ChiTuBox

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  I wanted to share a quick demo video showcasing how easy it is to import 3D objects into  ChiTuBox  and highlight some of its user-friendly features. The video demonstrates: Simple drag-and-drop importing  of 3D models (STL, OBJ, etc.) Intuitive interface  for positioning, scaling, and preparing models Efficient slicing  with customizable settings for optimal print quality ChiTuBox streamlines the workflow, making it a great choice for both beginners and experienced users. Let me know if you’d like any additional details or a walkthrough of specific features—I’d be happy to help!
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MCQs on Growth & Development in Orthodontics

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Regarding functional matrix theory, all of the following is correct except ………

a-   It denies the intrinsic growth potential of the cartilage.

b-   Soft tissue adjacent to the bone is the primary determinant of growth.

c-   Both sutures and synchondrosis are growth sites.

d-   Capsular matrix molds bony ridges.

 

2-   The center of rotation occurs at the premolar area in case of ……

a-   Forward rotation type I.

b-   Forward rotation type II.

c-   forward rotation type III.

d-   Backward rotation type II.

 

3-   The increase in the mandibular intercanine width ceases at an age of …….

a-   6 years.

b-   9 years.

c-   12 years.

d-   15 years.

 

Changes in the rate of growth of a child can be detected using growth charts.

a-   True

b-   False.

 

5-   Embryonic stem cells can be derived from the ………….. stage

a-   Morula

b-   Blastomere

c-   Blastocyst

d-   Trilaminar embryo.



  Trigonocephaly results from the premature closure of ………..

a-   Sagittal suture

b-   Metopic suture

c-   Coronal suture

d-   Lambdoid suture.

 

 Vertical direction of condylar growth leads to backward rotation.

a-   True.

b-   False.

 


4-   Middle cranial base is not used for lateral cephalometric superimposition due to…….

a-   Late closure of the spheno-ethmoidal synchondrosis.

b-   Early closure of the intra-occipital synchondrosis.

c-   Late closure of the spheno-occipital synchondrosis.

d-   Early closure of the spheno-ethmoidal synchondrosis.

 

5-   Post natal growth of the mandible after 7 years occur by…………..

a-   Drift.

b-   Primary displacement.

c-   Secondary displacement.

d-   A & b.

 

6-   The extra synostosis found in crouzon than apert syndrome occurs in the …….. suture.

a-   Coronal suture.

b-   Sagittal suture.

c-   Lambdoid suture.

d-   Metopic suture.

 

7-   Prominent chin occurs with …….

a-   Forward rotation type I.

b-   Forward rotation type II.

c-   Forward rotation type III.

d-   B & c


1-   As the saddle angle becomes more acute, the craniofacial pattern will be more towards ………

a-   Class II high angle.

b-   Class II low angle.

c-   Class III high angle.

d-   Class III low angle.

 

2-   Growth of the mid-face in the anteroposterior direction before 7 years occur mainly by ……

a-   Primary displacement.

b-   Secondary displacement.

c-   Drift.

d-   Remodeling.

 

3-   According to the remodelling theory by Brash, ………

a-   Sutures and caritilage are growth sites.

b-   Sutures and cartilage are growth centers.

c-   Sutures are growth sites and cartilage are growth centers.

d-   Sutures and cartilage have no little or no role.

 

4-   The Human face mostly develops prenataly in the ……….

a-   Zygote period

b-   Embryonic period

c-   Fetal period

d-   All of the above.

1-   Pierre robin syndrome is characterized by all of the following except…….

a-   Cleft lip.

b-   Cleft palate.

c-   Retrognathic mandible.

d-   Glossoptosis.

 

2-   The cranial vault grows in width by bone filling in the ……….

a-   Coronal suture.

b-   Interpareital suture.

c-   Pareito-sphenoidal suture.

d-   B & c.

1-   Obtuse saddle angle will lead to backward rotation of the mandible.

a-   True

b-   False.

2-   Crouzon syndrome is characterized by the following malocclusion features except:

a-   Posterior crossbite.

b-   Openbite.

c-   Class III.

d-   Class II.


1-   Craniometry produces longitudinal data of the same individual while anthropometry only allows cross-sectional data.

a-   true.

b-   False.

 

2-   The safest imaging modality regarding radiation hazards is …..

a-   CT scans

b-   CBCT

c-   Panoramic x-ray

d-   MRI

 

3-   At birth the legs represent about one-third of the total body length, whereas in the adult they represent about half. This obsevation is due to the cephalocaudal gradient phenomenon.

a-   True

b-   False

 

4-   Deep bite is a normal finding at …..

a-   3 years.

b-   6 years

c-   9 years

d-   a & c.


1-   The greatest probability of aquiring a class III molar relation is when the primary second molars are in a ….

a-   Distal step.

b-   Flush terminal plane.

c-   Mesial step.

d-   B & c.

1-   An upper midline diastema should always be treated once diagnosed in the mixed dentition.

a-   True

b-   False

1-   In case of pronounced forward rotation, it is difficult to secure anchorage.

a-   True

b-   False.

 

2-   Tooth movement is more rapid and stable if performed after cessation of growth.

a-   True.

b-   False.

 

3-   The ideal timing for facemask treatment is …..

a-   CS1-CS2

b-   CS3-CS4

c-   CS5-CS6

d-   A & B.

 

4-   The discrepancy between the maxillary and mandibular dentition affects the condylar growth according to …… theory

a-   Van limborg theory.

b-   Latham theory

c-   Servo-system theory

d-   Functional matrix theory.

1-   Loss of posterior teeth which supports the vertical dimension of the face results in ……...

a-   Forward rotation type I.

b-   Forward type II.

c-   Forward rotation type III.

d-   Backward rotation type I.

 

2-   Condylar hyperplasia can be treated by …….

a-   High condylectomy.

b-   Costo-chondral graft.

c-   Distraction osteogenesis.

d-   Mouth opening excercises.

 

3-   The anterior facial height is maintained normal in ………

a-   Forward rotation type I.

b-   Forward rotation type II.

c-   Forward rotation type III.

d-   B & c.

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