TREATMENT TIMES FOR 3 DIFFERENT TYPES OF VENEER RESTORATIONS

In a longitudinal clinical trial the treatment times needed for the fa brication of veneer restorations (VRs) were recorded and analysed. Tre atment times were determined for: (1) direct resin composite (DC),(2) indirect resin composite (IC) and (3) porcelain (P) veneer restoration s and for two preparation designs, with and without incisal coverage. Significant effects on the treatment times were found for the factors: (1) type of VR (2) operator, (3) number of VRs and (4) 'problems' in try-in phase for indirect VRs (IC- and P-VRs). The mean total time nee ded to perform one DC-VR was 46 min with a 95% confidence interval (c. i.) of 40-54 min, for one IC-VR 70 min (c.i. 60-82 min) and for one P- VR 62 min (c.i. 53-71 min). In the cases where more than one VRs were placed in one patient the times per VR were respectively: DC, 38 min ( c.i. 34-44 min); IC, 59 min (c.i. 52-67 min); P, 49 min (c.i. 44-55 mi n). The results of this study are considered to be useful in further c ost-benefit analyses.