retention force造句怎么写

Objective The friction coefficient between the clasp and enamel was measured as one base of calculating the retention force of clasp quantitatively.

Conclusion: the number, site and dislocation direction of the attachment affect retention force of bar-clip implant overdenture.

The effect of different luting cements on casting metal full crown retention force

Objective: to study on retention force of dentures with various amount and distribution of attachments, provided reference to clinic use.