Table 2.

The proportion of instruments placed on a tray, but not used during the procedure is a proxy indicator for work complexity and cost.

The complexity of a prosthesis and instrumentation system is an important cost driver as well as a hidden source of failures within the scope of the instrument cycle
Criteria	Standard setting	Size-specific setting	Reduction in complexity (%)
Sample size	14	18	–
Number of instruments prepared	156	91	42.67%
Proportion of instruments used	32.67%	54.64%	40.21%
Number of trays	6	3	50%