Three-dimensional soft tissue effects of mandibular midline distraction and surgically assisted rapid maxillary expansion: an automatic stereophotogrammetry landmarking analysis

2019 ◽  
Vol 48 (5) ◽  
pp. 629-634
Author(s):  
A. Gül ◽  
M.A. de Jong ◽  
J.P. de Gijt ◽  
E.B. Wolvius ◽  
M. Kayser ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Three Dimensional ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Tissue Effects

scholarly journals Three-dimensional soft tissue evaluation after rapid maxillary expansion and mandibular midline distraction osteogenesis

2021 ◽  
Author(s):  
Seyit Ahmet Öztürk ◽  
Sıddık Malkoç ◽  
Ümit Yolcu ◽  
Zehra İleri ◽  
Özge Çelik Güler
Keyword(s):  
Soft Tissue ◽  
Distraction Osteogenesis ◽  
Soft Tissues ◽  
Three Dimensional ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Facial Soft Tissue ◽  
Lower Lip ◽  
Soft Tissue Profile ◽  
Dependent Samples

ABSTRACT Objectives To evaluate the effects of rapid maxillary expansion (RME) and mandibular midline distraction osteogenesis (MMDO) on facial soft tissues using three-dimensional (3D) images. Materials and Methods A total of 20 patients (average age 15.86 ± 2.17 years) were treated with RME and MMDO using tooth-borne distractors. Three-dimensional photographs of each patient were taken with a stereophotogrammetry system at baseline (T0), at the end of the distraction period (T1), and at the end of the consolidation period (T2). All data were analyzed using a dependent-samples t-test at a significance level of 5%. Results Total and lower face height increased after MMDO (P < .05). Nasal and mouth width increased after RME as compared with baseline (P < .05). The labiomental angle increased at T1 and decreased at T2 (P < .05). After MMDO, the convexity angle increased while the mandibular angle decreased (P < .05). Upper and lower lip angles increased after RME (P < .05). The distance from the lower lip to the E plane increased after MMDO and decreased after RME (P < .05). Conclusions The MMDO and RME procedures provide an efficient nonextraction treatment alternative for transverse maxillomandibular deficiency. MMDO may improve the facial soft tissue profile in the transverse and vertical axis of the mandibular region.

scholarly journals Comparison of Tooth- and Bone-Borne Appliances on the Stress Distributions and Displacement Patterns in the Facial Skeleton in Surgically Assisted Rapid Maxillary Expansion—A Finite Element Analysis (FEA) Study

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1152
Author(s):  
Rafał Nowak ◽  
Anna Olejnik ◽  
Hanna Gerber ◽  
Roman Frątczak ◽  
Ewa Zawiślak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Rapid Maxillary Expansion ◽  
Stress Distributions ◽  
Maxillary Expansion ◽  
Facial Skeleton ◽  
Element Analysis ◽  
Maxillary Constriction

The aim of this study was to compare the reduced stresses according to Huber’s hypothesis and the displacement pattern in the region of the facial skeleton using a tooth- or bone-borne appliance in surgically assisted rapid maxillary expansion (SARME). In the current literature, the lack of updated reports about biomechanical effects in bone-borne appliances used in SARME is noticeable. Finite element analysis (FEA) was used for this study. Six facial skeleton models were created, five with various variants of osteotomy and one without osteotomy. Two different appliances for maxillary expansion were used for each model. The three-dimensional (3D) model of the facial skeleton was created on the basis of spiral computed tomography (CT) scans of a 32-year-old patient with maxillary constriction. The finite element model was built using ANSYS 15.0 software, in which the computations were carried out. Stress distributions and displacement values along the 3D axes were found for each osteotomy variant with the expansion of the tooth- and the bone-borne devices at a level of 0.5 mm. The investigation showed that in the case of a full osteotomy of the maxilla, as described by Bell and Epker in 1976, the method of fixing the appliance for maxillary expansion had no impact on the distribution of the reduced stresses according to Huber’s hypothesis in the facial skeleton. In the case of the bone-borne appliance, the load on the teeth, which may lead to periodontal and orthodontic complications, was eliminated. In the case of a full osteotomy of the maxilla, displacements in the buccolingual direction for all the variables of the bone-borne appliance were slightly bigger than for the tooth-borne appliance.

Evaluation of Sagittal and Vertical Changes in Maxillary Dental, Skeletal, and Soft Tissue Following Surgically Assisted Rapid Maxillary Expansion

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Vivian Farfel ◽  
Gladys Cristina Morea ◽  
Lydia Masako Ferreira ◽  
Max Domingues Pereira
Keyword(s):  
Soft Tissue ◽  
Rapid Maxillary Expansion ◽  
Maxillary Expansion ◽  
Vertical Changes

scholarly journals Effects of Rapid Maxillary Expansion and Facemask Therapy on the Soft Tissue Profiles of Class III Patients at Different Growth Stages

2019 ◽  
Vol 13 (02) ◽  
pp. 143-149
Author(s):  
Fatma Selen Ozzeybek Can ◽  
Hakan Turkkahraman
Keyword(s):  
Soft Tissue ◽  
Repeated Measures ◽  
Treatment Options ◽  
Rapid Maxillary Expansion ◽  
Growth Stages ◽  
Class Iii ◽  
Maxillary Expansion ◽  
Treatment Groups ◽  
Facial Changes ◽  
Different Growth Stages

Abstract Objectives The aim of this study was to evaluate the effects of rapid maxillary expansion (RME) and facemask therapy on the soft tissue profiles of class III patients at different growth stages. Materials and Methods Forty-five subjects (23 females and 22 males) were divided into prepubertal, pubertal, and postpubertal groups. Bonded type RME appliances and Petit-type facemasks were fitted to each patient, and intraoral elastics were applied from the hooks of the RME appliance to the facemask. Statistical Analysis All measurements were statistically analyzed with SPSS version 18.0 (SPSS Inc., Chicago, IL, United States) for Windows. Repeated-measures of ANOVA and posthoc Tukey tests were used to compare the groups. Results The soft tissue nasion, pronasale, subnasale, soft tissue A point, and labrale superior landmarks were all displaced forward and downward, and the most dramatic changes were recorded in the pubertal group. The labrale inferior, soft tissue B point, soft tissue pogonion, and soft tissue menton landmarks moved backward and downward in all groups, and the greatest displacements were observed in the pubertal group. Conclusions The soft tissue profiles improved significantly and became more convex in all treatment groups. Although, the most favorable facial changes were observed in the pubertal growth stage, the treatments applied in the postpubertal stage also elicited significant changes and should thus be considered viable treatment options.

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