Biomechanical Effects of Rapid Palatal Expansion on the Craniofacial Skeleton with Cleft Palate: A Three-Dimensional Finite Element Analysis

2007 ◽  
Vol 44 (2) ◽  
pp. 149-154 ◽  
Author(s):  
Xiaogang Pan ◽  
Yufen Qian ◽  
Jia Yu ◽  
Dongmei Wang ◽  
Yousheng Tang ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Cleft Palate ◽  
Nasal Cavity ◽  
Cleft Lip And Palate ◽  
Three Dimensional ◽  
Dental Arch ◽  
Craniofacial Skeleton ◽  
Palatal Expansion ◽  
Rapid Palatal Expansion

Objective: To explore the biomechanical effects of rapid palatal expansion (RPE) on the craniofacial skeleton with cleft palate. Design: A finite element model of a patient's skull with cleft lip and palate (CLP) was generated using data from spiral computed tomographic (CT) scans. Finite elemental analysis (FEA) was performed to depict the physiological changes and stress distribution in craniofacial structures loaded with orthopedic forces that created 5 mm of displacement on the region of the maxillary first premolar and first molar crown. Patients, participants: A 14-year-old girl with left complete unilateral CLP was included in this study. Interventions: Spiral CT was carried out prior to any treatment. Main outcome measure(s): Three-dimensional (3D) features of displacement and stress distribution were analyzed following application of transverse orthopedic force. Results: Marked amount of displacement and deformation occurred in the dental region. Asymmetric displacement and deformation of UCLP under RPE were evident. The stress generated by RPE was dispersed around the cleft palate and nasal cavity, and was distributed at the buttress of the maxilla-inferior border of the nasal cavity, outboard of the orbit, and central frontal bone near the nasion. Conclusions: Application of RPE to UCLP patients induces a pyramid-like displacement of the nasomaxillary complex along with fan-like expansion of the upper dental arch. The uniqueness of RPE with UCLP, however, lies in the asymmetric expansion and dispersed stress distribution around the lateral maxilla buttress and outboard of orbit.

Effects of Cleft Type, Facemask Anchorage Method, and Alveolar Bone Graft on Maxillary Protraction: A Three-Dimensional Finite Element Analysis

2012 ◽  
Vol 49 (2) ◽  
pp. 221-229 ◽  
Author(s):  
Ii-Hyung Yang ◽  
Young-Ii Chang ◽  
Tae-Woo Kim ◽  
Sug-Joon Ahn ◽  
Won-Hee Lim ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Bone Graft ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Alveolar Bone ◽  
Three Dimensional ◽  
Bilateral Cleft Lip ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Objective To investigate biomechanical effects of cleft type (unilateral/bilateral cleft lip and palate), facemask anchorage method (tooth-borne and miniplate anchorage), and alveolar bone graft on maxillary protraction. Design Three-dimensional finite element analysis with application of orthopedic force (30° downward and forward to the occlusal plane, 500 g per side). Model Computed tomography data from a 13.5-year-old girl with maxillary hypoplasia. Intervention Eight three-dimensional finite element models were fabricated according to cleft type, facemask anchorage method, and alveolar bone graft. Main Outcome Measure(s) Initial stress distribution and displacement after force application were analyzed. Results Unilateral cleft lip and palate showed an asymmetric pattern in stress distribution and displacement before alveolar bone graft and demonstrated a symmetric pattern after alveolar bone graft. However, bilateral cleft lip and palate showed symmetric patterns in stress distribution and displacement before and after alveolar bone graft. In both cleft types, the graft extended the stress distribution area laterally beyond the infraorbital foramen. For both unilateral and bilateral cleft lip and palate, a facemask with a tooth-borne anchorage showed a dentoalveolar effect with prominent stress distribution and displacement on the upper canine point. In contrast, a facemask with miniplate anchorage exhibited an orthopedic effect with more favorable stress distribution and displacement on the middle maxilla point. In addition, the facemask with a miniplate anchorage showed a larger stress distribution area and suturai stress values than did the facemask with a tooth-borne anchorage. The pterygopalatine and zygomatico-maxillary sutures showed the largest suturai stress values with a facemask with a miniplate anchorage and after alveolar bone grafting, respectively. Conclusion In this three-dimensional finite element analysis, it would be more advantageous to perform maxillary protraction using a facemask with a miniplate anchorage than a facemask with a tooth-borne anchorage and after alveolar bone graft rather than before alveolar bone graft, regardless of cleft type.

Finite element analysis of stress distribution in anchor teeth in surgically assisted rapid palatal expansion

2013 ◽  
Vol 42 (9) ◽  
pp. 1093-1099 ◽  
Author(s):  
D.S.F.R. de Assis ◽  
T.A. Xavier ◽  
P.Y. Noritomi ◽  
A.G.B. Gonçales ◽  
O. Ferreira ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Element Analysis ◽  
Palatal Expansion ◽  
Rapid Palatal Expansion

scholarly journals Three-Dimensional Finite Element Analysis of Stress Distribution in a Tooth Restored with Full Coverage Machined Polymer Crown

2021 ◽  
Vol 11 (3) ◽  
pp. 1220
Author(s):  
Azeem Ul Yaqin Syed ◽  
Dinesh Rokaya ◽  
Shirin Shahrbaf ◽  
Nicolas Martin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Intraoral Scanner ◽  
Element Analysis ◽  
Dental Ceramic ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Ceramic Crown

The effect of a restored machined hybrid dental ceramic crown–tooth complex is not well understood. This study was conducted to determine the effect of the stress state of the machined hybrid dental ceramic crown using three-dimensional finite element analysis. Human premolars were prepared to receive full coverage crowns and restored with machined hybrid dental ceramic crowns using the resin cement. Then, the teeth were digitized using micro-computed tomography and the teeth were scanned with an optical intraoral scanner using an intraoral scanner. Three-dimensional digital models were generated using an interactive image processing software for the restored tooth complex. The generated models were imported into a finite element analysis software with all degrees of freedom concentrated on the outer surface of the root of the crown–tooth complex. To simulate average occlusal load subjected on a premolar a total load of 300 N was applied, 150 N at a buccal incline of the palatal cusp, and palatal incline of the buccal cusp. The von Mises stresses were calculated for the crown–tooth complex under simulated load application was determined. Three-dimensional finite element analysis showed that the stress distribution was more in the dentine and least in the cement. For the cement layer, the stresses were more concentrated on the buccal cusp tip. In dentine, stress was more on the cusp tips and coronal 1/3 of the root surface. The conventional crown preparation is a suitable option for machined polymer crowns with less stress distribution within the crown–tooth complex and can be a good aesthetic replacement in the posterior region. Enamic crowns are a good viable option in the posterior region.

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