Objective: The curing depth of light curing composite resins is affected by variables related to the composite material as well as the curing light. The objective of this study was to determine the effect on the curing depth of different shades of a composite when irradiated at different distances. Methods: Hundred and twenty Ceram•X mono (Dentsply) (shades A1, A3 and A4) specimens were prepared in a stainless mould (6 mm high with a central cavity of 4 mm in diameter). The composite was placed inside the cavity and covered on both sides with Mylar strips and glass plates. Finger pressure was applied to remove the access resin. The resin specimens were cured through air from one side with a Satelec Mini LED (800 mW/cm2) for 10 sec at distances of 0, 2, 5 and 8 mm. The curing depth was determined by means of a penetrometer and the thickness of the layer of hardened resin was recorded in mm. Significant differences were determined by pair-wise comparisons of mean curing depths using the ANOVA statistical test (p≤0,05). Results: The mean curing depths for the curing distances 0, 2, 5, and 8 mm were: A1: 3,586, 3,157, 2,511, 1,778; A3: 3,279, 2,715, 2,211, 1,656; A4: 3,038, 2,426, 1,762, 1,532. The curing depths for each of the three shades were significantly different for each of the curing distances (p≤0,05). Conclusions: Regardless of the shade of the composite the curing depth was reduced by curing distances larger than 0,0 mm.
Division: South African Division
Meeting:2006 South African Division (Midrand, South Africa) Location: Midrand, South Africa
Year: 2006 Final Presentation ID: Abstract Category|Abstract Category(s):Scientific Groups
Authors
Thusi, Cs
( University of Limpopo (Medunsa campus), Medunsa, N/A, South Africa
)
Du Preez, Ic
( University of Limpopo (Medunsa campus), Medunsa, N/A, South Africa
)
Oberholzer, Tg
( University of Limpopo (Medunsa campus), Medunsa, N/A, South Africa
)