HEAD NECK
ORAL CAVITY AND TONGUE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Maxillary first
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Maxillary second
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Mandibular first
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Mandibular second
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Detailed explanation-1: -The maxillary first premolar is the most commonly bi-rooted tooth with occasional presentation of three roots system; it is a transitional tooth between incisors and molars. Although it usually has two canals, it may rarely have three and this third canal can easily be missed.
Detailed explanation-2: -A study of 150 extracted maxillary first premolars from citizens of Seville, Andalusía, southern Spain, revealed 60 teeth with one root (40.0%), 85 teeth with two roots (56.7%) and five teeth with three roots (3.3%).
Detailed explanation-3: -Fusion of two buccal roots is one of the most common aberrations of maxillary molars. A total of 0.4% of first maxillary molars and 2.2% of second maxillary molars have been reported to have this variation [30].
Detailed explanation-4: -Maxillary first molars are generally three-rooted with four root canals (Fig. 4.13). The additional canal is located in the mesiobuccal root.