Abstract
BackgroundVarious factors like implant angulation, type of impression material and tray type affects the implant impression accuracy. To date limited in-vitro studies were carried out on the implant impression accuracy of unilateral partially edentulous arches. The aim of this research was to evaluate the effects of 0o, 15o and 25o implant angulations on impression accuracy in simulated master casts of unilateral partially edentulous situation using different impression materials and tray selections.Material and Methods30 replicas (N = 30) of a resin matrix (control) containing four implant analogues placed unilaterally from the midline till the region of second molar at an angulation of 00, 00, 150 and 250 to the vertical axis of the ridge respectively were obtained by using three impression techniques (stock metal tray, closed custom tray, and open nonsplinted custom tray) and two different impression materials (Polyvinyl-siloxane and polyether). Specific dimensions of the resultant casts were measured using coordinated measuring microscope. Mean linear changes were calculated and statistically analyzed using analysis of variance (ANOVA) and Tukey’s post-hoc procedures (p< 0.05).ResultsThe casts obtained from all three impression techniques had significant differences in dimensions (p<0.05) as compared to that of master model irrespective of impression materials. Comparing the techniques with regard to the parallel implants, no statistical significant difference (p<0.05) was observed with custom tray techniques (closed/open). Whereas while comparing parallel versus non parallel, open tray technique showed superior accuracy compared to closed tray technique as the angulation increased more than 15 degrees.ConclusionsThe influence of material and technique appeared to be significant for highly non axial implant angulations (p< 0.05), and increased angulation tended to decrease impression accuracy. The open tray technique was more accurate with highly nonaxially oriented implants for the small sample size investigated. Key words:Implant impressions, partially edentulous arch, angulated implants.
Highlights
Osseointegrated implants are used for the rehabilitation of complete and partially edentulous patients
In the group I experimental casts obtained using stock tray impression technique exhibited more deviations (0.1077, 0.1672 and 0.1971) (Table 2) and less deviations (0.0624, 0.0960 and 0.1005) were observed with open unsplinted custom tray impression technique as the implant angulation increases from the midline to posterior region compared to master cast
The post hoc Tukey’s test (Tables 3,4) indicated that irrespective of impression material, open nonsplinted tray impression technique exhibited improved accuracy compared to closed custom technique with parallel implants (A2) but not statistically significant (p
Summary
Osseointegrated implants are used for the rehabilitation of complete and partially edentulous patients. Literature reveals limited information about the impression accuracy of partially edentulous arch with multiple non parallel implants compared to completely edentulous arch. The purpose of this in vitro study was to compare the accuracy outcomes of the nonsplinted open and closed-tray implant impression techniques using two different elastomeric impression materials with straight and angulated implants placed unilaterally in a partially edentulous mandibular model. The aim of this research was to evaluate the effects of 0o, 15o and 25o implant angulations on impression accuracy in simulated master casts of unilateral partially edentulous situation using different impression materials and tray selections. The open tray technique was more accurate with highly nonaxially oriented implants for the small sample size investigated
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