Scholarlink

Objectives <p>To evaluate the color improvement and stability of clear aligners after applying different hydrogen peroxide-containing and hydrogen peroxide-free cleaning protocols under simulated in-vitro conditions.</p> Materials and methods <p>Clear aligners (Invisalign, Align Technology, San Jose, CA, USA) were immersed in coffee for 7 days (<i>n</i> = 24). They were then subjected to cleaning with four different chemical solutions: hydrogen peroxide-free – Group 1: Invisalign Cleaning Crystals (Align Technology, San Jose, CA, USA) and Group 2: Aktident gel (Rego X-ray GmbH, Augsburg, Germany); hydrogen peroxide-containing – Group 3: Corega Proguard (Stafford-Miller Limited, Waterford, Ireland) and Group 4: Steradent Blancheur Pro (Reckitt Benckiser Healthcare Limited, Hull, UK). Specimens were exposed to the different solutions according to manufacturer’s instructions, followed by a second 7-day discoloration cycle. Color (ΔE*, L*, a*, b*) were assessed at baseline, after a 7-day coffee exposure, after cleaning, and after the second discoloration using a spectrophotometer (Vita Easyshade Compact Advance, VITA Zahnfabrik, Bad Säckingen, Germany). Surface alterations were qualitatively analyzed using a scanning electron microscope (SEM).</p> Results <p>After the initial discoloration, ΔE values significantly increased in all groups and decreased following cleaning (<i>p</i> &lt; 0.01), indicating partial color recovery. However, a subsequent restaining cycle caused a renewed increase in ΔE (<i>p</i> &lt; 0.05). Although no significant intergroup differences were detected (<i>p</i> &gt; 0.05), a significant intragroup difference between the first and second discoloration cycles was found in the peroxide-containing groups (Corega Proguard and Steradent Blancheur Pro) (<i>p</i> &lt; 0.05). A negative correlation between pH and ΔE₂ was observed in the peroxide-free group (<i>r</i> = − 0.64, <i>p</i> &lt; 0.05).</p> Conclusion <p>Although both hydrogen peroxide-containing and peroxide-free cleaning agents effectively reduce discoloration, variations in their pH and chemical composition influenced their efficacy. The differences in surface alterations among the cleaning agents highlight the need for a comprehensive assessment before recommending specific products to patients for aligner maintenance.</p> Clinical relevance <p>Clinicians should consider the chemical composition and pH of cleaning agents when advising patients on aligner maintenance to avoid unwanted surface or color alterations.</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

Color improvement and stability of orthodontic clear aligners following different cleaning protocols

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月10日

查看全文
  • Aslı Aşık,
  • Yağmur Lena Sezici,
  • Enver Yetkiner,
  • Arzu Aykut Yetkiner,
  • Nazan Ersin

摘要

Objectives

To evaluate the color improvement and stability of clear aligners after applying different hydrogen peroxide-containing and hydrogen peroxide-free cleaning protocols under simulated in-vitro conditions.

Materials and methods

Clear aligners (Invisalign, Align Technology, San Jose, CA, USA) were immersed in coffee for 7 days (n = 24). They were then subjected to cleaning with four different chemical solutions: hydrogen peroxide-free – Group 1: Invisalign Cleaning Crystals (Align Technology, San Jose, CA, USA) and Group 2: Aktident gel (Rego X-ray GmbH, Augsburg, Germany); hydrogen peroxide-containing – Group 3: Corega Proguard (Stafford-Miller Limited, Waterford, Ireland) and Group 4: Steradent Blancheur Pro (Reckitt Benckiser Healthcare Limited, Hull, UK). Specimens were exposed to the different solutions according to manufacturer’s instructions, followed by a second 7-day discoloration cycle. Color (ΔE*, L*, a*, b*) were assessed at baseline, after a 7-day coffee exposure, after cleaning, and after the second discoloration using a spectrophotometer (Vita Easyshade Compact Advance, VITA Zahnfabrik, Bad Säckingen, Germany). Surface alterations were qualitatively analyzed using a scanning electron microscope (SEM).

Results

After the initial discoloration, ΔE values significantly increased in all groups and decreased following cleaning (p < 0.01), indicating partial color recovery. However, a subsequent restaining cycle caused a renewed increase in ΔE (p < 0.05). Although no significant intergroup differences were detected (p > 0.05), a significant intragroup difference between the first and second discoloration cycles was found in the peroxide-containing groups (Corega Proguard and Steradent Blancheur Pro) (p < 0.05). A negative correlation between pH and ΔE₂ was observed in the peroxide-free group (r = − 0.64, p < 0.05).

Conclusion

Although both hydrogen peroxide-containing and peroxide-free cleaning agents effectively reduce discoloration, variations in their pH and chemical composition influenced their efficacy. The differences in surface alterations among the cleaning agents highlight the need for a comprehensive assessment before recommending specific products to patients for aligner maintenance.

Clinical relevance

Clinicians should consider the chemical composition and pH of cleaning agents when advising patients on aligner maintenance to avoid unwanted surface or color alterations.