Sains Malaysiana 51(9)(2022): 2999-3008

http://doi.org/10.17576/jsm-2022-5109-20

Effect of Oral Environmental pH on the Dynamic Characterization of Bioactive Restorative Materials

(Kesan pH Persekitaran Oral terhadap Pencirian Dinamik Bahan Pemulihan Bioaktif)

JOSHUA ONG EE XIN¹, ADRIAN YAP U-JIN², AZWATEE ABDUL AZIZ³ & NOOR AZLIN YAHYA^3,*

¹Centre for Restorative Dentistry Studies, Faculty of Dentistry, Universiti Teknologi MARA, 47000 Sungai Buloh, Selangor Darul Ehsan, Malaysia

²Department of Dentistry, Ng Teng Fong General Hospital, National University Health System, Singapore

³Department of Restorative Dentistry, Faculty of Dentistry, Universiti Malaya, 50603 Kuala Lumpur, Wilayah Persekutuan, Malaysia

Diserahkan: 6 Februari 2022/Diterima: 23 April 2022

Abstract

The objective of this study was to investigate the effects of oral environmental pH on the viscoelastic properties of bioactive restorative materials (BRMs) by using dynamic mechanical analysis. Stainless steel molds were used to fabricate 40 beam-shaped specimens (12 × 2 × 2 mm) for each material. The specimens were finished, measured, randomly divided into four groups (n = 10), and immersed in aqueous solutions of pH 3.0, 5.0, 6.8, and 10.0 at 37 °C for seven days. The specimens were then subjected to dynamic mechanical analysis with a 5 N load and frequency range of 0.1-10.0 Hz. Data were analyzed using one-way ANOVA/Dunnet T3’s test (α = 0.05). Mean elastic modulus spanned from 2.68 ± 0.17 to 6.49 ± 0.71 GPa, while viscous modulus ranged from 0.43 ± 0.03 to 0.62 ± 0.12 GPa. Loss tangent differed from 77.30 ± 4.90 to 164.50 ± 9.12. Significant differences among pH were discerned for (i) Elastic modulus: Cention N - pH 3.0, 5.0, 10.0 > 6.8; Activa Bioactive - pH 3.0, 6.8, 10.0 > 5.0, (ii) Viscous modulus: Cention N - pH 3.0, 5.0, 10.0 > 6.8, and (iii) Loss tangent: Activa Bioactive - pH 5.0 > 3.0, 6.8, 10.0. Significant differences in viscoelastic properties were noted among the BRMs with Activa Bioactive presenting the lowest elastic modulus for all pH. Immersion of all materials in pH 6.8 yielded the highest elastic modulus, except for Activa Bioactive. The effects of environmental pH on viscoelastic properties of BRMs are material-dependent.

Keywords: Bioactive; dynamic mechanical analysis; pH; viscoelastic

Abstrak

Objektif kajian ini adalah untuk mengenal pasti kesan pH persekitaran mulut pada sifat viskoelastik bahan pemulihan bioaktif (BRM) dengan menggunakan analisis mekanikal dinamik. Acuan keluli tahan karat digunakan untuk menghasilkan 40 spesimen ujian berukuran 12 × 2 × 2 mm bagi setiap bahan. Kesemua spesimen tersebut kemudiannya dirapikan, diukur dan dibahagikan secara rawak kepada empat kumpulan. Spesimen daripada setiap kumpulan (n =10) direndam di dalam larutan akueus yang mempunyai pH 3.0, 5.0, 6.8 dan 10.0 pada suhu 37 °C, selama tujuh hari. Spesimen kemudiannya tertakluk kepada analisis mekanikal dinamik dengan beban 5 N dan julat frekuensi di antara 0.1-10.0 Hz. Data dianalisis menggunakan ujian ANOVA/Dunnet T3 sehala (α = 0.05). Purata modulus elastik mempunyai julat antara (2.68 ± 0.17 GPa) dan (6.49 ± 0.71 GPa), manakala purata modulus likat adalah antara (0.43 ± 0.03 GPa) dan (0.62 ± 0.12 GPa). Purata kehilangan tangen pula adalah antara (77.30 ± 4.9) dan (164.50 ± 9.12). Keputusan analisis dari segi pH adalah seperti berikut: (i) Modulus elastik: Cention N - pH 3.0, 5.0, 10.0 > 6.8; Activa Bioactive - pH 3.0, 6.8, 10.0 > 5.0, (ii) Modulus likat: Cention N - pH 3.0, 5.0, 10.0 > 6.8 dan (iii) Kehilangan tangen: Activa Bioactive – pH 5.0 > 3.0, 6.8, 10.0. Perbezaan ketara dari segi sifat viskoelastik antara pelbagai bahan telah dapat dikesan dan modulus elastik bagi bahan Activa Bioactive didapati paling rendah dalam semua pH rendaman. Semua bahan yang direndam di dalam pH 6.8 menghasilkan modulus elastik tertinggi, kecuali Activa Bioactive. Kesimpulannya, kesan pH persekitaran ke atas sifat viskoelastik BRM adalah bergantung kepada bahan-bahan ujian.

Kata kunci: Analisis mekanikal dinamik; bioaktif; pH; sifat viskoelastik

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^*Pengarang untuk surat-menyurat; email: nazlin@um.edu.my