The Vomer Bone Pattern Variations in Dentofacial Discrepancy using three-dimensional Analysis/Uc Boyutlu Analizler Kullanilarak Dentofasiyal Yetersizliginde Vomer Kemik Ornegindeki Varyasyonlar.
In modern Orthognathic assessment, the cartilaginous or bony part of the midface complex is normally determined by accurate evaluation and proper treatment plan. (1)
This controversy in diagnosis and treatment appeared how to treat underdeveloped maxillary region with a dentofacial discrepancy. (2-4) although there are various morphometric evaluation modalities for treatment of the midfacial hypoplasia still continues to present a great challenge. (5)
The vomer bone as one component of septal cartilage (SC) in nasomaxillary complex represents the most common site in the reconstruction surgery because it lies within the surgical field and the relative flatness, thickness, and hardness of the vomer make it need more evaluation. (6)
The vomer is thickest at its posterior alar portion connected to the Perpendicular Plate of Ethmoid (PPE) and the presphenoidal joint and always markedly thicker than the PPE and the septum due to its bilaminar origin. (7, 8) That fact of pattern variations have definite clinical implications. (9)
Many studies have quantified the site, proportion and outline of vomer bone available for grafting in clefts. (10) However, these studies have had several limitations either study of human cadavers or the samples were few in number and age not in adult time. (11-13)
In a radiological evaluation studies, Cone beam computed tomography (CBCT) provide an accurate analysis with an orthographic view but required reconstruction through additional procedures. (14) CBCT imaging demonstrates precise views of skeletal tissues and routinely provides sagittal images have the high quality of resolution used in evaluation by distinguishing the border outline of the bony structure at minimal cost. (15)
This is the first study using 3D vomer bone CBCT analysis to evaluate the vomer bone differences in relation to the dentofacial discrepancy and its implication in Orthodontics and Orthognathic implications. The aim was to clarify the components variations of the vomer bone in different dentofacial patterns in three different type groups. Thereby this study provides the data that will be helpful for the orthodontic and esthetic midfacial surgery.
The study was designed as a retrospective study and was carried out on the patient CBCT records that selected from the archives of the Orthodontics Department/ Faculty of Dentistry ethic committee consent with a protocol number of 2016-32.
When Patients' CBCT records of ninety-six patients were thirty-six of Angle class I (normal) occlusion and sixty of Angle class III malocclusion patients. In total 44 (45.8%) were female and 52 (54.2%) were male. The mean age was 23.23 [+ or -] 3.92 year--old. Patients were divided into three groups:
1. The "type A" of Angle Cl I normal occlusion 37.5% (n = 36) with a maximum interocclusal (ANB) angular relation value above (4[degrees]< ANB >1[degrees]).
2. The "type B" of Angle Cl III malocclusion 18.8% (n = 18) with an edge to edge interocclusal (ANB) angular relation value (1[degrees]< ANB >-1[degrees]).
3. The "type C" of Angle Cl III malocclusion 43.8% (n = 42) with an inverse interocclusal (ANB) angular relation value (< - 1[degrees]).
When the patients' CBCT records were taken, the focal spot diameter was 0.3 mm x. The CBCT device (Iluma Imtec; 3M Company, St Paul, Minn. USA). The minimum voxel size of the tomography device is 0.4 mm, the pixel size is 0.290 mm, and the cross-sectional area is 0.299 mm and the device 120 KVp and 1.0mA current.
The Ninety-six patients' images who were worked on a desktop computer and then a computer software Mimics version 19.0 (Mimics[R], Materialise, Leuven, Belgium) was transferred images module to the Digital Imaging and Communications in Medicine (DICOM) module preparing for the suitable preoperative analysis of modeling for each patient.
Firstly, the threshold of bone scale selected before cropping for skeletal observation representing by the bone Hounsfield Units (HU) was chosen with a minimum limit of (-1024) Hounsfield Units (HU) and a maximum of (1650) HU. The threshold (bone scale threshold) is important to create first separation of the involved anatomical structures landmarks of the vomer bone.
The vomer bone scale was launched by using thresholding between (-1000) to (1000) Hounsfield Units (HU) for better image resolution.
Secondly, the vomer bone anatomical landmarks were determined and the skeletal planes of the vomer bone were measured and outlined by using the cropping and segmentation tools of the Mimics 19.0 version. (Figure. 1 and 2).
The coordination for both horizontal and vertical performed for symmetry purpose preliminary to the vomer bone outline.
Finally, the three dimensional (3D) models of the full head and vomer bone were reconstructed and separated from each other based on splitting mask tool for determination of landmarks and planes of the vomer bone among three different study (A, B and C) groups respectively for each patient's records CBCT. (Figure.3 and 4) (Table. 1)
Statistical analysis of the data was performed using SPSS statistics program for Windows (version 22.0, SPSS, Chicago, IL, USA). The Shapiro-Wilk normality test was applied. Also Statistical Investigations NCSS (Number Cruncher Statistical System) 2007 (Kaysville, Utah, USA) program was used for statistical analysis. Student t-test was used in two group comparisons of the variables that showed normal distribution in comparison of descriptive statistical methods (mean, standard deviation, median, frequency, ratio, minimum, maximum) as well as quantitative data. Mann Whitney U test was used in two group comparisons of non-paired It was used. The Kruskal Wallis test and the Mann Whitney U test were used in the comparison of the three groups with no normal distribution. Spearman's Correlation Analysis was used to evaluate inter-variable relationships. The Fisher-Freeman-Halton Test was used for the comparison of qualitative variables. Significance was assessed at p <0.05.
When the dimensional measurements according to the type of groups were examined. There was no statistically significant difference between the mean ages of cases according to study groups (p> 0.05). Whereas; there was a statistically significant difference between male and female (p<0.01). The incidence of Type C (severe group) in males is significantly higher than females. There were highly significant differences (p<0.01) between all skeletal parameters among different study groups as shown in (Table.2).
Almost of the vomer bone skeletal parameters in relation to the maxilla base plane (ANS-PNS) skeletal parameter were diminished in both mild and severe malocclusion (B and C) groups by values of (44,2[+ or -]-57,41, 33,21[+ or -]60,98) mm respectively. While the vomer perpendicular height (Ala-Bv) parameter were increased inversely proportional. (Table.2)
There were significant differences between the vomer bone length parameter represented by (C-Alp) and the vomer base parameter represented by (C-BV) with the severity of class III malocclusion (Type C) were (p< 0.01) respectively. (Table.2)
A positive correlation was shown also between the vomeral mattress parameter (C-Ala) and anterior dentoalveolar base parameter (A-C) variables (0,504/0,020 *) in severe group (Type C). In contrast, there was no correlation between other vomer bone components. (Table.3)
The dimensional change of 3D reconstruction models of the vomer bone appeared highly significant differences in different groups in relation to the severity of malocclusion by values of (2090,3) [mm.sup.3] that the vomer bone became larger in size in severe group (Type C). (Table.4)
Maxillary orthopedic is an essential topic in the treatment of the malocclusion with surprising concept because of its interrelationships with the various distinct anatomical architectures. (16-18) Last decades, a low-cost CBCT is not worthy used in craniofacial applications (19, 20) but nowadays are widely used for analysis of a broad spectrum of dentofacial discrepancy like midface complex. (21)
Conventional cephalometrics 2D analysis can give a general idea of the problem in most cases. However, unambiguous craniofacial deformities are not clearly diagnosed and treatment planning alone suffices the defects. Especially in Orthognathic surgery planning, the position, size and relationships of craniofacial structures need to be determined more precisely. In order to solve this problem, although many investigators try to make three-dimensional reconstructions based on using two-dimensional posteroanterior and lateral cephalograms, the reproducibility of measurements and sensitization has not been adequately used. (22)
In this study, unlike previous studies that used a 2D conventional cephalometrics alone or CBCT 3D image analysis with misdiagnosed vomer bone.(23) Firstly, the parameter measured by using 2D cephalometrics landmarks and planes determination then after the vomer bone outline observed for the reconstruction of the 3D models without errors using algorithmic tools of Mimics 19.0 version software. Superposition of anatomical structures or different magnifications in different regions, have not been observed frequently in the examining of the skeletal craniofacial structures. By that method facilities, the analyzing of the midface complex revealed a precise image in three dimensional reality.(24) Therefore, before orthodontic and orthognathic surgery procedures; The CBCT analysis can be used to evaluate incoming changes that might be reported with no complication and with steady treatment's outcome later. (25)
When the dimensional changes of skeletal parameters evaluated, the vomer bone components (Length, Mattress, Base and Height) (C-Alp, C-Ala, C-BV and Ala-BV) shown with values (53,81[+ or -]5,90, 42,94[+ or -]5,92, 23,65[+ or -]3,18, and 35,22[+ or -]4,45) respectively highly proportional and significant differences with maxillary length (ANS-PNS) parameters among different study groups. However, The anterior maxilla plane (ANS-
C) and dentoalveolar impaction plane (A-C) parameters increased inversely (14,17[+ or -]3,00), (15,84[+ or -]4,72) when the vomer bone backward displaced and impacted in the sever group malocclusion (Type C).(26)
Thus, a new finding of this study emphasized a strong correlation of the anterior midfacial pattern with vomer bone anterior parameters under the biodynamic effect of the skeletal dimensional changes of the vomer bone. The displacement range of all vomer bone parameters were between (3-5) mm in all planes with near value of ([+ or -]4,72) mm. That results appeared to be parrallel with the Bacilli's study with confidential evidence to the anatomical feature of anterior portion of maxilla segments. (Table 3) (27, 28)
Due to the vomer bone morphology of the "Y" shape, the anterior proximal segments has a close relation to the septo-vomeral traction that narrower anterior segment of the medial directional displacement of the maxilla line occurs. These observational findings appeared clearly with highly significant increase and positive correlation in the anterior maxilla region (ANS-PNS), (ANS-C), (A-C) parameters in relation to the full length of vomer bone and its basal plane parameters were diminished in backward displacements toward the severity of malocclusion. (29) (Table.2) (Table.3)
On the other hand, the interesting interrelations of the vomer bone with midfacial architecture using 3D CBCT analysis not reveal accurately previously. In this study, the application of the possibility of creating 3D reconstruction model of the full skull and vomer bone models provide the opportunity to analyze the vomer bone with great accuracy and reproducibility. The analysis of this study 3D models were developed by defining landmarks and planes initially then converted from 2D to 3D masks for accurate finding analysis. As a result the vomer bone seemed to be significantly larger in relation to the increase of severity among different study groups. (30)
That vomer bone components analysis were reported with a meaningful limitation of this study retrospectively and less sample account. However, that study fact have an important orthodontic and surgical implementation because the pattern of anomalies and facial disharmony appeared almost varied between individuals even though a little dentofacial difference may be seen between each others.
According to the findings of this study, the dimensional change and 3D pattern variations of vomer bone were shown to be highly significant and correlated with a meaningful displacement to the skeletal dentofacial discrepancy by using 3D CBCT image analysis.
Under the limits of this study it can be concluded that: Three-dimensional analysis of the vomer bone segments provide the clear evidence of the midface pattern discrepancy with malocclusion. To create an ideal treatment plan the morphometric analysis for malocclusion with different dentofacial pattern should be evaluated. In order to evaluate a more reliable relationship of vomer bone with midface hypoplasia and dentofacial pattern discrepancy, further studies are still needed to be conducted. Ethics Committee Approval: This study was approved by Clinical Researchs Ethic Comittee of Marmara University, Faculty of Dentistry.
Informed Consent: Written informed consent was obtained from patients who participated in this study.
Peer-review: Externally peer-reviewed.
Author contributions: Concept - A.M., K.B., S.E.Y; Design - A.M., K.B., S.E.Y; Supervision A.M., K.B., S.E.Y; Materials--A.M., K.B., S.E.Y; Data Collection and/or Processing - A.M., K.B., S.E.Y; Analysis and/or Interpretation - A.M., K.B., S.E.Y; Literature Search A.M., S.E.Y; Writing A.M., K.B., S.E.Y; Critical Reviews - A.M., K.B., S.EY.
Conflict of Interest: The authors have no conflict of interest to declare.
Financial Disclosure: The authors declared that this study has received no financial support.
Etik Komite Onayi: Bu calisma Marmara Universitesi Dis hekimligi Fakultesi Klinik Arastirmalar Etik Kurulu tarafindan onaylanmistir.
Hasta Onami: Bu calismaya katilan hastalardan yazili onam formu alinmistir.
Hakem Degerlendirmesi: Dis Bagimsiz.
Yazar Katkilari: Fikir--A.M., K.B., S.E.Y; Tasarim A.M., K.B., S.E.Y; Denetleme - A.M., K.B., S.E.Y; Kaynaklar--A.M., K.B., S.E.Y; Malzemeler--A.M., K.B., .E.Y; Veri Toplanmasi ve/veya ilemesi A.M., K.B., S.E.Y; Analiz ve/veya Yorum--A.M., K.B., S.E.Y; Literatur taramasi - A.M., S.E.Y; Yaziyi Yazan - A.M., K.B., S.E.Y; Elestirel Inceleme - A.M., K.B., S.EY.
Cikar Catismasi: Yazarlar cikar catismasi bildirmemislerdir
Finansal Destek: Yazarlar bu calisma icin finansal destek almadiklarini beyan etmislerdir.
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Ammar Mohi (1), Kadir Beycan (2), Sebnem Yalcinkaya (3)
(1) Specialist Dentist, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Baghdad University, Baghdad, Iraq.
(2) Assistant professor, Department of Orthodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
(3) Professor, Chairman and Head of Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
ORCID IDw of the authors: A.M. 0000-0003-1394-5743
Correspondence Author/Sorumlu Yazar: Ammar Mohi E-mail/E-posta: email@example.com
Table. 1 The Study Skeletal Landmarks Landmark Definition Nasion (N) The junction between the nasal and frontonasal sutures Sella (S) The center of the Sella turcica on the midsagittal plane Basion (Ba) The most anterior curve of foramen magnum Anterior nasal spine The most anterior point on the floor of nose (ANS) Orbitale Right The most inferolateral point of Right inferior (OoR) orbital margin Orbitale Right (OoL) The most inferolateral point of Left inferior orbital margin Posterior nasal The most posterior point on the floor of nose spine (PNS) A point (A) The deepest point between ANS and prosthion at the midsagittal plane of upper alveolus of upper incisors B point (B) The deepest point between pogonion and the alveolus of the lower incisors on the midsagittal plane Vomer apex (C) The most anterior and medial point at upmost opening of nasopalatine canal corresponding to canine eminence point CE bilaterally The most posterior and medial point of maxilla Vomer base( BV) at lowermost opening of sphenopalatine fissure opening corresponding to point PNS medially Vomer ala anterior The most superior and medial point at uppermost (Ala) level of anterior sphenoid body. Vomer ala posterior The most posterior and medial point at lowermost (Alp) level of anterior sphenoid body. Table.2 The Dimensional Analysis of Study Groups Cranial Type A (n=18) B (n=9) ANS - Min-Max (Median) 45,42-58,79 (54,3) 43,88-50,26 (46,2) PNS Mean[+ or -]SDs 53,17[+ or -]4,41 46,15[+ or -]1,89 Midfacial C-ANS Min-Max (Median) 7,22-15,6 (11) 9,82-14,12 (13,7) Mean[+ or -]SDs 11,13[+ or -]2,48 12,93[+ or -]1,5 AC Min-Max 6,37-15,11 (10,1) 11,42-14,85 (13,9) (Median) Mean[+ or -]SDs 10,50[+ or -]2,85 13,60[+ or -]1,24 Mean[+ or -]SDs 18,20[+ or -]2,27 15,74[+ or -]1,87 Ala-BV Min-Max (Median) 15,24-27,66 (21,7) 15,31-22,46 (21,8) Mean[+ or -]SDs 21,20[+ or -]3,40 20,73[+ or -]2,41 CBV Min-Max (Median) 34,33-46,03 (41,7) 29,17-37,72 (34,4) Mean[+ or -]SDs 41,27[+ or -]3,54 33,35[+ or -]2,81 C-Alp Min-Max (Median) 52,24-67,54 (60,7) 44,2-57,41 (49) Mean[+ or -]SDs 60,50[+ or -]5,52 50,06[+ or -]4,46 C-Ala Min-Max (Median) 41,23-54,58 (46,4) 33,32-51,33 (42,1) Mean[+ or -]SDs 47,01[+ or -]4,23 41,32[+ or -]6,60 Cranial p C (n=21) ANS - 41,71- 0,001 (**) A>B=C PNS 71,33 (48,4) 48,96[+ or -]6,41 Midfacial C-ANS 5,53-20,13 0,002 (**) B=C>A (14,6) 14,17[+ or -]3,00 AC 9,9-30,21 0,001 (**) B=C>A (14,3) 15,84[+ or -]4,72 20,54[+ or -]7,23 Ala-BV 18,11- 0,049 (*) C>A 29,72 (23,7) 23,65[+ or -]3,18 CBV 25,91- 0,001 (**) A>B=C 41,58 (34,8) 35,22[+ or -]4,45 C-Alp 33,21- 0,001 (**) A>C>B 60,98 (55,1) 53,81[+ or -]5,90 C-Ala 26,16- 0,025 (*) A>B=C 51,04 (43,7) 42,94[+ or -]5,92 ANS-PNS: Maxilla base plane, C-ANS: Anterior maxilla plane, A-C: Anterior dentoalveolar plane, C-Alp: Full length of vomer bone, C-Ala: mattress of vomer bone, Ala-BV: Height of vomer bone, C-BV: Vomer bone base Kruskal Wallis Test (*)p<0,05 ( **)p<0,01 Table. 3 The Correlation of Vomer Bone Variables with Skeletal Parameters. Type Groups TypeA TypeB TypeC Vomer Skeletal r p r p r p Ala-BV AC 0,457 0,056 -0,169 0,664 0,125 0,589 ANS-PNS 0,701 0,001 (**) 0,142 0,715 0,066 0,775 C-ANS 0,492 0,038 (*) -0,151 0,698 0,137 0,553 CBV AC 0,067 0,791 0,177 0,648 0,165 0,474 ANS-PNS 0,695 0,001 (**) 0,527 0,145 -0,082 0,724 C-ANS 0,061 0,810 0,479 0,192 0,274 0,229 C-Alp AC 0,259 0,299 0,244 0,527 0,131 0,571 ANS-PNS 0,917 0,001 (**) 0,317 0,406 0,092 0,693 C-ANS 0,059 0,817 0,226 0,559 0,328 0,147 C-Ala AC 0,129 0,610 0,034 0,932 0,504 0,020 (*) ANS-PNS 0,858 0,001 (**) 0,400 0,286 0,346 0,124 C-ANS 0,065 0,798 0,142 0,715 0,106 0,648 ANS-PNS: Maxilla base plane, C-ANS: Anterior maxilla plane, A-C: Anterior dentoalveolar plane, C-Alp: Full length of vomer bone, C-Ala: mattress of vomer bone, Ala-BV: Height of vomer bone, C-BV: Vomer bone base r: Spearman's Correlation Coefficient (*)p<0,05 (**)p<0,01 Table. 4 The 3D Model Variables of The Full Face and Vomer Bone. Variable Type A (n=36) Face Model Min-Max (Median) 313310,6-568871,2 (359786,3) Mean[+ or -]SDs 411827,53[+ or -]94680,17 Vomer Model Min-Max (Median) 888,1-1784,3 (1208,6) Mean[+ or -]SDs 1253,64[+ or -]263,46 Variable Type B (n=18) C (n=42) Face Model 307725,2-465322,3 307725,2-568111,4 (421677,7) (493231,8) 395089,79[+ or -]54770,1 482389,16[+ or -]74392,88 Vomer Model 993,6-2119,7 (1889,5) 1073,6-2843,3 (2090,3) 1656,64[+ or -]477,78 2249,77[+ or -]457,69 Variable p Face Model 0,001 (**) C>A=B Vomer Model 0,001 (**) C>B>A r: Spearman's Correlation Coefficient (*) p<0,05 (**) p<0,01
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|Title Annotation:||Original Article / Ozgun Arastirma|
|Author:||Mohi, Ammar; Beycan, Kadir; Yalcinkaya, Sebnem|
|Publication:||Clinical and Experimental Health Sciences|
|Date:||Dec 1, 2018|
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