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Paper Information

Journal:   JOURNAL OF MASHHAD DENTAL SCHOOL   WINTER 2008 , Volume 31 , Number 4 (63); Page(s) 321 To 328.
 
Paper: 

EFFECT OF CAVITY WALL THICKNESS ON FRACTURE STRENGTH OF PULPOTOMIZED PRIMARY MOLAR TEETH WITH CLASS II AMALGAM RESTORATION

 
 
Author(s):  MAZHARI F.*, MEHRABKHANI M., GHAREHCHAHI M.
 
* DEPT. OF PEDIATRIC DENTISTRY, SCHOOL OF DENTISTRY AND DENTAL RESEARCH CENTER OF MASHHAD UNIVERSITY OF MEDICAL SCIENCES, MASHHAD, IRAN
 
Abstract: 

Introduction: Loss of tooth structure due to dental caries and cavity preparation can reduce fracture resistance, especially for endodontically treated teeth. The aim of this study was to assess the fracture resistance of pulpotomized primary molar teeth with class 11amalgam restorations.
Materials & Methods: In this invitro experimental study, 80 carious human extracted primary molar teeth (40 first molars and 40 second molars) were selected for pulpotomy preparation. The teeth were divided into four groups. Mesioor disto-occlusal (20 teeth) and Mesio-occluso-distal (20 teeth) cavities were prepared in both first and second primary molarteeth. Each group was divided into two subgroups with 10 teeth in each, according to thickness of the remaining walls (1.5 or 2.5mm).After restoring teeth with amalgam, all groups were stored in distilled water at 37oc for 7 days.
They were then thermocycled for 1000 times 5oc to 55oc. Finally, the specimens were subjected to a compressive axial load in a universal testing machine (Zwick) at a crosshead speed of 0.5mm/min and fracture resistances of teeth were calculated in Newton. T-test was used for statistical analysis.
Results: Mean fracture resistances of first and second molar teeth were 975±368.8 N and 1049±540.1 N respectively.
In the first molar teeth, fracture resistance of two-surface cavities was significantly greater than three-surface ones (P<0.001), but the difference was not statistically significant in second molars. In the second molar teeth, the fracture strength of cavities with 2.5mm wall thickness was greater than 1.5mm thickness walls in both two (P=0.001) and three surface cavities (0.015) but in first molars, this difference was significant only in the three surface cavities (P=0.045).
Conclusion: The fracture strength in pulpotomized primary molar teeth with amalgam restorations was high (more than maximum bite force in primary teeth) even in extensive 3-surface ones. Therefore, the teeth with large proximal carious lesions in school children can be restored with amalgam instead of Stainless steel (ss) crown.

 
Keyword(s): CAVITY WALL THICKNESS, FRACTURE STRENGTH, PULPOTOMIZED PRIMARY MOLAR TEETH, AMALGAM RESTORATION
 
References: 
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