Temperature changes caused by light curing of fiber-reinforced composite resins

Abstract

Objective:The aim of the study is to evaluate temperature change in fiber-reinforced composite (FRC) resin photopolymerized with a light-emitting diode (LED) light-curing unit (LCU).Materials and Methods:Forty dentine disks (1 mm thick and 8 mm diameter) were prepared from human molars. The FRC specimens (2 mm thickness and 8 mm diameter) consisted of polyethylene fiber (Construct (CT)) products or glass fiber (ever Stick (ES)) and one hybrid composite bonded to the dentin disks and polymerized with an LED LCU. Control groups were prepared using the hybrid composite. Temperature rise in dentine samples under the FRC bonded disks was measured using a K-type thermocouple, and data were recorded. Temperature change data were subjected to analysis of variance (ANOVA) and Duncan's test.Results:The results show that addition of fiber (one or two layers) did not change temperature rise values at any of the exposure times (P > 0.05). The CT fiber/two layer/40 s group exhibited the greatest temperature rise (5.49 ± 0.62) and the ES/one layer/10 s group the lowest rise (1.75 ± 0.32). A significant difference was observed in temperature rise measured during 10 and 20 s exposures (P < 0.05).Conclusion:Maximal temperature rise determined in all groups was not critical for pulpal health, although clinicians need to note temperature rises during polymerization.

Perbedaan Stabilitas Warna E-Glass Fiber Non Dental Reinforced Composite Akibat Lama Perendaman Dalam Saliva Buatan

“…3 Keunggulan glass fiber emiliki transparansi, kekuatan dan kelenturan yang lebih baik. 11 Jenis glass fiber dengan tipe E-glass fiber sering di gunakan dalam kedokteran gigi karena ketahanannya terhadap reaksi kimia, memiliki sifat estetis yang baik, biokompatibel, dan relatif tidak sensitif ter hadap kelembapan dan mempunyai ketahanan terhadap kimia dan panas. E-glass fiber dental di Indonesia cukup terbatas dengan harga yang relatif mahal memiliki keterbatasan yaitu harganya mahal, namun glass fiber non dental banyak tersedia dengan harga yang terjangkau.…”

“…10 Fiber memiliki sifat mekanis yang sangat baik untuk restorasi, memiliki kekuatan terhadap tekanan yang lebih unggul, kemudahan perbaikan, non korosif, translucency yang mirip dengan struktur gigi dan memiliki sifat ikatan yang baik. 11 Resin komposit merupakan bahan restorasi yang paling populer saat ini karena penggunaan nya yang universal, dan kemampuan untuk ditempatkan secara langsung tanpa prosedur laboratorium. 18 Penambahan glass fiber dapat memberikan pengaruh berupa penurunan nilai penyerapan air dan peningkatan stabilitas warna.…”