A Synergistic Approach with Microabrasion and Resin Infiltration in the Management of Dental Fluorosis

INTRODUCTION

Dental fluorosis is a developmental condition characterized by hypomineralization of the enamel due to excessive fluoride intake during tooth development. This condition manifests in a spectrum of severity, ranging from subtle white spots to severe brown mottling and discoloration.^[1] It primarily results from the consumption of fluoride-contaminated water, affecting an estimated 62 million individuals across 17 out of 32 states in India, where both dental and skeletal fluorosis are prevalent.^[2]

H. Trendley Dean developed a six-point scale to classify the severity of dental fluorosis, which remains a standard method for assessing enamel involvement. Dean’s index categorizes enamel into six distinct classifications: normal, questionable, very mild, mild, moderate, and severe. While mild to moderate fluorosis is predominantly a cosmetic concern, its treatment remains a significant clinical challenge.^[3]

Traditionally, bleaching has been used as a treatment option to improve the appearance of fluorotic teeth. However, while bleaching offers aesthetic benefits, it may exacerbate some of the condition’s inherent challenges, such as increasing the visibility of opaque areas, causing uneven colour distribution, and inducing temporary tooth sensitivity.^[4] Additionally, bleaching can weaken enamel, increasing its susceptibility to decay by demineralizing it and lowering its microhardness.^[5]

To overcome the limitations of bleaching, more invasive approaches like veneers, crowns, macroabrasion, and megaabrasion have been employed. While these methods offer aesthetic improvements, they often result in substantial loss of healthy tooth structure.^[6]

In contrast, minimally invasive procedures, such as microabrasion and resin infiltration, are gaining popularity due to their effectiveness in improving the appearance of fluorotic teeth without the need for extensive enamel removal.^[7] Microabrasion utilizes a combination of mechanical abrasion and acidic abrasive slurry to remove superficial stains and discoloration, offering a non-invasive way to enhance enamel appearance. Resin infiltration, on the other hand, addresses deeper discoloration by penetrating the enamel’s subsurface pores with a low-viscosity resin.^[3] This technique not only improves the aesthetic appearance by mimicking the natural translucency of healthy enamel but also helps to stabilize and strengthen the treated enamel.

This systematic review aims to evaluate and summarize the current evidence regarding the combined use of resin infiltration and microabrasion for the treatment of dental fluorosis. By focusing on these minimally invasive methods, this review seeks to provide a comprehensive overview of their efficacy and benefits, while avoiding the potential drawbacks associated with bleaching. Furthermore, these techniques promise to minimize the risk of enamel demineralization and sensitivity, ensuring a more durable and aesthetically pleasing outcome.

MATERIAL AND METHODS

The systematic review adhered to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline.

Exclusion criteria:

• In vitro studies.

• Studies involving bleaching were conducted within one week prior to the treatment.

• Non-English publications.

• Studies focusing on other types of white spot lesions unrelated to dental fluorosis.

Initially, the search approach was established for the MEDLINE database and implemented on PubMed utilizing controlled vocabulary known as Medical Subject Headings (MeSH) terms. The other databases include Scopus, Web of Science, Google Scholar, Research Gate, and Science Direct, to identify relevant studies on the combined use of microabrasion and resin infiltration for the management of mild to moderate dental fluorosis. The search strategy was designed to capture all pertinent studies up to the date of the search, with no restrictions on publication year.

Duplicate records were identified and removed using Zotero reference management software. The titles and abstracts of the remaining records were then screened using Rayyan QCRI, a web-based tool for systematic reviews. The articles were selected based on their eligibility criteria. Two independent reviewers conducted the initial screening process, and any conflicts were resolved by a third reviewer [Figure 1].

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Figure 1:

Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines flowchart 2020.

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The risk of bias in the included studies was evaluated using standardized tools, with randomized controlled trials assessed using RoBvis 2.0 and case reports evaluated using the Joanna Briggs Institute’s critical appraisal checklist. All the included studies were analysed for the risk of bias. The quality of the included case reports was assessed using the Joanna Briggs Institute (JBI) critical appraisal checklist. Each study was evaluated for methodological quality, including aspects such as participant selection, intervention integrity, outcome measurement, and statistical analysis. A traffic light plot was generated using the RoBvis tool to visualize the risk of bias across randomized controlled trials [Figure 2]. Two reviewers independently extracted data from the included studies using a pre-piloted data extraction form.

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Figure 2:

Traffic plot reporting risk of bias for included in vivo studies.

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RESULTS

DISCUSSION

Enamel, the hardest tissue in the human body, is primarily composed of hydroxyapatite (Ca₁₀(PO₄)₆(OH)₂), structured into tightly packed enamel rods. These rods form intricate patterns and interweave to create enamel’s unique strength and durability.^[8,9] However, in dental fluorosis, excessive fluoride incorporation during enamel development leads to the formation of fluorapatite (Ca₁₀(PO₄)₆F₂), altering the enamel’s structure and resulting in visible discoloration and increased surface roughness. Fluorosed enamel often displays aprismatic zones, where gaps between enamel rods disrupt the regular arrangement, further contributing to its irregular surface morphology and compromised appearance.^[10,11]

Conventional treatments like bleaching, while effective in lightening discoloration, introduce new challenges. The oxidative action of hydrogen peroxide in bleaching agents dissolves enamel prisms and increases surface porosity. Studies report demineralization depths of 63.71 µm to 132.06 µm following bleaching, alongside honeycomb-like pores observed under scanning electron microscopy.^[5] This process not only compromises enamel hardness but also predisposes teeth to cariogenic challenges. In contrast, the combined use of microabrasion and resin infiltration addresses both aesthetic and structural concerns without exacerbating enamel damage.

Microabrasion works by mechanically and chemically abrading superficial enamel layers, effectively removing stains and smoothing the surface. Resin infiltration complements this by penetrating subsurface porosities with low-viscosity resin, altering the enamel’s refractive index and restoring translucency.^[9] This synergistic approach bridges the gap between minimally invasive interventions and comprehensive aesthetic restoration. As highlighted in the systematic review, Singhania et al. demonstrated that this combination yields superior fluorescence gain and colour masking compared to standalone treatments.^[12]

Patient satisfaction was a prominent outcome across all included studies. Poorvi Saxena et al.^[11] highlighted the psychosocial benefits of treatment, noting improved self-confidence and reduced social stigma associated with fluorosis. These results underscore the broader impact of dental aesthetics on quality of life and the importance of effective interventions in managing fluorosis. Unlike bleaching, the combined approach minimizes postoperative sensitivity and uneven discoloration, further enhancing its appeal.^[12-14]

Durability is another strength of this combination, with studies reporting sustained aesthetic improvements up to six months post-treatment. While the reinforcing effect of resin infiltration suggests potential for long-term stability, the lack of extended follow-up data remains a limitation. Future studies with longer observation periods are crucial for establishing the treatment’s longevity.

Operator skill significantly influences the success of this approach. Precision in enamel preparation and uniform resin application are essential to avoid over-abrasion and ensure effective infiltration.^[13] Standardized protocols and clinician training will be key to ensuring consistent outcomes across diverse settings. Despite these technical requirements, the treatment offers a viable option for mild to moderate cases, though its efficacy for severe fluorosis remains limited.

CONCLUSION

In conclusion, the combined use of microabrasion and resin infiltration is an effective, minimally invasive solution for managing dental fluorosis. It addresses both surface irregularities and subsurface defects, delivering significant aesthetic improvements while preserving enamel integrity. While current evidence is promising, further research is necessary to validate its long-term efficacy, explore its application in severe cases, and optimize protocols for broader clinical adoption. With continued refinement, this approach holds the potential to become a cornerstone of modern aesthetic dentistry.