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Assessment of marginal adaptation and fracture resistance of endocrown restorations utilizing different machinable blocks subjected to thermomechanical aging.
J Esthet Restor Dent. 2018 07; 30(4):319-328.JE

Abstract

OBJECTIVE

This in vitro study was conducted to assess the marginal adaptation and fracture resistance of computer aided design/computer aided manufacturer (CAD-CAM) fabricated endocrowns restoring endodontically treated molars using different machinable blocks with thermomechanical loading protocols.

MATERIALS AND METHODS

Devitalized mandibular molars were prepared in a standardized way and divided into 4 groups (n = 10) to receive CAD/CAM fabricated endocrowns using four materials (Lithium disilicate ceramics, polymer infiltrated ceramics, zirconia-reinforced lithium silicate ceramics and resin nanoceramics. Marginal gaps (µm) were measured using stereomicroscope before cementation and after cementation. After thermomechanical aging, marginal gap measurements were repeated, and then fracture resistance test was performed. Two-way analysis of variance (ANOVA) and Tukey HSD multiple comparisons were used to assess the effect of material on the marginal gap before, after cementation, and after thermomechanical aging. One Way ANOVA was used to assess the effect of material on the fracture resistance.

RESULTS

The difference between marginal gaps values of the tested materials was statistically insignificant but with significant increase after cementation and after thermomechanical aging. Cerasmart endocrowns showed the highest mean fracture load value (1508.5 ± 421.7N) with statistically significant difference than Vita Enamic endocrowns and Celtra Duo.

CONCLUSION

The tested materials showed marginal vertical gap readings within the limits of clinically acceptable standards. Resin nanoceramics and lithium disilicate showed the highest values of fracture resistance followed by polymer infiltrated ceramics favoring their use for endocrown restorations.

CLINICAL SIGNIFICANCE

The mechanical behavior of ceramic materials varies with the variation of their structure and mechanical properties. Accordingly, further investigation is always needed to explore the biomechanical behavior of recent materials when used as endocrowns before clinical trials.

Authors+Show Affiliations

Section Medical Materials science & technology, University Hospital Tübingen, Tübingen, Germany. Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.Section Medical Materials Science & Technology, University Hospital Tübingen, Germany.Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30113129

Citation

Taha, Doaa, et al. "Assessment of Marginal Adaptation and Fracture Resistance of Endocrown Restorations Utilizing Different Machinable Blocks Subjected to Thermomechanical Aging." Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.], vol. 30, no. 4, 2018, pp. 319-328.
Taha D, Spintzyk S, Sabet A, et al. Assessment of marginal adaptation and fracture resistance of endocrown restorations utilizing different machinable blocks subjected to thermomechanical aging. J Esthet Restor Dent. 2018;30(4):319-328.
Taha, D., Spintzyk, S., Sabet, A., Wahsh, M., & Salah, T. (2018). Assessment of marginal adaptation and fracture resistance of endocrown restorations utilizing different machinable blocks subjected to thermomechanical aging. Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.], 30(4), 319-328. https://doi.org/10.1111/jerd.12396
Taha D, et al. Assessment of Marginal Adaptation and Fracture Resistance of Endocrown Restorations Utilizing Different Machinable Blocks Subjected to Thermomechanical Aging. J Esthet Restor Dent. 2018;30(4):319-328. PubMed PMID: 30113129.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Assessment of marginal adaptation and fracture resistance of endocrown restorations utilizing different machinable blocks subjected to thermomechanical aging. AU - Taha,Doaa, AU - Spintzyk,Sebastian, AU - Sabet,Ahmed, AU - Wahsh,Marwa, AU - Salah,Tarek, Y1 - 2018/08/16/ PY - 2018/02/09/received PY - 2018/04/22/revised PY - 2018/05/13/accepted PY - 2018/8/17/pubmed PY - 2019/11/27/medline PY - 2018/8/17/entrez KW - Computer-Aided Design/Computer-Aided Manufacturing KW - ceramics KW - endodontically treated teeth SP - 319 EP - 328 JF - Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] JO - J Esthet Restor Dent VL - 30 IS - 4 N2 - OBJECTIVE: This in vitro study was conducted to assess the marginal adaptation and fracture resistance of computer aided design/computer aided manufacturer (CAD-CAM) fabricated endocrowns restoring endodontically treated molars using different machinable blocks with thermomechanical loading protocols. MATERIALS AND METHODS: Devitalized mandibular molars were prepared in a standardized way and divided into 4 groups (n = 10) to receive CAD/CAM fabricated endocrowns using four materials (Lithium disilicate ceramics, polymer infiltrated ceramics, zirconia-reinforced lithium silicate ceramics and resin nanoceramics. Marginal gaps (µm) were measured using stereomicroscope before cementation and after cementation. After thermomechanical aging, marginal gap measurements were repeated, and then fracture resistance test was performed. Two-way analysis of variance (ANOVA) and Tukey HSD multiple comparisons were used to assess the effect of material on the marginal gap before, after cementation, and after thermomechanical aging. One Way ANOVA was used to assess the effect of material on the fracture resistance. RESULTS: The difference between marginal gaps values of the tested materials was statistically insignificant but with significant increase after cementation and after thermomechanical aging. Cerasmart endocrowns showed the highest mean fracture load value (1508.5 ± 421.7N) with statistically significant difference than Vita Enamic endocrowns and Celtra Duo. CONCLUSION: The tested materials showed marginal vertical gap readings within the limits of clinically acceptable standards. Resin nanoceramics and lithium disilicate showed the highest values of fracture resistance followed by polymer infiltrated ceramics favoring their use for endocrown restorations. CLINICAL SIGNIFICANCE: The mechanical behavior of ceramic materials varies with the variation of their structure and mechanical properties. Accordingly, further investigation is always needed to explore the biomechanical behavior of recent materials when used as endocrowns before clinical trials. SN - 1708-8240 UR - https://www.unboundmedicine.com/medline/citation/30113129/Assessment_of_marginal_adaptation_and_fracture_resistance_of_endocrown_restorations_utilizing_different_machinable_blocks_subjected_to_thermomechanical_aging_ L2 - https://doi.org/10.1111/jerd.12396 DB - PRIME DP - Unbound Medicine ER -