Effect of central cavity depth and ferrule on the mechanical retention of endo-crowns
Introduction: This study evaluated the effect of central cavitation depth and the presence of ferrule on the mechanical retention of zirconia endo-crowns.Methods: A mandibular molar was selected and scanned after different preparations. The preparation designs were grouped as follows: Group 1 (Contr...
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| Format: | Article |
| Language: | English |
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Mashhad University of Medical Sciences
2023-03-01
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| Series: | Journal of Dental Materials and Techniques |
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| Online Access: | https://jdmt.mums.ac.ir/article_22052_b02a4f99fd2fa5c90c9afc5b8a331c63.pdf |
| _version_ | 1827973519928983552 |
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| author | Azam Sadat Madani Madani Hossein Bagheri Neda Jarahi Hossein Hosseini Zarch Maryam Ahmadi |
| author_facet | Azam Sadat Madani Madani Hossein Bagheri Neda Jarahi Hossein Hosseini Zarch Maryam Ahmadi |
| author_sort | Azam Sadat Madani Madani |
| collection | DOAJ |
| description | Introduction: This study evaluated the effect of central cavitation depth and the presence of ferrule on the mechanical retention of zirconia endo-crowns.Methods: A mandibular molar was selected and scanned after different preparations. The preparation designs were grouped as follows: Group 1 (Control): Full coverage complete crown, group 2 (EF4): endo-crown with 4 mm central cavity depth and ferrule, group 3 (E4): butt joint endo-crown with 4 mm central cavity depth, group 4 (E2): butt joint endo-crown with 2 mm central cavity depth, and group 5 (EF2): endo-crown with 2 mm central cavity depth and ferrule. Then zirconia copings were made using computer-aided design (CAD) and computer-aided manufacturing (CAM) and cemented by glass ionomer. After thermocycling, the specimens were subjected to a tensile test along the axis and at an angle of 30°.Results: All restorations in E2 were deboned during thermocycling. There was no significant difference between the other groups in pulling-out forces. Pulling-out forces under the axial test were 75.7 N, 84.7 N, 98.7 N, and 80.9 N, and under the lateral force were 21.2 N, 27.5 N, 35.4 N, and 28.5 N, for the control, E4, EF4, and EF2 groups, respectively. The difference in pulling-out forces was not significant between the control, E4, EF4, and EF2 groups (P=0.46).Conclusion: The presence of ferrule increased mechanical retention to some extent. It appears that peripheral reduction in the aims of gaining a ferrule may increase mechanical retention in teeth with shallow cavity depths. (J Dent Mater Tech 2023;12(1): 35-42) |
| first_indexed | 2024-04-09T19:38:24Z |
| format | Article |
| id | doaj.art-10e3c8a8069e4d918fd2b751e6845bfa |
| institution | Directory Open Access Journal |
| issn | 2322-4150 2252-0317 |
| language | English |
| last_indexed | 2024-04-09T19:38:24Z |
| publishDate | 2023-03-01 |
| publisher | Mashhad University of Medical Sciences |
| record_format | Article |
| series | Journal of Dental Materials and Techniques |
| spelling | doaj.art-10e3c8a8069e4d918fd2b751e6845bfa2023-04-04T09:11:41ZengMashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41502252-03172023-03-01121354210.22038/jdmt.2023.66644.152822052Effect of central cavity depth and ferrule on the mechanical retention of endo-crownsAzam Sadat Madani Madani0Hossein Bagheri1Neda Jarahi2Hossein Hosseini Zarch3Maryam Ahmadi4Department of Prosthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.Prosthodontist, Mashhad, Iran.Department of Oral & Maxillofacial Radiology, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.Dentist, Mashhad, IranIntroduction: This study evaluated the effect of central cavitation depth and the presence of ferrule on the mechanical retention of zirconia endo-crowns.Methods: A mandibular molar was selected and scanned after different preparations. The preparation designs were grouped as follows: Group 1 (Control): Full coverage complete crown, group 2 (EF4): endo-crown with 4 mm central cavity depth and ferrule, group 3 (E4): butt joint endo-crown with 4 mm central cavity depth, group 4 (E2): butt joint endo-crown with 2 mm central cavity depth, and group 5 (EF2): endo-crown with 2 mm central cavity depth and ferrule. Then zirconia copings were made using computer-aided design (CAD) and computer-aided manufacturing (CAM) and cemented by glass ionomer. After thermocycling, the specimens were subjected to a tensile test along the axis and at an angle of 30°.Results: All restorations in E2 were deboned during thermocycling. There was no significant difference between the other groups in pulling-out forces. Pulling-out forces under the axial test were 75.7 N, 84.7 N, 98.7 N, and 80.9 N, and under the lateral force were 21.2 N, 27.5 N, 35.4 N, and 28.5 N, for the control, E4, EF4, and EF2 groups, respectively. The difference in pulling-out forces was not significant between the control, E4, EF4, and EF2 groups (P=0.46).Conclusion: The presence of ferrule increased mechanical retention to some extent. It appears that peripheral reduction in the aims of gaining a ferrule may increase mechanical retention in teeth with shallow cavity depths. (J Dent Mater Tech 2023;12(1): 35-42)https://jdmt.mums.ac.ir/article_22052_b02a4f99fd2fa5c90c9afc5b8a331c63.pdfcentral cavitation depthsendo-crownferrulemechanical retentionzirconia |
| spellingShingle | Azam Sadat Madani Madani Hossein Bagheri Neda Jarahi Hossein Hosseini Zarch Maryam Ahmadi Effect of central cavity depth and ferrule on the mechanical retention of endo-crowns Journal of Dental Materials and Techniques central cavitation depths endo-crown ferrule mechanical retention zirconia |
| title | Effect of central cavity depth and ferrule on the mechanical retention of endo-crowns |
| title_full | Effect of central cavity depth and ferrule on the mechanical retention of endo-crowns |
| title_fullStr | Effect of central cavity depth and ferrule on the mechanical retention of endo-crowns |
| title_full_unstemmed | Effect of central cavity depth and ferrule on the mechanical retention of endo-crowns |
| title_short | Effect of central cavity depth and ferrule on the mechanical retention of endo-crowns |
| title_sort | effect of central cavity depth and ferrule on the mechanical retention of endo crowns |
| topic | central cavitation depths endo-crown ferrule mechanical retention zirconia |
| url | https://jdmt.mums.ac.ir/article_22052_b02a4f99fd2fa5c90c9afc5b8a331c63.pdf |
| work_keys_str_mv | AT azamsadatmadanimadani effectofcentralcavitydepthandferruleonthemechanicalretentionofendocrowns AT hosseinbagheri effectofcentralcavitydepthandferruleonthemechanicalretentionofendocrowns AT nedajarahi effectofcentralcavitydepthandferruleonthemechanicalretentionofendocrowns AT hosseinhosseinizarch effectofcentralcavitydepthandferruleonthemechanicalretentionofendocrowns AT maryamahmadi effectofcentralcavitydepthandferruleonthemechanicalretentionofendocrowns |