RESUMO
Objective:To investigate the effects of pulsed neodymium yttrium aluminium garnet(Nd:YAG)laser in combination with scaling and root planing(SRP)in the treatment of moderate and server chronic periodontitis.Methods:30 patients with moderate or server chronic periodontitis were included in this split-mouth single blind randomized controlled clinical trial.The contralateral teeth with chronic periodontitis in the patients were randomly divided into 2 groups(n =55)and treated by SRP(group A)and SRP +Laser (group B)respectively.At base line,3 and 6 months after treatment.The clinical parameters including periodontal probing depth (PPD),vertical clinical attachment loss(CAL-V),bleeding index(BI)and CBCT data including alveolar bone density(ABD)and height(ABH)were measured.Results:3 months after treatment,the PPD and BI of group B was lower than those of group A(P <0.05).The gained CAL-V of group B was higher than that of group A(P <0.05).6 months after treatment,group B showed higher CAL-V and ABD at the mesial and distal directions than group A(P <0.05).Conclusion:SRP combined Nd:YAG laser is more ef-fective than SRP in the treatment of moderate and server chronic periodontitis.