PENGARUH IN-OFFICE BLEACHING SISTEM AKTIVASI HEAT LIGHT DAN KIMIAWI TERHADAP PERUBAHAN KEKERASAN RESIN KOMPOSIT NANOFIL DAN NANOKERAMIK

• Main Authors: , Sila Happy Muriana, , drg. Diatri Nari Ratih, MKes., Sp.KG, PhD.
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2012
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/99157/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=54680
• Institution: Universitas Gadjah Mada

In office bleaching is a technique of bleaching treatment which is carried out by a dentist using hydrogen peroxide agents, and can be activated using heat light (thermocatalitic) or chemical system. Patients who need bleaching treatment, sometimes has already had composite resin restoration on their teeth. Moreover, composite resin restoration is also needed to restore caries and cracking teeth before bleaching procedure to prevent sensitivity during bleaching procedure. Recently, nanofil and nanoceramic composite has been frequently used for restoring teeth. This in vitro study aimed to investigate the effect of in office bleaching using heat light and chemical activation system on the microhardness alteration of nanofil and nanoceramic composite resin. Twenty samples of composite resin and 38% hydrogen peroxide as bleaching agent were used in this study. Samples were assigned into 2 groups of 10 each (nanofil and nanoceramic), then each group was divided into 4 treatment groups and 2 control groups. Group I, nanofil activated using heat light system, Group II, nanofil activated using chemical system, Group III, nanoceramic activated using heat light system and Group IV, nanoceramic activated using chemical system. Control groups were not applied by bleaching agent. The surface microhardness of each sample was tested before and after performing in office bleaching using microhardness tester (Vickers Hardness Tester) . Data obtained were the value of microhardness after in office bleaching subtracted by the value of microhardness before in office bleaching. Data then analysed using two way ANOVA, followed by LSD test at 95% level of significance. The lowest alteration in surface hardness occured in nanofil composite resin group activated chemical system and the highest alteration occured in nanoceramic composite resin activated with heat light. The results showed that the type of composite resin (nanofil and nanoceramic) as well as the bleaching activation system (heat light and chemical) influence on the alteration of surface microhardness (p<0,05). However, there was no interaction between type of composite resin and bleaching activation system (p>0.05). It can be concluded that in office bleaching using heat light and chemical activated system altered the microhardness of nanofil and nanoceramic composite resin. The greater microhardness alteration occurred on nanoceramic composite resin activated by heat light system, whereas the lower microhardness alteration occurred on nanofil composite resin activated by chemical system.