IADR Abstract Archives
Resin-based Composite Colour Change Caused By Cigarette Or Heat-not-Burn Exposure
Objectives: Cigarette smoke is known to stain resin-based composites (RBCs). The objective of this work was to establish whether the newer heat-not-burn (HnB) tobacco products produce similar staining in RBCs.
Methods: Disc-shaped(12x3mm) specimens were made from three RBCs based on the same monomers but with different resin concentrations (Table 1) polymerised for 20s on the top and bottom surfaces using an LED curing-unit (520 mW/cm2, Smartlite, Dentsply). Specimens were exposed to 5 days of 110 puffs per day (55mL per puff) of either air (as a control), cigarette smoke (3R4F research cigarette, University of Kentucky) or HnB (IQOS, Philip Morris International) using a smoking/vaping machine (Gram Research). Colour was measured via the CIE system using a spectrophotometer (Ci6XS, Xrite). Specimens were measured at baseline and then daily after removal from the vaping machine. Colour change (DE) was calculated each day and data were analysed using three-way ANOVA with Tukey’s post-hoc test.
Results: Both cigarette and HnB exposure produced a colour change in all materials from the day-1, which increased up to day-5. For cigarettes this increase was significant from day-1 and increased gradually thereafter (P<0.05 or lower at all times). For HnB exposure, the colour change was more gradual only becoming significant on day-5 compared to baseline (P<0.05). No significant colour change occurred after air exposure on any day for any material.
As the resin concentration increased in the RBCs there was a increase in colour change after cigarette and HnB exposure, with the GrandioSO (11% resin) specimens always having significantly lower colour change compared to the GrandioSo Flow (17% resin) and GrandioSO Heavy-Flow (19% resin) specimens (P<0.05).
Conclusions: Although they do not lead to a colour change as significant as cigarette exposure, the heat-not-burn products are still liable to lead to staining of composite restoration.
Methods: Disc-shaped(12x3mm) specimens were made from three RBCs based on the same monomers but with different resin concentrations (Table 1) polymerised for 20s on the top and bottom surfaces using an LED curing-unit (520 mW/cm2, Smartlite, Dentsply). Specimens were exposed to 5 days of 110 puffs per day (55mL per puff) of either air (as a control), cigarette smoke (3R4F research cigarette, University of Kentucky) or HnB (IQOS, Philip Morris International) using a smoking/vaping machine (Gram Research). Colour was measured via the CIE system using a spectrophotometer (Ci6XS, Xrite). Specimens were measured at baseline and then daily after removal from the vaping machine. Colour change (DE) was calculated each day and data were analysed using three-way ANOVA with Tukey’s post-hoc test.
Results: Both cigarette and HnB exposure produced a colour change in all materials from the day-1, which increased up to day-5. For cigarettes this increase was significant from day-1 and increased gradually thereafter (P<0.05 or lower at all times). For HnB exposure, the colour change was more gradual only becoming significant on day-5 compared to baseline (P<0.05). No significant colour change occurred after air exposure on any day for any material.
As the resin concentration increased in the RBCs there was a increase in colour change after cigarette and HnB exposure, with the GrandioSO (11% resin) specimens always having significantly lower colour change compared to the GrandioSo Flow (17% resin) and GrandioSO Heavy-Flow (19% resin) specimens (P<0.05).
Conclusions: Although they do not lead to a colour change as significant as cigarette exposure, the heat-not-burn products are still liable to lead to staining of composite restoration.