What was Norman Kingsley's contribution to orthodontics during the latter half of the 19th century?

 # What was Norman Kingsley's contribution to orthodontics during the latter half of the 19th century?

A) He developed the first orthodontic appliances in Greek materials.

B) He was among the first to use extraoral force to correct protruding teeth.

C) He introduced the concept of occlusion in the natural dentition.

D) He focused on the removal of teeth for various dental problems.

The correct answer is B. He was among the first to use extraoral force to correct protruding teeth.

After 1850 the first texts that systematically described orthodontics appeared, the most notable being Norman Kingsley’s Oral Deformities. Kingsley, who had a tremendous influence on American dentistry in the latter half of the 19th century, was among the first to use extraoral force to correct protruding teeth. He was also a pioneer in the treatment of cleft palate and related problems.

Ref: Proffit, W. R., Fields, H., Msd, D. M., Larson, B., & Sarver, D. M. (2019). Contemporary Orthodontics, 6e: South Asia Edition-E-Book. Elsevier India.

Initial clicking of TMJ is a sign of:

 # Initial clicking of TMJ is a sign of:

A. Retruded condyle

B. Unevenness of condylar surfaces

C. Incoordination between condylar surfaces and disc

D. Condyle too far anterior in relation to disc

The correct answer is A. Retruded condyle.

Early stages of disc displacement are characterised by clicking. Clicking can be heard while opening the mouth, while closing the mouth, or both. An opening click signifies recapture of the displaced disc between the articulating joint surfaces. A closing click occurs just prior to tooth contact and is not as loud as the opening click. When the disc becomes non-reducible, i.e. there is no recapture of the disc while opening the mouth, the clicking reduces in intensity or vanishes.

In the early stages (disc displacement with reduction), patients have been described as having increased range of anterior condylar translation. As the stage of disc displacement without reduction ensues, the patient encounters reduced mouth opening and even locked closed in some cases.

Ref: Mehndiratta A, Kumar J, Manchanda A, et al. Painful clicking jaw: a pictorial review of internal derangement of the temporomandibular joint. Pol J Radiol. 2019;84:e598-e615. Published 2019 Dec 23. doi:10.5114/pjr.2019.92287

The best space maintainer for the early loss of upper primary incisor is the pin and tube maintainer, because :

 # The best space maintainer for the early loss of upper primary incisor is the pin and tube maintainer, because :

A. It is aesthetically acceptable 

B. It does not injure the upper lip 

C. It is easy to fabricate 

D. It allows lateral growth of the bone

The correct answer is D. It allows lateral growth of the bone.

The removable pin and tube space maintainer is designed to prevent space loss after the premature loss of a primary incisor. It allows for the natural lateral growth of the bone and provides sufficient space for the permanent tooth to erupt properly. This type of space maintainer is usually considered effective and well-tolerated by patients. While aesthetics and ease of fabrication are also important considerations, the primary purpose of a space maintainer is to preserve the space for the permanent tooth and support proper oral development.

Salt and pepper appearance in MRI of salivary gland is suggestive of:

 # Salt and pepper appearance in MRI of salivary gland is suggestive of:

A. Sjogren syndrome

B. Thalassemia

C. Mumps

D. Salivary gland tumor

The correct answer is A. Sjogren syndrome.

A salt and pepper appearance of the salivary glands on MRI is particularly suggestive of Sjogren syndrome. Salt and pepper appearance of IOPA X rays is seen in Thalassemia.