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ORIGINAL ARTICLE
Year : 2008  |  Volume : 8  |  Issue : 4  |  Page : 201-206

Comparison of two types of ceromer molar crowns on their fracture resistance: An in-vitro study


Department of Prosthodontics, Shiraz University of Medical Sciences, Shiraz, Iran

Correspondence Address:
Shabnam Ajami
Orthodontic Department, Dental School, Shiraz University of Medical Sciences, Shiraz
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-4052.49183

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GC Gradia and Signum+ are two different types of ceromer available for clinical use in the last few years. They showed an excellent esthetic and clinical success; however, their fracture strength needed further investigation. The aim of this study was to compare the fracture resistance of these two ceromers in a situation that simulates clinical conditions. Twenty extracted human mandibular molars, similar in their dimensions, were selected and prepared. After tooth preparation, impressions were taken and casts were made. Ten molar crowns were fabricated with GC Gradia and the other 10 molar crowns were made of Signum+ at random. All the molar crowns were luted on human molars with a resin cement named Dual-Cement. After all samples were thermally cycled, they were loaded mechanically to fracture using a universal testing machine (Instron). At the fracture moment, data were registered. Statistical analysis was performed and the results showed that the fracture resistance of GC Gradia (2652/75511N) is higher than Signum+ (2106/09304N). A Mann-Whitney test showed statistically significant differences between the two systems ( P = 0.029). Since both systems exceeded the fracture strength required to withstand the maximum masticatory force in the molar region, they can be used to fabricate single molar crowns, but probably GC Gradia can be used with more confidence in the clinic.


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