Abstract:The objective of this
in vitro
study was to determine the effects of dental fluorosis on the tensile bond strength of metal brackets bonded to human teeth and to evaluate the changes in the tooth enamel surface after debonding. The study sample consisted of 68 recently extracted human upper premolars, which were divided into 2 groups: the fluorosis group (34 fluorosed teeth) and the control group (34 healthy teeth). Identical premolar metal brackets were bonded on the buccal surfaces of … Show more
“…To date, bleaching agents, such as hydrogen peroxide with concentration from 30% to 40% or carbamide peroxide with level from 35% to 37%, have been applied in clinics successfully, getting satisfying aesthetic results [3,4,6,[8][9][10]15,35]. However, most scholars suggested tooth bleaching can decrease the immediate BS-RBE [4][5][6][7][8][9]15,36]. It is due to bleaching agents damage the surface morphology of enamel.…”
Section: Discussionmentioning
confidence: 99%
“…According to previous studies, the evaluation methods of adhesive capacity include mainly Micro-shear bond strength (MSBS) test and micro-tensile bond strength (MTBS) test [36,43,44,46,47]. MSBS test has the advantages of simple specimen preparation and universal fixture.…”
Section: Evaluation Of Materials Bond Propertiesmentioning
Departmental sources Background: Tooth bleaching causes a significant decrease in the bonding strength between the resin and human enamel. Nevertheless, the effects of different antioxidant types on the immediate bonding strength of resin and bleached enamel were significantly different. Therefore, the objective of this study was to compare the effects of 2 antioxidants for enhancing the bond strength of the resin to bleached enamel. Material/Methods: There were 48 enamel blocks performed from 48 recently extracted maxillary central incisors. There were 8 groups: NC (negative control, no bleached specimens restored without antioxidants); NA (no antioxidant, bleached specimens bonded immediately without any antioxidants); SA30, SA60, and SA120 (bleached specimens accepted the management of 10% sodium ascorbate (SA) for 30 minutes, 60 minutes, and 120 minutes, respectively, before restored); PC30, PC60, and PC120 (bleached specimens received treatment of 5% proanthocyanidins (PC) for 30 minutes, 60 minutes, and 120 minutes, respectively, before restored). We measured the micro-tensile bond strength of specimens and used 2-way ANOVA to analyze the data.
“…To date, bleaching agents, such as hydrogen peroxide with concentration from 30% to 40% or carbamide peroxide with level from 35% to 37%, have been applied in clinics successfully, getting satisfying aesthetic results [3,4,6,[8][9][10]15,35]. However, most scholars suggested tooth bleaching can decrease the immediate BS-RBE [4][5][6][7][8][9]15,36]. It is due to bleaching agents damage the surface morphology of enamel.…”
Section: Discussionmentioning
confidence: 99%
“…According to previous studies, the evaluation methods of adhesive capacity include mainly Micro-shear bond strength (MSBS) test and micro-tensile bond strength (MTBS) test [36,43,44,46,47]. MSBS test has the advantages of simple specimen preparation and universal fixture.…”
Section: Evaluation Of Materials Bond Propertiesmentioning
Departmental sources Background: Tooth bleaching causes a significant decrease in the bonding strength between the resin and human enamel. Nevertheless, the effects of different antioxidant types on the immediate bonding strength of resin and bleached enamel were significantly different. Therefore, the objective of this study was to compare the effects of 2 antioxidants for enhancing the bond strength of the resin to bleached enamel. Material/Methods: There were 48 enamel blocks performed from 48 recently extracted maxillary central incisors. There were 8 groups: NC (negative control, no bleached specimens restored without antioxidants); NA (no antioxidant, bleached specimens bonded immediately without any antioxidants); SA30, SA60, and SA120 (bleached specimens accepted the management of 10% sodium ascorbate (SA) for 30 minutes, 60 minutes, and 120 minutes, respectively, before restored); PC30, PC60, and PC120 (bleached specimens received treatment of 5% proanthocyanidins (PC) for 30 minutes, 60 minutes, and 120 minutes, respectively, before restored). We measured the micro-tensile bond strength of specimens and used 2-way ANOVA to analyze the data.
“…The loops were bent from the orthodontic archwire and fixed to the brackets with ligatures (Fig. 1 ) 20 . Then they were adjusted to the universal mechanical testing machine (H24KT, Tinius Olsen, England).…”
Section: Methodsmentioning
confidence: 99%
“…The system consisted of a force sensor (SS50, Wagner Instruments, USA, 250 N × 0.1 N) and a controller with a display (BGI, Wagner Instruments, USA). TBS was calculated using the force’s value and the base of the bracket area value (1 MPa = 1 N/mm 2 ) 20 . Figure 1 Tooth fixed in universal testing machine.…”
Section: Methodsmentioning
confidence: 99%
“…The tensile bond strength of the brackets depends on many factors, such as the structure of the tooth, the etching time and the acid used, the type of bracket system, the type of bracket, or even previously done procedures on the teeth, such as teeth whitening with 35% hydrogen peroxide 19 – 22 . There is a significant influence on the structure of tooth enamel, as studies have shown that demineralized or fluorosis-damaged enamel surface significantly reduces the adhesion of the brackets 20 , 23 . The research also indicates that fluoride agents reduce adhesive adherence 24 , but the data on the effect of remineralizing agents on tensile bond strength is controversial.…”
This study aimed to evaluate the influence of the use of remineralizing agents on the tensile bond strength. The study sample consisted of 80 recently extracted molars, which were randomly divided into four experimental groups (n = 20): groups FG1 and FG30, in which fluoride varnish was used, and groups RG1 and RG30, in which Recaldent tooth mousse was used. The mesiobuccal surfaces served as experimental, and distobuccal as control (n = 80). Brackets were bonded to both surfaces and were submitted to a tension test at different time intervals (T1 and T30). Tensile bond strength (TBS) and the amount of adhesive remnant (ARI) were assessed. A statistically significantly lower mean of TBS compared to the control group was found only in the FG1 group (p < 0.001), and no significant difference was found between the other groups. The FG1 group showed significantly higher ARI scores (p < 0.001) compared to the control group. No significant difference was found between the other groups. In conclusion, bonding brackets one day after applying fluoride varnish significantly reduced the TBS, but after 30 days it was set back to an optimal value. The use of Recaldent before orthodontic treatment had no adverse effect.
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