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Results of the clinical evaluation of retention criterion
| 6 m | 12m | 18 m | 24 m | |||||
|---|---|---|---|---|---|---|---|---|
| The control group | a | 55(94.8%) | 54(100%) | 54(100%) | 54(100%) | |||
| c | 3(5.2%) | 0 | 0 | 0 | ||||
| The experimental group | a | 61(92.4%) | 58（96.7%） | 56(100%) | 56(100%) | |||
| c | 5(7.6%) | 2（3.3%） | 0 | 0 | ||||
| Fisher’s exact P-value | 0.722 | 0.497 | ||||||
