Abstract: Objective To compare the application of attachments made of traditional resin and flowable resin in invisalign treatment without brackets. Methods Twentytwo patients, 232 attachments in total were selected from the Stomatology Hospital of Lianyungang from 2019 to 2020. Operation time was compared; defect, shedding rate of two kinds of attachments, differences in different shapes of attachments and different positions of the tooth were compared at the time of bonding and one year after the bonding. Results The operation time of attachments made of flowable resin was shorter than traditional resin; the difference was statistically significant (P<0.05). At the time of bonding and one year after bonding, the shedding rate of the optimized attachment was lower than that of the traditional attachment; difference was statistically significant (P<0.05). At the time of bonding, the shedding rate of the anterior attachment was lower than that of the posterior attachment; difference was statistically significant (P<0.05). Conclusion In invisalign treatment without brackets, attachments made of flowable resins are suitable for the clinic; the optimized attachment is more suitable for the clinic than the traditional attachment; when the attachments are bonded, the template for posterior area can be cut to reduce the loss of the attachment.

Key words: Key Words:invisalign, attachment, flowable resin, orthodontics