Electronic Theses and Dissertation

Nama : Nabila
Fakultas : Kedokteran Gigi Program
Studi : Pendidikan Dokter Gigi
Judul : Pengaruh Variasi Durasi Penyinaran Resin Komposit Nanohibrida kedokteran gigi terhadap pelepasan Bisphenol-A (BPA) Dalam kopi Robusta Gayo.

Resin komposit nanohibrida banyak digunakan sebagai bahan restorasi dalam kedokteran gigi, namun polimerisasi yang tidak optimal dapat menyebabkan pelepasan monomer sisa yang terdekomposisi menjadi Bisphenol-A (BPA) yang bersifat toksik dan berpotensi memengaruhi kesehatan. Penelitian ini bertujuan untuk menganalisis pengaruh variasi durasi penyinaran terhadap pelepasan dan akumulasi BPA serta perubahan derajat konversi resin komposit nanohibrida setelah perendaman dalam larutan kopi Robusta Gayo. Penelitian eksperimental laboratori ini dilakukan secara in-vitro menggunakan spesimen resin komposit nanohibrida yang disinari selama 10 detik dan 20 detik, kemudian direndam dalam larutan kopi Robusta Gayo pH 4,7 selama tujuh hari; pelepasan BPA dianalisis menggunakan spektrofotometer UV–Vis, sedangkan identifikasi gugus fungsi dan perhitungan derajat konversi dianalisis menggunakan ATR-FTIR. Hasil penelitian menunjukkan bahwa penyinaran 20 detik menghasilkan pelepasan dan akumulasi BPA yang lebih rendah dibandingkan penyinaran 10 detik, meskipun terjadi fluktuasi pelepasan harian, akumulasi pelepasan BPA meningkat seiring waktu perendaman pada kedua kelompok dengan nilai kumulatif yang lebih tinggi pada kelompok 10 detik. Derajat konversi resin komposit pada kelompok penyinaran 20 detik (66,08%) lebih tinggi dibandingkan kelompok 10 detik (59,42%), namun perbedaannya tidak signifikan secara statistik, dan spektra FTIR menunjukkan adanya gugus fungsi khas BPA pada media perendaman. Pada penelitian ini dapat disimpulkan bahwa durasi penyinaran berpengaruh terhadap pelepasan dan akumulasi BPA serta derajat konversi resin komposit nanohibrida, di mana penyinaran 20 detik meningkatkan derajat konversi monomer menjadi polimer sehingga menurunkan jumlah monomer sisa dan mengurangi akumulasi pelepasan BPA, sementara sifat asam kopi Robusta Gayo mempercepat degradasi resin dan meningkatkan potensi pelepasan BPA.

Kata kunci: resin komposit nanohibrida, Bisphenol-A, durasi penyinaran, derajat konversi, kopi Robusta Gayo.

Name : Nabila Faculty : Dentistry Programme study : Dentistry Title : The Effect of Exposure Time of Nanohybrid Dental Composite Resin on Bisphenol-A (BPA) Release in Robusta Gayo Coffee In dentistry, nanohybrid composite resins are widely used as restorative materials. However, inadequate polymerization can lead in the release of residual monomers, which decompose into and generate the poisonous and possibly dangerous Bisphenol-A (BPA). The aim of this study is to analyze the various exposure times affect BPA release and accumulation as well as variation in the degree of conversion of nanohybrid composite resin following immersion in Gayo Robusta coffee solution. Nanohybrid composite resin specimens were used in this in vitro laboratory experiment that were exposed 10 and 20 seconds. The specimens were followed by cylic immersed in a pH 4.7 Gayo Robusta coffee solution for 20 minutes and in aquadest for 23 hours and 40 minutes for seven days. A UV-Vis spectrophotometer was utilized for determining BPA release, and ATR-FTIR was used to calculate the degree of conversion and to identify functional groups. The results of this study reveal that variations in release, 20-second irradiation resulted to a lower BPA accumulation and release compared 10-second irradiation. Accumulation of BPA release increase with immersion time of both groups, and with the 10-second irradiation shows significantly. FTIR spectra revealed the presence of characteristic BPA functional groups in the immersion medium, and the degree of composite resin conversion in the 20-second irradiation group (66.08%) was higher than in the 10-second group (59.42%), but the difference was not statistically significant. The results of this study indicate that the length of irradiation is an effect on the release and accumulation of BPA as well as the degree of conversion of nanohybrid composite resins. While the acidic properties of Gayo Robusta coffee accelerate in resin degradation and increase potential BPA release and the longer irradiation increases the degree of monomer conversion into polymers, thereby reducing the amount of residual monomers and decreasing the accumulation of BPA release. Keywords: nanohybrid composite resin, Bisphenol-A, light-curing duration, degree of conversion, Robusta Gayo coffee.