Design of Unilateral Complete Presurgical Nasoalveolar Molding (PNAM) Corrector Based on Feature Points Extraction of Complex 3D Surface

Cleft lip and palate is a congenital maxillofacial deformity. Unilateral complete cleft one of the most common clinical types. Nasal alveolar molding (PNAM) recognized strategy for treatment palate. However, current design PNAM devices mainly relies on subjective experience doctors. The purpose this paper to describe manufacture new computer-aided appliance, which can be applied presurgical nasoalveolar unilateral palate, eliminate individual differences, improve production efficiency. In paper, seven feature points healthy side affected are extracted by method Gaussian curvature ridge line extraction, rotation built-in model designed using these points, quickly generate eight stages PNAM. correction effects appliance in were compared with original maxillary (hand-made experience) from aspects fissure width symmetry. effectively symmetry patients (morphological similarity: t = 3.250, p ≤ 0.01; length 1.559, 0.150) reduce (t 8.330, < 0.01). This fully achieve therapeutic effect appliances prepared experienced doctors more efficient. based complex 3D surface point extraction provide basis evaluation model, efficiency problems caused burden