Analysis of the Morphological Characteristics of the Palatal Rugae for Three-Dimensional Superimposition of Digital Models in Korean Subjects

Table 4

The position of the anterior or posterior limit of 3rd primary ruga according to the presence of additional rugae posterior to the 3rd primary ruga, based on the contact points between the first premolar and the second premolar.

The position of the 3rd primary ruga	Number of ruga = 3			Number of ruga > 3
	Right	Left	Total	Right	Left	Total	P value
Anterior limit of the 3rd ruga
Anterior	39 (57%)	35 (40%)	74 (48%)	212 (88%)	171 (80%)	383 (84%)	< 0.001
Posterior	29 (43%)	51 (60%)	80 (52%)	30 (12%)	43 (20%)	73 (16%)
Posterior limit of the 3rd ruga
Anterior	1 (1%)	2 (2%)	3 (2%)	60 (25%)	52 (24%)	112 (25%)	< 0.001
Posterior	67 (99%)	84 (98%)	151 (98%)	182 (75%)	162 (76%)	344 (75%)
Total	68	86	154	242	214	456

Anterior: anterior to the contact points between the first premolar and the second premolar; Posterior: posterior to the contact points between the first premolar and the second premolar.