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Updated: Jul 9, 2026
Measuring the Complete-arch Distortion of an Optical Dental Impression
Published on: May 30, 2019
[Clinical evaluation of two types of fixed partial denture impressions]
Lian-shui Shi1, Li-kai Wang, Xiao-jun Zhang
1Department of Prosthodontics, College of Stomatology, Nanchang University, Nanchang 330006, China.
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.
Conclusion:
There were less defects in the agar/alginate combined impression than in the alginate impression.
