Abstract
The aim of this study is to evaluate the crown discoloration induced by bioceramic root canal filling materials (OrthoMTA and iRoot SP) compared to AH Plus. Material and Methods: Sixty intact mandibular single rooted premolars were sectioned 2 mm below the cemento-enamel junction, prepared, and randomly assigned into four groups according to the root filling materials: OrthoMTA, iRoot SP, AH Plus and unfilled.Results: Before placement of the materials in the pulp chamber and the coronal third of the root, the spectral reflectance lines of the crowns were recorded by a digital spectrophotometer at baseline, and after filling at 1 week and 1, 3 and 6 months and ∆Ε values were calculated. All materials used induced clinically perceptible crown discoloration (ΔΕ>3.7) and no significant difference was detected between these materials (p>0.05). Regardless of the material, discoloration progressed significantly within the three months (p<0.05) however, at 6months, the discoloration reduced for AH Plus and no further increase for bioceramic materials was detected. Conclusion: Bioceramic root filling materials tested induced clinically perceptible crown discoloration and their application in the esthetic zone should be performed with caution.
Highlights
Discoloration of teeth is an esthetic problem that often requires prompt corrective measures for the patient’s satisfaction.[1]
There are many etiological factors for tooth discoloration, yet the incomplete removal of the obturation materials from the pulp chamber and penetration of the sealers into dentinal tubules are considered the main reasons for local intrinsic staining of the crown.[2,3]
At T2, T3 and T4 all materials induced clinically perceptible crown discoloration (ΔΕ>3.7) that was significant progress compared to T1 (p
Summary
Discoloration of teeth is an esthetic problem that often requires prompt corrective measures for the patient’s satisfaction.[1] There are many etiological factors for tooth discoloration, yet the incomplete removal of the obturation materials from the pulp chamber and penetration of the sealers into dentinal tubules are considered the main reasons for local intrinsic staining of the crown.[2,3] Materials include bismuth oxide as radioopacifier,[4,5] and other heavy metal oxides such as iron, aluminum, and magnesium oxides that induce discoloration.[6] These components interact with dentin and change light-transmitting along with reflecting properties of the dentinal structures that produce an alteration in crown outward appearance.[7]. Sealer remnants cannot be always thoroughly removed from the pulp chamber with limited visualization or shade resemblance of the material to root dentin.[8,9] using materials that do not contain discolorationinduced constituents could result in better esthetic outcomes
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