ArticleDental press journal of orthodontics2026
Effects of carbonated drinks, alcoholic drinks and mouthwashes with varying pH on mechanical properties and colour stability of various thermoplastic retainers, aligners and occlusal splints: an in-vitro study.
Article in Dental press journal of orthodontics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
introductionThermoplastic materials used for retainers, aligners, and occlusal splints may degrade when exposed to common beverages and mouthwashes, affecting mechanical properties and aesthetics.
objectiveTo evaluate the effects of carbonated drinks, alcoholic beverages (brandy), and mouthwashes on the mechanical properties and colour stability of various orthodontic thermoplastics. MATERIAL AND
methodsA total of 144 samples from six thermoplastic materials (Erkodur, Duran, Erkodur-Al, CA Pro+, Erkoflex, Bioplast) were immersed daily for 10 minutes over 14 days in artificial saliva, brandy, carbonated drink, or chlorhexidine mouthwash. Mechanical properties (yield strength, stiffness, elastic modulus) were measured via universal testing machine; colour changes (ΔE) were assessed with a colorimeter. One-way ANOVA was used for statistical analysis (p < 0.05).
resultsRetainers immersed in saliva exhibited highest yield strength (Erkodur: 61.95 ± 4.21; Duran: 59.25 ± 3.12) and stiffness (Erkodur: 2.12 ± 0.19; Duran: 2.12 ± 0.23), with lowest values in carbonated drinks (Erkodur: 48.88 ± 3.32 ; Duran: 48.45 ± 5.77). Aligners and occlusal splints followed similar trends; Bioplast splints performed best mechanically (saliva: 63.05 ± 4.36 ; stiffness: 1.98 ± 0.13). Colour changes were greatest in alcoholic beverages, notably Duran (ΔE: 0.978 ± 0.21, p = 0.010) and Erkoflex (ΔE: 1.21 ± 0.06, p = 0.003); aligners and Bioplast showed minimal ΔE differences.
conclusionAcidic and alcoholic beverages significantly reduce mechanical strength and compromise aesthetics of thermoplastic orthodontic appliances. Bioplast exhibited superior mechanical performance among splints, while aligners demonstrated minimal discoloration. Patient education on limiting exposure to such beverages is crucial to maintain appliance durability and optimal treatment outcomes.
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