Scholarlink

Background <p>Clear thermoplastic orthodontic aligners are widely used due to their aesthetic appeal and patient comfort; however, exposure to chemically diverse intraoral environments may compromise their physical, aesthetic, and chemical stability. This study aimed to evaluate the effect of acidic, alkaline, and neutral chemical environments on weight variation, pH interaction, colour stability, and leaching behaviour of thermoplastic orthodontic aligner materials.</p> Methods <p>Thirty maxillary thermoplastic orthodontic aligners representing three commercial materials (Erkodur, Duran, and Zendura) were immersed in acidic (lime juice), alkaline (ENO<sup>®</sup> solution), or neutral (artificial saliva) media for 14 days at 37&#xa0;°C. Assessments were performed at Day 0, Day 7, and Day 14. Weight changes, pH variation, colour stability (ΔE, CIE L<i>a</i>b* using ImageJ and VITA Easyshade), and leaching behaviour (UV-Visible spectrophotometry) were analysed using repeated-measures and one-way ANOVA.</p> Results <p>Aligners in acidic media exhibited the greatest weight reduction (3.410 ± 0.015&#xa0;g to 3.358 ± 0.025&#xa0;g; <i>p</i> &lt; 0.001), followed by alkaline media. Colour change was highest in acidic conditions (ΔE = 3.08 ± 0.15), moderate in alkaline (1.92 ± 0.12), and minimal in neutral media (0.77 ± 0.08). Leaching absorbance was significantly higher in acidic media at Day 14 (0.083 ± 0.004 AU; <i>p</i> &lt; 0.001).</p> Conclusion <p>Oral chemical exposures significantly compromise the physicochemical and aesthetic properties of thermoplastic aligners, highlighting the need for careful material selection, patient guidance, and further in vivo studies to confirm clinical impact.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Influence of varying oral pH conditions on the material stability of thermoplastic orthodontic aligners: an in vitro study

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年5月15日

查看全文
  • Dhruv Ahuja,
  • Bhawna Negi,
  • Anjana Goyal,
  • Puneet Batra,
  • Ashith MV,
  • Kumar Rakshak Anand,
  • Khushi Gupta,
  • Bhoomi Pitanjali Singh,
  • Areeba Parvez

摘要

Background

Clear thermoplastic orthodontic aligners are widely used due to their aesthetic appeal and patient comfort; however, exposure to chemically diverse intraoral environments may compromise their physical, aesthetic, and chemical stability. This study aimed to evaluate the effect of acidic, alkaline, and neutral chemical environments on weight variation, pH interaction, colour stability, and leaching behaviour of thermoplastic orthodontic aligner materials.

Methods

Thirty maxillary thermoplastic orthodontic aligners representing three commercial materials (Erkodur, Duran, and Zendura) were immersed in acidic (lime juice), alkaline (ENO® solution), or neutral (artificial saliva) media for 14 days at 37 °C. Assessments were performed at Day 0, Day 7, and Day 14. Weight changes, pH variation, colour stability (ΔE, CIE Lab* using ImageJ and VITA Easyshade), and leaching behaviour (UV-Visible spectrophotometry) were analysed using repeated-measures and one-way ANOVA.

Results

Aligners in acidic media exhibited the greatest weight reduction (3.410 ± 0.015 g to 3.358 ± 0.025 g; p < 0.001), followed by alkaline media. Colour change was highest in acidic conditions (ΔE = 3.08 ± 0.15), moderate in alkaline (1.92 ± 0.12), and minimal in neutral media (0.77 ± 0.08). Leaching absorbance was significantly higher in acidic media at Day 14 (0.083 ± 0.004 AU; p < 0.001).

Conclusion

Oral chemical exposures significantly compromise the physicochemical and aesthetic properties of thermoplastic aligners, highlighting the need for careful material selection, patient guidance, and further in vivo studies to confirm clinical impact.