Stress Pattern and Deformation in Mid-palatal Suture and Posterior Dentoalveolar Area With Two Different Types of Rapid Maxillary Expansion Appliances: A Finite Element Method Study

Abstract

Objective: The study was conducted to evaluate stress pattern and deformation in mid-palatal suture and posterior dentoalveolar area during maxillary expansion therapy with two different types of rapid maxillary expansion by finite element method study. Methods and Methodology: The finite element analysis was performed on a model of maxilla, with narrow maxillary base and teeth digitally reconstructed, based on CBCT images, acquired by child (age 12.5 years) but not in permanent dentition stage from available pool data. Result: More amount of stress was observed in mid-palatal suture and posterior dental alveolar area by using the Hyrax appliance as compared to the Haas appliance. Stress pattern evaluated in mid-palatal suture depicts maximum stress concentration on the anterior region of mid-palatal suture at the position of incisive papilla. Deformation in maximum quantity is observed in central incisors. Maximum stress generation and deformation are observed in lingual region of premolar and molar areas. Minimum stress generation and deformation are observed in the posterior part of last molars. Conclusion: Hyrax produces more stress and deformation in mid-palatal suture as well as in the posterior alveolar segment in comparison to Haas appliance. Better results in the immediate skeletal response were obtained by the Hyrax-type expander as compared to the Haas type.

Comparison of the effects of different rapid maxillary expansion techniques on craniofacial structures: a finite element analysis study

“…Additionally, there were significant differences for all expansion modalities in terms of the amounts of stress accumulation between the anterior part and the posterior part of the midpalatal suture in the bone-borne group compared to the other groups. The midpalatal suture ossification process proceeds from the posterior part of the suture to its anterior part [ 2 ]. Therefore, this difference in the bone-borne group can be explained by the fact that transverse forces are transmitted directly to the basal bone, overcoming the resistance of the anterior midpalatal suture, and resulting in higher stress accumulation in the posterior midpalatal and circummaxillary sutures (Figs.…”

“…The midpalatal suture begins to obliterate during the juvenile period, and the ossification of both the midpalatal suture and circummaxillary sutures increases with age [ 2 ]. The increase in the degree of suture fusion makes it difficult to expand the maxilla in patients with transverse maxillary deficiency.…”

Finite Element Analysis of Mandibular Advancement Comparing Hunsuck/Epker and a Novel Modification of the Low Z Plasty Technique of BSSO

“…To determine the post-surgical condition, biomechanical behavior should be evaluated [9]. Instead of in vitro measurements of mandibular specimens, finite element analysis (FEA) was the engineering method that was used to solve dental complex situations in [20]. The accuracy of FEA for describing biomechanical behavior has been reported in many publications [20,21].…”

“…Instead of in vitro measurements of mandibular specimens, finite element analysis (FEA) was the engineering method that was used to solve dental complex situations in [20]. The accuracy of FEA for describing biomechanical behavior has been reported in many publications [20,21]. These have discovered a strong relationship between experimental research and FEA simulation [9,22].…”