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Time-and-motion study on class II copy-milled ceramic inlays.

C M Kreulen1, H Moscovich, K A Dansen

  • 1Department of Occlusal Reconstruction and Oral Function, College of Dental Science, University of Nijmegen, The Netherlands. c.kruelen@dent.kun.nl

Journal of Dentistry
|June 17, 2000
PubMed
Summary

This study estimated working times for Class II copy-milled ceramic inlays, finding approximately 125 minutes total. Factors like cavity preparation and dentist experience significantly influenced chair time, with efficiency improving over time.

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Area of Science:

  • Dental materials science
  • Clinical dentistry
  • Biomaterials engineering

Background:

  • Ceramic inlays offer a conservative alternative to amalgam restorations.
  • Copy-milling technology enables precise fabrication of indirect restorations.
  • Understanding working times is crucial for assessing the clinical efficiency of ceramic inlays.

Purpose of the Study:

  • To estimate the total working time for Class II copy-milled ceramic inlays.
  • To identify factors influencing the clinical and laboratory working times.
  • To evaluate the efficiency of ceramic inlay placement.

Main Methods:

  • A controlled clinical trial involving 173 ceramic inlays (Celay system) placed in 101 patients by seven dentists.
  • Net working times for both clinical treatment and laboratory stages were recorded.

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  • Analysis of variance (ANOVA) was used to assess the influence of variables on working time.

    • Main Results:

    • The mean clinical treatment time was 67 minutes, and the laboratory stage averaged 60 minutes.
    • Cavity modification technique, operator, and restoration size significantly impacted clinical working time (p<0.001).
    • Dentists demonstrated a 25% improvement in working time by the study's conclusion.

    Conclusions:

    • Class II copy-milled ceramic inlays require approximately 125 minutes of total working time.
    • Composite basing and larger restorations increased working time.
    • Operator experience and learning curve significantly affected efficiency, with dentists requiring more lab time than technicians.