Abstract: Abstract Aim: To evaluate the outcome of mobile teeth which are greater than Ⅱ degrees with advanced periodontitis after periodontal basic treatment plus supportive periodontal therapy (SPT). Methods: 381mobile teeth including 118 TM2 and 23 TM3 were selected from 57 adult patients. Each tooth received periodontal basic treatment and supportive periodontal therapy (SPT). BOP (the percentage of positive sites), Sulcus bleeding index (SBI), Tooth Mobility(TM) had been recorded at the initial periodontal visit (T0), one month after basic periodontal therapy (T1) and 24 month after basic periodontal therapy (T2) after probing depth (PD) assessment. Results:(i)Clinical parameters including TM,PD,BOP,SBI at all levels of tooth mobility improved significantly after therapies (P<0.05). (ii)The percentage of teeth in TM2 group retained was 95.7% and 39.1% of the teeth in TM3 group can also be kept in function. Conclusions: Clinical parameters of mobile teeth can be improved after periodontal basic treatment plus supportive periodontal therapy (SPT). Most TM2 teeth can be retained. Although Teeth of originally tooth mobility “3”have high missing rate (over 50%), it is worth trying to retain.

Key words: periodontitis, mobility, periodontal therapy