Abstract
Aim This study aimed to evaluate the effects of various restorative techniques on the fracture resistance of pulpotomized premolars with mesioocclusodistal (MOD) cavities treated with mineral trioxide aggregate (MTA) or calcium enriched mixture (CEM) cement. Materials and Methods One hundred and eight sound extracted maxillary premolars were randomly assigned to nine experimental groups (n = 12). The teeth in group 1 did not receive any preparation. Class II MOD cavities were prepared in the other experimental groups. In groups 2, 4, 6, and 8, tooth-colored MTA was used for pulpotomy. In groups 3, 5, 7, and 9, CEM cement was used for pulpotomy. Groups 2 and 3 were left unrestored. Groups 4 and 5 were restored with amalgam. Groups 6 and 7 were restored with a conventional composite resin, and groups 8 and 9 were restored with bulk-fill giomers. Fracture resistance was measured, the fracture pattern of each specimen was assessed, and the results were statistically analyzed. Results The fracture resistance of group 1 was significantly higher than those of the other groups (p < 0.05). The fracture resistance of group 2 (MTA + amalgam) was statistically lower than those of all experimental groups (p values < 0.05) except groups 3, 4, and 5 (p values > 0.05). No statistically significant differences were found between the groups restored with amalgam, conventional composite resin, and bulk-fill giomer (groups 4, 5, 6, 7, 8, and 9) (p values < 0.05). The highest rate of mode 1 fracture (restorable fracture) was observed in group 1 followed by groups 8 and 9. Conclusion No significant differences were found among the fracture resistances of the restored teeth using various restorative techniques. Bulk-fill giomers followed by conventional composite resin were better able to prevent unfavorable fractures compared to amalgam. Therefore, they seem to be more reliable for the restoration of pulpotomized teeth with MOD cavities.
Highlights
An important biological and clinical challenge in immature permanent teeth is to preserve dental pulp [1]
To the best of the authors’ knowledge, there are no published data about the fracture resistance of permanent teeth pulpotomized with mineral trioxide aggregate (MTA) and calcium enriched mixture (CEM) cement and restored with different restorative techniques. erefore, this study aimed to evaluate the fracture resistance of pulpotomized premolars with MOD cavities restored with various restorative techniques
An appropriate restorative technique which ensures the tooth function, maintains the tooth structure against fracture, and meets the aesthetic needs of the patients should be selected [18]. e results of this study showed that the fracture resistance of the pulpotomized teeth was lower than that of the intact teeth which is due to the loss of tooth structure in pulpotomized teeth. is result is in line with previous studies which demonstrated that the fracture resistance of the teeth decreased after cavity preparation [18, 19]
Summary
Yasamin Ghahramani ,1 Fereshteh Shafiei ,2 Zahra Jowkar ,2 and Sepideh Kazemian. Received 14 February 2021; Revised 4 April 2021; Accepted 3 May 2021; Published 10 May 2021. Aim. is study aimed to evaluate the effects of various restorative techniques on the fracture resistance of pulpotomized premolars with mesioocclusodistal (MOD) cavities treated with mineral trioxide aggregate (MTA) or calcium enriched mixture (CEM) cement. Class II MOD cavities were prepared in the other experimental groups. Groups 4 and 5 were restored with amalgam. Groups 6 and 7 were restored with a conventional composite resin, and groups 8 and 9 were restored with bulk-fill giomers. E fracture resistance of group 2 (MTA + amalgam) was statistically lower than those of all experimental groups (p values < 0.05) except groups 3, 4, and 5 (p values > 0.05). No statistically significant differences were found between the groups restored with amalgam, conventional composite resin, and bulk-fill giomer (groups 4, 5, 6, 7, 8, and 9) (p values < 0.05). No statistically significant differences were found between the groups restored with amalgam, conventional composite resin, and bulk-fill giomer (groups 4, 5, 6, 7, 8, and 9) (p values < 0.05). e highest rate of mode 1 fracture (restorable fracture) was observed in group 1 followed by groups 8 and
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