Comparison of Marginal and Internal Adaptation in Endocrowns Milled from Translucent Zirconia and Zirconium Lithium Silicate

Amini, Amirhesam; Zeighami, Somayeh; Ghodsi, Safoura

doi:10.1155/2021/1544067

Cited by 12 publications

(13 citation statements)

References 40 publications

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“…The results of the study showed that the marginal gap mean values ranged from 13.10 µm to 46.25 µm, which are below the clinically acceptable value of 120 µm as proposed by McLean and von Fraunhofer [ 21 ]. These results are consistent with previously reported values for endocrowns [ 8 , 9 ]. However, it should be noted that while the mean values in all study groups were below the acceptable limit, 10 out of 200 points in the 40 µm group had measurement values above 120 µm, indicating the importance of careful consideration of cement space parameters.…”

Section: Discussionsupporting

confidence: 94%

The Effect of Cement Space Parameters on the Marginal Adaptation of Milled Endocrowns: An In Vitro Study

Suliman¹,

Rayyan²

2023

Cureus

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Background Cement film space plays a significant role in achieving good adaptation of indirect restorations. The objective of this study is to investigate the effect of cement space parameters on the marginal adaptation of computer-aided design (CAD)/computer-assisted manufacturing (CAM) endocrowns. Methodology The coronal part of 10 freshly extracted human mandibular molars was reduced to a level of 1.5 mm above the cementoenamel junction (CEJ); then, root canal treatment was performed. On each tooth, four lithium disilicate endocrowns with different cement space parameters (40, 80, 120, and 160 µm) were designed and fabricated using CAD/CAM. Endocrowns were seated to their prepared teeth, and the vertical marginal gap was measured in 20 equidistant points for each endocrown using a stereomicroscope on 90× magnification. The mean marginal gaps of the four groups were compared using a one-way analysis of variance (ANOVA) and the Tukey honestly significant difference (HSD) test considering p<0.05 as the cutoff for statistical significance. Results The mean marginal gap of the 40 µm, 80 µm, 120 µm, and 160 µm groups were 46.25±21.20 µm, 21.75±11.10 µm, 15.94±06.62 µm, and 13.10±07.08 µm, respectively. One-way ANOVA showed a significant difference in the marginal gaps between groups (p<0.001). The Tukey post hoc test showed a statistically significant mean difference between 40 µm and each of the other three groups (p<0.001). Conclusion The cement space parameter variation affects the marginal adaptation of endocrowns. The cement space of 40 µm resulted in a higher marginal gap than cement spaces of 80, 120, and 160 µm.

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Section: Discussionsupporting

confidence: 94%

The Effect of Cement Space Parameters on the Marginal Adaptation of Milled Endocrowns: An In Vitro Study

Suliman¹,

Rayyan²

2023

Cureus

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“…Using SolidWorks, coronal tissues were cut 2 mm above the cementoenamel junction (CEJ) to simulate the extensive loss of coronal structures [ 5 , 28 , 29 ]. The occlusal margins were flat to represent butt joint preparation ( Figure 2 A) [ 5 , 29 ].…”

Section: Methodsmentioning

confidence: 99%

“…The occlusal margins were flat to represent butt joint preparation ( Figure 2 A) [ 5 , 29 ]. The pulp chamber was 3 mm in depth [ 30 ] with rounded angles and 10° internal wall divergence [ 4 , 28 , 29 ], ( Figure 2 B). A 0.1 mm thickness of the cement layer was also represented [ 10 , 31 ], as shown in Figure 2 B.…”

Section: Methodsmentioning

confidence: 99%

Biomechanical Assessment of Endodontically Treated Molars Restored by Endocrowns Made from Different CAD/CAM Materials

et al. 2023

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The aim of this study was to evaluate the deflection and stress distribution in endodontically treated molars restored by endocrowns from different materials available for the computer-aided design/computer-aided manufacturing (CAD/CAM) technique using three-dimensional finite element analysis. The models represented extensively damaged molars restored by endocrowns from the following materials: translucent zirconia; zirconia-reinforced glass ceramic; lithium disilicate glass ceramic; polymer-infiltrated ceramic network (PICN) and resin nanoceramic. Axial and oblique loadings were applied and the resulting stress distribution and deflection were analyzed. The Mohr–Coulomb (MC) ratio was also calculated in all models. The translucent zirconia endocrown showed the highest stress concentration within it and the least stress in dental structures. The resin nanoceramic model was associated with the greatest stress concentration in dental tissues, followed by the PICN model. Stress was also concentrated in the distal region of the cement layer. The MC ratio in the cement was higher than 1 in the resin nanoceramic model. Oblique loading caused higher stresses in all components and greater displacement than axial loading, whatever the material of the endocrown was. The translucent zirconia model recorded deflections of enamel and dentin (38.4 µm and 35.7 µm, respectively), while resin nanoceramic showed the highest stress concentration and displacement in the tooth–endocrown complex.

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“…Since stereomicroscope does not integrate any sectioning or destruction of the restorations, it's less destructive and less time consuming than other measuring techniques mentioned previously, while possible errors from sectioning are avoided. (32) However, in this technique it is difficult to repeat the measurements from a corresponding angle and to differentiate the actual marginal gap from its projection. (31) Also, it's challenging to select the most significant points where the marginal opening should be measured and to identify the most apical part of the preparation margin.…”

Section: Discussionmentioning

confidence: 99%

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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Comparison of Marginal and Internal Adaptation in Endocrowns Milled from Translucent Zirconia and Zirconium Lithium Silicate

Cited by 12 publications

References 40 publications

The Effect of Cement Space Parameters on the Marginal Adaptation of Milled Endocrowns: An In Vitro Study

The Effect of Cement Space Parameters on the Marginal Adaptation of Milled Endocrowns: An In Vitro Study

Biomechanical Assessment of Endodontically Treated Molars Restored by Endocrowns Made from Different CAD/CAM Materials

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

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