Combination injuries 1. The risk of pulp necrosis in permanent teeth with concussion injuries and concomitant crown fractures.

摘要: –  Background:  The reported risk of pulp necrosis (PN) is generally low in teeth with subluxation injuries. A concomitant crown fracture may increase the PN such teeth. Aim:  To analyse influence a trauma-related infraction, enamel-, enamel–dentin- or enamel–dentin–pulp on permanent injury. Material and Methods:  study included 404 incisors injury from 289 patients (188 male, 101 female). Of these teeth, 137 had also suffered fracture. All were examined treated according to standardized protocol. Statistical Analysis:  was analysed separately for immature mature root development by Kaplan–Meier method, log-rank test Cox regression analysis. level significance set at 5%. Risk factors analysis gender, patient age, type, mobility response an electric (EPT) initial examination. Results:  Teeth development: increased enamel (log-rank test: P = 0.002), enamel–dentin P < 0.0001), P < 0.0001) no EPT examination [hazard ratio: 21 (95% confidence interval, CI: 2.5–172.5), P = 0.005]. 12.2 5.0–29.8), P < 0.0001], infraction 5.1 1.2–21.4) P = 0.04] 8 3.3–19.5), P < 0.0001]. Conclusion:  be used identify following injury.