The Effect of a Digital Manufacturing Technique, Preparation Taper, and Finish Line Design on the Marginal Fit of Temporary Molar Crowns: An In-Vitro Study
Maryam H. Mugri,
Harisha Dewan,
Mohammed E. Sayed,
Fawzia Ibraheem Shaabi,
Hanan Ibrahim Hakami,
Hossam F. Jokhadar,
Nasser M. Alqahtani,
Ahid Amer Alshahrani,
Abdullah S. Alabdullah,
Abdullah Hasan Alshehri,
Mohammed Hussain Dafer Al Wadei,
Fatimah Yahya Arif,
Ebtihag H. Adawi,
Bandar M. A. Al-Makramani,
Hitesh Chohan
Affiliations
Maryam H. Mugri
Department of Maxillofacial Surgery and Diagnostic Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia
Harisha Dewan
Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia
Mohammed E. Sayed
Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia
Fawzia Ibraheem Shaabi
Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia
Hanan Ibrahim Hakami
Primary Care Administration, Ministry of Health, Jazan 45142, Saudi Arabia
Hossam F. Jokhadar
Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah 21589, Saudi Arabia
Nasser M. Alqahtani
Department of Prosthetic Dental Sciences, College of Dentistry, King Khalid University, Abha 61413, Saudi Arabia
Ahid Amer Alshahrani
Department of Dental Technology, Applied Medical Sciences College, King Khalid University, Abha 61413, Saudi Arabia
Abdullah S. Alabdullah
King Faisal Medical City, Ministry of Health, Abha 62586, Saudi Arabia
Abdullah Hasan Alshehri
Department of Prosthetic Dental Sciences, College of Dentistry, King Khalid University, Abha 61413, Saudi Arabia
Mohammed Hussain Dafer Al Wadei
Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha 61413, Saudi Arabia
Fatimah Yahya Arif
Private Practice, Jazan University, Jazan 45142, Saudi Arabia
Ebtihag H. Adawi
Primary Care Administration, Ministry of Health, Jazan 45142, Saudi Arabia
Bandar M. A. Al-Makramani
Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia
Hitesh Chohan
Department of Restorative Dental Sciences, College of Dentistry, Jazan University, Jazan 45142, Saudi Arabia
The aim of this study is to investigate the combined effect of a digital manufacturing technique (subtractive vs. additive), preparation taper (10° vs. 20° TOC), and finish line (chamfer vs. shoulder) on the marginal adaptation of temporary crowns following cementation with a compatible temporary cement. Four mandibular first molar typodont teeth were prepared for full coverage crowns with standard 4 mm preparation height as follows: 10° TOC with the chamfer finish line, 10° TOC with the shoulder finish line, 20° TOC with the chamfer finish line and 20° TOC with the shoulder finish line. Each of the four preparation designs were subdivided into two subgroups to receive CAD/CAM milled and 3D-printed crowns (n = 10). A total of 80 temporary crowns (40 CAD/CAM milled and 40 3D-printed) were cemented to their respective die using clear temporary recement in the standard cementation technique. The samples were examined under a stereomicroscope at ×100 magnification following calibration. Linear measurements were performed at seven equidistant points on each axial surface and five equidistant points on each proximal surface. One-way ANOVA analysis and Tukey HSD (Honestly Significance Difference) were performed. The best marginal fit was seen in group 8, while the poorest fit was noted in group 2. Shoulder finish lines and 10° TOC resulted in higher marginal gaps, especially in CAD/CAM milled group. The selection of 3D-printed crowns may provide a better marginal fit within the range of clinical acceptability. Marginal gaps were within clinical acceptability (50 and 120 µm) in all groups except group 2.
