Cast accuracy obtained from different impression techniques at different implant angulations (in vitro study)

Elshenawy, Enas A.; Alam-Eldein, Ahmed Mohamed; Elfatah, Fadel A Abd

doi:10.1186/s40729-018-0118-6

Cited by 30 publications

(39 citation statements)

References 26 publications

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“…These challenges can be due to the presence of teeth adjacent to implants, an increased number of implants, or alterations to implant orientation [4][5][6]17]. Therefore, in accordance with earlier observations, it can be speculated when the implants are parallel, one specific technique has no advantage over another [10][11][12].…”

Section: Discussionmentioning

confidence: 83%

“…Clinically, the new tray design has multiple potential advantages such as ease of use, simplicity, time efficiency, convenience and less material usage in comparison to the splinting technique. Clinically, however, it is frequently observed that the implants are not parallel and have an angle between them that imposes an extra challenge on the impression, as illustrated in multiple studies [5,[9][10][11][12]. Thus, before a modified tray design can be recommended as a replacement for splinting, it is important to evaluate its accuracy in scenarios that are clinically more relevant, such as the presence of a moderate angle between the implants.…”

Section: Introductionmentioning

confidence: 99%

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Effect of modified tray design on accuracy of different impression techniques for parallel and divergent implants

et al. 2020

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This study evaluated the effect of a modified tray design on the accuracy of implant impressions in comparison with the non-splinted and splinted impression techniques. Two titanium frameworks were produced to fit two parallel implants and two divergent implants with a 15 o angle. According to the frameworks employed, two acrylic resin master models were fabricated. For each model, 10 impressions were taken with every technique. The maximum framework principal strain was calculated for every generated cast. For the parallel implant model, the strains of the nonsplinted (118.4 με), splinted (89.0 με), and modified tray design impression (49.4 με) techniques were statistically similar (P = 0.16). For the divergent implant model, all the impression techniques showed a considerably higher strain than the parallel implant model. The splinted (287.0 με) and the modified (262.9 με) tray design impression techniques showed similar strains for the divergent implant model, which were significantly less than the strains for the non-splinted impression (518.0 με) technique (P < 0.05). Therefore, for two parallel implants, all the impression techniques exhibited similar accuracy. When angulation existed between the implants, the splinted and the modified tray design impression techniques were more accurate than the non-splinted impression technique.

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Section: Discussionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Effect of modified tray design on accuracy of different impression techniques for parallel and divergent implants

et al. 2020

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“…In some of the studies that follow, unlike the present study, the type of splinting material had an impact on the accuracy of the impression. (11)(12)(13)18) Vigolo et al argued that attaching the impression copings using Duralay splinting material is effective in reducing dimensional changes. (13) They used the profile projector method for the assessment of their samples.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Effect of Two Types of Autopolymerizing Acrylic Resin Splints on Dimensional Accuracy in Open Tray Impression Technique

Neshandar

Baloch

Mousavisedighi³

et al. 2019

J Res Dentomaxillofac Sci

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Background and Aim: One of the main goals in the fabrication of an implant-supported prosthesis is to build a superstructure with passive fitness. If this fails, it will lead to the failure of the implant components. This study aimed to investigate the effect of Duralay and Pattern Resin splinting materials on dimensional accuracy in the open tray impression technique. Materials and Methods:An edentulous acrylic model was developed. In the lateral teeth area, two implants (CMI, Neobiotech Co.) were placed perpendicularly and parallel to each other. The implants were cemented with cyanoacrylate. Pattern Resin (n=10) and Duralay (n=10) were used to splint the impression copings, and the impression was taken using the open tray technique. The main casts (20 pieces) were made with Vel-Mix type IV plaster using a vacuum mixer. The dimensional changes of each group were measured using a multi-axial coordinator. T-test was used to analyze the data. Result: The mean dimensional changes of implant position transfer at the x-axis were 5.04±0.37 μm for Duralay and 5.58±0.13 μm for Pattern Resin. The mean dimensional changes of implant position transfer at the y-axis were 7.01±0.49 µm for Duralay and 6.78±0.15 µm for Pattern Resin. The mean dimensional changes of implant position transfer at the z-axis were 7.62±0.71 µm for Duralay and 6.86±0.12 µm for Pattern Resin. T-test showed that the difference between the two groups was not statistically significant (P>0.05). Conclusion: According to the results, Duralay and Pattern Resin were not significantly different regarding dimensional changes in the open tray impression technique.

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“…Many researchers, including Spector et al and Rodney et al have shown that the open tray method is more accurate than the closed tray technique [8]. The type of the impression material, too, affects the accuracy of the final prosthesis; it has been shown that the accuracy of the impression increases with an increase in the hardness of the impression material [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the accuracy of fixture-level impression making after splinting prosthetic components

2020

Biointerface Res Appl Chem

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Considering the effects of different impression-taking techniques on the dimensional accuracy of the final cast and controversies over the best technique in implant dentistry, the present study was undertaken to evaluate the effects of three different open-tray impression techniques on the dimensional accuracy of final casts for implants. A two-piece metallic index was prepared and a patient’s jaw was simulated by placing self-cured acrylic resin in the lower part of the index. Then 2 holes were produced in the acrylic resin at a specific distance from each other, and the analogs were placed in these holes. Three different open-tray impression techniques were evaluated using the upper segment of the index, which mimicked the specific tray. The dimensional accuracy of the casts was evaluated by comparing the distances between the predetermined points on the implant analogs and the positions of the points with similar distances on the master model. A digital caliper (accurate to 0.01 mm) was used to measure the distances. The differences in the measurements on the final casts were analyzed with SPSS 16, using Kruskal-Wallis test. Post hoc Mann-Whitney U test was used for two-by-two comparisons. There was a significant difference between the group in which the analogs and impression copings were not splinted and the group with impression coping splinting without analog splinting and the group with simultaneous splinting of the impression copings and implant analogs, in relation to distances between similar points on the master model. In this context, the second and third techniques better reconstructed the positions of the points. Splinting of impression copings with Duralay acrylic resin prevented the movement of impression copings during the impression-taking procedure and despite an increase in the accuracy of impression taking during splinting of analogs by Duralay acrylic resin, the increase in accuracy was not significant statistically; therefore, splinting of the impression copings without splinting of the analogs is recommended due to an increase in impression-taking accuracy and facilitation of laboratory procedures.

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Cast accuracy obtained from different impression techniques at different implant angulations (in vitro study)

Cited by 30 publications

References 26 publications

Effect of modified tray design on accuracy of different impression techniques for parallel and divergent implants

Effect of modified tray design on accuracy of different impression techniques for parallel and divergent implants

Evaluation of the Effect of Two Types of Autopolymerizing Acrylic Resin Splints on Dimensional Accuracy in Open Tray Impression Technique

Comparison of the accuracy of fixture-level impression making after splinting prosthetic components

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