PubMed Health⌕ Search
Home/Archive/PubMed

PubMed · 14606554

Computer simulation system for orthognathic surgery.

N Noguchi·M Goto
View original source ↗Export metadata ↓

Abstract

OBJECTIVE: The system aimed to make a simulation model of an orthognathic patient without using his/her computed tomography data. DESIGN: The morphological data of the teeth and face were obtained by laser scanner. All the data were integrated in the reference coordinate system of frontal and lateral cephalograms using projection matching technique. SETTING: A case of mandibular prognathism was analyzed and presented. EXPERIMENTAL VARIABLE: About 7 mm (left side) to 6 mm (right side) of mandibular setback with a small rotation was performed on this case. RESULTS: Simulated osteotomies and bone movements help us to analyze the movement of bone and soft tissue. Collisions and gaps generated between bone segments and facial changes are shown. CONCLUSION: This simulation system will be particularly useful for the selection of an optimal operative method in cases in which the change in facial soft tissue shape should be carefully deliberated.

Explore related subjects

CephalometryComputer SimulationFaceFacial BonesHumansImage Processing, Computer-AssistedLasersMandibleOrthognathic Surgical ProceduresOsteotomyPatient Care PlanningPrognathismSurgery, Computer-AssistedJournal Article

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

N Noguchi, M Goto. 2003. Computer simulation system for orthognathic surgery.. https://doi.org/10.1034/j.1600-0544.2003.254.x

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2006

Superimposition and projective transformation of 3D object.

Superimposition is an efficient method for evaluation of coincidence between a skull and a photo portrait. The principle of superimposition method lies in the projection of the skull into the face image. During the projection of an object with a perspective camera, the mapping of a three-dimensional object into a two-dimensional image takes place. The acquired images of the same object are more or less distorted due to various photographic conditions, due to extrinsic and intrinsic parameters of the camera. The distortions have important influence onto reliability of human identification by the superimposition method. Mathematically we can describe most of the distortions. On the basis of the description the divergences could be simulated and in some cases eliminated by geometric transformation of the compared images. We are presenting a mathematical model of the standard projective camera and the mathematical description of distortions which are important for the superimposition process. The results show the distortions and the elimination of the distortions by means of the projection model.

Cephalometry↗
PubMed2006

Nasolabial symmetry following Tennison-Randall lip repair: a three-dimensional approach in 10-year-old patients with unilateral clefts of lip, alveolus and palate.

AIM: To assess the degree of facial symmetry in patients suffering from unilateral cleft lip, alveolus and palate (UCLAP) by determining differences between the cleft and the non-cleft hemifaces from 3D surface data. PATIENTS AND METHODS: In twenty-two 10-year-old UCLAP patients, who had the lip repaired using the Tennison-Randall technique and did not undergo further revisional surgery, differences were determined between landmarks, surface areas of the upper lip vermilion and nostrils and virtual volumes of midface, nose and upper lip for cleft and non-cleft sides, separately, after having established a plane of symmetry calculated from optical 3D facial surface data. RESULTS: Statistically significant differences could be found between cleft and non-cleft sides for the nasal landmarks G(lat), G(sup) and La(med), the nostril angle and the virtual volume of the nose (p(Glat)=0.011, p(Gsup)<0.0005, p(Lamed)=0.002, p(nostril angle)=0.036 and p(nose volume)<0.0005, resp.). CONCLUSION: Analysis of 3D data shows that complete nasal symmetry is difficult to achieve with Tennison-Randall's lip repair without revisional surgery. Further trials on larger populations of patients will allow a more comprehensive and consistent analysis of the consequence of different methods for cp repair in order to identify the techniques with the best outcome in terms of facial symmetry.

Cephalometry↗
PubMed2006

Effects of functional orthodontic appliances in the correction of a primary anterior crossbite--changes in craniofacial morphology and tongue position.

Chin caps have been used for the correction of primary anterior crossbites, but previous studies of the treatment effects have highlighted problems such as pressure on the temporomandibular joint (TMJ). Therefore, to reduce pressure on the TMJ, a functional orthodontic appliance, the Yanagisawa Class III (YC3) shield was developed to improve the overjet in the primary dentition. The aim of this study was to determine the treatment effects of the YC3 in correcting a primary anterior crossbite compared with a chin cap. The pre- and post-treatment lateral cephalograms of 10 patients (5 male, 5 females) and 10 treated with a YC3 (5 males, 5 females) were compared in relation to craniofacial morphology and tongue position [the YC3 was used from 51 months of age +/- 7 months to 74 months of age +/- 12 months (i.e. for 23 +/- 9 months) and the chin cap from 53 months of age +/- 2 months to 75 months of age +/- 1 month (i.e. for 22 +/- 5 months)]. A Mann-Whitney U-test was used to determine any statistical differences. The YC3 group showed significantly higher values for gonial angle and U1 to SN (P < 0.05), and significantly lower values for interincisal and tongue position (P < 0.05), compared with the chin cap group. The results indicate that the use of the YC3 not only improves overjet, but also changes the tongue position. The findings also suggest that the YC3 results in functional effects on the skeletal system during the mid-growth period.

Cephalometry↗