Objectives To evaluate the clinical performance and the effect of various patient and provider‐related factors on the longevity of chairside monolithic posterior lithium disilicate glass‐ceramic (LDGC) computer‐aided design (CAD)‐computer‐aided manufacturing (CAM) crowns provided by predoctoral students. Materials and Methods A sample of posterior LDGC CAD‐CAM crowns was evaluated. Crown preparations were milled chairside using the CEREC Omnicam system and cemented with Rely‐X Unicem or Calibra Universal resin cements. Clinical assessment of the crowns and supporting periodontal structures was performed using the modified California Dental Association (CDA) criteria. Intraoral photographs as well as radiographs were taken for further assessment by two evaluators. Kaplan‐Meier survival analysis was performed. Results A total of 40 crowns were inserted in 32 patients and evaluated for 4 years. Three complications were observed (two‐technical and one‐biological). No chipping or fracture of crowns was observed. No significant association was found between age, sex, periodontal condition, tooth type, tooth vitality, cement type, and longevity. The 4‐year cumulative survival and success rates were 95.0 and 92.3%, respectively. Conclusion Chairside LDGC CAD‐CAM crowns exhibited a high survival rate after 4 years in function and were shown to be a viable and reliable treatment option for posterior teeth. Clinical significance The high survival rate of chairside CAD‐CAM crowns observed in this study suggests the likelihood of predictable performance in the predoctoral setup.

No abstract

No abstract

The aims of this study were to determine the convergence angles of posterior teeth prepared by dental students at the retention rate. A total of 280 preparations for posterior monolithic LDGC CAD/CAM crowns were performed on 270 patients (169 women and 101 men). Crowns were cemented with RelyX Unicem and Calibra Universal resin cements. Mesial, distal, and angle of convergence were measured on the bitewing radiographs. Cemented crowns were followed for up to six years. Data were analyzed for tooth type and location and for operator experience. The results showed the majority of convergence angles were greater than the recommended guidelines but fell within a clinically acceptable range (20 to 24 degrees). However, angles of convergence for mandibular molar preparations were highest (28.06±5.50 degrees), while maxillary premolars exhibited the low-

No abstract