Comparative assessment of clinical performance and Streptococcus mutans adherence in primary molars restored with...

To evaluate and compare the clinical efficiency and Streptococcus mutans adherence in primary molars restored with Bioflx and Zirconia crowns (ZCs).

A split-mouth pilot study was conducted on 15 children (40 teeth) aged 4-8 years, with each child receiving both Bioflx and ZCs. Clinical parameters, including retention, color match, staining, and occlusal wear, were evaluated at 1-, 3-, and 6-month follow-ups using the modified USPHS criteria. S. mutans counts were recorded at baseline and at 1-month follow-up. Statistical analysis was carried out using the McNemar-Bowker test and repeated measures analysis.

Both crowns showed 100% retention and no occlusal wear. ZCs demonstrated superior esthetics with 100% Alpha ratings and no staining, while Bioflx crowns exhibited progressive staining and shade mismatches. Both crowns significantly reduced S. mutans counts, with no significant difference between the groups (P = 0.218).

Within the limitations of this 6-month evaluation, ZCs demonstrated superior esthetics, while both Bioflx and ZCs showed comparable retention and similar reductions in S. mutans counts; however, long-term, multicenter studies are necessary to confirm the durability, longevity, and overall clinical performance of both crown types.