Huilcapi Mariana, Armas-Vega Ana, Cardenas Andres Felipe Millan, Araujo Lucila Cristina Rodrigues, Ocampo Jessica Bedoya, Bandeca Matheus Coelho, Siqueira Fabiana Suelen Figuerêdo de, Loguercio Alessandro
Escuela Odontologia, Facultad de Ciencias de la Salud "Eugenio Espejo", Universidad UTE (Quito, Ecuador).
Universidade Ceuma, Departamento de Pós-graduação em Odontologia (São Luis/MA, Brazil).
Dental Press J Orthod. 2020 Jul-Aug;25(4):59-67. doi: 10.1590/2177-6709.25.4.059-067.oar.
To compare the effectiveness of the pretreatment with sandblasting and deproteinization with NaOCl on bond strength (SBS), in situ conversion degree (CD) of brackets in fluorotic enamel, and enamel etching pattern.
A total of 90 non-carious maxillary premolars were used. The teeth were then assigned to six experimental groups according to: enamel surface (sound and fluorotic enamel); surface treatment (Regular etch with 37% phosphoric acid [RE]; 5.2% sodium hypochlorite + phosphoric acid [NaOCl + RE]; sandblasting + phosphoric acid [sandblasting + RE]). After storage in distilled water (37°C/24h), the specimens were tested at 1 mm/min until failure (SBS). Enamel-resin cement interfaces were evaluated for CD using micro-Raman spectroscopy. The enamel-etching pattern was evaluated under a scanning electron microscope. Data from SBS and in situ CD values were analyzed using ANOVA two-away and Tukey test (α=0.05). The enamel etching pattern was evaluated only qualitatively.
For sound enamel, RE showed the highest SBS values, when compared to NaOCl + RE and Sandblasting + RE groups (p< 0.01). Regarding CD, only NaOCl + RE significantly compromised the mean DC, in comparison with other groups (p= 0.002). For fluorotic enamel, the Sandblasting + RE group significantly increased the mean SBS values, in comparison with RE group (p= 0.01) and no significant change was observed for CD (p> 0.52).
The application of NaOCl or sandblasting associated to phosphoric acid improved the SBS of the brackets in fluorotic enamel without compromising the CD of the resin cement, with improving of enamel interprismatic conditioning.
比较喷砂预处理和用次氯酸钠进行去蛋白处理对粘结强度（SBS）、氟斑牙釉质中托槽的原位转化率（CD）以及釉质酸蚀模式的影响。
共使用90颗无龋的上颌前磨牙。然后根据以下因素将牙齿分为六个实验组：釉质表面（正常釉质和氟斑牙釉质）；表面处理（用37%磷酸常规酸蚀[RE]；5.2%次氯酸钠+磷酸[NaOCl + RE]；喷砂+磷酸[喷砂+ RE]）。在蒸馏水中储存（37°C/24小时）后，以1毫米/分钟的速度对标本进行测试直至破坏（SBS）。使用显微拉曼光谱法评估釉质-树脂水门汀界面的CD。在扫描电子显微镜下评估釉质酸蚀模式。使用双向方差分析和Tukey检验（α=0.05）分析SBS和原位CD值的数据。仅对釉质酸蚀模式进行定性评估。
对于正常釉质，与NaOCl + RE组和喷砂+ RE组相比，RE组的SBS值最高（p<0.01）。关于CD，与其他组相比，只有NaOCl + RE组显著降低了平均DC（p = 0.002）。对于氟斑牙釉质，与RE组相比，喷砂+ RE组显著提高了平均SBS值（p = 0.01），并且未观察到CD有显著变化（p>0.52）。
次氯酸钠或喷砂与磷酸联合应用可提高氟斑牙釉质中托槽的SBS，而不影响树脂水门汀的CD，并改善了釉柱间质的处理效果。
