Ortiz-Ruiz Antonio José, Muñoz-Gómez Iban Jesús, Pérez-Pardo Ana, Germán-Cecilia Concepción, Martínez-Beneyto Yolanda, Vicente Ascensión
Department of Integral Pediatric Dentistry, Faculty of Medicine and Dentistry, Hospital Morales Meseguer, University of Murcia, 2ª planta. C/ Marqués de los Vélez s/n., 30008, Murcia, Spain.
Department of Preventive Dentistry, University Dental Clinic, Faculty of Medicine and Dentistry, University of Murcia, Murcia, Spain.
Odontology. 2018 Oct;106(4):460-468. doi: 10.1007/s10266-018-0363-4. Epub 2018 Apr 27.
The aim was to evaluate the effect of fluoride varnish on the shear bond strength (SBS) on polished and non-polished intact and demineralized enamel. Bovine incisors (half demineralized) were used. Bifluorid 12™ was applied. Bonding was made with FuturabondM + and GrandioSO, 24 h and 7 days after varnishing. In some groups, varnish was removed by polishing before bonding. SBS was measured. Fracture type was determined by stereomicroscopy and scanning electron microscope (SEM) observations of the enamel surface were made. Between-group differences were determined by one-way ANOVA and the Tukey test. Associations between study factors and fracture modes were analysed using contingency tables and Pearson's chi-squared test. For intact enamel, SBS on varnished enamel at 24 h was significantly less than in the other groups. SBS recovered 7 days after varnishing. Varnish elimination after 24 h significantly increased the SBS. However, removal at 7 days did not modify SBS. SBS on demineralized enamel groups was significantly less than in intact enamel, except for demineralized enamel varnished and removed at 7 days. Demineralized enamel was associated with cohesive enamel fractures and intact enamel with cohesive fractures of the composite and adhesive fractures. SEM of varnish surfaces showed a homogenous layer scattered with amorphous precipitate. In conclusion, on intact enamel fluoride varnish had a negative effect on SBS at 24 h, which disappeared after 7 days. On demineralized enamel, varnish did not reduce SBS at either time. Polishing the varnished enamel surface showed a similar SBS to intact enamel after 7 days.
目的是评估含氟涂料对完整和脱矿釉质在抛光和未抛光情况下的剪切粘结强度（SBS）的影响。使用牛切牙（半脱矿）。应用了Bifluorid 12™。在涂覆含氟涂料24小时和7天后，用FuturabondM + 和GrandioSO进行粘结。在一些组中，在粘结前通过抛光去除含氟涂料。测量SBS。通过体视显微镜确定断裂类型，并对釉质表面进行扫描电子显微镜（SEM）观察。组间差异通过单因素方差分析和Tukey检验确定。使用列联表和Pearson卡方检验分析研究因素与断裂模式之间的关联。对于完整釉质，涂覆含氟涂料24小时后的SBS显著低于其他组。涂覆含氟涂料7天后SBS恢复。24小时后去除含氟涂料显著提高了SBS。然而，7天后去除并没有改变SBS。除了7天涂覆并去除含氟涂料的脱矿釉质组外，脱矿釉质组的SBS显著低于完整釉质组。脱矿釉质与釉质内聚性骨折相关，完整釉质与复合材料的内聚性骨折和粘结性骨折相关。含氟涂料表面的SEM显示有一层均匀的层，散布着无定形沉淀物。总之，对于完整釉质，含氟涂料在24小时时对SBS有负面影响，7天后消失。对于脱矿釉质，含氟涂料在两个时间点都没有降低SBS。对涂覆含氟涂料的釉质表面进行抛光后，7天后的SBS与完整釉质相似。
