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Vult von Steyern, PerORCID iD iconorcid.org/0000-0001-6593-0151
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Publications (10 of 57) Show all publications
Stavropoulos, A., Bertl, K., Isidor, F. & Vult von Steyern, P. (2023). Implantoplasty and the risk of fracture of narrow implants with advanced bone loss: A laboratory study. Clinical Oral Implants Research, 34(10), 1038-1046
Open this publication in new window or tab >>Implantoplasty and the risk of fracture of narrow implants with advanced bone loss: A laboratory study
2023 (English)In: Clinical Oral Implants Research, ISSN 0905-7161, E-ISSN 1600-0501, Vol. 34, no 10, p. 1038-1046Article in journal (Refereed) Published
Abstract [en]

Objectives: To assess the impact of implantoplasty (IP) on maximum implant failure strength of narrow diameter implants of different type/design and material, with simulated advanced bone loss.

Materials and Methods: Narrow, parallel-walled implants (3.3 mm in diameter x 10 mm long) with an internal connection of different type/design [bone level (BL), tissue level (TL)] and material [Titanium grade IV (Ti), Titanium-Zirconium alloy (TiZr)] from one specific manufacturer were used. Half of the implants were subjected to IP in their coronal 5 mm; the remaining were used as controls (seven implants per group). Dynamic loading prior to maximum load strength testing was included.

Results: During dynamic loading, the fracture rate of BL implants was low and independent of IP, while that of TL implants increased significantly with IP compared with controls (p = .001). Maximum implant failure strength reduction (in %) due to IP, was 1.3%-25.4%; TiZr BL implants were least affected. Implants subjected to IP compared to those without IP as well as TL implants compared to BL implants showed a significantly lower maximum implant failure strength (p < .002); implant material was not significant (p = .845).

Conclusions: Based on data from implants of one specific manufacturer, IP has a significant negative impact on the fracture strength of narrow implants suffering from advanced peri-implantitis. TL implants have been more severely affected compared to BL implants and presented an increased risk for failure during normal chewing forces. In addition, this negative impact of IP on TL implants was independent of the implant material (i.e., Ti or TiZr).

Clinical Relevance: Narrow single TL implants with advanced horizontal bone loss (e.g., 5 mm), when subjected to IP, appear to have an increased fracture risk during normal function.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
dental implant, dynamic loading, implant failure, Implantoplasty, mechanical complication, narrow diameter
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-61874 (URN)10.1111/clr.14132 (DOI)001031888400001 ()37464268 (PubMedID)2-s2.0-85165314479 (Scopus ID)
Available from: 2023-08-16 Created: 2023-08-16 Last updated: 2023-10-18Bibliographically approved
Heidari, N., Amawi, R., Seweryniak, P., Bakitian, F. & Vult von Steyern, P. (2022). Fracture Resistance and Fracture Behaviour of Monolithic Multi-Layered Translucent Zirconia Fixed Dental Prostheses with Different Placing Strategies of Connector: An in vitro Study. Clinical, Cosmetic and Investigational Dentistry, 14, 61-69
Open this publication in new window or tab >>Fracture Resistance and Fracture Behaviour of Monolithic Multi-Layered Translucent Zirconia Fixed Dental Prostheses with Different Placing Strategies of Connector: An in vitro Study
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2022 (English)In: Clinical, Cosmetic and Investigational Dentistry, E-ISSN 1179-1357, Vol. 14, p. 61-69Article in journal (Refereed) Published
Abstract [en]

Purpose: To evaluate the effect of different placing strategies performed in the connector area on fracture resistance and fracture behaviour of monolithic multi-layered translucent zirconia fixed dental prostheses (FDPs).

Materials and Methods: Thirty 3-unit monolithic FDPs were produced and divided into three groups (n = 10) based on the different strategies for placing the connector area of FDPs in multi-layered zirconia blank with varying contents of yttria ranging from 4 to 5 mol%. The groups were as follows: FDPs with connectors placed in dentin layer with 4 mol% yttria content, FDPs with connectors placed in gradient layer, and FDPs with connectors placed in translucent layer with 5 mol% yttria content. A final group (n = 10) of conventional monolithic zirconia with a monolayer of yttria content (4 mol%) has been used as a control group. The specimens were artificially aged using thermocycling and pre-loading procedures and subsequently loaded to fracture using a universal testing machine. Fracture loads and fracture behaviour were analyzed using one-way ANOVA and Fisher's exact tests and statistically evaluated (p ≤ 0.05).

Results: There were no significant differences in fracture loads among the groups based on the placing strategies of the connector area of the FDPs in the multi-layered translucent zirconia blank (p > 0.05). There was no significant difference in fracture loads between monolithic multi-layered translucent zirconia and conventional monolithic translucent zirconia materials (p > 0.05). Fracture behaviour of FDPs with connector area placed in translucent layer differed significantly compared to FDPs with connector area placed in dentin layer and FDPs in control group (p = 0.004).

Conclusion: The placing strategies of the connector used in the computer aided design and manufacturing procedures do not considerably affect fracture resistance of monolithic FDPs made of multi-layered translucent zirconia. Monolithic FDPs made of multi-layered translucent zirconia show comparable strength to FDPs made of conventional translucent zirconia, but with different fracture behaviour.

Place, publisher, year, edition, pages
Dove Press, 2022
Keywords
Y-TZP, all-ceramic restorations, computer-aided design\manufacturing, fracture load, multi-layered zirconia
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-51016 (URN)10.2147/CCIDE.S344941 (DOI)000778295900001 ()35345450 (PubMedID)2-s2.0-85127450093 (Scopus ID)
Available from: 2022-04-08 Created: 2022-04-08 Last updated: 2024-02-05Bibliographically approved
Vult von Steyern, P., Bruzell, E., Vos, L., Andersen, F. S. & Ruud, A. (2022). Sintering temperature accuracy and its effect on translucent yttria-stabilized zirconia: Flexural strength, crystal structure, tetragonality and light transmission.. Dental Materials, 38(7), 1099-1107, Article ID S0109-5641(22)00114-2.
Open this publication in new window or tab >>Sintering temperature accuracy and its effect on translucent yttria-stabilized zirconia: Flexural strength, crystal structure, tetragonality and light transmission.
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2022 (English)In: Dental Materials, ISSN 0109-5641, E-ISSN 1879-0097, Vol. 38, no 7, p. 1099-1107, article id S0109-5641(22)00114-2Article in journal (Refereed) Published
Abstract [en]

OBJECTIVES: A crucial step in the preparation of yttria-stabilized zirconia materials (YSZ) is the final sintering step. Sintering parameters affect phase composition, grain growth and porosity of the material which, in turn, influence both mechanical and optical properties. Discrepancies of + /- 5% are common between actual and displayed firing temperatures depending on sintering furnace brand and condition. The aim of this study was therefore to investigate how such sintering temperature deviations in dental furnaces compared to the recommended firing protocols affected certain material properties of different yttria-stabilized zirconia materials.

METHODS: Disc-shaped specimens were made from four different translucent and high translucent YSZ-powders and analysed regarding crystal structure; unit cell volume for the c, t, and t' -phases along with the tetragonality for the t and t' phases. Biaxial flexure strength and the spectral transmittance through the ceramic specimens were also measured.

RESULTS: Deviations of 5% from the sintering temperature recommended for YSZ materials with different yttria content influenced material properties such as light transmittance, flexural strength, crystal phase fractions, tetragonality, and grain growth. Too low temperature resulted in decreased strength for some of the translucent zirconia materials, while others where less affected. Light transmittance varied depending on several factors such as grain size, crystal phase fractions and binder content in the start material prior to pre-sintering.

SIGNIFICANCE: The use of high quality, wellcalibrated furnaces is crucial when sintering YSZ materials to avoid unwanted material changes.

CONCLUSIONS: Deviations of 5% from the sintering temperature recommended for YSZ materials with different yttria content influence material properties such as light transmittance, flexural strength, crystal phase fractions, tetragonality, and grain growth. Too low temperature results in decreased strength for some translucent zirconia materials, while others are less affected. Light transmittance varies depending on several factors such as grain size, crystal phase fractions and binder content in the start material prior to pre-sintering. Consequently, the use of high quality, well-calibrated furnaces is crucial when sintering YSZ materials to avoid unwanted material changes.

Place, publisher, year, edition, pages
Elsevier, 2022
Keywords
Biaxial flexure strength, Dental furnace, Grain size, Light transmittance, Sintering, Tetragonality, Translucent, Y-TZP, YSZ, Zirconia, Zirconium-dioxide
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-52210 (URN)10.1016/j.dental.2022.04.023 (DOI)000862721700002 ()35570007 (PubMedID)2-s2.0-85130365362 (Scopus ID)
Available from: 2022-06-08 Created: 2022-06-08 Last updated: 2024-02-05Bibliographically approved
Bertl, K., Isidor, F., Vult von Steyern, P. & Stavropoulos, A. (2021). Does implantoplasty affect the failure strength of narrow and regular diameter implants?: A laboratory study. Clinical Oral Investigations, 25, 2203-2211
Open this publication in new window or tab >>Does implantoplasty affect the failure strength of narrow and regular diameter implants?: A laboratory study
2021 (English)In: Clinical Oral Investigations, ISSN 1432-6981, E-ISSN 1436-3771, Vol. 25, p. 2203-2211Article in journal (Refereed) Published
Abstract [en]

Objective

To assess whether the impact of implantoplasty (IP) on the maximum implant failure strength depends on implant type/design, diameter, or material.

Methods

Fourteen implants each of different type/design [bone (BL) and tissue level (TL)], diameter [narrow (3.3 mm) and regular (4.1 mm)], and material [titanium grade IV (Ti) and titanium-zirconium alloy (TiZr)] of one company were used. Half of the implants were subjected to IP in a computerized torn. All implants were subjected to dynamic loading prior to loading until failure to simulate regular mastication. Multiple linear regression analyses were performed with maximum implant failure strength as dependent variable and IP, implant type/design, diameter, and material as predictors.

Results

Implants subjected to IP and TL implants showed statistically significant reduced implant failure strength irrespective of the diameter compared with implants without IP and BL implants, respectively. Implant material had a significant impact for TL implants and for regular diameter implants, with TiZr being stronger than Ti. During dynamic loading, 1 narrow Ti TL implant without IP, 4 narrow Ti TL implants subjected to IP, and 1 narrow TiZr TL implant subjected to IP were fractured.

Conclusion

IP significantly reduced the maximum implant failure strength, irrespective implant type/design, diameter, or mate- rial, but the maximum implant failure strength of regular diameter implants and of narrow BL implants remained high.

Clinical Relevance

IP seems to have no clinically relevant impact on the majority of cases, except from those of single narrow Ti TL implants, which may have an increased risk for mechanical complications. This should be considered for peri-implantitis treatment planning (e.g., communication of potential complications to the patient), but also in the planning of implant installation (e.g., choosing TiZr instead of Ti for narrow implants).

Place, publisher, year, edition, pages
Springer, 2021
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-18194 (URN)10.1007/s00784-020-03534-8 (DOI)000566663400001 ()32893312 (PubMedID)2-s2.0-85090778649 (Scopus ID)
Available from: 2020-09-08 Created: 2020-09-08 Last updated: 2024-02-05Bibliographically approved
Gardell, E., Larsson, C. & Vult von Steyern, P. (2021). Translucent Zirconium Dioxide and Lithium Disilicate: A 3-Year Follow-up of a Prospective, Practice-Based Randomized Controlled Trial on Posterior Monolithic Crowns. International Journal of Prosthodontics, 34(2), 163-+
Open this publication in new window or tab >>Translucent Zirconium Dioxide and Lithium Disilicate: A 3-Year Follow-up of a Prospective, Practice-Based Randomized Controlled Trial on Posterior Monolithic Crowns
2021 (English)In: International Journal of Prosthodontics, ISSN 0893-2174, E-ISSN 1139-9791, Vol. 34, no 2, p. 163-+Article in journal (Refereed) Published
Abstract [en]

Purpose: To systematically evaluate and compare the clinical performance of lithium disilicate (LDS)and zirconium dioxide (ZrO2)-based ceramic monolithic crowns in the posterior dentition. Materials and Methods: Treatment was administered by two experienced general dental practitioners in two public dental health care clinics. Forty-four patients received 60 crowns randomized to be either LDS or ZrO2 and cemented with resin cement. Evaluations were performed after 3 years using California Dental Association criteria. Results: The mean follow-up time was 40 months (range: 31 to 50). No crown fractured during the observation time, and no chip-off fractures occurred. The success rate for ZrO2 was 80%, and the survival rate was 93.3%. For LDS, the success rate was 89.7%, and the survival rate was 100%. Survival after 3 years for all crowns together was 96.6%, and success was 84.7%. There was no significant difference between the two materials. Conclusion: Crowns made of monolithic translucent ZrO2 and LDS show equal and promising clinical results from a short-term perspective. There seems to be a difference between how patients and professionals rate crowns concerning esthetics (color and shape), with patients rating the restorations more favorably.

Place, publisher, year, edition, pages
Quintessence, 2021
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-42377 (URN)10.11607/ijp.6795 (DOI)000642012500004 ()33882563 (PubMedID)2-s2.0-85104689633 (Scopus ID)
Available from: 2021-05-27 Created: 2021-05-27 Last updated: 2024-02-05Bibliographically approved
Rutkunas, V., Larsson, C., Vult von Steyern, P., Mangano, F. & Gedrimiene, A. (2020). Clinical and laboratory passive fit assessment of implant-supported zirconia restorations fabricated using conventional and digital workflow. Clinical Implant Dentistry and Related Research, 22(2), 237-245
Open this publication in new window or tab >>Clinical and laboratory passive fit assessment of implant-supported zirconia restorations fabricated using conventional and digital workflow
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2020 (English)In: Clinical Implant Dentistry and Related Research, ISSN 1523-0899, E-ISSN 1708-8208, Vol. 22, no 2, p. 237-245Article in journal (Refereed) Published
Abstract [en]

Background Long-term success of implant-supported restorations can be affected by the accuracy of the prosthodontic workflow which may differ between conventional and digital techniques. Purpose The purpose was to compare the fit of two-implant-supported restorations, fabricated using conventional and digital workflows and to assess the influence of distance and angulation between the implants on the passive fit of the prosthesis. The SR test was selected to evaluate the fit of two-implant-supported zirconia restorations. Materials and Methods Forty-eight zirconia two-implant-supported restorations were fabricated according to conventional (group C, n = 24) and digital (group D, n = 24) workflows. The SR parameter was calculated as a difference of rotation angles of each screw in passive and nonpassive situations. SR values between groups C and D were compared by performing measurements intraorally, on master and control casts. Results SR intraorally in group C (16.25 +/- 15.52 degrees) was higher than it was in group D (13.85 +/- 10.78 degrees), but the difference was not statistically significant (P = .557). While measuring SR on the master cast, group C SR (6.04 +/- 7.43 degrees) had lower values than group D (13.12 +/- 13.86 degrees) (P = .0039). No statistically significant correlations were found between SR measurements and inter-implant distance or angulation. Restorations with inter-implant angle higher than 10 degrees differed significantly from those with less than 10 degrees angulation. Conclusions Digital restorations had a better fit on the control cast, which was used as a reference in this study. Angulation of more than 10 degrees between the implants could negatively affect the passive fit of the digitally fabricated restorations intraorally.

Place, publisher, year, edition, pages
John Wiley & Sons, 2020
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-13808 (URN)10.1111/cid.12885 (DOI)000511170900001 ()32026603 (PubMedID)2-s2.0-85079060992 (Scopus ID)
Available from: 2020-03-18 Created: 2020-03-18 Last updated: 2024-02-05Bibliographically approved
Bakitian, F., Papia, E., Larsson, C. & Vult von Steyern, P. (2020). Evaluation of Stress Distribution in Tooth-Supported Fixed Dental Prostheses Made of Translucent Zirconia with Variations in Framework Designs: A Three-Dimensional Finite Element Analysis. Journal of Prosthodontics, 29(4), 315-322
Open this publication in new window or tab >>Evaluation of Stress Distribution in Tooth-Supported Fixed Dental Prostheses Made of Translucent Zirconia with Variations in Framework Designs: A Three-Dimensional Finite Element Analysis
2020 (English)In: Journal of Prosthodontics, ISSN 1059-941X, E-ISSN 1532-849X, Vol. 29, no 4, p. 315-322Article in journal (Refereed) Published
Abstract [en]

Purpose To evaluate the influence of the framework designs on the stress distribution within tooth-supported partially veneered fixed dental prostheses (FDPs) made of translucent zirconia under simulated loads using a three-dimensional finite element analysis (3D-FEA). Material and Methods For a linear 3D-FEA, simplified 3D solid models of prepared abutment teeth (first premolar and first molar) with different 3-unit FDPs were created. The models with different FDP designs-monolithic zirconia (control); semi-monolithic zirconia with 0.3 mm veneer thickness (SM0.3); semi-monolithic zirconia with 0.5 mm veneer thickness (SM0.5); semi-monolithic zirconia with 0.5 mm veneer thickness supported with cap design (SMC), and semi-monolithic zirconia with 0.5 mm veneer thickness supported with wave design (SMW)-were analyzed using 3D-FEA. The elastic properties of the components (bone, dentine, cement, translucent zirconia, and veneering porcelain) were obtained from the published data for FEA. Simulated static loading forces (300 N) were applied at 10 degrees oblique direction over six points in the occlusal surfaces of the FDPs. Maximum principal stress, shear stress, and safety factor were calculated and analyzed among the different models. Results Semi-monolithic with cap design showed the smallest maximum principal stress levels in the veneering porcelain compared to all other models (SM0.3, SM0.5, SMW). The SM0.3 had lower maximum principal stress levels in the veneering porcelain compared to SM0.5. Regarding stresses in the zirconia framework, all models had comparable results in maximum principal tensile stresses, except SMW had a lower value. Maximum principal stress levels were located in the veneer component of SM0.3, SM0.5, and SMW, whereas, such levels were observed in the cervical areas of the zirconia frameworks of SMC and control. The SM0.3 had the highest maximum shear stress levels at the zirconia-veneer interface, while SMW had the lowest shear values. The 3D-FEA models with different FDP designs showed different minimum safety factor levels. Conclusions Framework and veneer designs play a significant role in the stress distribution of the partially veneered zirconia FDPs under loading. The FDPs with zirconia frameworks with cap design minimize the maximum principal tensile stress in the veneering porcelain. The FDPs with 0.3-mm-veneering porcelain show low maximum principal tensile stress in the veneering porcelain, but highest maximum shear stress at the zirconia-veneer interface. The FDPs with wave design of zirconia frameworks minimize the maximum shear stress considerably.

Place, publisher, year, edition, pages
John Wiley & Sons, 2020
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-13810 (URN)10.1111/jopr.13146 (DOI)000510974000001 ()31971307 (PubMedID)2-s2.0-85078918989 (Scopus ID)
Available from: 2020-03-17 Created: 2020-03-17 Last updated: 2024-02-05Bibliographically approved
Löfroth, M., Ghasemimehr, M., Falk, A. & Vult von Steyern, P. (2019). Bisphenol A in dental materials: existence, leakage and biological effects. Heliyon, 5(5), Article ID e01711.
Open this publication in new window or tab >>Bisphenol A in dental materials: existence, leakage and biological effects
2019 (English)In: Heliyon, E-ISSN 2405-8440, Vol. 5, no 5, article id e01711Article, review/survey (Refereed) Published
Abstract [en]

Objective: Recently, questions have been raised concerning the potential endocrine disrupting effects of bisphenol A (BPA). This substance is a constituent in many different products which we frequently come into contact with, such as food containers and receipts. Resin-based dental filling materials are another source of exposure, although according to previous studies the amount and potential risks are not clear. Thus, the aims of the present study were (1) to identify if direct dental filling materials are liable to leak BPA and (2) to investigate if this leakage could lead to any adverse effects on health. Materials and methods: A literature search was made with PubMed as the primary source, subsequently complemented with reference tracking. Results: A total of 26 articles were included, 24 of which were used for the first aim (leakage) and 2 for the second aim (health risks). The majority of studies, including all in vivo studies, showed leakage of BPA from dental materials in various amounts and during different time intervals. The findings showed a contradiction in results regarding the connection between dental materials and adverse health effects. Conclusions: There is leakage of BPA from some dental materials, but critical levels are not evident. Bis-DMA contents might convert to BPA in the oral cavity. There is a contradiction between in vitro and in vivo studies concerning BPA leakage and finally, there is a lack of studies investigating the association between BPA exposure and its adverse effects on human health.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Public health, Endocrinology, Materials chemistry, Dentistry
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Identifiers
urn:nbn:se:mau:diva-39203 (URN)10.1016/j.heliyon.2019.e01711 (DOI)000473561400141 ()31193754 (PubMedID)2-s2.0-85066259619 (Scopus ID)
Available from: 2021-01-15 Created: 2021-01-15 Last updated: 2024-02-05Bibliographically approved
Bakitian, F., Seweryniak, P., Papia, E., Larsson, C. & Vult von Steyern, P. (2019). Load-Bearing Capacity of Monolithic Zirconia Fixed Dental Prostheses Fabricated with Different Connector Designs and Embrasure Shaping Methods (ed.). Journal of Prosthodontics, 28(1), 64-70
Open this publication in new window or tab >>Load-Bearing Capacity of Monolithic Zirconia Fixed Dental Prostheses Fabricated with Different Connector Designs and Embrasure Shaping Methods
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2019 (English)In: Journal of Prosthodontics, ISSN 1059-941X, E-ISSN 1532-849X, Vol. 28, no 1, p. 64-70Article in journal (Refereed)
Abstract [en]

Aim> To investigate the load-bearing capacity and failure mode of monolithic zirconia fixed dental prostheses (FDPs) fabricated with different connector designs and embrasure shaping methods. Materials and methods> Seventy 4-unit zirconia FDPs (with 2 premolar pontics) were fabricated and divided into 7 groups (n = 10) according to the different connector designs gained by using different embrasure shaping methods. The groups were as follows: monolithic FDPs fabricated with sharp embrasures, monolithic FDPs fabricated with blunt embrasures, monolithic FDPs fabricated with blunt embrasures and no occlusal embrasures, 2 groups of monolithic FDPs fabricated with blunt embrasures and interproximal separations made with diamond discs at the soft stage and at the fully sintered stage, and monolithic FDPs fabricated with blunt embrasures and interproximal separation accentuated by localized porcelain build-up. A final group of fully veneered traditional zirconia FDPs to be used as a control group were fabricated with default milling settings. The FDPs were artificially aged and loaded to fracture. Load to fracture and failure modes were analyzed by 1-way ANOVA, Tukey post-hoc test, and Fisher exact test (α = 0.05). Results> The FDPs fabricated with interproximal porcelain separation showed significantly the highest load to fracture (1038 N ± 82) of all groups (p < 0.001), with no significant difference compared to the FDPs with no occlusal embrasures (934 N ± 175) (p ˃ 0.29). The FDPs fabricated with blunt embrasures showed significantly higher load to fracture (873 N ± 115) compared to the FDPs in control group (689 N ± 75) and the FDPs with sharp embrasures (417 N ± 87) (p < 0.001). There were no significant differences between the FDPs with sharp embrasures (417 N ± 87) and the FDPs with interproximal discs separations (467 N ± 94; p ˃ 0.23). Failure mode of the FDPs fabricated with sharp embrasures and interproximal discs separations differed significantly compared to the FDPs in the other groups (p < 0.001). Conclusions> Sharp embrasures and interproximal separations made with diamond discs significantly decrease the load-bearing capacity of monolithic zirconia FDPs compared to FDPs made with blunt embrasures. Blunt embrasures in combination with localized porcelain build-up produce FDPs with high load-bearing capacity in relation to loads that might be expected under clinical use. This article is protected by copyright. All rights reserved.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
All-ceramic restorations, Y-TZP, connector design, translucent zirconia, zirconia
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-15430 (URN)10.1111/jopr.13002 (DOI)000456211000019 ()30478870 (PubMedID)2-s2.0-85057725994 (Scopus ID)26981 (Local ID)26981 (Archive number)26981 (OAI)
Available from: 2020-03-30 Created: 2020-03-30 Last updated: 2024-02-05Bibliographically approved
Lindström, M. J., Ahmad, M., Jimbo, R., Ameri, A., Vult von Steyern, P. & Becktor, J. P. (2019). Volumetric measurement of dentoalveolar defects by means of intraoral 3D scanner and gravimetric model (ed.). Odontology: official journal of The Society of the Nippon Dental University, 103(3), 353-359
Open this publication in new window or tab >>Volumetric measurement of dentoalveolar defects by means of intraoral 3D scanner and gravimetric model
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2019 (English)In: Odontology: official journal of The Society of the Nippon Dental University, ISSN 1618-1247, E-ISSN 1618-1255, Vol. 103, no 3, p. 353-359Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to evaluate the accuracy in volumetric measurements obtained on an experimental model using an intraoral scanner and a gravimetric method. Three identical partial dentate maxillary acrylic models with three fabricated alveolar defects, in anterior and posterior regions, were scanned using an intraoral scanner (20 scans/defects). The defects differed in terms of size and distance of neighbouring teeth. As references, replicas of each defect were created using a dimensional stable silicone impression material. After measuring the mass of each replica, the volume was calculated by dividing the mass of each replica by the density of the impression material. The defects had a volume, according to the gravimetric method, ranging from 40.5 to 143.7 mm. The scans were imported to metrology software for analyses. Accuracy was determined in terms of trueness and precision. The mean trueness for all defect types was 0.168 mm (SD 0.691, range 2.82). There was no statistical significant difference between the mean trueness for all defects measured (p = 0.910). The mean precision for all defect types was 0.147 mm (SD 0.524, range 2.86). There were no statistical significant differences between the dental models in regard to mean precision (p = 0.401), however, there were statistical significant differences between defects in position 1 and 2 (p = 0.002) and 1 and 3 (p = 0.001). Based on the findings of this study, the intraoral scanner utilized in the current study presented an acceptable level of accuracy when measuring volume of defects.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Intraoral scanning, Surgical techniques, Tissue alterations, Volumetric measurement, Wound healing
National Category
Dentistry
Identifiers
urn:nbn:se:mau:diva-15492 (URN)10.1007/s10266-018-00410-6 (DOI)000471055600010 ()30617638 (PubMedID)2-s2.0-85059638061 (Scopus ID)27875 (Local ID)27875 (Archive number)27875 (OAI)
Available from: 2020-03-30 Created: 2020-03-30 Last updated: 2024-02-05Bibliographically approved
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