The effects of 45S5 bioactive glass and Er:YAG Laser on the microtensile bond strength of fluorosed teeth

Abstract

This vitro study aimed to evaluate the effects of 45S5 bioactive glass (BAG) and Er: YAG laser as desensitization treatments on the microtensile bond strength (MTBS) of fluorosed teeth. The 120 noncarious fluorosis were to obtain superficial dentin, being classified into four groups according to the Thylstrup and Fejerskov Index (TFI). Specimens from each group were randomly divided into five subgroups. After fluorosed teeth hypersensitivity models were established, the following pretreatments were applied on dentine surface: Subgroup 1: deionized water (Control); Subgroup 2: BAG; Subgroup 3: Er:YAG laser; Subgroup 4: BAG + Er:YAG laser, and Subgroup 5: Er:YAG laser + BAG. One sample was randomly selected from each subgroup for scanning electron microscope (SEM). The remaining samples were bonded with composite resin by Adper Single Bond 2 adhesive. Then water bath at 37 C for 24 hr. After 5,000 thermocycling, MTBS was tested and fracture mode was analyzed. The difference of MTBS between BAG group and Control group was found statistically significant (p < .05) in fluorosis. The Er:YAG laser + BAG group showed lowest MTBS values in fluorosis. In conclusion, the pretreatment of BAG might be beneficial to the adhesive of fluorosed teeth. Er:YAG laser desensitization alone or using BAG first and then Er:YAG laser desensitization might not affect the adhesive of fluorosed teeth, while Er:YAG laser desensitization followed by the pretreatment of BAG would be not conducive to the adhesive of fluorosed teeth.

Effects of dimethyl sulfoxide pretreatment on the bonding properties of fluorotic dentin of different severity: An in vitro study

“…As the DC was not influenced by the addition of 50% DMSO, that null hypothesis was not rejected. The bond strength of SE-F was consistently lower than that of ML-F, while the bond strength of MD-F was at an intermediate level, consistent with previous studies, 22,23 suggesting that dental fluorosis is a gradual change from quantitative to qualitative. 20,22,23 Dental fluorosis, Representative scanning electron microscope images (original magnification ×50 000).…”

“…The bond strength of SE-F was consistently lower than that of ML-F, while the bond strength of MD-F was at an intermediate level, consistent with previous studies, 22,23 suggesting that dental fluorosis is a gradual change from quantitative to qualitative. 20,22,23 Dental fluorosis, Representative scanning electron microscope images (original magnification ×50 000). A-C, Exposed collagen fibrils observed within peritubular and intertubular dentin after etch-and-rinse.…”

“…Lower bond strength and long-term bonding integrity have been shown when bonding to fluorotic dentin than to sound dentin. [20][21][22][23] Therefore, the development of additional formulations or strategies to improve the bonding efficiency of fluorotic dentin would be beneficial.…”

Effects of different surface preparations of fluorotic enamel on the bonding strength of attachment in Clear aligners

“…Er: YAG laser has been con rmed to improve the structure and function of dental uorosis, which may alleviate the poor bonding capability 24,25 . Moreover, Er: YAG laser was considered to be used in orthodontic brackets re-bonding, providing a better bonding approach 18,26 .…”