Marginal gap of monolithic zirconia endocrowns fabricated by using digital scanning and conventional impressions

Falahchai, Mehran; Hemmati, Yasamin Babaee; Asli, Hamid Neshandar; Emadi, Iman

doi:10.1016/j.prosdent.2020.05.042

Cited by 13 publications

(16 citation statements)

References 36 publications

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“…(27) Abduljawad and Rayyan (2) , reported significantly higher marginal gap in endocrowns fabricated by conventional impression which could be also attributed to the discrepancy caused by the impression and die material in addition to the presence of human factor for extra laboratory steps that are expected to produce more errors. Our results were also in agreement with Homsy et al (23) , Sharma et al (33) , and Shamseddin et al (43) However, Falahchai et al (42) , reported similar marginal gap values for endocrowns fabricated with conventional and digital impression. Similar results were also reported by other studies like Abdel-Azim et al (7) , Dauti et al (11) , and Sakornwimon and Leevailoj (44) where no significant difference was found between intraoral digital scanning and conventional impression in the margin adaptation of full coverage ceramic crowns.…”

Section: Discussionsupporting

confidence: 92%

“…(23,41) The direct comparison between different studies is limited because they didn't apply a standardized protocol regarding preparation designs, materials used, CAD/CAM systems, fabrication techniques and methods of measurements. (42) The pulpal floor showed significantly the largest gap in the two tested groups, followed by axiopulpal angle, axio-margin and finally the marginal gap (p < 0.05). However, the axial gaps (A1 and A2) didn't show a significant difference in both groups (p = 0.02) (Table 1).…”

Section: Discussionmentioning

confidence: 84%

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Internal fit and marginal adaptation of CAD/CAM lithium disilicate endocrowns fabricated with conventional impression and digital scanning protocols. An in-vitro study

Nassar

2022

Egyptian Dental Journal

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Aim: To evaluate the internal and marginal adaptation of computer aided design/computer aided manufacturer fabricated lithium disilicate endocrowns restoring endodontically treated maxillary molars and produced by conventional impression and digital scanning protocols. Materials and methods:Thirty freshly extracted maxillary molars were prepared to receive endocrowns. Teeth were divided into two groups: conventional impression (n=15) and digital scanning (n=15). After restorations designing on CAD/CAM software, endocrowns were milled from Amber® mill lithium disilicate blocks. The internal gap was assessed by replica technique and stereomicroscope selecting 32 measurements for each restoration while, the mean marginal gap was assessed by stereomicroscope before and after cementation and thermocycling. Internal gap values were analyzed by Independent t-test, One Way ANOVA test for different landmark comparison, Tukey`s Post Hoc test for multiple comparisons, and Repetitive One-Way ANOVA test for marginal gap values before and after cementation.Results: Statistically significant difference in gap values was recorded between different impression protocols and regions (p < 0.05). digital scanning displayed significantly smaller gaps than conventional impression in all regions (p < 0.001). The largest gap was at pulpal floor in both groups. Marginal gap after cementation was larger than before cementation in both groups (p < 0.0001) Conclusions: Digital scanning protocol produced endocrowns with superior internal and marginal adaption than those produced with conventional impression protocol. Pulpal floor showed the highest gap values in all tested regions while, margin showed the lowest gap. Cementation and thermocycling increased the marginal discrepancies but still within the clinically acceptable range.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 84%

Internal fit and marginal adaptation of CAD/CAM lithium disilicate endocrowns fabricated with conventional impression and digital scanning protocols. An in-vitro study

Nassar

2022

Egyptian Dental Journal

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“…In the processes of fabricating and restoring prostheses, it is crucial to take impressions accurately [1][2][3]. The use of conventional impression material for taking impressions causes the patient discomfort, such as gagging; further, there may be various problems, such as the possibility of deformation of the impression material and contamination by the saliva and blood in the oral cavity [3,4].…”

Section: Introductionmentioning

confidence: 99%

Marginal and Internal Fit of Ceramic Restorations Fabricated Using Digital Scanning and Conventional Impressions: A Clinical Study

Lee

2020

JCM

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This clinical study was designed with the aim of fabricating four ceramic crowns using the conventional method and digital methods with three different intraoral scanners and evaluate the marginal and internal fit as well as clinician satisfaction. We enrolled 20 subjects who required ceramic crowns in the upper or lower molar or the premolar. Impressions were obtained using digital scans, with conventional impressions (polyvinyl siloxane and desktop scanner) and three different intraoral scanners (EZIS PO, i500, and CS3600). Four lithium disilicate glass-ceramic crowns were fabricated for each patient. In the oral cavity, the proximal and occlusal adjustments were performed, and the marginal fit and internal fit were evaluated using the silicone replica technique. The clinician satisfaction score of the four crowns was evaluated as per the evaluations of the proximal and occlusal contacts made during the adjustment process and the marginal and internal fit. For statistical analysis, the differences among the groups were analyzed with one-way analysis of variance and Tukey HSD test as a post-test; Pearson correlation analysis was used for analyzing the correlations (α = 0.05). There was a significant difference in the marginal and internal fit of the ceramic crowns fabricated using three intraoral scanner types and one desktop scanner type (p < 0.001); there was a significant difference in the clinician satisfaction scores (p = 0.04). The clinician satisfaction score and marginal fit were significantly correlated (absolute marginal discrepancy and marginal gap) (p < 0.05). An impression technique should be considered for fabricating a ceramic crown with excellent goodness-of-fit. Further, higher clinician satisfaction could be obtained by reproducing the excellent goodness-of-fit using the intraoral scanning method as compared to the conventional method.

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“…Considering the optimal properties of zirconia, it is commonly used as a prosthetic restorative material. [ 21 ] Thus, orthodontists may commonly encounter zirconia restorations in patients' mouth. However, zirconia has poorer bonding properties than the enamel, which makes it challenging to obtain adequately high bond strength of orthodontic brackets to zirconia restorations.…”

Section: Discussionmentioning

confidence: 99%

Effect of Different Surface Treatments and Orthodontic Bracket Type on Shear Bond Strength of High-Translucent Zirconia: An In Vitro Study

Hemmati

Asli

Falahchai

et al. 2022

International Journal of Dentistry

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Objective. Considering the increasing number of adults seeking orthodontic treatment, and the possible need for bracket bonding to monolithic zirconia restorations, knowledge about the preferred type of bracket (metal/ceramic) and the most efficient surface treatment is imperative to achieve acceptable shear bond strength (SBS). This study aimed to assess the effect of different surface treatments and orthodontic bracket types on SBS of high-translucent zirconia. Materials and Methods. Totally, 248 disc-shaped zirconia specimens were assigned to two groups for bonding to metal and ceramic brackets. Each group was divided into four subgroups (n = 31) for the following surface treatments: no surface treatment (control group), airborne-particle abrasion (APA), tribochemical silica coating with CoJet, and CO2 laser irradiation. The mean surface roughness (Ra value) was measured. The SBS was measured after bracket bonding and thermocycling. Data were analyzed by two-way ANOVA, Tukey, Kruskal–Wallis, Mann–Whitney, and Fisher exact tests, and Bonferroni correction ( α = 0. 05 ). Results. The mean Ra value was significantly different among the surface treatment subgroups ( P < 0.001 ). The APA and CoJet subgroups were not significantly different regarding Ra ( P = 0.754 ). All other pairwise comparisons yielded significant differences ( P < 0.001 ). Bracket type, surface treatment, and their interaction significantly affected the SBS ( P < 0.001 ). Ceramic brackets bonded to zirconia surfaces treated with CoJet yielded the maximum SBS while ceramic brackets bonded to control and lased surfaces resulted in minimum SBS. No significant difference was noted in the SBS of different surface treatment groups when metal brackets were used ( P > 0.05 ). Conclusions. The use of ceramic brackets and CoJet surface treatment would be the most appropriate combination to achieve optimal bonding to high-translucent zirconia restorations.

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Marginal gap of monolithic zirconia endocrowns fabricated by using digital scanning and conventional impressions

Cited by 13 publications

References 36 publications

Internal fit and marginal adaptation of CAD/CAM lithium disilicate endocrowns fabricated with conventional impression and digital scanning protocols. An in-vitro study

Internal fit and marginal adaptation of CAD/CAM lithium disilicate endocrowns fabricated with conventional impression and digital scanning protocols. An in-vitro study

Marginal and Internal Fit of Ceramic Restorations Fabricated Using Digital Scanning and Conventional Impressions: A Clinical Study

Effect of Different Surface Treatments and Orthodontic Bracket Type on Shear Bond Strength of High-Translucent Zirconia: An In Vitro Study

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