科研之友
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摘要
To evaluate the retention properties of the novel 'C'-shaped molar bands at a laboratory level. Resin-modified glass ionomer cement (RMGIC) was used as a luting agent for the novel C-shaped molar band. The mechanical properties of the band were examined and the retention performance was characterized in the mesial, distal and vertical directions. A clinical trial was conducted using a spilt-mouth design on 50 patients. The novel C-shaped molar bands fit most molars without a repeated try-in process. The use of both nano-HA coating and RMGIC enhanced the tensile (8.00 +/- 1.8 MPa) and shear strengths (27.17 +/- 8.6 MPa) of the molar bands, leading to high retention in vertical, mesial and distal directions (p < 0.001). In clinical trials, the C-shaped molar bands had a failure rate (15%) comparable to that of traditional bands, and 93% of the failed bands demonstrated an adhesive remnant index score of 0, corroborating the observation that no luting agent residue remained on the tooth surface in most cases. The novel C-shaped molar bands appear to be a promising appliance that requires further clinical investigations, and may be used effectively in orthodontics.
