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:: Volume 33, Number 1 (Winter 2015) ::
J Dent Sch GYEAR__, 33(1): 66-73 Back to browse issues page
Destructive effects of citric acid, lactic acid and acetic acid on primary enamel microhardness
A Nozari, A Rahmati, Z Shamsaei, A Pour Hashemi, MK Layeghnejad, S Zamaheni *
Postgraduate Student, , sara_812004@yahoo.com
Abstract:   (1188 Views)

  Objective: This study aimed to assess the destructive effects of citric acid, lactic acid and acetic acid produced from the fermentation of foods on primary teeth enamel.

  Methods: This in vitro, experimental study was conducted on 24 sound primary teeth. The teeth were polished with a fine abrasive paper under running water. Tooth pieces measuring 3 × 4 × 3mm were cut out of the teeth and stored in 100% humidity until the experiment. The specimens were divided into 3 groups (n=8) and immersed in acetic acid, citric acid and lactic acid, respectively. The enamel microhardness of specimens was measured by Vickers microhardness tester at baseline and 5 and 30min after immersion in the freshly prepared acid solutions.

  Results: Repeated measures ANOVA showed that the effect of immersion time on microhardness was significant (p<0.001). Pairwise comparison among 0, 5 and 30 minutes time points using Bonferroni adjustment showed significant differences in microhardness at different time points (p<0.001). Evaluation of the effect of type of acid on microhardness revealed that the microhardness was not significantly different in the three groups of acids (p=0.915). Among the three understudy acids, only the reduction in microhardness from time 0 to 30 minutes was significantly different between lactic acid and acetic acid (p=0.042).

  Conclusion: Citric acid, lactic acid and acetic acid were all capable of demineralization and reduction of enamel microhardness. A significant difference existed in the demineralization potential of acids (the highest for lactic acid). However, this effect was more significant early after exposure.

Keywords: Acid, Enamel, Fermentation, Hardness, Primary teeth.
Full-Text [PDF 55 kb]   (741 Downloads)    
Type of Study: Original Article | Subject: Special
Received: 2015/03/10 | Accepted: 2015/03/10 | Published: 2015/03/10
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Nozari A, Rahmati A, Shamsaei Z, Pour Hashemi A, Layeghnejad M, Zamaheni S. Destructive effects of citric acid, lactic acid and acetic acid on primary enamel microhardness . J Dent Sch. 2015; 33 (1) :66-73
URL: http://jds.sbmu.ac.ir/article-1-1374-en.html
Volume 33, Number 1 (Winter 2015) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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