Yazan Jahjah | University of Tartous (original) (raw)

Papers by Yazan Jahjah

Among the criteria required for orthodontics diagnosis and treatment planning, both Sagittal Jaws... more Among the criteria required for orthodontics diagnosis and treatment planning, both Sagittal Jaws Relationship (S.J.R.) and Lower Incisors Crowding (L.I.C.) are critical. There have been no local data obtained and documented which relate interrelationship between (S.J.R.) and L.I.C. amongst adolescents (with permanent dentition) on the Syrian coast. It was the aim of this study to search this interrelationship amongst adolescents (with permanent dentition) on the Syrian coast using ANB angle for assessing the (S.J.R.) The material of this study consisted of mandibular dental study casts, lateral cephalometric and panoramic graphs of 81 Caucasian patients (18 males and 63 females) from 13 to 19 years of age, from pretreatment patients undergoing orthodontic evaluation at the Department of Orthodontics and Dentofacial Orthopedics at Tishreen University. Mandibular dental study casts and lateral cephalometric were scanned and digitized, Little’s Irregularity Index, (ANB) angle meanings...

Romanian Journal of Stomatology, 2015

Understanding the complexities of cranial base development, function, and architecture is importa... more Understanding the complexities of cranial base development, function, and architecture is important for testing hypotheses about many aspects of craniofacial variation and evolution. Architecturally, the cranial base provides the platform upon which the brain grows and around which the face grows. In addition, the cranial base connects the cranium with the rest of the body: it articulates with the vertebral column and the mandible, provides conduits for all the vital neural and circulatory connections between the brain, the face and the neck, houses and connects the sense organs in the skull, and forms the roof of the nasopharynx. The shape of the cranial base is therefore a multifactorial product of numerous phylogenetic, developmental, and functional interactions. Aim. The aim of this research is to perform a morphometric analysis of the skull base to investigate the symmetry between the two hemibases of the cranial fossa with each other in adult patients with normal type of lower...

International Journal of Biomedical Science and Engineering, 2016

In orthodontic diagnosis, an accurate evaluation of sagittal jaw relationship is critically impor... more In orthodontic diagnosis, an accurate evaluation of sagittal jaw relationship is critically important. There are numerous angular and linear measurement could be used to evaluating the antero-posterior jaw discrepancy between maxilla and mandible so as to reach the correct diagnosis such. The usual practice is to compare the cephalometric analysis of the patient with the established normal values. Since craniofacial morphology varies among different populations therefore it becomes important to establish the cephalometric norms of all cephalometric analyses, for every population. The aims of this study were to evaluate the validity of ANB Angle, BETA Angle, W Angle and YEN Angle in Syrian sample. Materials and methods: 60 lateral cephalometric radiographs of Syrian population (35 boys and 25 girls), were traced for ANB, Wits appraisal, Beta angle, W angle and YEN angle. Patients were divided into skeletal Class I, II and III groups. Result: No statistically significant difference was found in all measurements values. ANB, BETA, W and YEN angle not differed significantly from the stander measurements in all three groups (p<0.05). The mean value for: the ANB angle for the Syrian population was3.4 degrees with SD of 0.6, and for the Beta angle was30degrees with SD of 4.2, and for the W angle was 53.7degrees with SD of 1.6. YEN angle mean value for the Syrian population was 120 degrees with SD of 1.5. These results suggest that all the performed analyses are valid and can be used to diagnose skeletal discrepancies and diagnosis based on single analysis is insufficient.

International Journal of Dental and Health Sciences, 2015

The aims of this study were to investigate the possible association between the TMJ structure and... more The aims of this study were to investigate the possible association between the TMJ structure and facial pattern in subjects with no clinical or radiographic symptoms of TMDs, by using sagittal and axial slice computed tomography imaging. In result of a multistage clinical examination protocol 60 Caucasian patients with no prior orthodontics treatment who had to have a CT scan for medical purpose, (but not especially for this study) were selected from 16 to 29 years of age with no clinical signs and symptoms of TMDs. The images obtained from the axial and sagittal slices, Cephalometric growth pattern study was performed according to Jarabak. The facial and TMJ proportions data were analyzed using independent sample Student t-test and Pearson correlation analysis Results: In subjects with no clinical or radiographic symptoms of Temporomandibular Joint Disorders, No significant differences in the joint spaces, and joint morphology between left and right TMJs were found. There was a statistically significant relation between (condyle dimensions, Depth of the mandibular fossa, angle and height of the articular eminence) and facial patterns. Pearson's Correlation test showed A significant correlation (with different direction and strength) between TMJ measurements and most of Cephalometrics facial pattern measurements. Conclusion: In subjects with no clinical or radiographic symptoms of Temporomandibular Joint Disorders, there was a statistically significant relation between TMJ morphology and facial patterns. The value of condyle dimensions, Depth of the mandibular fossa, angle and height of the articular eminence were significantly larger in Horizontal facial pattern than normal and vertical facial pattern.

Tishreen University Journal for Research and Scientific Studies - Health Sciences Series Vol. (37) No. (5) 2015, 2015

 ABSTRACT  The aim of this research is to investigate the dimensional and positional symmetries... more  ABSTRACT  The aim of this research is to investigate the dimensional and positional symmetries between the right and left condyles ,and the possible asymmetries between the condylar processes that could be related to the type of growth pattern in adult subjects with no clinical nor radiographic symptoms of TMDs. Materials and methods: In result of a multistage clinical examination protocol, 14 Caucasian patients with normal growth pattern ,and with no prior orthodontics treatment were selected (14 females)from 17 to 29 years of age with no clinical signs and symptoms of TMDs. The images obtained from the axial and sagittal slices, Cephalometric growth pattern study was performed. Pearson's Correlation Coefficient and T-test were calculated. Results :no statistically significant relationship between the measurements of TMJ(left &right) and the normal growth pattern. Conclusions:There is no relationship between the morphology of TMJ and normal growth pattern in adult female orthodontically non-treated .

International Journal of Biomedical Science and Engineering, 2016

Tishreen University Journal of Health Sciences/مجلة جامعة تشرين للعلوم الصحية, 2015

Keeping the nasal morphology balanced with the other parts of the face and in harmony with the ty... more Keeping the nasal morphology balanced with the other parts of the face and in harmony with the type of the facial growth constitutes one of the most challenging goals that have to be carefully considered in planning of the Orthodontics and Dentofacial Orthopedic treatment. Nostrils are part of the soft tissue of the nasal respiratory system, which affected on growth development of the craniofacial complex. Aim to investigate the relationship of the Nostrils Morphology with Facial Growth Type in adults using Cone-Beam Computed Tomography (CBCT) scan. Materials and methods: 23 adult subjects (8 males, 15 females), were chosen from pretreatment patients undergoing orthodontic evaluation at the Department of Orthodontics and Dentofacial Orthopedics at Tishreen University and were ordinary undergoing CBCT scan for non-orthodontics nor for otolaryngology purpose. Cephalometric measurements determining facial growth type were performed according to Jarabak's analysis. Pearson's Correlation Coefficient was calculated to investigate the relationship between the CBCT nostrils measurements and Cephalometric measurements determining facial growth type. Results: studied CBCT nostrils measurements have differences with statistical significance between the two genders. CBCT nostrils measurements have relationship with facial type growth. Conclusions nostrils morphology appears to vary with the type of facial growth. Key Words: nostrils morphology, Facial growth cephalometric evaluating according to Jarabak, Nostrils soft-tissue CBCT.
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يعتبر تحقيق توازن صفات شكلية مع بقية العناصر المكونة للوجه وإبقائها منسجمة مع نموذج النمو الوجهي تحدياً من أكثر التحديات صعوبة والتي يجب أن يتم أخذها بعين الإعتبار بحذر بالغ أثناء التخطيط للمعالجة في تقويم الأسنان والفكين، حيث يعد منخري الأنف جزء من النسيج الرخو المكون للجهاز التنفسي الأنفي الذي يؤثر على نمو وتطور المركب القحفي الوجهي
هدف البحث: تحري وجود علاقة بين الصفات الشكلية لمنخري الأنف وبين نموذج النمو الوجهي وذلك لدى أفراد من البالغين باستخدام التصوير الطبقي المخروطي.
مواد وطرق البحث: بلغ أفراد العينة 23 بالغاً (8 ذكور،15 أنثى) من مراجعي قسم تقويم الأسنان والفكين بكلية طب الأسنان بجامعة تشرين ولم يخضعوا لمعالجة تقويمية سابقة حيث تم انتقاؤهم من مرضى كانوا تلقائياً بصدد إجراء تصوير طبقي محوري مخروطي لأسباب لا تتعلق بمشاكل تقويمية أو بأمراض الأنف والأذن والحنجرة، تم إجراء دراسة سيفالومترية للنمو الوجهي وفق تحليل جاراباك، ومن ثم تحليل معامل ارتباط بيرسون لدراسة العلاقة بين قياسات منخري الأنف المجراة على صور الطبقي المحوري المخروطي مع القياسات السيفالومترية المحددة لنموذج النمو الوجهي.
النتائج: قياسات منخري الأنف المجراة على صور الطبقي المحوري المخروطي تمتلك فروقات ذات دلالة إحصائية بين الجنسين، قياسات منخري الأنف المجراة على صور الطبقي المحوري المخروطي يمتلكان علاقة ذات دلالة إحصائية مع نموذج النمو الوجهي.
الخلاصة: يبدو أن الصفات الشكلية لمنخري الأنف تتغير بتغير نوع نموذج النمو الوجهي.
كلمات مفتاحية: الصفات الشكلية لمنخري الأنف، نمو وجهي محدد حسب جاراباك، تصوير طبقي محوري مخروطي للنسج الرخوة للمنخرين.

Tishreen University Journal of Health Sciences/مجلة جامعة تشرين للعلوم الصحية, 2015

Mandible articulates with the cranium via the TMJ, all the component of the TMJ, including the TM... more Mandible articulates with the cranium via the TMJ, all the component of the TMJ, including the TMJ disc, seems to be associated with altered characteristics of the craniofacial complex and its growth, but it is not clear yet the exact role of the TMJ disc thickness during the process of the facial growth. Aim The aim of this study is to investigate the association between the TMJ disc thickness and the facial growth determined according to Jarabak in adult male subjects with no clinical or MRI symptoms of Temporomandibular Joint Disorders. Materials and methods: 20 males from 19 to 25 years of age, were selected as volunteers from pretreatment patients undergoing orthodontic evaluation at the Department of Orthodontics and Dentofacial Orthopedics at Tishreen University with no clinical or MRI symptoms of TMDs., cephalometric growth study was performed according to Jarabak. MRI study was performed of both TMJ for calculating disk thickness Pearson's Correlation Coefficient was calculated to investigate the relationship between the TMJ disc thickness's measurements (left & right) and cephalometric measurements determined according to Jarabak's analysis for estimating facial growth. Results: no significant relationship between the measurements of TMJ disc thickness (left &right) with the cephalometric measurements determined according to Jarabak for estimating facial growth in adult male subjects with no clinical or MRI symptoms of TMDs. Conclusions No relationship between the measurements of TMJ disc thickness (both sides) with the cephalometric measurements determined according to Jarabak for estimating facial growth in adult male subjects with no clinical or MRI symptoms of TMDs Key Words: Facial growth cephalometric evaluating by Jarabak , TMJ disc thickness, male subjects with no clinical or MRI symptoms of TMDs.

Tishreen University Journal of Health Sciences/مجلة جامعة تشرين للعلوم الصحية, 2015

First Cervical Vertebra (Atlas) belongs to the Atlantoaxial joint which connecting the base of th... more First Cervical Vertebra (Atlas) belongs to the Atlantoaxial joint which connecting the base of the skull with the spine. Its play a highly significant role in growth and function of the craniofacial complex. Atlas, have function-anatomical interrelationship with the TMJ. That mean the Axis involved with the morphogenetic and function of the jaws. Aim investigating the relationship of Atlas's dimensions with jaws rotation in adult orthodontically non-treated subjects using CBCT scan. Materials and methods: The size of this study's sample was 30 Caucasian patients (12 males, 18 females) from 19 to 25 years of age, (mean age of 21.1 years) with no history of prior orthodontics and who had to have a CBCT scan for non-neurological disorders purpose (but not especially for this study). Cephalometric jaws rotation study was performed according to Björk and Skieller on CBCT-derived 2-dimensional lateral cephalograms. Pearson's Correlation Coefficient was calculated. Results: This study reveal vary correlation between CBCT measurements of Atlas's dimensions and jaws rotation according to the gender, although CBCT measurements of Atlas's dimensions showed no statistical significant differences between the two genders. Conclusions there is a relationship between the morphology of the Atlas and Jaws rotation in adult orthodontically non-treated subjects. Key Words: first cervical vertebra CBCT scan; dimensions of Atlas; jaws rotation.

Tishreen University Journal of Health Sciences/مجلة جامعة تشرين للعلوم الصحية

Articular eminence participates in the functional formation of the posterior guidance of the mand... more Articular eminence participates in the functional formation of the posterior guidance of the mandibular movement, it's the anatomical point where functional stresses can result in alteration of the contours of the articular eminence, and its inclination respectively, Hence, orthodontists need to know the relationship between the articular eminence Inclination and the mesiodistal inclination of upper and lower incisors to achieve more stable results of orthodontics treatment. Aim The aim of this research is to investigate the relationship of upper and lower incisors mesiodistal inclination with the inclination of the articular eminence in class I skeletal occlusion in adult subjects with no clinical nor radiographic symptoms of TMDs. Materials and methods: In result of radiographic study and a multistage clinical examination protocol, 46 Caucasian patients with no prior orthodontics treatment were selected (19 males, 27 females) from 16 to 27 years of age with skeletal class I occlusion and no clinical or radiographic signs and symptoms of TMDs. Furthermore, cephalometric evaluating of the Inclination of the articular eminence and the mesiodistal inclination of the incisors was performed; Pearson's Correlation Coefficient was calculated to investigate the relationship of articular eminence Inclination with the mesiodistal inclination of the incisors. Results: no significant relationship between incisors mesiodistal inclination and the articular eminence inclination was found. Conclusions the steepness of the articular eminence appears not to vary with mesiodistal inclination of the incisors in skeletal class I occlusion adults with no clinical and radiographic symptoms of TMDs.
Key Words: articular eminence Inclination, incisors mesiodistal inclination, skeletal class I occlusion, clinical and radiographic asymptomatic TMDs orthodontics patients.

Aim: the aim of this study was to evaluate the possibility of using of phenomenon of extend of th... more Aim: the aim of this study was to evaluate the possibility of using of phenomenon of extend of the resorption on sectional area on the first two successive c.t. axial sections of the apex of the teeth root as radiographic parameter of the root resorption during the orthodontic treatment
Methods: Axial CT-scans and C.T. reconstructed 3-D graphs of 76 females & 24 males which were treated with different kind of orthodontic techniques, All graphs were taken by a Spiral C.T. at the beginning (T1), after 3 (T2) and 6 months (T3) of the treatment; tooth length and extend of the resorption on sectional area on first and sec-ond axial slices were studied. Every variable in each stage was compared with the same variable in other stages using T-test (P< 0.05)
The current results revealed that the extend of the resorption on sectional area on the first axial slice on the successive C.T. axial sections of the apex of the teeth root can be used as an early radiographic index of root resorption at the beginning of orthodon-tic treatment, but not the second axial slice; In addition, most changes took place dur-ing the first 3 months of orthodontic treatment.
Key Words: Root Resorption, Phenomenon of Root Apex Flattening, Radiographic Ax-ial C.T. Scan, Axial Slices.

جامعة دمشق - Damascus University.

"" PhD Study Dr.Yazan Jahjah , (Orthodontic Department, Dentistry school, Damascus University... more "" PhD Study
Dr.Yazan Jahjah , (Orthodontic Department, Dentistry school,
Damascus University).

Aim: to evaluate the relationship between the beginning of root resorption and the type of orthodontic treatment technique used.
Methods: Axial CT-scans and C.T. reconstructed 3-D graphs of 100 patients (76 females, 24 males) were taken to evaluate the presence of root resorption. According to the orthodontic technique applied, patients were divided into four groups: 25 patients treated with Edgewise technique, 25 patients treated with Straight-Wire technique (Roth), 25 patients treated with sectional arch technique (Ricketts) and 25 patients treated with removable appliances. Lateral cephalometric and panoramic graphs were also taken. All graphs were taken at the beginning (T1), after 3 (T2) and 6 months (T3) of the treatment. The number, depth, and diameter of detected tooth root lacunae, tooth length, and apex flattening were studied using a spiral high quality CT. Every variable in each stage was com-pared with the same variable in other stages using T-test. In addition, every variable in each technique group was compared with the same variable in other techniques. Moreover, the number of affected teeth and its percentage to the number of all presented teeth in each technique group at T2 and T3 was statistically compared using Z test. A total of 2132 treated teeth was examined: 538 teeth in the Edgewise technique group (25.23%), 576 teeth in the Straight-Wire technique group (27.01%), 540 teeth in the sectional arch technique group (25.32%) and 478 teeth in the removable appliance group (22.42%). The level of significance of all statistical tests used was set at 0.05.
Results: Only six patients (6%) showed root resorption at T2; three patients in the Straight-Wire technique group and one patient in each of the other technique groups. At T3, the affected patients were the same six patients affected at T2. The C.T. finding of root resorption at the beginning of orthodontic treatment showed one of the following types: reduction in the tooth length on C.T. reconstructed 3-D graphs, apex flattening on axial CT-scans, lacunae resorption on C.T. reconstructed 3-D graphs and lacunae resorption on axial CT-scans.
Conclusions: The current results revealed that straight-wire technique could cause more reduction in tooth length than other techniques. The number of affected teeth in the Straight-Wire technique group was statistically significantly more than that in other techniques. Apex flattening at T2 and T3 was found in the Straight-Wire group only. Therefore, straight-wire technique could cause more root resorption than other techniques. In addition, most changes took place during the first 3 months of orthodontic treatment, which means that the high risk of root resorption can occur during the leveling stage in treatment with fixed appliances.
""

From a stand point of crossing the diagnostic data from various types of diagnosing images in the... more From a stand point of crossing the diagnostic data from various types of diagnosing images in the three dimensions of space, in an attempt tp put the right diagnose of the orthodontic case, and expand the spectrum of the utilizing from the panoramic image, we had done the following :
• Suppose an analysis that could identify the symmetry of the skeleton anatomical structures on the panoramic image after its reliably is recognized through the comparison of the symmetry in both: from image and Panoramic image.
• Study the possibility of the identify the growth pattern through the panoramic image.
• Study the possibility of identify the sagittal position of the mandible through the panoramic image and this had done by two methods:
1- A direct study of the correlation between the measures of the TMJ on the M.R.I. and on the panoramic image. (The specimen is categorized according to the type of malocclusion).
2- An indirect study of the correlation between the measures of the TMJ on M.R.I. and the panoramic image relied on study the extend relation between the mean value of linear and angular measurements of both left and right M.R.I. images for TMJ, with respect of the sagittal position of the mandible which could be identified on the lateral Cephalometric to connect this relation (if existed) with the panoramic image data's to make thereafter the specific panoramic measurements which could identify the sagittal position of the Mandible (the specimen is categorized according to the type of malocclusion.
In aim to achieve the above goals, 200 patients had subjected to a clinical examination in the department of orthodontic at the Damascus University and a random specimen of 100 patients without taking sex, age and type of malocclusion in consideration, with regard of the osteoarthrose cases and the large extend of dental loss.
We had made lateral cephalometric and panoramic images for all the 100 patients.
Five patients had been exposed twice to the same Panoramic X-ray Unit to emphasis the possibility of repeating the images without deformations of the measury
We had asked the 100 patients to do additional panoramic images with a different X-ray unit in order to study the ratio of deformation between the two X-ray Unit but Only 20 patients answered the call.
We had done frontal Cephalometric images for 20 patients (from the 100) whom had facial asymmetric (in addition to the previous Cephalometric and panoramic images).
Again, a random specimen without taking sex, age and type of malocclusion in consideration of 20 patients (from the 100) had subjected to TMJ MRI (Left and right).
We could obtain an angular panoramic measurement, which allow doing a skeletal symmetrical examination on the panoramic image for both horizontal and vertical structures.
We could not emphasis the ability of doing a dental symmetrical analysis throughout the panoramic image.
Once could obtain a diagnostic data from panoramic correlated to the growth pattern of the patient, but this was poor if compared with the lateral Cephalometric image.
The panoramic image could not give any information about the sagittal position of the mandible
Finally by doing a comparison between the lateral Cephalometric data and the TMJ M.R.I. data no correlation between the morphology of the TMJ and the sagittal position of the mandible had exited that could determine the sagittal position of the mandible

The relationship between the steep of articular eminence and the sagittal relationship of ‎ the j... more The relationship between the steep of articular eminence and the sagittal relationship of ‎ the jaws‎ and growth pattern.

Abstract:

A clinical examination had done for 200 patients seek the department of Orthodontics at Damascus Univercity, then a study of their panoramic and lateral cephalometric films was also been done and this was in centric occlusion.
All the above studies had done before any orthodontics treatment has taken place.
Then only 17 patients was been selected as sample.
The aim of this research is to find out, through the cephalometric study, any existent relationship between the sagittal jaws position and growth and the morphology of the adequate T.M.J., and this has done through one of its components, which was articular eminence, without negation of the correlation between the malocclusion and the T.M.D.
This study could not at the end emphasis an obvious relation among the changes of the articular eminence and the categories of malocclusions.
This was acceptable with Ricketts results.
A relation between articular eminence's angles and the growth pattern will exist.

Abstract:: "Among the criteria required for orthodontics diagnosis and treatment planning, both ... more Abstract::
"Among the criteria required for orthodontics diagnosis and treatment planning, both Sagittal Jaws Relationship
(S.J.R.) and Lower Incisors Crowding (L.I.C.) are critical. There have been no local data obtained and
documented which relate interrelationship between (S.J.R.) and L.I.C. amongst adolescents (with permanent
dentition) on the Syrian coast. It was the aim of this study to search this interrelationship amongst adolescents
(with permanent dentition) on the Syrian coast using ANB angle for assessing the (S.J.R.)
The material of this study consisted of mandibular dental study casts, lateral cephalometric and panoramic
graphs of 81 Caucasian patients (18 males and 63 females) from 13 to 19 years of age, from pretreatment
patients undergoing orthodontic evaluation at the Department of Orthodontics and Dentofacial Orthopedics
at Tishreen University. Mandibular dental study casts and lateral cephalometric were scanned and digitized,
Little’s Irregularity Index, (ANB) angle meanings were calculated digitally using Ceph Basic™ software.
This study reveals no statistical signifi cant differences in crowding severity between the two sexes, except for
the group of very severe irregularity (p = 0.03, α = 0.05). Sex differences in distribution amongst the (S.J.R.)
groups were noted, no subjects with perfect alignment, no group of L.I.C. have signifi cant relationship with
meanings of (ANB) angle, while the correlation analysis between every single class of (S.J.R.) and the
meanings of Little index reveals signifi cant correlation only between skeletal class II and L.I.C. (r = -0.35).
Only skeletal class II has slightly inverse relationship with L.I.C., but not with specifi c degree of L.I.C. severity,
as this study revealed no specifi c relationship between the severity degree of L.I.C. and the meanings of
(ANB) angle.
Key words: lower incisors crowding, sagittal jaws relationship, permanent dentition,
adolescents on the Syrian coast"

Apical root resorption is an inflammatory process that is extremely complex and the most serious ... more Apical root resorption is an inflammatory process that is extremely complex and the most serious side effect associated with orthodontic treatment. It is not completely definite yet the relationship between the kind of treatment techniques and the root resorption.

Books by Yazan Jahjah

Tartous University

Oral & Dental Physiology (The Temporomandibular Join Physiology) for dental students

Tartous University , 2019

كتاب تقويم الأسنان والفكين النظري والعملي 1 و 2 لطلاب كلية طب الأسنان منشورات جامعة طرطوس ... more كتاب
تقويم الأسنان والفكين

النظري والعملي 1 و 2

لطلاب كلية طب الأسنان
منشورات جامعة طرطوس

Theoretical and Practical Orthodontics and Dentofacial

Orthopedics 1 & 2

Written by Dr. Yazan Jahjah

Assistant Professor at Orthodontics and Dentofacial Orthopedics Department & Head of the Department of Orthodontics and Dentofacial

Romanian Journal of Stomatology, 2015

International Journal of Biomedical Science and Engineering, 2016

International Journal of Dental and Health Sciences, 2015

Tishreen University Journal for Research and Scientific Studies - Health Sciences Series Vol. (37) No. (5) 2015, 2015

International Journal of Biomedical Science and Engineering, 2016

Tishreen University Journal of Health Sciences/مجلة جامعة تشرين للعلوم الصحية, 2015

Tishreen University Journal of Health Sciences/مجلة جامعة تشرين للعلوم الصحية

جامعة دمشق - Damascus University.

"" PhD Study Dr.Yazan Jahjah , (Orthodontic Department, Dentistry school, Damascus University... more "" PhD Study
Dr.Yazan Jahjah , (Orthodontic Department, Dentistry school,
Damascus University).

Abstract:

Tartous University

Oral & Dental Physiology (The Temporomandibular Join Physiology) for dental students

Tartous University , 2019

النظري والعملي 1 و 2

لطلاب كلية طب الأسنان
منشورات جامعة طرطوس

Theoretical and Practical Orthodontics and Dentofacial

Orthopedics 1 & 2

Written by Dr. Yazan Jahjah

Assistant Professor at Orthodontics and Dentofacial Orthopedics Department & Head of the Department of Orthodontics and Dentofacial