The Effect Of Detachable PFM (Porcelain Fused To Metal) Fixed Bridges On Periodontal Microbial Of The Abutment Teeth

Objective To research about the effect of detachable PFM (porcelain fused to metal) fixed bridges on periodontal microbial of the abutment teeth.Methods periodontal bacterial floras of patients wearing detachable PFM fixed bridges were cultivated in anaerobic condition and analized.Results The percentage of the periodontal bacteria constitutes does not show a remarkable difference , at the different teeth and the same teeth but not the same part which are in the same period . In 3 months, the compose of bacterial has much more changes than that of before, but after 3 months, the compose of bacteria has come back to normal state guideline. The 3 bacterial ( P.g P.i F.n) have been checked out except Aa after 1,3,6,9,12months respectively, the percentage has a gradual uptrend. The percentage of the second molars is much higher than the second premolars, which does not show a remarkable difference.Conclusion This investigation can provide theoretical basis for the prevention of periodontal diseases in patients wearing detachable PFM fixed bridges.