| Autor: |
Sayed ME; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Porwal A; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Hamdi BA; Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Hurubi SY; Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Hakami AK; Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Hakami AJ; Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Dighriri AM; Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Jad YA; Intern, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Alqahtani SM; Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Alsubaiy EF; Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Alfaifi MA; Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Altoman MS; Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Jokhadar HF; Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia., AlResayes SS; Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia. |
| Abstrakt: |
BACKGROUND Several auxiliary features have been proposed to achieve sustainable retention for short-prepared dental crowns; however, achieving retention is challenging. This study aimed to assess the impact of increased total occlusal convergence and auxiliary preparation factors like box and groove on the retention form of short tooth preparations. MATERIAL AND METHODS Eighty resin machine-milled dies with a height of 3 mm and a deep chamfer margin of 1 mm were prepared to mimic the short-prepared molar. Initially, 2 teeth were prepared following the guidelines, and the total occlusal convergence was kept at 10° and 20°, respectively. Auxiliary features such as the proximal box and buccal groove were prepared on separate 20° dies. Eighty dies were prepared with 10 samples each for 10°, 20°, 20° with proximal box and 20° with buccal groove for zirconia (n=40) and metal crowns (n=40). Cementation was done with glass ionomer luting cement, and a pull-off test was conducted. Data were analyzed using one-way analysis of variance and post hoc fisher least significant difference test (P<0.05). RESULTS The highest mean was observed in the proximal box group with the metal crown (14.59), and the lowest in the group with 20° zirconia crowns (9.12). Within groups, the highest retentive values were found for the 20° taper with proximal box preparation; the lowest was for the 20° taper group. CONCLUSIONS Within the study limitations, it could be concluded that incorporating a proximal box or buccal groove in short tooth preparations with an increased total occlusal convergence improved retentive values. |
