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SYNOPSIS - INTRODUCTION TO ORTHODONTICS

Orthodontics (Greek. orthos = correct; odontos = teeth) is that branch of dentistry concerned with prevention, interception and correction of malocclusion and other abnormalities of the dento-facial region. The term 'Orthodontics' was first coined by le Felon.

Interesting / most difficult / most frightening / most challenging / unforgettable/ potentially fatal

Every dentist examines a number of  patients each day and gains more and more the clinical skills required for diagnosis and gains insight to distinguish between the conditions that appear very similar to each other clinically and are confusing to a neophyte in the field of dentistry.

You must have heard the saying "The eyes only see what the head knows" as a student which is true indeed. A good knowledge of the condition, its manifestations, signs and symptoms are vital to make a differential diagnosis pointing towards the correct direction. Even the general public these days believe that  older the doctor, the lesser the lab investigations he needs and demands before making a diagnosis. What are your opinions about that ?

Please Share your interesting / most difficult / most frightening / most challenging / unforgettable/ potentially fatal cases you've managed so far and share your feelings during the procedure, after completing it, and the lessons you learnt. You can share as many as you like. Have a nice time. Thank You !!!

Types of Dentitions

TYPES OF DENTITIONS

Monophyodont Presence of only one set of dentition for entire life. 
Diphyodont
• Presence of two sets of dentition 
• Human beings are diphyodonts 
Polyphyodont Presence of more than two sets of dentition. 
Homodont
All the teeth have same shape without distinction such as incisors, canines, premolars and molars. 
Heterodont Presence of different groups of teeth. 
Bunodont
• Primitive type of teeth seen in primates like cats, dogs, etc. 
• Contains simple conical cusps. 
Haplodont
• Seen in reptiles like crocodiles. 
• Simplest cone form of teeth with single root.
• Only simple hinge movements of jaws are seen. 
Triconodont
• Seen in early mammals. 
• Three cusps are arranged in line with the largest cusp in the center.
Tritubercular stage
• Three cusps are arranged in triangle form.  
Quadritubercular stage
• 4th cusp is formed and an occlusal contact relationship between the upper and lower 
jaws is established. 

Except molars, all the permanent teeth (incisors, canines and premolars) are known as succedaneous teeth because they take the place of their primary predecessors.

MCQs in Fixed Partial Dentures - Principles of Tooth Preparation


# The average root surface area of maxillary first molar is (in mm2):
A. 133
B. 233
C. 333
D. 433

# The average root surface area (mm2) of the maxillary second premolar is:
A. 234
B. 220
C. 273
D. 204