Wear performance of Ti-based alloy coatings on 316L SS fabricated with the sputtering method: Relevance to biomedical implants.

BACKGROUND: This investigation was conducted to encapsulate 316L SS with a Ti-based alloy coating. OBJECTIVE: The aim was to fabricate a coating using TiN, TiO2, and TiCoCr powders on 316L SS through the physical vapor deposition (PVD) sputtering process. METHODS: The powders were consecutively coated on 316L SS through the PVD sputtering process with coating durations of 30, 60, and 90 min. Further microhardness, surface roughness, microabrasion, and adhesion strength tests were also carried out. RESULTS: A 60% improvement in abrasion resistance was observed in TiCoCr-coated samples compared to the uncoated substrate. The X-ray diffraction results confirmed the optimal formation of Ti alloy coatings with corresponding orientation over the SS substrates. Moreover, TiCoCr with a 90 min coating duration had much better surface characteristics than TiO2 and TiN. CONCLUSION: The 90 min coating duration should be optimal for coating in steel for bio-implants.

Comparison of aesthetic treatments for molar-incisor hypomineralisation: Systematic review and meta-analysis.

Introduction: Molar incisor hypomineralisation (MIH) is a developmental defect that predominantly targets the first permanent molars and incisors and consists of hypomineralisation of the enamel. A range of treatment options are available to improve aesthetics in this condition, including resin infiltration, bleaching techniques, restorations, microabrasion, and laser therapy. Objectives: This systematic review and meta-analysis aimed to analyse the effects of treatments on changes in enamel colour in teeth with MIH lesions and determine whether resin infiltration is the most aesthetic treatment. Material and Methods: A systematic literature search was conducted on PubMed, Web of Science, EBSCO, and Scopus databases until December 2022. The addressed PICO question was: "Is resin Infiltration the most effective treatment for restoring aesthetics in comparison to other treatments in patients with Molar incisor hypomineralisation?''. In addition, a meta-analysis was conducted with the selected studies to integrate the information using R.51 software (R Core Team (2013)). Results: In total, 678 articles were obtained from the initial search, of which 11 met the inclusion criteria. Seven studies concluded that resin infiltration was the most successful treatment method in the aesthetic rehabilitation of MIH lesions. Six of the eleven articles were included in the meta-analysis, which indicated that the treatments generated substantial colour changes. Conclusions: This systematic review and meta-analysis provided significant data suggesting that resin infiltration is the most effective treatment for achieving aesthetic improvements in MIH lesions, with the meta-analysis providing a significant result (p = 0.051) in favour of the hypothesis.

Effectiveness of resin infiltration (ICON) and microabrasion-remineralization technique with two remineralizing agents (Tooth Mousse and Toothmin) on permanent incisor hypoplasia - A randomized clinical trial.

Aims: The study aims to compare the effect of resin infiltration and microabrasion-remineralization (MAb-Re) with Tooth Mousse and Toothmin on permanent incisor hypoplasia. Materials and Methods: The study included children with permanent incisor hypoplasia above 9 years of age, 171 teeth divided randomly into four groups: Group A - ICON, Group B - MAb-Re using Tooth Mousse, Group C - MAb-Re using Toothmin, and Group D - control group. Process involved taking standardized photographs at T1 - before intervention, T2 - immediately after treatment, and T3 - 6-month follow-up. Color evaluation, area calculation, participant and expert opinion using a Likert scale, treatment time, and cost-effectiveness were all taken into consideration during the assessment. Statistical Analysis Used: Data were collected, entered into a computer, and analyzed; one-way ANOVA was used for intergroup assessment. Results: Overall color change was evident immediately after treatment in the ICON group compared to other groups (P < 0.05). However, no significant difference in color change was visible between the groups after 6 months. Reduction in hypoplastic area was seen in all the groups. The mean time was similar for all the groups. Toothmin was found to be the most cost-effective in comparison with the other two interventions. Conclusions: ICON proved to be more effective immediately after treatment for masking incisor hypoplasia. However, at 6-month follow-up interval, all the groups gave similar results.

Aesthetic management of discoloured incisors in children.

Children can often present with discolouration of their teeth, commonly affecting their permanent maxillary central incisors. These opacities can often cause children to suffer with psychosocial and confidence related issues. With long waiting lists in secondary care, many children may face increased waiting times to receive aesthetic dental treatment. It is important that the dental professional is aware of the different causes of discolouration, the possible treatment options and when to consider a referral to secondary care.

"Comparative Evaluation of Three Different Microabrasion Techniques in Esthetic Management of Fluorosis": An In Vivo Study.

Aim: "Comparative evaluation of three different microabrasion techniques in esthetic management of fluorosis"-an in vivo study. Materials and methods: A total of 48 permanent incisors in children between the age-groups of 8-12 years with Dean's fluorosis index modified criteria 1, 2, and 3 were included. The patients were randomly divided into three groups; each group included 16 samples. Group I-phosphoric acid and pumice microabrasion (37% phosphoric acid and pumice as abrasive), group II-opalustre microabrasion [6.6% hydrochloric (HCL) acid and silicon dicarbide (SiC2)], and group III-icon etch microabrasion (15% HCL acid gel as icon etch, pumice, and resin infiltrate). Preoperative sensitivity and pulp vitality of each tooth were evaluated. Standardized preoperative photographs were captured for the evaluation of color parameters L1, a1, and b1 by Adobe Photoshop 7 software and an assessment of color enhancement was carried out. Preoperative surface roughness was evaluated with two methods like, cellulose acetate replicating tape and confocal microscope, and Epoxy resin replica obtained from the preoperative impression of teeth using additional silicone and contact profilometer. Microabrasion was done accordingly. Postoperative values of all the parameters were evaluated. Results: Phosphoric acid and pumice showed the best color change, followed by icon etch resin infiltrate. Opalustre (6.6% HCL acid and SiC2) and was unsuccessful as it had less concentration and was more abrasive. Conclusion: Phosphoric acid and pumice showed the best color enhancement, followed by icon etch resin infiltrate and opalustre. Icon etch resin infiltrate showed minimal surface roughness followed by phosphoric acid and pumice and opaluster group. How to cite this article: Reddy VN, Nagar P, Lakhotia R, et al. "Comparative Evaluation of Three Different Microabrasion Techniques in Esthetic Management of Fluorosis": An In Vivo Study. Int J Clin Pediatr Dent 2023;16(4):572-581.

Surface roughness and microhardness of enamel white spot lesions treated with different treatment methods.

Objective: To analyse the surface roughness and microhardness of artificial enamel white spot lesions before and after WSL formation, after treatment (Opalsutre™ microabrasion, Sylc® bioactive glass, and ICON® resin infiltration), and after pH cycling with the help of the profilometer surface roughness tester and the digital Vickers microhardness tester. Materials and methods: Seventy-five extracted molars were used to acquire one hundred specimens. 50 specimens were randomly assigned to five groups (n = 10) for the surface roughness study: 1) Sound group, 2) WSL group, 3) micro abrasion (MA; Opalustre, Ultradent, South Jordan, UT, USA), 4) bioactive glass 45S5 Sylc powder (Sylc; Denfotex Research Ltd, Inverkeithing, UK), and 5) ICON resin infiltration (ICON; DMG, Hamburg, Germany). An additional 25 specimens were used to obtain 50 enamel slabs for the surface microhardness study, which were also assigned to the same groups. All groups underwent a final stage of pH cycling. Surface roughness and surface microhardness measurements were performed at different stages for all groups. Results: Regarding surface roughness, ICON significantly reduced the surface roughness compared to Opalustre and Sylc, with no significant difference between Opalustre and Sylc. In terms of surface microhardness, ICON showed the highest improvement, followed by Sylc and then Opalustre. Both surface roughness and microhardness were significantly affected by demineralization, partially improved after treatment, and then regressed significantly after pH cycling. Conclusion: ICON resin infiltrant can be considered as a superior treatment option for improving surface roughness and microhardness, while Opalustre demonstrated relatively the poorest performance compared to the other treatment options. It is noteworthy that the pH cycling procedure had an adverse impact irrespective of the treatment option used.

Conservative esthetic management of brown enamel fluorosis using combination therapy: A clinical report.

Dental fluorosis is caused by ingestion of excessive fluoride during tooth development resulting in hypomineralization of the enamel and can present as white or brown intrinsic lesions. This case report describes a combination of minimally invasive techniques: microabrasion, bleaching, and resin infiltration to address brown enamel fluorosis present on the maxillary anterior teeth of a young patient. Before resin infiltration, air microabrasion was targeted at subsurface lesions located on the maxillary central and lateral incisors, and chairside bleaching was done with 37% hydrogen peroxide (Opalescence). After which, hypoplastic lesions on the buccal surfaces were etched before being treated with two sessions of resin infiltration (ICON and DMG). Following treatment, satisfactory esthetic outcomes were achieved. Accurate diagnosis, depth of lesions, and understanding the effectiveness and limitations of each technique are essential to select the appropriate type of treatment to obtain the best esthetic outcome. In conclusion, the conservative management of varying severity of dental fluorosis may require the appropriate use of combination treatment modalities, such as microabrasion, bleaching and resin infiltration, when clinically indicated, to address the treatment needs and achieve a desired outcome.

Study on the Micro-Abrasion Wear Behavior of PVD Hard Coating under Different SiC Abrasive Particles/Distilled Water Ratios.

Microscale abrasion has been intensively used to study the wear behavior o several hard coatings, enabling the observation of different wear mechanisms. Recently, a study arguing whether the surface texture of the ball could influence the dynamics of abrasive particles throughout the contact was presented. In this work, the influence of the abrasive particles concentration able to change the texture of the ball was studied to understand its influence on the wear modes-rolling or grooving. Thus, tests were carried out using samples with a thin coating of TiN, deposited using the Physical Vapor Deposition (PVD) technique, and AISI 52100 steel balls etched over 60 s to induce a change in their texture and roughness were used. Three abrasive slurries were prepared with black silicon carbide (SiC) particles (average particle size of 4 µm) with different concentrations, 0.25, 0.35, and 0.45 g/cm3. The rotation speed used in the tests was 80 rpm and the normal loads applied in the study were 0.2 N and 0.5 N, and 1 N. After the wear tests, the coated samples and tracks on the surface of the balls were observed by SEM and 3D microscopy to understand the abrasive particle dynamics, evaluating the wear mode transition as well as the function of both applied load and slurry concentration. The tracks in the balls showed particles embedded on their surface. A lower concentration of abrasion was conducted to higher specific wear rate. Moreover, a predominant two-body wear mechanism was induced when the abrasive concentration was increased. There was an increase in the roughness of the scar and the surface of the balls with an increase in the abrasive particles' concentration.

Microabrasion in the management of enamel discolorations in paediatric dentistry: a systematic review.

Structural abnormalities of the anterior teeth could be aesthetically compromising in young patients. The dentist must provide solutions while preserving dental tissue. Microabrasion approach can be a solution. We conducted a systematic literature review to evaluate whether microbrasion treatment in paediatric dentistry can improve aesthetic in cases of pre- or post-eruptive discolorations on tooth enamel. 741 articles published up to September 2021 were selected from 3 databases using the key word "microabrasion". 11 prospective studies including 6 randomized were relevant to the inclusion criteria. Microabrasion appears to be an effective and reliable technique for the management of pre and post enamel discoloration in paediatric dentistry, especially in fluorosis. More high-powered, well-conducted randomized studies with complete evaluation criteria are needed for other types of spots. Standardization of criteria for assessing treatment success and of the protocol required should be explored.

Efficacy of microabrasion and resin infiltration techniques for masking of fluorotic white spot lesions: A randomized clinical study.

Aim: The aim of the study was to compare the esthetic treatment outcome and quantification of tooth color changes using microabrasion and resin infiltration techniques of fluorotic white spot lesions (WSLs). Subjects and Methods: Sixty-six teeth with fluorotic small opaque white areas involving 25%-50% (very mild/mild fluorosis) of the surface were randomly assigned into two groups for microabrasion and resin infiltration techniques. To quantify tooth color changes, depicted by Delta E (DE), photographic analysis was performed using Adobe Photoshop CS5 Extended version by measuring Commission Internationale de l'Eclairage L*a*b* values of each tooth at two points, i.e. one at WSL and the other one at sound adjacent enamel. Statistical Analysis Used: Data were analyzed with t-test using SPSS software version 23. Results: L*value (decrease in whiteness) of posttreatment WSL decreased in both groups but was higher in the resin infiltration group, which was statistically significant. There were no statistically significant changes observed in a* and b* values of WSL in both groups. DE value difference of pre and postoperative was higher in the resin infiltration group, which was statistically significant which indicated the stability of color obtained by the resin infiltration group. Conclusions: Resin infiltration technique is more efficient in the immediate elimination of fluorotic WSL than microabrasion.

Microleakage Assessment of Different Preparation Techniques and Pit and Fissure Sealants in Permanent Molars.

BACKGROUND: This study aimed to evaluate the predisposition of microleakage in permanent molar teeth following different preparation techniques for pits and fissure sealants. METHODS: In this cross-sectional analytical study, a dye penetration method was employed to evaluate microleakage in dental restorations. A total of 104 extracted molars were randomly assigned into two groups and further subdivided into two subgroups based on a class of sealant (filled/unfilled resin) containing 26 teeth each. Teeth in one group were prepared by a conventional method using pumice and acid etching with 37% phosphoric acid, and teeth in the other group were prepared with a 1/4-round carbide bur in a low-speed handpiece and then acid etched. In each group, 26 teeth were sealed with a filled sealant, and 26 teeth with an unfilled sealant. The chi-square test was used for the comparison of microleakage between the groups. RESULTS: Unfilled sealants prepared with bur preparation showed the lowest degree of microleakage. The greater number of teeth (17) showed no microleakage in the group of teeth prepared using the bur preparation technique. Furthermore, in dye penetration analysis, the subgroup of teeth that were filled with unfilled sealants showed a greater number of teeth (57.6%), with zero penetration, and the dye penetration scores were statistically significant among the groups with different preparation techniques (p=0.002). CONCLUSION: Teeth whose pits and fissures were prepared through 1/4 carbide bur and filled with unfilled pits and fissure sealants show less microleakage than those prepared with the conventional method and filled with filled sealants. Therefore, the choice of surface preparation technique for pit and fissure sealants can influence the effectiveness of the sealant in preventing microleakage.

Effect of microabrasion on the staining susceptibility of enamel: An in vitro study.

Background. Enamel microabrasion can eliminate enamel irregularities and discoloration. This study evaluated the staining susceptibility of enamel after microabrasion using different clinical protocols. Methods. A total of 210 extracted bovine incisors were used in this study. The teeth were randomly divided into five groups of 42 teeth each (n=42), including group 1: control (no treatment), group 2: microabrasion, group 3: microabrasion + fluoride polishing, group 4: macroabrasion (fine-grit diamond bur) + microabrasion, and group 5: macroabrasion (finegrit diamond bur) + microabrasion + fluoride polishing. The groups were then randomly divided into two subgroups for discoloration procedures: coffee and distilled water (n=21). A spectrophotometric evaluation was carried out at baseline and on the 1st, 7th, 14th, and 28th days of the staining period. Statistical analyses were performed using repeated-measures ANOVA and the post hoc Bonferroni test at a significance level of 0.05. Results. The greatest color change was observed in group 2 specimens, which were immersed in coffee solutions. The color change values for groups 3, 4, and 5 specimens, which were immersed in distilled water, were higher than those in group 1 specimens (P<0.05). The fluoride polishing + enamel microabrasion treatment groups (groups 3 and 5) exhibited greater resistance to color changes than the matched non-fluoride-polished groups (groups 2 and 4) (P<0.05). Conclusions. The teeth that underwent enamel microabrasion treatment and were polished with fluoride gel became more resistant to color changes. Our findings confirm that enamel microabrasion treatment is a conservative method for localized discoloration.

Improved Surface Layer Erosion of Pit and Fissure Caries Lesions in Preparation for Resin Infiltration.

The penetration of a low-viscosity resin (infiltrant) into caries lesions depends on the erosion of the relatively impermeable surface layer (SL) that covers the lesion body. The present study aimed to evaluate the effect of different abrasive pretreatments on erosion of the SL and on penetration of an infiltrant into occlusal caries lesions, simultaneously. Sixty extracted human molars showing International Caries Detection and Assessment System (ICDAS-2) lesions were randomly allocated to 5 groups. A small area of each lesion was covered with resin before etching. Twelve lesions each were etched with either 15% HCl-gel (H120) or 37% H3PO4-gel (P120) for 120 s. Furthermore, the standard 15% HCl-gel or either one of two experimental etchants (HCl-gel or H3PO4-gel, each including abrasives) were applied for either 120 s or 30 s using a brush (surface pressure 150 g) (H30B, P120BA, H30BA). After rinsing and drying, all lesions were infiltrated for 180 s (Icon; DMG). From each tooth sections were prepared and visualized using confocal microscopy. SL of unetched areas and the lesion depth were 33 (23/51) µm and 537 (274/876) µm, respectively, both not differing significantly between groups. H120, H30B, and H30BA showed significantly higher SL reduction compared with P120 or P120BA, but only for H30BA SL was eroded almost completely (p < 0.05; Mann-Whitney test). Compared to other groups, occlusal lesions were significantly more infiltrated in H30BA (p < 0.05; Mann-Whitney test). HCl-gel including abrasives that was rubbed onto the enamel surface with a brush seems to be most effective to erode SLs of caries lesion situated in fissures and enable an almost complete subsequent resin infiltration.

Manejo estético de la fluorosis dental: Microabrasión, infiltración de resina y clareamiento externo

La fluorosis dental es una afección que produce discromías antiestéticas del esmalte, mayormente en pacientes jóvenes, hasta hace poco tratadas mediante restauraciones o carillas que requerían eliminar gran cantidad de tejido duro. La Odontología Mínimamente Invasiva nos aporta la microabrasión, que elimina el esmalte poroso exterior, y la infiltración de resina, con la que logramos efectos de camuflaje estético en el esmalte. También conocemos los protocolos de clareamiento dental, eficaces para mejorar la apariencia de los dientes. Este reporte describe el manejo estético, con estas tres técnicas, de una paciente con fluorosis e imperfecciones cromáticas. Conclusiones: Este caso corrobora los resultados de todos los estudios previos, mostrando una combinación de técnicas conservadoras para llegar a resultados altamente estéticos, manteniendo la integridad de los tejidos dentarios.

Dental fluorosis is a condition that causes unaesthetic enamel dyschromia, especially for young patients, until recently treated with restorations or veneers that required the removal of a large amount of hard tissue. Minimally invasive dentistry provides us with microabrasion, which eliminates the outer porous enamel, and resin infiltration, with which we achieve aesthetic camouflage effects on the enamel. We also know the dental bleaching protocols, effective in improving the appearance of the teeth. This report describes the aesthetic management, with these three techniques, in a patient with fluorosis and chromatic imperfections. Conclusions: This case corroborates the results of all previous studies, showing that a combination of conservative approaches reaches highly aesthetic results, while maintaining the integrity of the dental tissues.

Effect of nonthermal atmospheric plasma, grape seed extract, and bromelain on immediate bonding of composite to bleached and microabraded surfaces.

Background: Tooth whitening procedures such as bleaching and microabrasion alters the enamel surface and thus reduce the composites' bond strength. Hence, various surface treatments were introduced to overcome this problem. Aim: To assess the effect of nonthermal atmospheric plasma (NTAP), grape seed extract (GSE) and bromelain on the shear bond strength (SBS) of the composite after bleaching and microabrasion. Materials and Methods: Eighty extracted maxillary anterior teeth were distributed into two groups. Group 1: bleaching and Group 2: Microabrasion and further subdivided into four subgroups (n = 10) based on the form of surface treatment employed. Group A: no surface treatment, Group B: bromelain, Group C: GSE, Group D: NTAP. Composite resin was bonded to the labial surface and placed in artificial saliva for 24 h. SBS testing was done for all the samples. Statistical Analysis: Analysis was performed using two-way analysis of variance and post hoc Tukey's test with P < 0.05 considered statistically significant. Results: Group 1D revealed the highest bond strength (35.4 Mpa) and Group 1A showed the least bond strength values (15.7 Mpa). Among the bleaching groups, significant difference was observed between all the subgroups except Group 1A and 1B (P = 0.972). In microabrasion group, significant difference was observed between Group 2A and 2D (P = 0.0001), Group 2B and 2D (P = 0.0010), and Group 2C and 2D (P = 0.0001). Conclusions: Following bleaching, NTAP application and GSE significantly improved the SBS of composite resin. Application of NTAP to microabraded surfaces increased the bond strength of composite resin.

Newer Technique of Extra-Coronal Bleaching with Sodium Perborate on Non-Pitted Fluorosis Stains in Permanent Anterior Teeth.

Variety of treatment approaches have been proposed for esthetic management of dental fluorosis. Microabrasion, bleaching using hydrogen peroxide, and etch bleach seal are commonly used methods. Bleaching using sodium perborate has been used for intracoronal bleaching. Till now, no study has used sodium perborate for extracoronal bleaching of discolored stained teeth. OBJECTIVES: To evaluate the esthetic improvement of non-pitted fluorosis stains using sodium perborate and compare with etch bleach seal, microabrasion and in-office bleaching with 30% H2O2 on visual assessment scale VAS (primary objective) and to assess any untoward effects including staining, sensitivity, gingival problems within the course of study (secondary objectives). STUDY DESIGN: A randomized control trial with 6 months follow up. Methodology- Twenty children aged 8 to 12 years with non-pitted fluorosis in upper anterior teeth were divided into 4 groups with 5 patients in each group. RESULTS AND DISCUSSION: All of the techniques showed improvement in esthetics with VAS. However, microabrasion and bleaching using sodium perborate had significantly better results than other 2 techniques. CONCLUSION: Sodium perborate showed excellent results in extracoronal bleaching of fluorosed teeth. However a randomized study with large sample size is required to draw a definitive conclusion regarding superiority of one technique over others.

Comparative Evaluation of Esthetic Improvement of Resin Infiltration (RI), In-office Bleaching (B), Enamel Microabrasion (M) and Resin Infiltration with Double Application of Infiltrant (2RI) on Non-pitted Fluorosis Stains: A Randomized Six-month Interventional Study.

Background: Newer minimally invasive treatment options for improvement in appearance of dental fluorosis stains are gaining popularity in recent years. Objective: To evaluate and compare the clinical success in esthetic improvement of resin infiltration, in-office bleaching with 35% hydrogen peroxide, enamel microabrasion, and resin infiltration with double infiltrant application on nonpitted fluorosis stains. Materials and methods: Seventy two patients aged between 6 and 12 years with nonpitted dental fluorosis stains on the upper anterior teeth were randomly selected and divided into four interventional groups: group 1- resin infiltration (RI), group 2- in-office bleaching using 35% hydrogen peroxide (B), group 3- enamel microabrasion (M), and group 4- resin infiltration with double infiltrant application (2RI). In each group, standardized photographs were taken preoperatively, immediate postoperatively and after 1, 3, and 6 months time interval postoperatively to assess the esthetic improvement (EI) and changes in white/brown surface opacities/stains (SC) using a Visual Assessment Scale (VAS). Results: RI and 2RI showed statistically significant results (p ≤0.05) followed by microabrasion and bleaching, for both the evaluation criteria (EI and SC) at all the follow-up intervals. Conclusion: Resin infiltration is a promising procedure that demonstrated remarkable clinical success for improvement in esthetics of nonpitted fluorosis stains with stable long-term positive outcome. How to cite this article: Garg I, Kumar A, Kumar A. Comparative Evaluation of Esthetic Improvement of Resin Infiltration (RI) In-office Bleaching (B) Enamel Microabrasion (M) and Resin Infiltration with Double Application of Infiltrant (2RI) on Non-pitted Fluorosis Stains: A Randomized Six-month Interventional Study. Int J Clin Pediatr Dent 2022;15(1):20-34.

Physicochemical Properties of Dentine Subjected to Microabrasive Blasting and Its Influence on Bonding to Self-Adhesive Prosthetic Cement in Shear Bond Strength Test: An In Vitro Study.

The aim of this in vitro study was to assess the influence of microabrasive blasting on the physicochemical properties of dentine and shear bond strength (SBS) of self-adhesive resin cement (Maxcem Elite, Kerr, Orange, CA, USA) bonded to the dentine surface. Ninety cylindrical specimens with exposed dentine of human teeth were prepared and divided into three randomized, parallel sample sets A, B, and C. Groups B and C were subjected to abrasive blasting using a micro-sandblasting device (Microetcher IIa, Danville Materials, Carlsbad, CA, USA) with two gradations of Al2O3 abrasives (Group B, abrasion with a gradation of 50 µm; group C, abrasion with a gradation of 27 µm). SEM imaging, profilometry, chemical composition analysis, contact angle measurements, surface free energy, and SBS tests were performed. The resulting data were statistically analyzed using the Statistica software (ver. 13.3, Tibco Software Inc., Palo Alto, CA, USA). Microabrasive blasting caused changes in surface topography, structural features, and the connection strength between the dentin surface and self-adhesive prosthetic cement. Air microabrasion through the multifactorial positive reorganization of the treated surface of dentine is recommended as a pretreatment method in fixed prosthodontics adhesive cementation protocols.

Microabrasión e infiltración como alternativa de tratamiento para Fluorosis Dental severa: reporte de caso / Microabrasão e infiltração como tratamento alternativo para Fluorose Dentária severa: relato de caso / Microabrasion and resin infiltration for treatment of severe Dental Fluorosis: a case report

Resumen La Fluorosis Dental (FD) es un defecto del desarrollo del esmalte tipo hipomineralización atribuido a la exposición crónica y excesiva de fluoruro durante el período de amelogénesis. Clínicamente, en los casos más leves se pueden observar finas líneas blancas y opacas, mientras que en casos moderados y severos las líneas se pueden fundir y formar bandas más gruesas comprometiendo toda la superficie del diente pudiendo estar asociadas con pérdidas de estructura y cambios de color. El tratamiento de la FD puede incluir desde microabrasión, infiltración, aclaramiento y restauraciones con resina compuesta hasta carillas y coronas. El objetivo de este caso clínico fue asociar la técnica de microabrasión e infiltración como alterantiva de tratamiento estético para el manejo de la FD. Paciente de sexo femenino y 9 años que presentaba opacidades blancas en forma de bandas gruesas y pérdidas de estructura dental en los incisivos superiores permanentes (FD severa). Para el tratamiento se optó por realizar microabrasión con ácido clorhídrico, seguido de infiltración con resina de baja viscosidad, logrando un resultado estético favorable y estable a tres meses. Se concluye que la combinación de estas dos técnicas micro-invasivas es una estrategia viable y efectiva para enmascarar efectivamente opacidades producidas por la FD.

Resumo A Fluorose Dentária (FD) é um defeito de desenvolvimento do esmalte do tipo hipomineralização atribuído à exposição crônica e excessiva de fluoreto durante a amelogênese. Clinicamente, os casos leves apresentam finas linhas brancas que acompanham a formação dentária, enquanto casos moderados ou severos apresentam faixas brancas mais amplas acometendo toda a superfície e podem estar associados à perdas estruturais e pigmentações. O tratamento da FD inclui desde microabrasão, infiltração e aclaramento até restaurações com resina composta, facetas e coroas. O objetivo deste caso clínico foi associar as técnicas de microabrasão e infiltração como alternativa de tratamento estético para a abordagem da FD. Paciente do sexo feminino de 9 anos que apresentava nos incisivos superiores permanentes áreas brancas opacas e perda de estrutura (FD severa). Para o tratamento, optou-se por realizar microabrasão com ácido clorídrico, seguido de infiltração com uma resina de baixa viscosidade, atingindo um resultado estético e favorável. Conclui-se que a combinação da microabrasão e da infiltração é uma estratégia viável e efetiva para mascar efetivamente opacidades produzidas pela FD.

Abstract Dental Fluorosis (DF) is a developmental defect of the enamel type hypomineralization attributed to chronic and excessive fluoride exposure during the period of amelogenesis. Clinically, in the mildest cases fine white and opaque lines can be observed, while in moderate and severe cases the lines can melt and form thicker bands, compromising the entire tooth surface, which may be associated with loss of structure and color changes. Treatment of DF can range from microabrasion, infiltration, dental whitening, and composite resin restorations to veneers and crowns. The objective of this clinical case was to associate the microabrasion and infiltration technique as an alternative to aesthetic treatment for the management of dental fluorosis. A 9-year-old female patient presented white opacities in the form of thick bands and loss of tooth structure in the permanent upper incisors (severe dental fluorosis). For the treatment, it was decided to perform microabrasion with hydrochloric acid, followed by infiltration with low viscosity resin, achieving a favorable and stable aesthetic result after three months. It is concluded that the combination of these two micro-invasive techniques is a viable and effective strategy to effectively mask opacities produced by DF.

A conservative approach to rehabilitate a molar-incisor hypomineralization case / Uma abordagem conservadora para reabilitar um caso de hipomineralização molar-incisivo

ABSTRACT Molar incisor hypomineralization is an increasingly common condition in our population. This condition can have great impact on the esthetics, function, and well-being of the child. This paper reports a case of a young patient diagnosed with this condition affecting all the first permanent molars and lower incisors, particularly teeth 31 and 41. The molars were treated with direct resin restorations with cusp coating and the incisors aesthetic was restored with different techniques such as bleaching with sodium hypochlorite, micro-abrasion and resin restorations. This treatment plan aimed to restore the proper teeth function, treat the already existing hypersensitivity and algic complains and to improve the aesthetic of the anterior sector. The presented case shows a conservative approach to deal with the molar incisor hypomineralization condition with satisfactory results after 1-year follow-up.

RESUMO A hipomineralização incisivo-molar (HIM) é uma condição cada vez mais comum na nossa população. Esta condição pode ter um grande impacto na estética, função e bem-estar da criança. Este artigo relata um caso de um paciente jovem diagnosticado com esta condição afetando todos os primeiros molares permanentes e incisivos inferiores, principalmente os dentes 31 e 41. Os molares foram tratados com restaurações diretas em resina composta com recobrimento de cúspides e a estética dos incisivos foi restabelecida com diferentes técnicas, como branqueamento com hipoclorito de sódio, micro-abrasão e restaurações de resina composta. Este plano de tratamento teve como objetivo restaurar a função dos dentes, tratar a hipersensibilidade e as queixas álgicas já existentes e melhorar a estética do sector anterior. O caso apresentado mostra uma abordagem conservadora para lidar com casos de hipomineralização incisivo-molar com resultados satisfatórios após 1 ano de acompanhamento.