Comparison of Three Esthetic Full-coverage Restorations in Primary Maxillary Incisors

Abstract

Purpose: To compare the 12-month clinical outcomes of primary maxillary incisors restored with composite strip crowns (CSCs), NuSmile Preveneered Stainless Steel Crowns (PVSSCs), and NuSmile Zirconia Crowns (ZCs). Methods: One hundred and thirty-five (N=135) teeth in 49 children two to four years with ECC were randomly assigned to one of the three crown groups. Demographic and tooth-related variables at baseline and 12 months were assessed by calibrated examiners. Fisher’s exact or Chi-square tests were used to test associations (P<.05). Results: Children were on average 3.4 years, female (55%), and had mean dmft of 10.6. At 12 months, crown retention was significantly lower for CSCs than PVSSCs or ZCs (79% vs 100% and 95%, P=.002). Partial and complete loss of material was significantly higher in CSCs than PVSSCs or ZCs (29% vs 11% and 0%, P<.001). Teeth restored with composite presented with an increased rate of marginal discrepancies and color change (P<.001). Conclusions: Clinical outcomes were significantly different among CSCs, NuSmile PVSSCs, and NuSmile ZCs at 12 months. CSCs showed significantly reduced clinical success in regards to retention, durability, marginal adaptation, and color compared to PVSSCs or ZCs. Parental esthetic satisfaction was highest for NuSmile ZCs.