Determining the Influence of Flowable Composite Resin Application on Cuspal Deflection Using a Computerized Modification of the Strain Gauge Method

Hamama, Hamdi H.; Zaghloul, Nadia M.; Abouelatta, Ossama B.; El-Embaby, Abeer E.
October 2011
American Journal of Esthetic Dentistry;Fall2011, Vol. 1 Issue 1, p48
Academic Journal
This study evaluated the influence of the application of flowable composite resin on cuspal deflection using a computerized modification of the strain gauge method. Forty sound extracted mandibular molars, which received a mesio-occlusodistal slot preparation, were divided into two groups of 20 molars each based on the type of restorative materials used. Each group was further divided into two subgroups of 10 molars each relative to the application of flowable composite resin at cavity internal line angles. Cuspal deflection was measured using a new computerized modification of the strain gauge method. The mean cuspal deflection values (�m/m) and standard deviations were calculated and subjected to normality and homogeneity of variances tests. If they passed the tests, they were subjected to parametric statistical analysis (independent sample t test). The results showed that groups containing flowable composite resin exhibited higher cuspal deflection values than groups without flowable composite resin. The application of flowable composite resin at the internal cavity line angles increased cuspal deflection, possibly due to the material's high volumetric shrinkage levels, which exerted more stress at the tooth-restoration interface. Further, the validity of the new computerized modification of the strain gauge method was proven by the agreement found between the output results and those of previous studies of cuspal deflection.


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