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. 2024 Aug 27;17(17):4221.
doi: 10.3390/ma17174221.

Dimensional Accuracy of Novel Vinyl Polysiloxane Compared with Polyether Impression Materials: An In Vitro Study

Moritz Waldecker  1 , Stefan Rues  1 , Peter Rammelsberg  1 , Wolfgang Bömicke  1
Affiliations

Dimensional Accuracy of Novel Vinyl Polysiloxane Compared with Polyether Impression Materials: An In Vitro Study

Moritz Waldecker et al. Materials (Basel). .

Abstract

Transferring the intraoral situation accurately to the dental laboratory is crucial for fabricating precise restorations. This study aimed to compare the dimensional accuracy of a new hydrophilic quadrofunctional vinyl polysiloxane (VPS) and polyether (PE), in combination with different impression techniques (mono-phase single step or dual-phase single step). The reference model simulated a partially edentulous mandible. Stainless-steel precision balls were welded to specific teeth and were used to detect dimensional deviations. Fifteen impressions were made for each of the following four test groups: (1) VPS mono-phase, (2) PE mono-phase, (3) VPS dual-phase, and (4) PE dual-phase. Global accuracy was measured by deviations from the reference model, while local accuracy focused on the trueness and precision of abutment tooth surfaces. Statistical analysis was conducted using ANOVA (α = 0.05). All distances were underestimated, with the highest global inaccuracies for the cross-arch distance, ranging from -82 µm to -109 µm. The abutment tooth surfaces showed excellent local accuracy for all the materials and techniques, with crown surface trueness < 10 µm and precision < 12 µm. Inlay surfaces had higher inaccuracies (trueness < 15 µm, precision < 26 µm). Within the limitations of this study, all impression materials and techniques can be used to produce models with clinically acceptable accuracy.

Keywords: accuracy; impression technique; polyether; vinyl polysiloxane.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Occlusal view of the reference model.
Figure 2
Figure 2
Defined distances between center of each precision ball (turquoise dashed) and between center points on margin level of prepared teeth (blue dotted). LM, left first molar; LP, left first premolar; RP, right first premolar; P1, center point of precision ball 1; P2, center point of precision ball 2; P3, center point of precision ball 3.
Figure 3
Figure 3
Distance deviations displayed for distances between precision ball center points P1, P2, and P3.
Figure 4
Figure 4
Distance deviations displayed for distances between abutment teeth measured at margin level and at surface level.
Figure 5
Figure 5
Accuracy (trueness and precision) of prepared teeth.
See this image and copyright information in PMC

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