Kekerasan permukaan semen ionomer kaca konvensional tipe II akibat lama penyimpanan (The surface hardness of type II conventional glass ionomer cement conventional because of the length of storage)

• Main Authors: Asti Meizarini (Author), Irmawati Irmawati (Author)
• Format: Book
• Published: Universitas Airlangga, 2005-09-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 1978-3728; 2442-9740; 10.20473/j.djmkg.v38.i3.p146-150
• Keywords: glass ionomer cement; surface hardness; storage; Dentistry; RK1-715
• Source: Dental Journal, Vol 38, Iss 3, Pp 146-150 (2005)

<span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>Type II conventional glass-ionomer cements (GIC) are restorative materials consisting of powder and liquid mixed to produce </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>a plastic mass that subsequently sets to a rigid solid. The early GIC was marketed without the expired date, although this material </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>has been currently marketed with the expired date, how stable the materials are not yet clear. The purpose of this study was to </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>evaluate the powder and the liquid GIC storage on the surface hardness of the samples. Six disc samples (5 mm in diameter and </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>3 mm thick) were made for each of four groups consisting of powder: aged liquid ages, aged powder: new liquid new, new powder </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>new: new liquid new and aged powder: aged liquid ages respectively. All samples prepared followed the manufacturers' </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>recommendations and were allowed to set for 15 minutes then they were kept for 24 hours at room temperature before testing. </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>Vickers microhardness was assessed for measuring the surface hardness at the top of the sample surface. The data were statistically </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>analyzed using an ANOVA and LSD (p < 0.05). The results of this study indicated that the highest surface hardness was on the </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>group of new powder: new liquid new = 52.040 VHN. The other groups were nearly similar, for new powder: aged liquid, aged </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>powder: new liquid, aged powder: aged liquid they were 49.558 VHN; 49.123 VHN; 48.938 VHN respectively. Conclusion, powder </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>and liquid of the type II conventional glass ionomer that had been stored for a long time descreased the surface hardness of the glass </em><span style="font-family: TribuneItalic; font-size: 9pt; color: #000000; font-style: normal; font-variant: normal;"><em>ionomer cements.</em></span></span></span></span></span></span></span></span></span></span></span></span></span>