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An in vitro comparison of the fracture resistance of MOD inlay restorations using different lithium disilicates
Mohammed Junaid Mulla1, Shishir Singh1, Gaurav Kulkarni1
1Department of Conservative Dentistry and Endodontics, TPCT's Terna Dental College and Hospital, Mumbai, Maharashtra, India.
Objective:
The objective of this study was to evaluate and compare the fracture resistance of MOD inlay preparations restored with two different lithium disilicate glass ceramics.
Materials And Methods:
Standardized MOD inlay cavities were prepared on 64 human permanent premolar teeth and divided into two groups to be restored with lithium disilicate glass-ceramic materials, i.e. Group I with IPS e.max Press HT and Group II with Shofu Vintage LD Press T. The fracture resistance was assessed using a universal testing machine and recorded in Newtons (N). Statistical analysis was done using SPSS software (Version 17.0, IBM, USA). P <0.05 was set as a statistically significant level. Unpaired Student's t-test was used to compare the fracture resistance values of both groups.
Results:
The mean fracture resistance value obtained for Group I (IPS e.max Press HT) was 565.04 N while that obtained for Group II was 732.75 N. Statistically significant difference was found in this intergroup comparison (P = 0.002).
Conclusion:
The fracture resistance of MOD inlay preparations restored with Vintage LD Press T (Shofu) was significantly higher than those restored with IPS e.max Press HT (Ivoclar Vivadent).
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