Dental and composite resin discoloration induced by different hydraulic calcium silicate-based cements: two-year in vitro assessment

Abstract

Few long-term studies assess the discoloration induced by hydraulic calcium silicate-based cement on dental structures. In addition, as far as we know, no long-term study has assessed the discoloration induced by these cement on composite resin. Objective This in vitro study aimed to assess, during a period of two years, the discoloration potential of different hydraulic calcium silicate-based cements (hCSCs) on the enamel/dentin structure and composite resin restoration. Methodology A total of 40 enamel/dentin discs were obtained from bovine incisors, and 40 composite resin discs (10 mm in diameter × 2 mm thick) were fabricated. A 0.8 mm-deep cavity was made in the center of each disc and filled with the following hCSCs (n=10): Original MTA (Angelus); MTA Repair HP (Angelus); NeoMTA Plus (Avalon); and Biodentine (Septodont). An initial color measurement was performed (T0 - baseline). After 7, 15, 30, 45, 90, 300 days, and two years, new color measurements were performed to determine the color (ΔE00), lightness (ΔL’), chroma (ΔC’), hue differences (ΔH’), and whiteness index (WID). Results For enamel/dentin, the ΔE00 was significant among groups and periods (p<0.05). NeoMTA Plus had the greatest ΔE00. The NeoMTA Plus group had the greatest ΔE00 after two years for composite resin. Significant reduction in lightness was observed for all groups after two years (p<0.05). The most significant WID values were observed after 30 days for Biodentine (enamel/dentin) and MTA Repair HP groups (composite resin) (p<0.05). Conclusions The hCSCs changed the colorimetric behavior of both substrates, leading to greater darkening over time. The Bi 2 O 3 in the Original MTA seems relevant in the short periods of color change assessment.

Preventive Effects of Laser Irradiation and Dentin Bonding Agent Application on Tooth Discoloration Induced by Mineral Trioxide Aggregate

“…The alteration of certain key parameters in the study could have led to variations in the results, which is the limitation of the present study. The teeth allocations of each group were conducted based on the previous studies [24,39]. According to this, an equal number of color tones were distributed to each group based on colors A2, B1, B2, and A3.…”

“…To ensure an equitable distribution of teeth for each experimental group, a spectrophotometer device (VITA Easyshade Advance 4.0, VITA Zahnfabrik, Germany) was used to measure initial color values before the experiment, thus calibrating the groups. An equal number of color tones were distributed to each group (three teeth, color A2; two teeth, color B1; two teeth, color B2; and three teeth, color A3 in the same experimental group) [24]. Teeth were placed against an absolute white background (standard calibration tile according to Commission Internationale de l'Éclairage [CIE] L*: 93.84, a*: 1.48, b*: 3.76), and the central area of the buccal surface was subjected to color measurement.…”

The Efficacy of Different Laser Applications on Dentin Sealing in Preventing Discoloration Induced by Mineral Trioxide Aggregate

“…With the recording of initial L*a*b* data, tooth color reference values were also determined based on the VITA Classical shade guide and the VITA 3D Master scale guide. To ensure uniformity and prevent discrepancies both within and among the groups, the teeth were distributed evenly across the experimental groups: 4 teeth with an A2 shade, 2 teeth with a B2 shade, and 4 teeth with an A3 shade [ 7 , 17 ].…”

“…Nevertheless, in approximately 40% of RET cases, discoloration is observed due to the interaction between the blood clot—which is crucial for natural scaffold formation in the apical region—and the applied MTA [ 4 , 5 , 6 ]. The reasons for this tooth discoloration include not only blood–MTA contact but also the destabilization of bismuth oxide in contact with sodium hypochlorite [ 7 ]. These unacceptable color changes after dental treatments cause the treatment to be evaluated as esthetically unsuccessful.…”

“…While the literature contains many studies exploring color changes associated with regenerative endodontic treatments [ 3 , 7 , 17 , 18 , 19 , 20 ], there are exceedingly few studies that assess strategies for preventing such color changes [ 11 , 12 , 21 , 22 ]. The interaction of different laser applications with dentin may result in a decrease in discoloration.…”