| Autor: |
Adawi H; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Reddy KN; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Mattoo K; Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia., Najmi N; General Dentists, Jazi Dental Clinics, Jazan, Saudi Arabia., Arishi M; Resident (Prosthodontics), Armed Forces Hospital (Southern Region), Khamis Mushit, Saudi Arabia., Ageeli A; General Dentists, RAM Dental Clinics, Al-Jubail, Saudi Arabia., Bahri A; Resident, Saudi Board (Restorative Dentistry), Jazan Dental Centre, Jazan Health Cluster, Jazan, Saudi Arabia., Khateeb SU; Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Sainudeen S; Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Baba SM; Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Hamid MMM; Department of Oral and Maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Shah SJ; Department of Oral and maxillofacial Surgery, College of Dentistry, King Khalid University, Abha, Saudi Arabia., Jeri SY; Department of Orthodontics, Laseran Medical Clinics, Abha, Saudi Arabia. |
| Abstrakt: |
BACKGROUND This study investigates the effect of artificial aging of direct resin nanohybrid composites on mean bond strength values for veneer ceramic samples. MATERIAL AND METHODS Ninety direct nanohybrid composite resin (Tetric N-Ceram) cylindrical discs were divided into 5 groups (n=18 each) based on aging cycles (thermocycling), as follows: TC=no aging (control), T1=850, T3=2500, T6=5000, and T12=10000 cycles, representing 1, 3, 6, and 12 months of clinical usage, respectively. Lithium disilicate glass ceramic (IPS e.max Press) cylindrical discs were cemented to resin discs using resin cement (Variolink N) after surface treatments (ceramic etching, silaning, composite abrasion). Differences in means between subgroups were calculated using one-way ANOVA, followed by the Tukey honestly significant differences post hoc test. Differences were considered statistically significant with a P value ≤0.05. RESULTS The highest SBS between ceramic and aged composite was observed at 1 month (m=20.35) but did not differ significantly from the control group (m=20.97). For all other subgroups (3, 6, 12 months) SBS was significantly less than that of the control (P≤0.05). At 1 and 3 months, cohesive failures were more common, whereas adhesive failures were more common in 6- and 12-month-old composites. CONCLUSIONS SBS of aged composites was less than that of non-aged composites, with SBS decreasing proportionally as the resin aged. When cementing a ceramic restoration over existing composite restorations, those older than 1 month should be removed and replaced with new ones. |
