Randomized controlled clinical trial on the three-dimensional accuracy of fast-set impression materials

Rudolph, Heike; Quaas, Sebastian; Haim, Manuela; Preißler, Jörg; Walter, Michael; Koch, Rainer; Luthardt, Ralph G.

doi:10.1007/s00784-012-0823-0

Cited by 15 publications

(11 citation statements)

References 24 publications

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“…Furthermore, it should be taken into account that some wear values were within the range of measurement accuracy of 10 lm according to Mehl et al (32). In addition, it should be mentioned that the detail reproduction of vinylpolysiloxane and dental stone type IV generally do not exhibit accuracy in the region of 10 lm; it is less precise under clinical conditions (45,46). For the above-mentioned reasons, the measured absolute wear values must be interpreted with caution, and the focus should be the comparisons of the differences in wear.…”

Section: Discussionmentioning

confidence: 99%

Enamel wear caused by monolithic zirconia crowns after 6 months of clinical use

Stober

Rammelsberg

Schmitter

2014

J of Oral Rehabilitation

147

105

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The purpose of this study was to evaluate enamel wear caused by monolithic zirconia crowns and to compare this with enamel wear caused by contralateral natural antagonists. Twenty monolithic zirconia crowns were placed in 20 patients requiring full molar crowns. For measurement of wear, impressions of both jaws were made at baseline after crown cementation and at 6-month follow-up. Mean and maximum wear of the occlusal contact areas of the crowns, of their natural antagonists and of the two contralateral natural antagonists were measured by the use of plaster replicas and 3D laser scanning methods. Wear differences were investigated by the use of two-sided paired Student's t-tests and by linear regression analysis. Mean vertical loss (maximum vertical loss in parentheses) was 10 (43) μm for the zirconia crowns, 33 (112) μm for the opposing enamel, 10 (58) μm for the contralateral teeth and 10 (46) μm for the contralateral antagonists. Both mean and maximum enamel wear were significantly different between the antagonists of the zirconia crowns and the contralateral antagonists. Gender and activity of the masseter muscle at night (bruxism) were identified as possible confounders which significantly affected wear. Under clinical conditions, monolithic zirconia crowns seem to be associated with more wear of opposed enamel than are natural teeth. With regard to wear behaviour, clinical application of monolithic zirconia crowns is justifiable because the amount of antagonistic enamel wear after 6 months is comparable with, or even lower than, that caused by other ceramic materials in previous studies.

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Section: Discussionmentioning

confidence: 99%

Enamel wear caused by monolithic zirconia crowns after 6 months of clinical use

Stober

Rammelsberg

Schmitter

2014

J of Oral Rehabilitation

147

105

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“…Along with the diverse efforts made to enhance the properties of impression materials, digital technologies have started to pervade deeply into the field of prosthodontics . As a result, computer‐aided design/computer‐aided manufacturing (CAD/CAM) technology has become indispensable for the fabrication of definitive restorations .…”

mentioning

confidence: 99%

Accuracy of Three Digitization Methods for the Dental Arch with Various Tooth Preparation Designs: An In Vitro Study

Lee²,

Park

et al. 2018

Journal of Prosthodontics

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Purpose To evaluate the accuracy of three digitization methods for the maxillary dental arch. Materials and Methods A maxillary typodont with various tooth preparation designs was used as the reference model. The scanned data were classified into direct scanning (DS), cast scanning (CS), and impression scanning (IS) groups according to the techniques applied for digitization (n = 10/group). An intraoral scanner was used for the DS group. Impressions obtained with polyether impression material were scanned with a tabletop scanner for the IS group. For the CS group, the definitive casts fabricated from the obtained impressions were scanned with the same tabletop scanner. The accuracy (trueness and precision) of the produced virtual dental casts was evaluated with specialized software. The full‐arch and individual abutment deviations were measured with regard to root mean square error (RMSE) values. Data were analyzed with statistical software with an α0.33em=0.33em0.05. Results The RMSE values for both trueness and precision were lowest in the IS group, followed by the CS and DS groups, with statistically significant differences among the groups (p < 0.05). The trueness of individual abutments was significantly higher in the IS group than in the DS group. In addition, the trueness of individual abutments was affected by the location of the abutments in the DS group, whereas it did not differ between individual abutments in the CS and IS groups. Conclusions These findings suggest that the IS method is an accurate digitization technique for the creation of a virtual dental cast.

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“…The combination of these results is one of the major advantages of this experimental procedure. Based on previous studies, 3D mean deviations of ±0.02 mm for in vitro conditions and ±0.04 to 0.05 mm in clinical sites are to be expected for high-precision final impression materials and techniques 27,47,53,58) . The qualitative analysis (Figs.…”

Section: Discussionmentioning

confidence: 89%

“…Also, there is no need for a shape restriction when freeform surfaces can be analyzed just as well as clearly geometrically defined shapes such as cones or cylinders. The assessment of many different experimental set-ups close to the dental clinical setting hence becomes possible [2][3][4]8,37,[45][46][47]49,57,58) . Based on the experience from former in vitro and in vivo studies 3,9,[45][46][47][48]53,57) , maximum positive and negative deviations, which are also calculated by the CAD software, were not further evaluated.…”

Section: Discussionmentioning

confidence: 99%

“…The most accurate elastomeric impression materials available are polyvinyl siloxanes, polyethers, and vinyl siloxanethers 15,17,44) . For single teeth or small segments (up to four teeth), a clinically achievable precision of up to ±40-50 µm can be deduced for the mean deviations from clinical trials [45][46][47] . In vitro evaluations result in higher precision and mean dimensional changes below ±20 µm 27,48) .…”

Section: Introductionmentioning

confidence: 99%

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Performance of dental impression materials: Benchmarking of materials and techniques by three-dimensional analysis

et al. 2015

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Among other factors, the precision of dental impressions is an important and determining factor for the fit of dental restorations. The aim of this study was to examine the three-dimensional (3D) precision of gypsum dies made using a range of impression techniques and materials. Ten impressions of a steel canine were fabricated for each of the 24 material-method-combinations and poured with type 4 die stone. The dies were optically digitized, aligned to the CAD model of the steel canine, and 3D differences were calculated. The results were statistically analyzed using one-way analysis of variance. Depending on material and impression technique, the mean values had a range between +10.9/−10.0 µm (SD 2.8/2.3) and +16.5/−23.5 µm (SD 11.8/18.8). Qualitative analysis using colorcoded graphs showed a characteristic location of deviations for different impression techniques. Three-dimensional analysis provided a comprehensive picture of the achievable precision. Processing aspects and impression technique were of significant influence.

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Randomized controlled clinical trial on the three-dimensional accuracy of fast-set impression materials

Abstract: Best accuracy was achieved with machine-mixed heavy-body/light-body polyether. Both materials examined met the clinical requirements regarding precision when the teeth were completely syringed with light material.

Cited by 15 publications

References 24 publications

Enamel wear caused by monolithic zirconia crowns after 6 months of clinical use

Enamel wear caused by monolithic zirconia crowns after 6 months of clinical use

Accuracy of Three Digitization Methods for the Dental Arch with Various Tooth Preparation Designs: An In Vitro Study

Performance of dental impression materials: Benchmarking of materials and techniques by three-dimensional analysis

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