IADR Abstract Archives
Effect of Dental Headlamp and Blue-Blocker on Pre-mature Composite Curing
Objectives: To compare pre-mature polymerization times of among a variety of commercial composites exposed to a dental headlamp with or without Blue-Blocker (BB) filter present.
Methods: Thin (≈0.1mm) specimens of uncured commercial conventional composite (CQ-containing shades A2/Bleach (Premise, Kerr); CQ-TPO-containing Tetric shades A2/Bleach (Tetric Ceram, Ivoclar) or flowable composite (CQ-containing shades A2/Bleach (Premise Flowable, Kerr); CQ-TPO-containing Tetric EvoFlow shades A2/Bleach) were placed on the diamond element of a temperature-controlled (30°C) ATR stage of an FTIR spectrometer. Specimens were exposed to an LED-based dental headlamp (RADBL23, Q-optics (at 16”)) for 80s. Real-time infrared spectra were obtained (1 scan/s, resolution 2 cm-1), from which monomer conversion values were determined. N=5/group, specimens were made in randomized order. The time at which specimens first demonstrated measurable conversion was noted and compared within either the presence or absence of the BB filter among composite types, initiator content, and shades, using 3-way ANOVAs. T-tests compared onset times of the same material between BB presence/absence. Pre-set alpha was 0.05.
Results: Table presents results. All factors for the 3-WAY ANOVAs, and their interaction terms, demonstrated significant influence on onset time (p<0.001). Thus, 1-WAY ANOVAs among pooled groups within the presence/absence of the BB filter were performed. No detectable cure (>80s) was noted for any specimen when exposed using the BB filter, as well as for the Conv CQ/TPO bleach shade without BB. Without using the BB filter, onset times occurred sooner for the flowable composite than the conventional equivalent for both initiator types as well as both shades.
Conclusions: Blue-Blocker use while illuminating an active operatory field using a dental headlamp effectively precludes pre-mature curing of a wide variety of composite types. If the BB filter is not used, flowable composites tend to show earlier onset of premature curing than did their conventional composite equivalents.
Methods: Thin (≈0.1mm) specimens of uncured commercial conventional composite (CQ-containing shades A2/Bleach (Premise, Kerr); CQ-TPO-containing Tetric shades A2/Bleach (Tetric Ceram, Ivoclar) or flowable composite (CQ-containing shades A2/Bleach (Premise Flowable, Kerr); CQ-TPO-containing Tetric EvoFlow shades A2/Bleach) were placed on the diamond element of a temperature-controlled (30°C) ATR stage of an FTIR spectrometer. Specimens were exposed to an LED-based dental headlamp (RADBL23, Q-optics (at 16”)) for 80s. Real-time infrared spectra were obtained (1 scan/s, resolution 2 cm-1), from which monomer conversion values were determined. N=5/group, specimens were made in randomized order. The time at which specimens first demonstrated measurable conversion was noted and compared within either the presence or absence of the BB filter among composite types, initiator content, and shades, using 3-way ANOVAs. T-tests compared onset times of the same material between BB presence/absence. Pre-set alpha was 0.05.
Results: Table presents results. All factors for the 3-WAY ANOVAs, and their interaction terms, demonstrated significant influence on onset time (p<0.001). Thus, 1-WAY ANOVAs among pooled groups within the presence/absence of the BB filter were performed. No detectable cure (>80s) was noted for any specimen when exposed using the BB filter, as well as for the Conv CQ/TPO bleach shade without BB. Without using the BB filter, onset times occurred sooner for the flowable composite than the conventional equivalent for both initiator types as well as both shades.
Conclusions: Blue-Blocker use while illuminating an active operatory field using a dental headlamp effectively precludes pre-mature curing of a wide variety of composite types. If the BB filter is not used, flowable composites tend to show earlier onset of premature curing than did their conventional composite equivalents.