The effect of various bases on the fracture resistance of amalgam.

W. F. Pierpont, S. E. Gray, C. B. Hermesch, Thomas (Tom) Hilton

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This study compared the compressive force required to fracture amalgam over nine base materials: a calcium hydroxide product (Dycal); two autocured glass ionomers (GlasIonomer Base Cement and Ketac-Bond); three light-cured glass ionomers (Photac-Bond, Variglass VLC, and Vitrebond); two light-cured resins (Timeline and VLC Dycal); and a zinc phosphate cement (Fleck's Zinc Cement). For the control group, 10 aluminum dies (25 mm x 12 mm x 10 mm) were milled with 3.0 mm x 3.0 mm slots, which were filled with hand-condensed Tytin amalgam with no underlying base. For experimental groups, 10 aluminum dies of equal dimension were milled with 3.5 mm x 3.0 mm slots. Following manufacturer's instructions, the nine base materials were successively placed in these 10 dies using a depth-limiting device made of light-transmitting clear acrylic to ensure a 0.5 mm thickness, and Tytin amalgam was again condensed over each base such that the depth of the amalgam equalled that in the control. All test specimens were stored in 100% humidity for 48 hours then fractured in compression on an Instron machine. Mean force, in Newtons (S D in parentheses), required to fracture the specimens was: Control: 1934(210), Zinc Cement: 1874(147), GlasIonomer Base Cement: 1839(174), Ketac-Bond: 1723(225), Vitrebond: 1485(155), Photac-Bond: 1422(294), Advanced Formula II Dycal: 1296(237), VLC Dycal: 1035(116), Variglass: 909(294) and Timeline: 906(275). ANOVA and Student-Newman-Keuls statistical analysis (alpha = 0.05) indicated that the autocuring glass ionomers, GlasIonomer Base Cement and Ketac-Bond, and a zinc phosphate cement, Zinc Cement, provided significantly more fracture resistance for amalgam than the other bases tested and were not statistically different from a no-base control.

Original languageEnglish (US)
Pages (from-to)211-216
Number of pages6
JournalOperative Dentistry
Volume19
Issue number6
StatePublished - Nov 1994
Externally publishedYes

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Zinc Phosphate Cement
Zinc
Aluminum
Light
Calcium Hydroxide
Humidity
Analysis of Variance
Hand
Students
Equipment and Supplies
Control Groups
Dycal
glass ionomer
Ketac-Bond
Photac-Bond
Vitrabond
TimeLine
tytin

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Pierpont, W. F., Gray, S. E., Hermesch, C. B., & Hilton, T. T. (1994). The effect of various bases on the fracture resistance of amalgam. Operative Dentistry, 19(6), 211-216.

The effect of various bases on the fracture resistance of amalgam. / Pierpont, W. F.; Gray, S. E.; Hermesch, C. B.; Hilton, Thomas (Tom).

In: Operative Dentistry, Vol. 19, No. 6, 11.1994, p. 211-216.

Research output: Contribution to journalArticle

Pierpont, WF, Gray, SE, Hermesch, CB & Hilton, TT 1994, 'The effect of various bases on the fracture resistance of amalgam.', Operative Dentistry, vol. 19, no. 6, pp. 211-216.
Pierpont, W. F. ; Gray, S. E. ; Hermesch, C. B. ; Hilton, Thomas (Tom). / The effect of various bases on the fracture resistance of amalgam. In: Operative Dentistry. 1994 ; Vol. 19, No. 6. pp. 211-216.
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