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<p>This study aimed to evaluate the shear bond strength of a resin composite rod to moderate human fluorotic enamel, using different surface pretreatments. 90 fluorotic teeth were randomly assigned to three groups. A crown-root cut was made, followed by a second disto-mesial cut to obtain adequate fragments from the vestibular/palatal-lingual side of each tooth, allowing for adequate adhesion of a surface area of 2.38 ± 0.03 mm2. Group I, surface was conditioned with 34% phosphoric acid for 20&#xa0;s; group II, surface was pretreated using Chemical microabrasion + 34% phosphoric acid for 20&#xa0;s; group III, surface was pretreated with pneumatic microabrasion and aluminum oxide + 34% phosphoric acid for 20&#xa0;s. The Universal Adhesive 3&#xa0;M<sup>™</sup> system and base-resin rods (Filtek<sup>™</sup> Z350 XT) were applied and light-cured. The shear forces were performed with a universal testing machine (Ametek<sup>™</sup>). The pneumatic pretreatment with aluminum oxide + 34% phosphoric acid etching had the highest shear bond strength values. One-way ANOVA showed statistically significant differences between the groups (<i>p</i> = 0.00016), and Dunnett's post hoc test showed differences between each group: group I vs. group II (<i>p</i> = 0.00032); and group I vs. group III (<i>p</i> = 0.00089). Groups II and III had statistically better shear bond strengths compared to group I. Our study demonstrated that a combined approach of pneumatic microabrasion and 34% phosphoric acid etching enhances shear bond strength to fluorotic human enamel, particularly in moderate cases.</p>

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Pretreatment of fluorotic human enamel surface by chemical and pneumatic microabrasion exerts effects on shear bond strength: an in vitro study

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Luis Javier Solís-Martínez,
  • Víctor Hiram Barajas-Pérez,
  • Mayra Olvera,
  • Omar Alejandro Tremillo-Maldonado,
  • Nohé Vargas-Chávez,
  • Edgar García-Torres

摘要

This study aimed to evaluate the shear bond strength of a resin composite rod to moderate human fluorotic enamel, using different surface pretreatments. 90 fluorotic teeth were randomly assigned to three groups. A crown-root cut was made, followed by a second disto-mesial cut to obtain adequate fragments from the vestibular/palatal-lingual side of each tooth, allowing for adequate adhesion of a surface area of 2.38 ± 0.03 mm2. Group I, surface was conditioned with 34% phosphoric acid for 20 s; group II, surface was pretreated using Chemical microabrasion + 34% phosphoric acid for 20 s; group III, surface was pretreated with pneumatic microabrasion and aluminum oxide + 34% phosphoric acid for 20 s. The Universal Adhesive 3 M™ system and base-resin rods (Filtek™ Z350 XT) were applied and light-cured. The shear forces were performed with a universal testing machine (Ametek™). The pneumatic pretreatment with aluminum oxide + 34% phosphoric acid etching had the highest shear bond strength values. One-way ANOVA showed statistically significant differences between the groups (p = 0.00016), and Dunnett's post hoc test showed differences between each group: group I vs. group II (p = 0.00032); and group I vs. group III (p = 0.00089). Groups II and III had statistically better shear bond strengths compared to group I. Our study demonstrated that a combined approach of pneumatic microabrasion and 34% phosphoric acid etching enhances shear bond strength to fluorotic human enamel, particularly in moderate cases.