A comparative evaluation of microleakage of restorations using silorane-based dental composite and methacrylate-based dental composites in Class II cavities: Anin vitrostudy.
OBJECTIVE
The aim of thisin vitrostudy was to evaluate and compare the microleakage of restorations using low shrinkage silorane-based dental composite and methacrylate-based dental composites in Class II cavity at the occlusal and gingival margins.


METHODS
Sixty mandibular molars were collected and divided into three experimental groups and one negative control group. Class II slot cavity was prepared on the mesial surface. Experimental groups were restored with Group I: silorane-based microhybrid composite, Group II: methacrylate-based nanohybrid composite, and Group III: Methacrylate-based microhybrid composite, respectively. Group IV: negative control. The samples were thermocycled, root apices were sealed with sticky wax and coated with nail varnish except 1 mm around the restoration. This was followed by immersion in 2% Rhodamine-B dye solution under vacuum at room temperature for 24 h. Then, the samples were sectioned longitudinally in the mesiodistal direction and evaluated under stereomicroscope ×40 magnification. Scoring was done according to the depth of dye penetration in to the cavity. Statistical analysis of the data was done.


RESULTS
The results were that no statistically significant difference in the microleakage at the occlusal margin for all the restorative materials, whereas at the gingival margin, silorane-based microhybrid composite showed less microleakage than the methacrylate-based nano- and micro-hybrid composites.


CONCLUSIONS
In general, silorane-based microhybrid composite had less microleakage among the other materials used in thisin vitrostudy.
Department of Conservative Dentistry and Endodontics, Vivekananda Dental College for Women, Tiruchengode, Tamil Nadu, India.
Jambai Sampath Kumar
JS
Sivakumar
Department of Conservative Dentistry and Endodontics, Vivekananda Dental College for Women, Tiruchengode, Tamil Nadu, India.
A S
AS
Prasad
Department of Conservative Dentistry and Endodontics, Vivekananda Dental College for Women, Tiruchengode, Tamil Nadu, India.
Saravanapriyan
S
Soundappan
Department of Conservative Dentistry and Endodontics, JKKN Dental College and Hospital, Komarapalayam, Tamil Nadu, India.
N
N
Ragavendran
Department of Prosthodontics, Vivekananda Dental College for Women, Tiruchengode, Tamil Nadu, India.
R
R
Ajay
Department of Pedodontics, Sathyabama Dental College, Tamil Nadu, India.
Krishnamoorthy
K
Santham
Composite; methacrylate; microleakage; polymerization shrinkage; silorane