Assessment of microbial growth in various aligner materials

Area of Science:

• Dentistry
• Microbiology
• Biomaterials Science

Background:

• Microbial accumulation on clear aligners can compromise dental and periodontal health.
• Maintaining proper hygiene is crucial during clear aligner therapy.

Purpose of the Study:

• To evaluate and compare microbial growth on three distinct clear aligner materials: Invisalign, Straumann Clear Correct, and Novoalign.
• To assess the impact of material composition and surface characteristics on microbial colonization.

Main Methods:

• An in vivo observational study involving 30 subjects, categorized into three groups based on aligner type.
• Microbial samples collected from unused aligners (T0) and after 14 days of intraoral use (T1).
• Culturing on Soybean Casein Digest Agar and Mannitol Salt Agar to quantify Streptococcus mutans, Staphylococcus aureus, and Lactobacillus spp.

Main Results:

• All tested clear aligner materials demonstrated microbial colonization.
• Differences in microbial growth were observed, potentially linked to material composition and surface properties.
• Specific bacterial species like Streptococcus mutans, Staphylococcus aureus, and Lactobacillus spp. were quantified.

Conclusions:

• Microbial colonization occurs on all evaluated clear aligner materials.
• Material characteristics influence the extent of microbial accumulation.
• Reinforcing the importance of rigorous oral hygiene practices during clear aligner treatment is essential.