Maxillary posterior intrusion with corticotomy-assisted approaches with zygomatic anchorage—a finite element stress analysis

Abstract

Background Anterior open bite is one of the most difficult malocclusions to treat and maintain in orthodontics. An effective treatment approach to correct anterior open bite is the intrusion of maxillary posterior teeth. The aim of this study was to evaluate the effects of corticotomy-assisted posterior maxillary intrusion with zygomatic anchorage by using finite element stress analysis. Methods An acrylic bite block on the posterior teeth including two transpalatal arches were modeled and 1.96 N intrusive force was loaded. Three scenarios were set, first with no subapical corticotomy, second with buccal, and third with both buccal and palatal corticotomies. The stress distributions along the cortical, cancellous bone surfaces, and dental structures were assessed by finite element stress analysis. Results Stress distributions over cortical and cancellous bones were commonly located at the inferior curvature of the zygomatic buttress area and posterior teeth for all scenarios. Stress values above the apices of anchor teeth were decreased for both corticotomy scenarios. Increased stress distributions were observed in cancellous bone around corticotomy regions. Despite the acrylic appliance and transpalatal arches, the stresses along the posterior teeth were not uniform. The apical third of the first molar mesiobuccal apex showed the highest stress values in all scenarios. Conclusions Corticotomy-assistance effected biomechanical responses of dentoalveolar structures during maxillary posterior intrusion. There was no apparent difference for the stress levels of the root apices between corticotomy scenarios, pointing out that only buccal corticotomy may be a better option in corticotomy-assisted maxillary intrusion.

Effect of maxillary molar intrusion on surrounding bone density during treatment of anterior open bite

“…Whereas the outcomes of the study indicated that the alveolar bone density of left first permanent molars had statistically significant decrease (461.02±162.29 HU) and non-significant decrease (59.43±179.72 HU) in the buccal and palatal side, respectively. Table (2,4,6) result, CBCT was utilized to assess bone density in this investigation. In the current study there was no statistical difference in bone density between male and female patients that were allocated.…”

Intrusion of Maxillary Posterior Teeth by Skeletal Anchorage: A Systematic Review and Case Report with Thin Alveolar Biotype

“…Levelling the occlusal plane, including occlusal equilibration, is needed in cases with overerupted upper posterior teeth. This can be accomplished by root canal therapy with dental reshaping and prosthetic treatment [4], or by orthodontic intrusion using skeletal anchorage [5,6], surgical assisted impaction using corticotomy [7], or orthodontic surgery [8], ranging to much more extensive surgery, such as a LeFort I osteotomy with maxillary rotation [9]. A more frequent surgical technique in such cases is represented by the lateral maxillary segmental osteotomy, followed by the apical repositioning of the bone fragment [10].…”

Vertikal çeneliğin mandibular kondil ve ramus üzerindeki biyomekanik etkilerinin ön açık kapanışı olan ve olmayan bireylerde sonlu elemanlar metodu ile incelenmesi

“…Ortodonti literatüründe, sonlu elemanlar stres analizi yöntemiyle elde edilen üç boyutlu araştırma modellerinin oldukça sık kullanıldığı belirlenmiştir. [27][28][29][30][31][32] Aynı zamanda ortodontik ve ortopedik kuvvetlerin dentofasiyal kompleksi oluşturan anatomik yapılar üzerindeki biyomekanik etkileri de bu modeller üzerinde değerlendirilmiştir. [27][28][29]32 Yapılan çalışmalar sonucunda, sonlu elemanlar stres analizi yönteminin ortodonti mekaniklerinin seçiminde kullanılabileceği rapor edilmiştir.…”

“…[27][28][29][30][31][32] Aynı zamanda ortodontik ve ortopedik kuvvetlerin dentofasiyal kompleksi oluşturan anatomik yapılar üzerindeki biyomekanik etkileri de bu modeller üzerinde değerlendirilmiştir. [27][28][29]32 Yapılan çalışmalar sonucunda, sonlu elemanlar stres analizi yönteminin ortodonti mekaniklerinin seçiminde kullanılabileceği rapor edilmiştir. 27,29,30,32 Model I ve Model II'e ait dişlerde saptanmış olan en yüksek stres miktarını mandibular kondil ve ramus bölgesi izlemektedir.…”

“…[27][28][29]32 Yapılan çalışmalar sonucunda, sonlu elemanlar stres analizi yönteminin ortodonti mekaniklerinin seçiminde kullanılabileceği rapor edilmiştir. 27,29,30,32 Model I ve Model II'e ait dişlerde saptanmış olan en yüksek stres miktarını mandibular kondil ve ramus bölgesi izlemektedir. Model I ve Model II'deki mandibular kondil bölgesinde tespit edilen stres miktarı sırasıyla 5.64 MPa, 1.38 MPa'dır.…”