WHO Oral Health Assessment Form Filled Samples

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Monomer in heat cure denture base acrylic resins

 # In heat cure denture base acrylic resins, the monomer is:

A. Methyl methacrylate

B. Ethyl methacrylate

C. Methyl ethyl methacrylate

D. Polymethyl methacrylate

The correct answer is A. Methyl methacrylate.

Most polymethyl methacrylate resin systems include powder and liquid components. The powder consists of prepolymerized spheres of polymethyl methacrylate and a small amount of benzoyl peroxide, termed the initiator, which is responsible for starting the polymerization process. The liquid is predominantly nonpolymerized methyl methacrylate monomer with small amounts of hydroquinone. Hydroquinone is added as an inhibitor, which prevents undesirable polymerization or “setting” of the liquid during storage. Inhibitors also retard the curing process and thereby increase working time.

Ref: Phillip’s Science of Dental Materials, 12th Edition, Page no. 475

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Esthetic Appliances for Orthodontic Treatment

 # In adults seeking orthodontic treatment with esthetic appliances the following may be choices EXCEPT:

a) Lingual orthodontics 

b) Ceramic brackets

c) Clear aligner therapy

d) Titanium brackets

The correct answer is D. Titanium brackets.

All other options are considered esthetic orthodontic appliances because they are either not visible or highly perceptible. Titanium brackets display metal and are not esthetic. Clear aligner therapy can be used for minor orthodontic corrections and can be preferred by patients due to esthetics and ease of use. 

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Rotated Maxillary Central Incisor

 # A child is brought to the clinic with complaint of irregular teeth. The maxillary central incisor is rotated in an otherwise normal occlusion. What should the next step be?

a) Check for supernumerary teeth

b) Resection of supracrestal fibers

c) Exert a couple on tooth

d) Fixed orthodontic appliances given  

The correct answer is a. Check for supernumerary teeth.

Unerupted mesiodens and the presence of thick labial frenum between the central incisors are common causes of midline diastema.

Before attempting to close midline diastema, radiographs should be taken to rule out supernumerary teeth as the cause of diastema.

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