Marginal and internal fit of three-unit zirconia fixed dental prostheses: Effects of prosthesis design, cement space, and zirconia type

Suzuki, Shigehiko; Katsuta, Yasuhiro; Ueda, Ken–ichi; Watanabe, Fumio

doi:10.1016/j.jpor.2019.12.005

Cited by 24 publications

(18 citation statements)

References 26 publications

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“…Therefore, this method was used in this study. The results of our study showed that the cement space has a significant effect on marginal discrepancy, and compatible with Tuncer study [28] also is supported with Shohei Suzuki study that shows by increasing cement space, marginal discrepancy is decreased [29]. In contrast with aforementioned articles, Rinet Dauti study shows cement space has no significant effect on marginal discrepancy [30].…”

Section: Discussionsupporting

confidence: 89%

The affects of cement space thickness and material type with application of micro-CT scanner on marginal discrepancy of restoration

Mosharraf

Amir

Naziri

et al. 2020

BDS

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Objective: Studies demonstrated that as one of the newly developed restorative materials, monolithic zirconia resolved several issues of zirconia restoration. Therefore, marginal accuracy and internal fit are necessary for clinical success and quality of restorations, and cement space may influence the marginal fit. Thus, the present research aimed to investigate the effects of the cement thickness and kind of restoration on the marginal discrepancy. Material and methods: In this study, 20 maxillary left first molars, prepared by DRSK Co., were used to fabricate a full crown. Two types of material included monolithic zirconia (Zolid) and Sintron were used to make a full crown. Samples from each group were scanned by dental laboratory 3D scanner and designed and processed using CAD-CAM. The samples were divided into four groups of five with 30- and 50- µm cement spaces. In order to assess the vertical marginal discrepancy, the crowns were fitted on their respective teeth without using any mediator and examined by a micro-CT scanner. Data were analyzed by SPSS software. Results: It has been found that marginal discrepancy in Sintron is higher than the discrepancy of monolithic zirconia. In fact, monolithic zirconia with 50-micron cement space exhibited the least marginal discrepancy and the cement space in Sintron did not significantly influence the marginal discrepancy. Conclusion: It has been concluded that the material kinds and cement space influence the restoration marginal discrepancy constructed by digital workflow. KEYWORDSDental cements; Dental marginal adaptation; X-Raymicrotomography.

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Section: Discussionsupporting

confidence: 89%

The affects of cement space thickness and material type with application of micro-CT scanner on marginal discrepancy of restoration

Mosharraf

Amir

Naziri

et al. 2020

BDS

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“…This result is in accordance with other studies. 46 47 In line with this information, the cement gap value was set as 50 µm to compare the marginal and internal fit of the 3-unit zirconia FPD restorations produced in this study.…”

Section: Discussionmentioning

confidence: 99%

In-vitro evaluation of marginal and internal fit of 3-unit monolithic zirconia restorations fabricated using digital scanning technologies

Özal¹,

Ulusoy²

2021

J Adv Prosthodont

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PURPOSE This study aimed to compare the marginal and internal fit of 3-unit monolithic zirconia restorations that were designed by using the data obtained with the aid of intraoral and laboratory scanners. MATERIALS AND METHODS For the fabrication of 3-unit monolithic zirconia restorations using impressions taken from the maxillary master cast, plaster cast was created and scanned in laboratory scanners (InEos X5 and D900L). The main cast was also scanned with different intraoral scanners (Omnicam [OMNI], Primescan [PS], Trios 3 [T3], Trios 4 [T4]) (n = 12 per group). Zirconia fixed partial dentures were virtually designed, produced from presintered block, and subsequently sintered. Marginal and internal discrepancy values (in µm) were measured by using silicone replica method under stereomicroscope. Data were statistically analyzed by using 1-way ANOVA and Kruskal Wallis tests ( P <.05). RESULTS In terms of marginal adaptation, the measurements on the canine tooth indicated better performance with intraoral scanners than those in laboratory scanners, but there was no difference among intraoral scanners ( P <.05). In the premolar tooth, PS had the lowest marginal (86.9 ± 19.2 µm) and axial (92.4 ± 14.8 µm), and T4 had the lowest axio-occlusal (89.4 ± 15.6 µm) and occlusal (89.1 ± 13.9 µm) discrepancy value. In both canine and premolar teeth, the D900L was found to be the most marginally and internally inconsistent scanner. CONCLUSION Within the limits of the study, marginal and internal discrepancy values were generally lower in intraoral scanners than in laboratory scanners. Marginal discrepancy values of scanners were clinically acceptable (< 120 µm), except D900L.

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“…These patterns were highlighted in primary maxillary first molars and might have a detrimental effect on the dental prostheses. Suzuki et al 24 reported that a large discrepancy in the occlusal area could cause delamination and fracture of the porcelain veneered on zirconia frameworks. Moreover, these patterns indicate that there will be more luting cement on the occlusal surfaces.…”

Section: Discussionmentioning

confidence: 99%

Three‐dimensional evaluation of tooth preparation forms in paediatric zirconia crowns: An in vitro study

Chae

Lee

Hyun

et al. 2021

Int J Paed Dentistry

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With growing aesthetic desires among paediatric patients and their guardians, the availability of prefabricated zirconia crowns (PZCs) has helped dental practitioners meet the aesthetic needs of the patient. PZCs have established their excellence in aesthetics and biocompatibility. 1,2 Previous clinical studies have shown that PZCs have reliable long-term retention. 3,4 PZCs are, however, highly stiff and require a passive fit for complete seating. 5 Unlike stainless steel crowns (SSCs), PZCs cannot be contoured, crimped, or trimmed to achieve a tight marginal seal and mechanical retention. 3,6 Thus, these properties can create challenges in the adaptation of PZCs and necessitate more aggressive tooth preparation. 7,8 Due to the differences in the properties between SSCs and PZCs, different guidelines are adopted to obtain optimal crown adaptation. As retention of PZCs mainly

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Marginal and internal fit of three-unit zirconia fixed dental prostheses: Effects of prosthesis design, cement space, and zirconia type

Cited by 24 publications

References 26 publications

The affects of cement space thickness and material type with application of micro-CT scanner on marginal discrepancy of restoration

The affects of cement space thickness and material type with application of micro-CT scanner on marginal discrepancy of restoration

In-vitro evaluation of marginal and internal fit of 3-unit monolithic zirconia restorations fabricated using digital scanning technologies

Three‐dimensional evaluation of tooth preparation forms in paediatric zirconia crowns: An in vitro study

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