Effect of phosphoric acid concentration used for etching on the microtensile bond strength to fluorotic teeth

Gu, Mengqin; Lv, Linhu; He, Xiaoping; Li, Wangyang; Guo, Ling

doi:10.1097/md.0000000000012093

Cited by 13 publications

(24 citation statements)

References 14 publications

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“…[13,15,16] In addition, some scholars have shown that the bond strength of fluorosis tooth was lower than that of healthy tooth, the bond strength increased with the increasing concentration of phosphoric acid, but an excessively high acid concentration can conversely lead to an apparent decline in bond strength. [17] Therefore, in the case of enamel bonding of mild dental fluorosis, the bonding strength of the all acid etching adhesive was higher than that of the selfetching adhesive. The all acid etching bond strength of mild dental fluorosis was higher than the self-etched bond strength.…”

Section: Discussionmentioning

confidence: 97%

“…Dental fluorosis (DF) is caused by ingestion of excess fluoride mainly through drinking water. [4,6] At present, regarding the theory of dental enamel bonding, some scholars believed that mechanical chimera, physical adsorption and chemical bonding were the main ways of dental enamel bonding. [7] The retention force between the adhesive and the enamel mainly depended on mechanical fitting, so the surface morphology of the enamel would have a certain effect on the bonding strength.…”

Section: Discussionmentioning

confidence: 99%

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Micromorphology analysis and compare bond strength of two adhesives to different degrees of dental fluorosis

Liu¹,

Yang²,

Gegen³

2020

Preprint

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Objectives: To evaluate the effects of two adhesives on the bond strength of different degrees of dental fluorosis (DF). Methods: Teeth which were indicated for extractions for orthodontic or periodontal problems were selected. 180 extracted teeth were selected with varying degrees of DF based on modified Dean's fluorosis index, including 60 teeth with mild fluorosis, 60 teeth with moderate fluorosis, and 60 teeth with severe fluorosis. The teeth in each group were randomly divided into 2 subgroups (n=30) that were subjected to the all-etching bonding system (Prime & Bond NT) and self-etching bonding system (SE-Bond). Each group of adhesives was used to bond Z350 universal resin (3M) to the etched dental enamel. Tensile and shear testing were used to determine the bond strength. After the tensile testing, the fractured specimens were examined under scanning electron microscopy (SEM) and laser scanning confocal microscope. (LSCM). Results: The Prime & Bond NT had statistically significant on tensile and shear strength for mild fluorosis enamel (P<0.05), but it had no significant difference for moderate and severe dental fluorosis (P>0.05). Self-etching bonding system (SE-Bond) had no statistical significance on the tensile and shear strength for mild, moderate and severe dental fluorosis (P>0.05). SEM and LSCM showed that the mild fluorosis enamel crystals were relatively dense and a small amount of resin remained. The moderate fluorosis enamel crystals were loosely arranged and the gaps were widened. The severe fluorosis enamel crystals were irregularly arranged. The disorder was aggravated, and the dentinal orifice exposed by partial enamel exfoliation can be seen. Conclusions: The bonding strength of mild fluorosis enamel to Prime & Bond NT was better than that of SE-Bond . And there is no difference in the bonding strength of SE-Bond to different degrees of DF.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Micromorphology analysis and compare bond strength of two adhesives to different degrees of dental fluorosis

Liu¹,

Yang²,

Gegen³

2020

Preprint

View full text Add to dashboard Cite

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“…Although the mechanism is not clear, we speculate that the absence of collagen in enamel [35] makes this substrate unable to take advantage of the ability of IP6 to crosslink with collagen, which is one of the key factors in improving bonding to dentin. Though an ideal etch pattern is not essential to produce high bond strength to enamel [36,37], excessive etching whether by increasing the concentration or the application of time of the etchant would result in compromised bonding to enamel as a result of decreased hardness of this substrate [38,39]. IP6 is a stronger acid compared to phosphoric acid and has six phosphate groups with two dissociable OH groups in each phosphate [39].…”

Section: Discussionmentioning

confidence: 99%

Resin-Based Cement Applied to Enamel and Dentin Pre-Treated with Phytic Acid: An In Vitro Study

Nassar

Islam

et al. 2021

Applied Sciences

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Phytic acid (IP6) has the ability to etch tooth structure due to its acidity and chelating properties. This study aimed to evaluate the micro-tensile bond strength (μTBS) of resin-based cement to enamel and dentin using manufacturer-provided etchants, phosphoric acid (PA) for enamel and a mixture of 10% citric acid and 3% ferric chloride (CAF) for dentin and compare them to IP6. Enamel surfaces were etched for 30 s with either PA or IP6 (1%, 5% or 10%). Dentin surfaces were etched for 15 s with either CAF or 1% IP6. Pre-polymerized composite blocks were bonded to enamel and dentin surfaces. After 24 h, the specimens were sectioned into beams and subjected to μTBS testing. De-bonded specimens and smear layer removal were analyzed with a scanning electron microscope. Etching enamel with 1% and 5% IP6 resulted in μTBS values that are comparable to the control (PA) (p > 0.05), while 10% IP6 negatively affected the μTBS (p < 0.05). The μTBS to dentin etched with 1% IP6 was higher compared to the control (CAF) (p = 0.001). IP6 effectively removed enamel and dentin smear layer, and at specific concentrations, it may be a suitable alternative conditioner agent for bonding resin-based cement to enamel and dentin.

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“…At high levels, however, uoride affects the development of teeth and bone. Speci cally, DF is caused by the ingestion of excess uoride mainly through the drinking of water [17,18]. Additionally, the use of uoride is related to the exacerbation of DF.…”

Section: Discussionmentioning

confidence: 99%

Micromorphological analysis and bond strength comparison of two adhesives for different degrees of dental fluorosis

Liu¹,

Zhu²,

Gegen³

2020

Preprint

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The objective of this study was to analyze morphologically the all-etching bonding system and self-etching bonding system for enamel with different degrees of fluorosis and evaluate the bond strength of each system. Teeth that were indicated for extraction owing to orthodontic or periodontal problems were selected. According to Dean’s index and the Thylstrup-Fejerskov index, 180 extracted teeth were divided into three groups of mild, moderate, and severe dental fluorosis (DF), with 60 teeth in each group. The teeth in each group were randomly divided into two subgroups (n = 30), which were then subjected to the all-etching bonding system (Prime & Bond NT) and self-etching bonding system (SE-Bond). Each group of adhesives was used to bond Z350 universal resin (3M) to the etched dental enamel. Tensile and shear tests were conducted to determine the bond strength. Subsequently, the fractured specimens were investigated using scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). The Prime & Bond NT was statistically significant for the tensile and shear strength of enamel with mild fluorosis (P < 0.05) but did not exhibit a significant difference for moderate and severe DF (P > 0.05). The SE-Bond was not statistically significant for the tensile and shear strength of mild, moderate, or severe DF (P > 0.05). The SEM and CLSM results reveal that the mild fluorosis enamel crystals were relatively dense, and a small amount of resin remained. The moderate fluorosis enamel crystals were loosely arranged, and the gaps were widened. The severe fluorosis enamel crystals were irregularly arranged. The disorder was aggravated, and the dentinal orifice was exposed by partial enamel exfoliation. The bonding strength of mild fluorosis enamel with the Prime & Bond NT was better than that with the SE-Bond, and cohesive failure was the most common mode of failure. Because there was no difference in the bonding strength of the SE-Bond for different degrees of DF, we recommend the use of the all-etching adhesive system in the clinical treatment of teeth with mild fluorosis.

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Effect of phosphoric acid concentration used for etching on the microtensile bond strength to fluorotic teeth

Cited by 13 publications

References 14 publications

Micromorphology analysis and compare bond strength of two adhesives to different degrees of dental fluorosis

Micromorphology analysis and compare bond strength of two adhesives to different degrees of dental fluorosis

Resin-Based Cement Applied to Enamel and Dentin Pre-Treated with Phytic Acid: An In Vitro Study

Micromorphological analysis and bond strength comparison of two adhesives for different degrees of dental fluorosis

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