Effect of Social Habits on the Clinical Performance of CAD/CAM Ceramic Prosthesis Fabricated from Different Ceramic Materials: 12-month Follow-up

Aesthetic restorations are fabricated using CAD/CAM technologies utilizing zirconia and lithium disilicate. These materials have shown promising results in terms of clinical performance, but the effects of social habits remain unknown. Therefore, this study aimed to investigate the impact of social habits (khat or smokeless tobacco) on the clinical performance of prostheses constructed from different CAD/CAM prosthetic materials (multilayer zirconia or lithium disilicate) by using the United States Public Health Service (USPHS).

in 2022–2023, sixth-year dental students evaluated 87 multilayer zirconia and lithium disilicate CAD/CAM restorations with modified USPHS criteria and under the direct observation of supervisors. The clinical performance was evaluated at 6 and 12 months of follow-up. The patient’s data included age, CAD/CAM material type, khat chewing, absence of smoking, arch type, side of the face, and tooth position. The statistical significance was set at p ≤ 0.05.

Most of the case scores were clinically excellent (alpha) for both CAD/CAM materials at different recall intervals, but few scores were clinically acceptable (bravo) according to the USPHS criteria within the 12-month period; no charlie or delta value was recorded. The ANOVA and McNemar tests showed no significant differences in USPHS and parameter scores in both follow-up intervals. The color parameters recorded a p-value of 0.063 in the 12-month recall assessments, while marginal adaptation showed a p-value of 0.375 at the final study recall. Patient satisfaction, based on visual analog scale parameters, was very high

The overall USPHS scores were almost excellent in all parameters, and the clinical performance of crowns showed statistically significant differences in social habits in terms of color and retention.