Power bleaching enhances resin infiltration masking effect of dental fluorosis. A randomized clinical trial

Kara

et al. 2020

BDS

Objective: Vital bleaching is popular treatment option for discolored teeth. But at post-treatment stage, loss of adhesion is highly reported. Literature focused on antioxidant application for the answer of this issue. The aim of this study is comparing effects of six different antioxidants on color stability of bleached teeth. Material and Methods: This study includes total of 84 extracted intact non-carious lower incisors. 35% hydrogen peroxide was applied on the labial surfaces of specimens in accordance with manufacturer's instructions. The bleached teeth were divided into 7 groups. No antioxidants were applied to the control group. For the experimental groups, the following antioxidants were applied for 10 minutes each: 5% proanthocyanidin, 5% sodium ascorbate, 5% lycopene, %5 green tea, %5 white tea and %5 ?-tocopherol. CIE L*, a* and b* values of the teeth were measured by a spectrophotometer. The data were analyzed using IBM SPSS version 23. Results: The differences between the groups were determined with one-way ANOVA. The one-way ANOVA test revealed a statistically significant difference between the groups (p<0.005). Highest color change was observed in lycopene group and the lowest was belongs to green tea group. Conclusions: Proanthocyanidin, white tea and green tea could be good post-bleaching antioxidant alternatives based on their herbal nature.

Section: Discussionmentioning

confidence: 99%

Evaluation the Effect of Different Antioxidants Applied After Bleaching on Teeth Color Stability

Kara

et al. 2020

BDS

“…Yüksek konsatrasyondaki florür, Bcl-2 gibi antiapoptoz proteinlerinin baskılanmasına neden olur. Bu durum ameloblastların programlanmış hücre apoptozunu tetikler, MMP-20 gibi proteaz enzimlerinin sentez ve sekresyonunu engeller (Schoppmeier et al, 2018). Mine matrix proteinlerinin başarısız degradasyonu nedeniyle apatit kristallerinin büyümesi ve mineral difüzyonunun önlenmesi söz konusudur ve sağlam mine yüzeyinin altında oluşan bu hipomineralize alanda içerisinde su ve hava olan mikroporoziteler bulunmaktadır.…”

Section: çEvresel Faktörlerin Neden Olduğu Gelişimsel Bozukluklarunclassified

“…Hafif floroziste, kesici kenara paralel uzanan, ince bant ya da benek şeklinde beyaz-opak çizgilenmeler söz konusudur. Orta şiddetli floroziste sarı-kahverengi lekelenmeler, daha şiddetli florozis olgularında ise tebeşirimsi-opak lezyonlar, diyet alışkanlıklarına göre koyu kahverengi renkleşmeler, poröz yüzeyler ve sürme sonrası oluşan çukurcuklu alanlar görülmektedir (Schoppmeier et al, 2018). Florozis opasiteleri dişler sürdüğünde mevcuttur ancak renkleşmelerin sürme sonrası alınan diyet pigmentlerine bağlı oluştuğu belirtilmektedir .…”

Section: çEvresel Faktörlerin Neden Olduğu Gelişimsel Bozukluklarunclassified

Developmental Defects of Enamel Tissue from Etiology to Minimally Invasive Treatment Procedures

Berkman¹,

Tuncer²,

Karabay³

et al. 2020

JSTR

The development process of tissue and organs in the living body is managed by genetic components and is affected by systemic diseases or environmental factors such as trauma, chemicals and radiation. Depending on the development phase that these factors occur, conditions such as deviations from normal growth and development, and the disruptions of tissue quantity and quality may occur. Disruption of the normal functioning of the amelogenesis steps for various reasons causes defections of enamel matrix formation, resorption, and subsequent calcification process. Clinically, this situation appears as defects characterized by features ranging from diffuse opacities to the complete absence of tooth enamel. Developmental enamel defects, the prevalence of which varies between 10% and 80%, cause problems that negatively affect individuals' quality of life, such as aesthetic problems, hypersensitivity, rapidly progressing caries, and tooth tissue loss. The aim of this study was to investigate the developmental enamel defects, their relationship with the development stages of the enamel, the etiological factors, in the light of current information. Clinical management of these defects and rehabilitation with minimally invasive approaches were evaluated with exemplary cases.

“…Various treatments and management strategies, such as bleaching, microabrasion, composite restorations, veneering, crowning, or a combination of two approaches, have been proposed to alleviate the effects of DF [5,[7][8][9]. However, owing to the physical and morphological changes induced by DF, bonding to this substrate is still clinically challenging because uorapatite is more resistant to acid dissolution compared with hydroxyapatite [10].…”

Section: Introductionmentioning

confidence: 99%

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

Liu¹,

Zhu²,

Gegen³

2020

Preprint

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.