Micro-CT Analysis of Y-TZP Copings Made by Different CAD/CAM Systems: Marginal and Internal Fit

Purpose. The aim of the study was to measure the marginal and internal adaptation (MIA) of zirconia copings, made of 4 ceramic systems for CAD/CAM, using microcomputed tomography (micro-CT) technology. Material and Methods. Two identical stainless steel models were used, representing a preparation for full ceramic crown on a lower molar. The master models were then scanned for the production of copings from specific yttrium oxide partially stabilized tetragonal zirconia polycrystal ceramic blocks of each system (n=10): Cerec/inCoris Zi, Sirona; Cercon/Cercon base, Dentsply; Ceramill/Ceramill Zi, Amann Girrbach; and Lava/Lava Frame Zirconia, 3M ESPE. MIA was evaluated measuring 4 points as follows: marginal gap (MG), axial wall gap (AW), axio-occlusal angle gap (AO), and central occlusal area gap (CO). The data were statistically analyzed by ANOVA and Tukey’s test (α = 0.05). Results. The ceramic system Lava showed greater internal desadaptation (80.75 ± 22.69 µm) while CEREC presented the lowest values (49.92 ± 11.77 µm). There were significant differences between the measurement points evaluated. CO demonstrated the greater values (77.03 ± 22.61 µm). All marginal and internal adaptation values were considered clinically acceptable. Conclusion. It was concluded that there was an influence of the type of ceramic system in marginal and internal adaptation of copings in zirconia.

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Digital Procedures Compared to Conventional Gypsum Casts in the Manufacturing of CAD/CAM Adhesive Restorations: 3D Surface Trueness and Interfacial Adaptation Analysis

Applied Sciences ◽

10.3390/app11115060 ◽

2021 ◽

Vol 11 (11) ◽

pp. 5060

Author(s):

Andrea Baldi ◽

Allegra Comba ◽

Edoardo Alberto Vergano ◽

Michail L. Vakalis ◽

Mario Alovisi ◽

...

Keyword(s):

Ct Scan ◽

Ex Vivo ◽

Micro Ct ◽

Marginal Fit ◽

Cad Cam ◽

Ct Analysis ◽

3D Printed ◽

Tooth Preparation ◽

Internal Fit ◽

Ex Vivo Study

Objective. The purpose of this ex vivo study was to compare the trueness of traditional and digital workflows and to analyze the interfacial fit of CAD/CAM restorations on gypsum and 3D-printed casts (3DC). Methods: Forty patients underwent indirect posterior adhesive restorations. After tooth preparation, both traditional and chairside procedures were followed. Obtained models were scanned to generate STL files of the intraoral impression (IOS), the conventional cast (RS), and the 3D-printed cast (3DCS). Superimposition of the casts was performed to evaluate trueness. Then, for each preparation, two identical CAD/CAM restorations were milled and luted on RS and 3DC. Micro-CT scan was performed to evaluate 3D interfacial fit. Results. Surface trueness analysis showed no significant differences among groups (p > 0.05), with average trueness ranging from 11.56 to 17.01 µm. Micro-CT analysis showed significant differences between gypsum casts (average ranging from 135.78 to 212.31 µm) and 3DC (average ranging from 57.63 to 144.55 µm) for both marginal and internal fit. Conclusions. In adhesive restorations manufacturing, digital and conventional procedures generate casts that are not significantly different. Marginal fit of adhesive restorations is similar to conventional crown design and clinically acceptable. It is assumable that a direct digital workflow could benefit from the usage of 3DC.

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Integrative description of two new species of Malagasy chirping giant pill-millipedes, genus Sphaeromimus (Diplopoda: Sphaerotheriida: Arthrosphaeridae)

European Journal of Taxonomy ◽

10.5852/ejt.2017.381 ◽

2017 ◽

Cited By ~ 5

Author(s):

Leif Moritz ◽

Thomas Wesener

Keyword(s):

New Species ◽

Coi Gene ◽

Micro Ct ◽

Mitochondrial Coi ◽

Taxonomic Description ◽

Mitochondrial Coi Gene ◽

Two New Species ◽

Ct Analysis ◽

Ct Technology ◽

First Time

The species-rich giant pill-millipedes (Sphaerotheriida) often represent a microendemic component of Madagascar’s mega-invertebrate fauna. Of the chirping genus Sphaeromimus de Saussure & Zehntner, 1902, ten species have been described. Here, we describe two new species of Sphaeromimus integratively, combining light microscopy, scanning electron microscopy, DNA barcoding and micro-CT technology for the first time in a taxonomic description of a giant pill-millipede. S. kalambatritra sp. nov. and S. midongy sp. nov. are the first giant pill-millipedes collected and described from the mountainous rainforests of Kalambatritra and Midongy. Both species show island gigantism compared to their congeners. Our analysis of the mitochondrial COI gene shows that the two species are related to one another with a moderate genetic distance (9.4%), while they are more closely related to an undetermined specimen from the forest of Vevembe (6.3% and 8.4%). They stand in a basal position with S. ivohibe Wesener, 2014 and S. musicus (de Saussure & Zehntner, 1897). The four aforementioned species share a high number of stridulation ribs on the male harp. Our micro-CT analysis provides a look into the head of S. kalambatritra sp. nov. and shows that non-destructive CT methods are a useful tool for studying the inner morphology of giant pill-millipedes.

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Marginal Fit Evaluation of CAD/CAM All Ceramic Crowns Obtained by Two Digital Workflows: An In Vitro Study Using Micro‐CT Technology

Journal of Prosthodontics ◽

10.1111/jopr.13115 ◽

2019 ◽

Vol 28 (9) ◽

pp. 1037-1043 ◽

Cited By ~ 3

Author(s):

Ibrahim Salim Duqum ◽

Christian Brenes ◽

Gustavo Mendonca ◽

Thiago Almedia Prado Naves Carneiro ◽

Lyndon F. Cooper

Keyword(s):

In Vitro Study ◽

Vitro Study ◽

Micro Ct ◽

Marginal Fit ◽

All Ceramic ◽

Cad Cam ◽

Ct Technology ◽

Ceramic Crowns

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Influence of Manufacturing Methods of Implant-Supported Crowns on External and Internal Marginal Fit: A Micro-CT Analysis

BioMed Research International ◽

10.1155/2018/5049605 ◽

2018 ◽

Vol 2018 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Izabela C. M. Moris ◽

Silas Borges Monteiro ◽

Raíssa Martins ◽

Ricardo Faria Ribeiro ◽

Erica A. Gomes

Keyword(s):

Qualitative Evaluation ◽

Insertion Torque ◽

Micro Ct ◽

Marginal Fit ◽

Manufacturing Method ◽

Significant Difference ◽

Cad Cam ◽

Computed Microtomography ◽

Ct Analysis ◽

Manufacturing Methods

Aim.To evaluate the influence of different manufacturing methods of single implant-supported metallic crowns on the internal and external marginal fit through computed microtomography.Methods.Forty external hexagon implants were divided into 4 groups(n=8), according to the manufacturing method: GC, conventional casting; GI, induction casting; GP, plasma casting; and GCAD, CAD/CAM machining. The crowns were attached to the implants with insertion torque of 30 N·cm. The external (vertical and horizontal) marginal fit and internal fit were assessed through computed microtomography. Internal and external marginal fit data (μm) were submitted to a one-way ANOVA and Tukey’s test(α=.05). Qualitative evaluation of the images was conducted by using micro-CT.Results.The statistical analysis revealed no significant difference between the groups for vertical misfit(P=0.721). There was no significant difference(P>0.05)for the internal and horizontal marginal misfit in the groups GC, GI, and GP, but it was found for the group GCAD(P≤0.05). Qualitative analysis revealed that most of the samples of cast groups exhibited crowns underextension while the group GCAD showed overextension.Conclusions.The manufacturing method of the crowns influenced the accuracy of marginal fit between the prosthesis and implant. The best results were found for the crowns fabricated through CAD/CAM machining.

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Evaluation of marginal and internal fit of ceramic and metallic crown copings using x-ray microtomography (micro-CT) technology

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2015.02.002 ◽

2015 ◽

Vol 114 (2) ◽

pp. 223-228 ◽

Cited By ~ 36

Author(s):

Manuel Antonio Pimenta ◽

Luis Carlos Frasca ◽

Ricardo Lopes ◽

Elken Rivaldo

Keyword(s):

Micro Ct ◽

X Ray ◽

Ct Technology ◽

Internal Fit

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Marginal and internal adaptation of ceramic crown restorations fabricated with CAD/CAM technology and the heat-press technique

Journal of Prosthetic Dentistry ◽

10.1016/j.prosdent.2014.03.017 ◽

2014 ◽

Vol 112 (2) ◽

pp. 249-256 ◽

Cited By ~ 83

Author(s):

Hisham A. Mously ◽

Matthew Finkelman ◽

Roya Zandparsa ◽

Hiroshi Hirayama

Keyword(s):

Cad Cam ◽

Internal Adaptation ◽

Ceramic Crown

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

Brazilian Dental Science ◽

10.14295/bds.2021.v24i1.1968 ◽

2020 ◽

Vol 24 (1) ◽

Author(s):

Mosharraf Mosharraf ◽

Amir Azizi ◽

Babak Naziri ◽

Majid Abolhasani

Keyword(s):

Clinical Success ◽

Micro Ct ◽

Ct Scanner ◽

3D Scanner ◽

Cad Cam ◽

Monolithic Zirconia ◽

Marginal Discrepancy ◽

Spss Software ◽

Internal Fit

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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The effect of different finish lines on marginal and internal fit of a ceramic crown fabricated by CAD/CAM system

Journal of Oral Hygiene & Health ◽

10.4172/2332-0702-c1-006 ◽

2017 ◽

Vol 05 (01) ◽

Author(s):

Alaa Elaraby

Keyword(s):

Cad Cam ◽

Internal Fit ◽

Ceramic Crown

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Micro-CT Evaluation of the Marginal and Internal Fit of Crown and Inlay Restorations Fabricated Via Different Digital Scanners belonging to the Same CAD-CAM System

The International Journal of Prosthodontics ◽

10.11607/ijp.6822 ◽

2021 ◽

Author(s):

Zeynep Ekici ◽

Mehmet Kılıçarslan ◽

Burak Bilecenoğlu ◽

Mert Ocak

Keyword(s):

Micro Ct ◽

Cad Cam ◽

Ct Evaluation ◽

Internal Fit

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In vitro Evaluation of the Marginal Fit and Internal Adaptation of Zirconia and Lithium Disilicate Single Crowns: Micro-CT Comparison Between Different Manufacturing Procedures

The Open Dentistry Journal ◽

10.2174/1874210601812010160 ◽

2018 ◽

Vol 12 (1) ◽

pp. 160-172 ◽

Cited By ~ 11

Author(s):

Francesco Riccitiello ◽

Massimo Amato ◽

Renato Leone ◽

Gianrico Spagnuolo ◽

Roberto Sorrentino

Keyword(s):

Clinical Success ◽

Lithium Disilicate ◽

Resin Cement ◽

Micro Ct ◽

Marginal Fit ◽

Restorative Materials ◽

Cad Cam ◽

Internal Adaptation ◽

Single Crowns

Background:Prosthetic precision can be affected by several variables, such as restorative materials, manufacturing procedures, framework design, cementation techniques and aging. Marginal adaptation is critical for long-term longevity and clinical success of dental restorations. Marginal misfit may lead to cement exposure to oral fluids, resulting in microleakage and cement dissolution. As a consequence, marginal discrepancies enhance percolation of bacteria, food and oral debris, potentially causing secondary caries, endodontic inflammation and periodontal disease.Objective:The aim of the presentin vitrostudy was to evaluate the marginal and internal adaptation of zirconia and lithium disilicate single crowns, produced with different manufacturing procedures.Methods:Forty-five intact human maxillary premolars were prepared for single crowns by means of standardized preparations. All-ceramic crowns were fabricated with either CAD-CAM or heat-pressing procedures (CAD-CAM zirconia, CAD-CAM lithium disilicate, heat-pressed lithium disilicate) and cemented onto the teeth with a universal resin cement. Non-destructive micro-CT scanning was used to achieve the marginal and internal gaps in the coronal and sagittal planes; then, precision of fit measurements were calculated in a dedicated software and the results were statistically analyzed.Results:The heat-pressed lithium disilicate crowns were significantly less accurate at the prosthetic margins (p<0.05) while they performed better at the occlusal surface (p<0.05). No significant differences were noticed between CAD-CAM zirconia and lithium disilicate crowns (p>0.05); nevertheless CAD-CAM zirconia copings presented the best marginal fit among the experimental groups. As to the thickness of the cement layer, reduced amounts of luting agent were noticed at the finishing line, whereas a thicker layer was reported at the occlusal level.Conclusion:Within the limitations of the presentin vitroinvestigation, the following conclusions can be drawn: the recorded marginal gaps were within the clinical acceptability irrespective of both the restorative material and the manufacturing procedures; the CAD-CAM processing techniques for both zirconia and lithium disilicate produced more consistent marginal gaps than the heat-pressing procedures; the tested universal resin cement can be safely used with both restorative materials.

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