Table 2. The results of the naturalness of fissure morphology and cusp shape and cusp tip position.

Design	Question 1 (Naturalness of fissure morphology)			Question 2 (Naturalness of cusp shape and cusp tip position)
	Postgraduate students (%)	Undergraduate students (%)	Total (%)	Postgraduate students (%)	Undergraduate students (%)	Total (%)
BI	0.0 - 81.0	10.0 - 66.0	7.0 - 70.4	0.0 - 81.0	16.0 - 66.0	11.3 - 70.4
BC	0.0 - 52.4	0.0 - 28.0	0.0 - 35.2	0.0 - 38.1	2.0 - 28.0	1.4 - 26.8
BR	14.3 - 90.5	28.0 - 78.0	25.4 - 81.7	19.0 - 81.0	26.0 - 76.0	25.4 - 76.1