| Autor: |
Sayed ME; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Lunkad H; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Mohana EJ; Intern Clinic, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Mesawa SA; Intern Clinic, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Dowairi FI; Intern Clinic, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Alharbi EAA; Intern Clinic, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Hakami HA; Undergraduate Student, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Jokhadar HF; Department of Oral and Maxillofacial Prosthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia., Alqahtani NM; Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Alshehri AH; Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Alsubaiy EF; Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Alqahtani SM; Department of Prosthodontics, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Mohsen NM; General Dentist, Private Clinic, Jeddah, Saudi Arabia., Al Wadei MHD; Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Mattoo K; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia. |
| Abstrakt: |
BACKGROUND Before insertion, chairside adjustment kits are heat sterilized for positioning and polishing dental restorations. This study aimed to evaluate the effects of 2 steam sterilization cycles on the efficacy of polishing highly translucent monolithic zirconia (HTMLZ) dental restoration material. MATERIAL AND METHODS 100 HTMLZ disc-shaped specimens were adjusted (grinding, finishing, polishing) with EVE Diacera kit. Two steam sterilization techniques [standard (Gp S), immediate/flash (Gp (F)] of CAK were further subgrouped based on number of sterilization cycles [cycle 1 (control), cycle 5, 10, 15, and 20 (experimental)] (n=10 each). Each subgroup accordingly was evaluated for average surface roughness (Ra) and root mean square roughness (Rq) using a profilometer. Mean and standard deviation of 5 subgroups were statistically analyzed using one-way ANOVA/post hoc Tukey's test. Scanning electron microscopy complemented Ra, Rq measurements. Statistical differences of P≤0.05 were considered significant. RESULTS HTMLZ specimens in both groups showed increased (Ra/Rq) values after repeated sterilization of EVE Diacera kit, with Gp F showing lesser increase than Gp S (20 cycles). Gp F at 10 cycles and Gp S at 15 cycles showed clinically unacceptable roughness threshold (0.25 μm). Differences between subgroups for Ra and Rq values were significant (P≤0.05) with less differences within groups observed in early cycles (1, 10). Results validate the manufacturer's recommendations of using flash sterilization/10 cycles for EVE Diacera kit. CONCLUSIONS Repeated sterilization reduces efficacy of chairside adjustment kit to produce smooth surfaces on HTMLZ. This study recommends flash sterilization to a maximum of 10 times to get the clinically acceptable results of Ra and Rq. |
