VD and working procedure.Experiments showed that major of the LF step foreign inclusions are aluminium sesquioxide. spotted non-deforming inclusion and sulphuret.
But in the couse of lathing and dawdling,the trouble of deformation,empyrosis and crack lf parts often appears which affects seriously the processing quality.
Objective: To evaluate the diagnostic efficacy of the bitewing radiograph(BWR),clinic examination(CE) and laser fluorescence examination (LF) for detection of initial posterior approximal caries .