Objective
To compare color change magnitude of an infiltrative resin and a flowable composite resin after immersion in commonly consumed beverages.
Materials and Methods
Disks (1 × 9 mm) of a flowable composite (Filtek Supreme Ultra Flowable) and a resin‐infiltrative product (Icon) were made. Specimens were dark‐stored in tap water (24 hours). Baseline color parameters (CIE L*a*b*) were obtained using a colorimeter (Easyshade V4, VITA). Specimens were immersed (dark stored, 37°C, 1 week) in commercial beverages: Kool‐Aid, coffee, Coca‐Cola, and tap water (control). ΔE00 between final and baseline conditions for each material/beverage combination was determined (N = 10/group). Initial analysis of variance indicated significant impact of major factors/interactions on ΔE00. Subsequently, t‐tests between ΔE00 values of restorative materials within each beverage was performed: alpha 0.05.
Results
Kool‐Aid produced the greatest color change for flowable composite, with a ΔE00 significantly greater than the infiltrative product. No significant ΔE00 differences were noted between products immersed in coffee, however color parameters causing these differences were not similar. Water or Coca‐Cola immersion showed lowest ΔE00 values for both materials, considered visually imperceptible: ΔE00 values <0.8.
Conclusions
Color change potential of infiltrative resin or resin composite was highly dependent on beverage type, with no general trends observed in which material was affected more.
Clinical Significance
Staining potential of an infiltrative restorative resin differs from that of a filled, flowable composite material on a beverage‐by‐beverage basis. The potential for color change seems not related to the presence or absence of fillers in the restorative material.
Sublethal plasma membrane disruption (PMD) is an established mechanism for signaling in several cell types, including endothelial cells and skeletal muscle. We used a rat model of orthodontic tooth movement to test the hypothesis that periodontal ligament (PDL) cells communicate stretch to changes in bone cell activity in part via PMD. To produce PMD, we used a 50-g load from a spring activated in the buccal direction against the maxillary first molars for 5 min. Uptake of endogenous serum albumin was used as a PMD marker. Immunohistochemistry demonstrates albumin in PDL cells surrounding moved first molar tips. Image analysis shows significantly more albumin in cells of the buccal side (tension) of the moved teeth compared with those of the lingual, distal, and mesial sides, and those of the unmoved control. Albumin localization within cells of the PDL, after only 5 min of mechanical loading, suggests that PMD could promote uptake or release of signaling molecules.
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