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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

July/August 2011
Volume 42 , Issue 7

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Fracture Resistance Of Maxillary Premolars With Class II MOD Cavities Restored With Ormocer, Nanofilled, And Nanoceramic Composite Restorative Systems

Dina Gamal Taha, BDS/Abdou Abdel-Fatah Abdel-Samad, PhD/Salah Hasab Mahmoud, PhD

Pages: 579587
PMID: 21716986

Objective: To assess the influence of ormocer, nanofilled, nanoceramic, and microhybrid composite restorative systems on the fracture resistance of maxillary premolars with Class II mesio-occlusodistal (MOD) cavities. Method and Materials: Eighty-four sound maxillary human premolars were divided into six groups of 14 teeth each. Teeth in the first group were left intact and tested as unprepared positive controls. Teeth in the remaining five groups were prepared with MOD cavities. Teeth in one of the five groups were unrestored and tested as negative control. The remaining four groups were restored with an ormocer (Admira), a nanofilled composite (Filtek Supreme), a nanoceramic composite (CeramX mono), and a microhybrid composite (Tetric Ceram). All groups were stored in water at 37C for 24 hours and thermocycled 500 times between 5C and 55C. The specimens were loaded occlusally in a universal testing machine using a metal sphere that contacted only the teeth on the cuspal inclines until fracture occurred. The results were analyzed by Kruskal-Wallis and Mann-Whitney U tests. The level of significance was set at .05. Results: The difference between the mean cuspal fracture resistance of the unprepared positive control teeth and those restored with ormocer, nanofill, and microhybrid composite was found to be statistically significant (P < .05). No statistically significant difference in cuspal fracture resistance was found between the unprepared positive control teeth and those teeth restored with nanoceramic composite (P > .05). Conclusion: Under compressive load testing, teeth with microhybrid, ormocer, and nanofilled composite restorations had lower cuspal fracture resistance than those with nanoceramic composite restorations. (Quintessence Int 2011;42:579587)

Key words: fracture resistance, maxillary premolars, nanoceramic composite, nanofilled composite, ormocer

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