Alteration of Occlusal Plane in Orthognathic Surgery: Clinical Features to Help Treatment Planning on Class III Patients

Table 1

Comparison of clinical features and cephalometric measures between patients I and II.

(a)

Quantitative and qualitative data from facial analysis
Patient	Patient I; Figures 1(a)–1(g)	Patient II; Figures 2(a)–2(g)
Facial type; (OP type)	Brachycephalic; (low OP)	Dolichocephalic; (high OP)
Upper incisor at rest	0 mm	7 mm
Dental and gingival display on the smile (mm)	Vertical maxillary deficiency 7 mm e 0 mm	Vertical maxillary excess 13 mm e 3 mm
Maxillary dental midline to the midsagittal plane	Dental midline shifted to the left	Dental midline to the right
Paranasal fullness	Paranasal fullness little decreased	Paranasal fullness decreased
Upper lip support; (Nasolabial angle)	Good upper lip support; (normal)	Lack of upper lip support; (obtuse)
Display among soft tissue of lips and chin	Chin forward of upper and lower lips	Lower lip forward upper lip and chin
Malocclusion; Reverse overjet/overbite (mm)	Class III; −3 mm/0 mm	Class III; −9 mm/0 mm

(b)

Lateral cephalometric
Skeletal sagittal relationship	Preoperative measurements
	Patient I	Patient II	Range reference
SNA Angle	92.4°	75.5°	83.9° (±3.2°)
SNB Angle	94.3°	78.4°	81° (±3°)
ANB Angle	−2°	−2.9°	2° (±2°)
Point A to NPerp line	11.2 mm	−1.5 mm	1.1 mm (±2.7)
Pogonion to NPerp line	26.2 mm	4.2 mm	−0.3 mm (±3.8)
Mandible plane angle	18.4°	32.5°	21.3° (±3.9°)
Facial axis angle	10.8°	−1.9°	0.5 (±3.5°)
Maxilla incisor to point A	10.6 mm	3.4 mm	5.3 mm (±2)
Mandibular incisor to A-pogonion	8.7 mm	6.7 mm	2.3 mm (±2.1)

mm: millimeters; Nperp line: N perpendicular line.