The Effect of One‐Step vs. Two‐Step Impression Techniques on Long‐Term Accuracy and Dimensional Stability when the Finish Line is within the Gingival Sulcular Area

Levartovsky, Shmuel; Zalis, Maayan; Pilo, Raphael; Harel, Noga; Ganor, Yehuda; Brosh, Tamar

doi:10.1111/jopr.12062

Cited by 32 publications

(45 citation statements)

References 29 publications

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“…The results of the present study corroborate with other studies 7,[12][13] which claim that dimensional accuracy is not affected by the impression technique. Thus, the first hypothesis was rejected.…”

Section: Discussionsupporting

confidence: 83%

“…Moreover, impressions created with this type of elastomeric impression material can be obtained by different impression techniques [7][8] . Some authors 8,[10][11][12][13][14][15] have demonstrated that the impression technique is a critical factor which directly influences the dimensional accuracy. However, in this study, the dimensional accuracy of a partially edentulous mandibular arch is related more to the type of impression material than the impression technique 7,[16][17] .…”

Section: Discussionmentioning

confidence: 99%

“…Several factors affect the dimensional accuracy of elastomeric impression material molds, such as the type of impression material used and its adhesion to the tray, viscosity, hydrophilicity, thickness, by-product formation, the time spent during cast pouring, incomplete elastic recovery, and polymerization/thermal shrinkage [7][8] . Several studies showing differences in dimensional accuracy between the impression techniques are found in literature [8][9][10][11][12][13][14][15] . Conversely, other studies show similar outcomes between different impression techniques 7,[16][17] or only small differences within a specific group of elastomeric impression materials 18 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the majority of these studies use a cast with abutments and grooves to assess the linear accuracy of impressions and not a cast simulating clinical situations. Another issue within the evaluation of impression procedures is the volume of impression material used 9,13 . A mold with a non-uniform thickness of impression material, either by excessive or thin zones in the same impression, may show different shrinkage levels, thereby decreasing the dimensional accuracy of the stone casts 13 .…”

Section: Introductionmentioning

confidence: 99%

“…Another issue within the evaluation of impression procedures is the volume of impression material used 9,13 . A mold with a non-uniform thickness of impression material, either by excessive or thin zones in the same impression, may show different shrinkage levels, thereby decreasing the dimensional accuracy of the stone casts 13 . This is commonly observed with partially edentulous patients, a common situation in clinical dentistry.…”

Section: Introductionmentioning

confidence: 99%

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Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

Vitti

Feitosa

Bacchi

et al. 2017

RGO, Rev. Gaúch. Odontol.

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ObjectiveThe purpose of this in vitro study was to assess and compare the dimensional accuracy of three impression techniques: 1-step putty/light-body, 2-step putty/light-body, and the monophase technique. Methods A partially edentulous standard stainless steel mandibular arch cast with reference points on the teeth was used to make the impressions. The anteroposterior and transverse distances were measured. All impressions were made with a polyvinyl siloxane using stock metallic (1-and 2-step putty/light-body techniques) or acrylic resin (monophase technique) trays. The monophase impressions were made using a light-body material and the 1-and 2-step putty/light-body impressions with putty and light-body materials. After impression procedures, the accuracy of each technique was assessed measuring the stone casts (n = 5) poured from the impressions using a microscope at 30x magnification and at 0.5 µm accuracy. The data were analyzed statistically using 2-way ANOVA and Tukey's test (p<0.05). Results Stone casts made by all techniques had significantly negative linear changes (shrinkage). The anteroposterior distances showed more dimensional changes than the transverse distances. The edentulous side showed more shrinkage than the anteroposterior side. ConclusionNo differences between the impression techniques were found, but significant dimensional changes were observed.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

Vitti

Feitosa

Bacchi

et al. 2017

RGO, Rev. Gaúch. Odontol.

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Disposable plastic trays and their effect on polyether and vinyl polysiloxane impression accuracy—an in vitro study

et al. 2020

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Objectives To evaluate the dimensional accuracy of impressions taken by use of disposable stock plastic trays and to compare performance with that of metal trays. Materials and methods From a metallic model incorporating three precision balls and three abutment teeth, one-step dual-phase polyether (PE) and vinyl polysiloxane (VPS) impressions were taken using either metal or disposable plastic trays (n = 10 for each of the resulting four test groups). Respective plaster cast scans were aligned with the reference dataset to evaluate global (distance and angle deviations) and local (trueness and precision) accuracy. Analyses of variance (ANOVA) were conducted to determine group differences. Results For all impression tray and material combinations, global accuracy was good (mean distance changes < 100 μm) with greatest deviations being observed for distances exceeding one quadrant of the dental arch. In general, distances measured in the plaster casts were too short. Only VPS impressions with plastic trays showed a different behavior with a large percentage of cross-arch distances exceeding the reference value. Mean local accuracy ranged between 6 and 14 μm (trueness), and 6 and 16 μm (precision). On abutment tooth level, metal trays were associated with a significantly better precision (p = 0.015). Conclusions The observed distortions of the studied impression trays and materials are small and should enable satisfying clinical impression-taking. Clinical relevance Cleaning and processing of metal trays before re-use are time-consuming. Especially for patients' management with single crowns and small fixed dental prostheses, disposable plastic trays can be a viable and cost-effective alternative.

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Clinical evaluation comparing the fit of all-ceramic crowns obtained from silicone and digital intraoral impressions based on wavefront sampling technology

Pradíes

Zarauz

Valverde

et al. 2015

Journal of Dentistry

118

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The Effect of One‐Step vs. Two‐Step Impression Techniques on Long‐Term Accuracy and Dimensional Stability when the Finish Line is within the Gingival Sulcular Area

Abstract: When using the two-step putty-wash impression technique, pouring of the impressions may be postponed up to 30 hours; however, when using the one-step impression technique, pouring should be performed within 2 hours.

Cited by 32 publications

References 29 publications

Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

Dimensional accuracy of different impression techniques of partially edentulous mandibular arch

Disposable plastic trays and their effect on polyether and vinyl polysiloxane impression accuracy—an in vitro study

Clinical evaluation comparing the fit of all-ceramic crowns obtained from silicone and digital intraoral impressions based on wavefront sampling technology

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