ObjectiveTo investigate the 2-year curative effect of full ceramic onlay in the treatment of early vital cracked teeth.

MethodsA randomized controlled study was conducted to evaluate the 2-year effects of all-ceramic onlay and full crown on the restoration of early vital cracked teeth.One hundred and twenty-eight affected teeth from 128 patients were selected and stratified based on the clinical symptoms, layer one: occlusal discomfort; layer two: occlusal discomfort accompanied by cold and hot irritation and pain.The affected teeth in each layer were divided into the onlay group and full crown group according to the random number table method.The difference of 24 h postoperative pain was compared between two groups.All cases were followed-up for 2 years.The curative effects of the two restoration methods and clinical symptom stratification in the treatment of early vital cracked teeth with living pulp were analyzed.

ResultsThe postoperative pain scores in onlay group of layer one and two were lower than that in full crown group(P < 0.01).The differences of the effective rate between two groups in layer one and two were not statistically significant(P>0.05).The effective rate of two groups in layer one was higher than that in layer two(P < 0.05).

ConclusionsThe full ceramic onlay is an effective method in the restoration of early vital cracked teeth, and has little postoperative pain.Early treatment can obviously improve the effective rate of treatment.