CERVICAL MICROLEAKAGE IN CLASS II SNOWPLOW RESTORATIONS: COMPARISON OF DIFFERENT CURING MODES: AN IN VITRO STUDY

Dr. Laxmikant Kamatagi, Dr. Naveen Chabbra, Dr Shruti Mutsaddi, Dr Shrishail Indi

Abstract


 The aim of the study was to evaluate the effect of curing modes on the cervical microleakage of snowplow restorations done with two different types of composite.

Materials and methods:  Standardized Class II box only cavities were prepared on either of the proximal surfaces of forty intact extracted. All samples were randomly divided into four groups (n = 10). Group 1 Tetric N ceram continuous polymerization (TNC CP): teeth were restored with snowplow procedure using Tetric‑N‑cerem (Ivoclar–Vivadent) and Tetric‑N‑flow and cured with continuous polynerization for 15 s; Group 2 (TNC SSP): restorations done same as Group 1 but cured with soft start polymerization for 20 s; Group 3 (Beautifil CP): teeth were restored with snowplow procedure using Beautifil II (Shofu, Kyoto, Japan) and Beautifil II Flow 02 (Shofu, Kyoto, Japan) and cured for 15 s; Group 4 (Beautifil SSP): restorations done same as Group 3 but cured with soft start polymerization for 20 s. After staining with 2% methylene blue solution, each tooth was sectioned mesiodistally with diamond disc and examined under stereomicroscope (Magnification 4 × 40) (Lawrance and Mayo) for the evaluation of dye infiltration. The extent of microleakage was scored using the ISO microleakage scoring system.

Results: TNC SSP group showed significantly less microleakage than TNC CP group. Between Beautifil CP and Beautiful SSPs, there was no significant difference in the microleakage. Conclusion: Soft start polymerization significantly reduced the microleakage in snowplow restorations done with TNC composite, but it is insignificant in the Beautifil II composite


Keywords


Beautifil II, Microleakage, Soft start polymerization, TNC composite

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