Volume 26, Number 2 (5-2013)                   jdm 2013, 26(2): 91-98 | Back to browse issues page


XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Mohammdi Basir M, Tabatabai Ghomsheh E, Azari A, Malek Hosseini Z, Vahdati Far M. Effect of amalgam cuspal coverage on the fracture resistance of endodontically treated teeth. jdm. 2013; 26 (2) :91-98
URL: http://jdm.tums.ac.ir/article-1-5010-en.html

Abstract:   (10195 Views)

Background and Aims: Endodontically treated teeth are prone to fracture because they loose a big amount of their structure. The treatment plan of those teeth is completed when they are rehabilitated with a strong and functional restoration. The purpose of this study was to evaluate the fracture resistance of endodontically treated teeth restored with amalgam cuspal coverage in comparison with other restorative techniques.

Materials and Methods: 40 human healthy maxillary premolars were divided into 4 groups: group1 (S): sound teeth, group 2(Co): endodontically treated teeth with MOD cavity restored with bonding and composite, group 3(Am-B): endodontically treated teeth with MOD cavity restored with bonding and amalgam and group 4 (Am-CC): endodontically treated teeth with MOD cavity restored with amalgam cuspal coverage. Then the restorations were stored in water and room temperature for 100 days at then thermocycled for 500 cycles between water baths at (5.5 ± 1) and (55 ± 1) 0 C. The fracture resistance was evaluated by universal testing machine (Instron, 1195 UK) with the compressive force of about 2000 N in 0.5 mm/min. The fracture modes were evaluated in four groups by a stereomicroscope. Statistical analysis (Scheffe test) was done for all groups (P<0.05 was considered as the level of meaningfulness).

Results: The highest fracture resistance was found in group 4 (Am-CC) (976 ± 23.27 N) that had no significant difference with sound tooth (P>0.05). The lowest fracture resistance was found in group 2 (Co) (384 ± 137.4 N) that had no significant difference with group 3 (Am-B) (P>0.05). The fracture resistance in group 4 was significantly higher than group 2 (Co) and 3 (Am-B). The fracture mode in group 1 was cohesive within tooth and in group 2 (Co) and 3 (Am-B) was mixed cohesive and adhesive, and in group 4 was cohesive within in restorative material.

Conclusion: The highest fracture resistance was found in teeth that received amalgam cuspal coverage.

Full-Text [PDF 264 kb]   (1507 Downloads)    
Type of Study: Research | Subject: general
Received: 2013/03/1 | Accepted: 2013/05/26 | Published: 2013/09/14

Add your comments about this article : Your username or email:
Write the security code in the box

Send email to the article author


© 2017 All Rights Reserved | Journal of Dental Medicine

Designed & Developed by : Yektaweb