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Sains Malaysiana 54(2)(2025): 547-555
http://doi.org/10.17576/jsm-2025-5402-19
Impact of Light
Curing Modes on Microleakage in Alkasite and High
Viscosity Glass Ionomer Cement Restorations
(Kesan Mod Pengawetan Cahaya Ringan terhadap Kebocoran Mikro dalam Alkasit dan Pemulihan Simen Ionomer Kaca Kelikatan Tinggi)
Jian Sheng Lee & Noor
Azlin Yahya*
Department of
Restorative Dentistry, Faculty of Dentistry, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
Diserahkan: 30 Jun 2024/Diterima:
12 November 2024
Abstract
Light curing modes influence the polymerisation shrinkage of dental
materials, and subsequently affect the degree of microleakage generated from
the resultant contraction stress. Alkasite and high
viscosity glass ionomer cement (HVGIC) are newer light-cured tooth-coloured
restorative materials for restoring posterior proximal or Class II cavities.
This study investigated the impact of light curing modes and test materials on
the microleakage of alkasite Cention N (CN) and Riva Light Cure HVGIC (RV). Twenty sound premolars were randomly
segregated into two groups, i.e., Group CN and Group RV. Class II slot cavities
of standard dimension (3 mm bucco-lingually, 2 mm mesio-distally and 5 mm occluso-gingivally)
were prepared on both proximal surfaces of all teeth, resulting in twenty
cavities in each group. Within groups, ten cavities were cured under high
power, while the others were cured under soft-start polymerisation. The samples
were then thermocycled at 5 °C and 55 °C for 500
cycles before immersion in 0.5% methylene blue dye for 24 h. The samples were
sectioned mesio-distally into buccal and lingual
halves. Occlusal and cervical microleakage scores were obtained under a
stereomicroscope at 100× magnification. Data were analysed using the Mann-Whitney
U Test and multinomial logistic regression (p < 0.05). Results showed that
the impact of light curing mode on microleakage was insignificant. The majority
of CN samples (67.5%) presented no occlusal microleakage (score 0), while RV
samples (90%) presented occlusal microleakage up to enamel (score 1). Cervical
microleakage was significantly higher than occlusal microleakage for both
groups.
Keywords: Alkasite;
high viscosity glass ionomer cement; light curing mode; microleakage;
polymerisation shrinkage
Abstrak
Mod penyinaran lampu mempengaruhi penyusutan polimerisasi bahan pergigian dan seterusnya mempengaruhi tahap kebocoran mikro yang dihasilkan daripada tekanan susutan tersebut. Alkasit dan simen ionomer kaca bertekstur tinggi (HVGIC) adalah bahan pergigian berwarna yang dipekakan dengan cahaya yang baharu, digunakan untuk restorasi kaviti kelas II. Penyelidikan ini menganalisis kesan mod penyinaran lampu dan bahan ujian terhadap kebocoran mikro alkasit Cention N (CN) dan Riva
Light Cure HVGIC (RV). Dua puluh gigi premolar yang sihat dibahagikan secara rawak kepada dua kumpulan, iaitu Kumpulan CN
dan Kumpulan RV. Kaviti slot kelas II dengan dimensi piawai (3 mm buko-lingual, 2 mm mesio-distal dan 5 mm okluso-gingival) disediakan pada kedua-dua permukaan proximal semua gigi, menghasilkan dua puluh kaviti dalam setiap kumpulan. Dalam kumpulan, sepuluh kaviti dirawat di bawah kuasa tinggi, manakala sepuluh yang lain
di bawah polimerisasi bermula rendah. Sampel kemudian dikitar termos pada suhu 5 °C dan 55 °C selama 500 kitaran sebelum direndam dalam pewarna metilena biru 0.5% selama 24 jam. Sampel dipotong menjadi separuh bukal dan lingual secara mesio-distal. Skor kebocoran mikro oklusal dan servikal diperoleh di bawah stereomikroskop pada pembesaran 100×. Data dianalisis menggunakan Ujian Mann-Whitney dan regresi logistik multinomial (p < 0.05). Keputusan menunjukkan bahawa kesan mod penyinaran lampu terhadap kebocoran mikro adalah tidak signifikan. Kebanyakan sampel CN
(67.5%) tidak menunjukkan kebocoran mikro oklusal (skor 0), manakala sampel RV (90%) menunjukkan kebocoran mikro oklusal sehingga ke enamel (skor 1). Kebocoran mikro di servikal adalah signifikan lebih tinggi daripada kebocoran mikro oklusal untuk kedua-dua kumpulan.
Kata kunci: Alkasit; kebocoran mikro; mod penyinaran lampu; penyusutan polimerisasi; simen ionomer kaca bertekstur tinggi
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