387 - Comparison of Tooth Reduction Among Pediatric Crown Types

Abstract:

Purpose: To compare the amount of tooth structure removed during preparation of primary posterior teeth for three pediatric crown materials: zirconia, BioFlx, and stainless steel crowns.

Methods: Thirty primary posterior typodont teeth were divided into three groups and assigned to receive zirconia crowns (Sprig Pediatric Dentistry), BioFlx crowns (NuSmile), or stainless steel crowns (3M ESPE). Each tooth underwent standardized crown preparation using the EZ-Prep bur system, following the manufacturer-specific reduction guidelines for each crown type. Tooth weight was recorded before and after preparation, and the difference in weight was used as a quantitative measure of tooth structure removed. Statistical analysis was performed using the Kruskal–Wallis test, followed by Dunn’s test with the Bonferroni correction.

Results: The Kruskal–Wallis test demonstrated a statistically significant difference in tooth structure removal among the three crown groups (P < .001), indicating that at least one group differed in median reduction. Dunn’s test with the Bonferroni correction analysis revealed statistically significant differences between all crown types. Stainless steel crowns required the least amount of tooth reduction (median= 0.0618g, IQR = 0.0081), followed by BioFlx (median = 0.0855g, IQR = 0.0061), while zirconia requiring the largest amount of tooth reduction (median = 0.1201g, IQR = 0.0054). Pairwise comparisons showed significant differences between SSC and BioFlx (P = .03), SSC and zirconia (P < .001), and BioFlx and zirconia (P = .03).

Conclusions: Significant differences exist in the amount of tooth reduction required for zirconia, BioFlx, and stainless steel crowns on primary posterior teeth.

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