Which surface of the maxillary first premolars contains a root concavity?
mesial surface
The mesial surface of the maxillary first premolar has a significant concavity adjoined to the coronal concavity (Figure 1). In contrast, the distal root surface is flat with minimal to no root-surface concavity except coronal to the furcation.
Does the maxillary second premolar have a mesial marginal ridge?
The maxillary second premolar do not have this feature. The presence of a well defined developmental grooves in the enamel of the mesial marginal ridge. This groove is called the “Mesial Marginal Developmental Groove”.
Which tooth has mesial cusp slope greater than distal cusp slope?
If the buccal cusp form has not been changed by wear, the mesial slope of the cusp is longer than the distal slope. The opposite arrangement is true of the maxillary canine. Generally, the first premolar is not as wide in a mesiodistal direction as the canine.
How many roots does maxillary second premolars have?
Maxillary second premolar is generally considered to have one root and one canal [2, 3, 6, 14]. In the present study only 13.8% had one root canal end in one apical foramen (type I, Figure 1).
When the maxillary first premolar has more than one root which description applies?
When the maxillary first premolar has more than one root, which description applies? There are most often two roots: a facial and a lingual. Which premolar is likely to be wider mesiodistally in the lingual half versus in the facial half (that is, taper narrower from lingual to facial)?
How are maxillary premolars different?
From the occlusal view, maxillary premolars are more oblong or rectangular (considerably wider faciolingually than mesiodistally), whereas mandibular premolars, though usually wider faciolingually, are closer to equal dimension faciolingually compared to mesiodistally (Fig. 4-10).
What features distinguish the 1st premolars from the 2nd premolars both upper and lower )?
There are two types of premolars; the mandibular premolar and maxillary premolar. The key difference between the first and second premolars is based on their buccal side view. The first premolars are very sharp in their buccal side, whereas the second premolars are less sharp in their buccal side.
How many cusps does the maxillary second premolar have?
two cusps
[1] In endodontic literature, the standard anatomy of maxillary second premolar has been described to have two cusps[2] (Buccal-B and Palatal-P), one root and one or two canals (B and P).
What are the cusps on a maxillary first premolar?
There are two cusps on maxillary first premolars, and the buccal (closest to the cheek) cusp is sharp enough to resemble the prehensile teeth found in carnivorous animals.
What percentage of maxillary second premolars have 2 Foramina?
All teeth were single-rooted (n = 116). The numbers of main and accessory apical foramina are shown in Table 2. Maxillary second premolars had 1 main foramen in 59.5% and 2 in 37.9%. Three or more apical foramina were observed in less than 2.6%.
What is the mesial concavity of the first premolar?
Mesial concavity – A unique feature of the mesial surface of the maxillary first premolar is the mesial concavity. This depressed area is variable in its extent.
What is the maxillary first premolar?
The maxillary first premolar is the first posterior tooth in the maxillary dental arch. There are four premolars in the maxillary dental arch two in each quadrant. The term premolar is used for these teeth because these teeth are anterior to the permanent molars.
What type of tooth is the second premolar?
The maxillary second premolar tooth shares a mesial contact with the maxillary first premolar and a distal contact with the maxillary first molar. This tooth is a succedaneous tooth, replacing the deciduous maxillary second molar.
What is the archarch position of the second premolar?
Arch position – The permanent maxillary second premolar is the fifth tooth from the midline. It shares a mesial contact with the maxillary first premolar and a distal contact with the maxillary first molar. It is a succeda-neous tooth, replacing the deciduous maxillary second molar. b. Universal number: