The application of tooth hemisection by using piezosurgery device in dowel crown to save molars with severe defect

Objective To evaluate the clinical effect of application of piezosurgery device in root separation and tooth hemisection combined with dowel crown or fixed bridge in shattered molars.Methods A total of 31 mandibular molars coincided with the criteria were selected for study.Root separation,tooth hemisection,crown lengthening and furcation involvement therapy when needed were performed with piezosurgery device after consummate root canal therapy.Then post and core were restored and combined crowns or bridges were made.All cases were followed up for 2 years.Results All of the teeth functioned well except one failed for the progress of periodontitis.X-ray films showed no obvious alveolar bone loss.Conclusion Satisfactory effect can be obtained by using piezosurgery device in root separation and tooth hemisection combined with dowel crown or fixed bridge to save mandibular molars with severe defect.