Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro study
Objective: This study evaluated the effects of finish-line design, tooth preparation taper or total occlusal convergence (TOC), and digital production technology on the retention of provisional crowns for molars. Material and Methods: Different taper angles (10° TOC and 20° TOC) and finish line des...
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| Format: | Article |
| Language: | English |
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Springer
2024-11-01
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| Series: | Saudi Dental Journal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S101390522400258X |
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| author | Firas K. Alqarawi Mohammed E. Sayed Harisha Dewan Fawzia Ibraheem Shaabi Hina Naim Manawar Ahmad Hanan Ibrahim Hakami Ebrahim Fihaid Alsubaiy Areen Sultan Saad Saleh AlResayes |
| author_facet | Firas K. Alqarawi Mohammed E. Sayed Harisha Dewan Fawzia Ibraheem Shaabi Hina Naim Manawar Ahmad Hanan Ibrahim Hakami Ebrahim Fihaid Alsubaiy Areen Sultan Saad Saleh AlResayes |
| author_sort | Firas K. Alqarawi |
| collection | DOAJ |
| description | Objective: This study evaluated the effects of finish-line design, tooth preparation taper or total occlusal convergence (TOC), and digital production technology on the retention of provisional crowns for molars. Material and Methods: Different taper angles (10° TOC and 20° TOC) and finish line designs (chamfer and shoulder) were used to prepare four mandibular first molar teeth. Two subgroups of the prepared teeth received temporary crowns that were either “Computer-Aided Design” and “Computer-Aided Manufacturing (CAD/CAM) milled or 3D printed. Hence, eight test groups of temporary crowns containing 10 samples each were created. Groups 1–4 were milled, and Groups 5–8 were 3D printed specimens. A consistent procedure was used to cement 80 temporary crowns. The specimens were thermocycled for a total of 5000 heat cycles, initially at 5 °C for 30 s (dwell time) and then at 55 °C for 30 s. The pull-off force necessary to remove the temporary crowns was recorded, and the tensile strength, which served as the dependent variable, was calculated. Analysis of variance (ANOVA) was used to assess the variations in retention forces among the test groups. Results: The mean tensile strengths at maximum load [MPa] were higher in Groups 5, 6, 7, 8 (6.6 MPa, 6.91 MPa, 7.65 MPa, and 7.45 MPa respectively) as compared to the mean tensile strengths at maximum load [MPa] in Groups 1, 2, 3, 4 (2.35 MPa, 3.52 MPa, 3.21 MPa, and 2.45 MPa respectively). Conclusion: For extended periods, 3D-printed crowns with steeper preparation tapers (20° TOC) and shoulder finish lines exhibited enhanced retention. |
| format | Article |
| id | doaj-art-12c5874b1df54e978d8d2bea57aa753e |
| institution | OA Journals |
| issn | 1013-9052 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Springer |
| record_format | Article |
| series | Saudi Dental Journal |
| spelling | doaj-art-12c5874b1df54e978d8d2bea57aa753e2025-08-20T01:58:59ZengSpringerSaudi Dental Journal1013-90522024-11-0136111477148210.1016/j.sdentj.2024.09.008Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro studyFiras K. Alqarawi0Mohammed E. Sayed1Harisha Dewan2Fawzia Ibraheem Shaabi3Hina Naim4Manawar Ahmad5Hanan Ibrahim Hakami6Ebrahim Fihaid Alsubaiy7Areen Sultan8Saad Saleh AlResayes9Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam 31441, Saudi ArabiaDepartment of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia; Corresponding authors.Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia; Corresponding authors.Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi ArabiaDepartment of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi ArabiaDepartment of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi ArabiaMinistry of Health, Jazan Sector, Jazan 45142, Saudi ArabiaDepartment of Prosthodontics, College of Dentistry, King Khalid University, Abha 62529, Saudi ArabiaCollege of Dentistry, Jazan University, Jazan 45142, Saudi ArabiaDepartment of Prosthetic Dental Sciences, King Saud University College of Dentistry, Riyadh, Saudi ArabiaObjective: This study evaluated the effects of finish-line design, tooth preparation taper or total occlusal convergence (TOC), and digital production technology on the retention of provisional crowns for molars. Material and Methods: Different taper angles (10° TOC and 20° TOC) and finish line designs (chamfer and shoulder) were used to prepare four mandibular first molar teeth. Two subgroups of the prepared teeth received temporary crowns that were either “Computer-Aided Design” and “Computer-Aided Manufacturing (CAD/CAM) milled or 3D printed. Hence, eight test groups of temporary crowns containing 10 samples each were created. Groups 1–4 were milled, and Groups 5–8 were 3D printed specimens. A consistent procedure was used to cement 80 temporary crowns. The specimens were thermocycled for a total of 5000 heat cycles, initially at 5 °C for 30 s (dwell time) and then at 55 °C for 30 s. The pull-off force necessary to remove the temporary crowns was recorded, and the tensile strength, which served as the dependent variable, was calculated. Analysis of variance (ANOVA) was used to assess the variations in retention forces among the test groups. Results: The mean tensile strengths at maximum load [MPa] were higher in Groups 5, 6, 7, 8 (6.6 MPa, 6.91 MPa, 7.65 MPa, and 7.45 MPa respectively) as compared to the mean tensile strengths at maximum load [MPa] in Groups 1, 2, 3, 4 (2.35 MPa, 3.52 MPa, 3.21 MPa, and 2.45 MPa respectively). Conclusion: For extended periods, 3D-printed crowns with steeper preparation tapers (20° TOC) and shoulder finish lines exhibited enhanced retention.http://www.sciencedirect.com/science/article/pii/S101390522400258XDigital manufacturingPreparation taperFinish line designRetentionMolar temporary crowns |
| spellingShingle | Firas K. Alqarawi Mohammed E. Sayed Harisha Dewan Fawzia Ibraheem Shaabi Hina Naim Manawar Ahmad Hanan Ibrahim Hakami Ebrahim Fihaid Alsubaiy Areen Sultan Saad Saleh AlResayes Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro study Saudi Dental Journal Digital manufacturing Preparation taper Finish line design Retention Molar temporary crowns |
| title | Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro study |
| title_full | Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro study |
| title_fullStr | Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro study |
| title_full_unstemmed | Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro study |
| title_short | Cumulative effect of digital manufacturing techniques, preparation taper and finish line designs on the retention of aged temporary molar crowns − An in vitro study |
| title_sort | cumulative effect of digital manufacturing techniques preparation taper and finish line designs on the retention of aged temporary molar crowns an in vitro study |
| topic | Digital manufacturing Preparation taper Finish line design Retention Molar temporary crowns |
| url | http://www.sciencedirect.com/science/article/pii/S101390522400258X |
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