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Purpose <p>This study evaluated the effect of Er,Cr:YSGG laser treatment, with or without nano-hydroxyapatite (nHAP) toothpaste, on the mineral content of primary enamel specimens, with emphasis on their remineralization potential in pediatric dentistry.</p> Materials and methods <p>This in vitro study included 33 sound primary anterior teeth, from which enamel slabs were prepared and subjected to demineralization for 96 hours. Specimens were randomly assigned to three groups (<i>n</i> = 11): Group A (nHAP toothpaste), Group B (Er,Cr:YSGG laser, 2780 nm), and Group C (combined laser and nHAP toothpaste). Mineral phase composition was assessed using X-ray diffraction (XRD).</p> Results <p>Quantitative phase analysis revealed an increase in apatite crystal content in all groups following treatment. Group C showed the highest increase (7.4%) and exhibited a complete transformation into apatite structures. Groups A and B demonstrated comparable increases (5.1% and 4.8%, respectively), with no statistically significant difference between them.</p> Conclusions <p>Both Er,Cr:YSGG laser irradiation and nHAP toothpaste enhanced apatite formation in demineralized primary enamel; however, their combined application produced the most pronounced remineralization effect.</p>

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Effect of enamel surface treatment via Er, Cr: YSGG laser and nano-hydroxyapatite toothpaste on mineral content of primary teeth via x-ray diffractometer: an in-vitro study

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  • 出版模式：

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  • 发表日期：

    2026年4月11日

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  • Fatma Mohamed Elhussini,
  • Dina Hamdy,
  • Ahmed Hammad Abodouh,
  • Gehan Gaber Allam

摘要

Purpose

This study evaluated the effect of Er,Cr:YSGG laser treatment, with or without nano-hydroxyapatite (nHAP) toothpaste, on the mineral content of primary enamel specimens, with emphasis on their remineralization potential in pediatric dentistry.

Materials and methods

This in vitro study included 33 sound primary anterior teeth, from which enamel slabs were prepared and subjected to demineralization for 96 hours. Specimens were randomly assigned to three groups (n = 11): Group A (nHAP toothpaste), Group B (Er,Cr:YSGG laser, 2780 nm), and Group C (combined laser and nHAP toothpaste). Mineral phase composition was assessed using X-ray diffraction (XRD).

Results

Quantitative phase analysis revealed an increase in apatite crystal content in all groups following treatment. Group C showed the highest increase (7.4%) and exhibited a complete transformation into apatite structures. Groups A and B demonstrated comparable increases (5.1% and 4.8%, respectively), with no statistically significant difference between them.

Conclusions

Both Er,Cr:YSGG laser irradiation and nHAP toothpaste enhanced apatite formation in demineralized primary enamel; however, their combined application produced the most pronounced remineralization effect.