[Clinical evaluation of two types of fixed partial denture impressions].
OBJECTIVE
To evaluate the clinic effects of alginate impression and agar/alginate combined impression.


METHODS
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.


RESULTS
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.


CONCLUSIONS
There were less defects in the agar/alginate combined impression than in the alginate impression.
Shi
Lian-shui
LS
Department of Prosthodontics, College of Stomatology, Nanchang University, Nanchang 330006, China.
Wang
Li-kai
LK
Zhang
Xiao-jun
XJ
D000464:Alginates; D003760:Dental Impression Materials; D003761:Dental Impression Technique; D003830:Denture, Partial, Fixed; D005881:Gingiva; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D006801:Humans; D003765:Models, Dental
D000464:Alginates; D003760:Dental Impression Materials; D006603:Hexuronic Acids; D020723:Glucuronic Acid