ABSTRACT
Objective A database of normal people's external nose was established through 3D measurement. This database was used to customize the external nose for patients with nasal defects and to assist the operator to carry out the whole nose reconstruction surgery, so as to carry out the postoperative evaluation.Methods 3D scanning of the subject's face, measurement of relevant indexes of the nose and establishment of a database, the operator used normal nose database to customize the customized external nose for 17 patients with nasal defects, assisted them in the whole nose reconstruction surgery, and used independent sample t test for data statistics to evaluate the expected effect of surgery. Results There was no statistically significant differences between the postoperative actual data and the preoperative personalized data (P> 0.05) in right root wing distance, left root wing distance, nose length, nasal base width, nose width, right side vertical bisect nasal line, left side vertical bisect nasal line, nose height, medial malleolus spacing, face width, mouth split width, facial height, nasal width index, nasal width index, interondylar-nasal width index and nasal high index. The actual data of nasal deep was statistically different from preoperative personalized data (P < 0.05). Conclusions Analysis showed no significant difference between the actual data nasal surgery and preoperative customization data. 3D measurement of normal human external nasal establishment database to customize the external nose for patients with nasal defects, can assist the surgeon to perform total nasal reconstruction surgery and improve predictability and make surgery more precise. Postoperative assessments can also be performed to compare preoperative and postoperative outcomes.
ABSTRACT
Objective:To provide anatomic image data for ossointegrated implant for patients with nasal defect. Methods: 100 cases of (50 males, 50 females) 3D spiral CT images of normal bone of skull were measured with mimics 10.01 software. Results: The minimum distance between the root tips of central incisor and the anterior nasal floor was 13.03 in males and 11.06 in females. The minimum distance between the root tips of lateral incisor and the anterior nasal floor was 15.95 mm in males and 13.04 mm in females, the minimum thickness of palatine process 6mm inferior to piriform aperture was 9.96 mm, the minimum thickness of alveolus 6mm inferior to piriform aperture was 11.57 mm in males and 10.61 mm in females, the thickness of glabella adjoin to frontal sinus was 3.57mm. Conclusion: The lateral incisor region is an optimal one for nasal implants 4-8 mm in length. The inclined direction can either be forward or backward. When the vertical bone depth is not enough, horizontal placement of the implants in the inferior region of piriform should be considered. 4-8 mm implants is suitable in this region. The glabella region is not optimal but an alternative option for nasal implants.
ABSTRACT
To establish systematic diagnosis and treatment planning of dentofacial deformity patient including facial asymmetry or hemifacial microsomia patient, comprehensive analysis of three dimensional structure of the craniofacial skeleton is needed. Even though three dimensional CT has been developed, landmark identification of the CT is still questionable. In recent, a method for correcting cephalic malpositioning that enables accurate superimposition of the landmarks in different stages without using any additional equipment was developed. It became possible to compare the three-dimensional positional change of the maxillomandible without invasive procedure. Based on the principle of the method, a new program was developed for the purpose of diagnosis and treatment planning of dentofacial deformity patient via three dimensional visualization and structural analysis. This program enables us to perform following menu. First, visualization of three dimensional structure of the craniofacial skeleton with wire frame model which was made from the landmarks observed on both lateral and frontal cephalogram. Second, establishment of midsagittal plane of the face three dimensionally, with the concept of "the plane of the best-fit". Third, examination of the degree of deviation and direction of deformity of structure to the reference plane for the purpose of establishing surgical planning. Fourth, simulation of expected postoperative result by various image operation such as mirroring, overlapping.