Clinical evaluation of two types of fixed partial denture impressions / 华西口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To evaluate the clinic effects of alginate impression and agar/alginate combined impression.</p><p><b>METHODS</b>237 patients of fixed partial denture were collected and divided into group A and group B. Group A was taken impression by aglinate impression, including 81 patients (207 abutments). Group B was taken impression by agar/alginate combined impression, include 156 patients (392 abutments). The impressions were observed by megaloscope, and the number of abutment, the types and number of defect were recorded.</p><p><b>RESULTS</b>In the aglinate impressions, 57.0 percent of abutment had some defect. But in the agar/alginate combined impressions, 36.0 percent of abutment had some defect. There were significant difference between group A and group B in the abutment, air bubbles in cervical margin, unsharpness of the gingival sulcus and shoulders (P<0.05). There were no significant difference between group A and group B in the split and defect of the impressions on the cervical margin.</p><p><b>CONCLUSION</b>There were less defects in the agar/alginate combined impression than in the alginate impression.</p>