG lazer  uygulaması (30.48±7.66 MPa)  kontrol grubuna (15.48±4.32 MPa)  göre daha yüksek değerler oluşturmuştur. Frezleme, tüm gruplar içinde en düşük sonuçlara neden olmuştur (9.38±4.62 MPa). Kumlama işlemi, frezleme işleminden anlamlı bir şekilde yüksek bulunmuştur (p<0.01). 4 W-20Hz’lik  Er;Cr;YSGG lazer + kumlama uygulaması sadece kumlama yapılan gruba göre daha yüksek çıkmıştır.

Sonuçlar: Tamir yapmadan önce akrilik kaide rezin yüzeyine uygulanan ön işlemler tamir dayanımını etkilemektedir. Kumlamadan önce 4 W-20 Hz’lik  Er;Cr;YSGG lazer uygulaması akrilik rezinin tamir dayanımını arttırmada faydalı olabilir.

Keywords

• protez tamiri, lazerler, akrilik rezin

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