MDS PREP
How soon after the eruption of permanent tooth is the apex usually fully developed?
1. Immediately
2. 3-6 months
3. 2-3 years
4. 6-9 years
Dental Anatomy
Answer: 3
Afet tooth eruption in permanent teeth the apex is fully developed after 2-3 years
Temporalis muscle is inserted into:
1. lip and lateral surface of coronoid
2. Tip and medial surface of coronoid
3. Tip and anterior border of coronojd upto external oblique ridge
4. B and C
Anatomy
Answer: 2
Temporalis muscle is inserted into Tip and medial surface of coronoid
Zygomaticotemporal nerve is a branch
1. Maxillary nerve
2. Facial nerve
3. Mandibular nerve
4. Nasociliary nerve
Anatomy
Answer: 1
Branches of Maxillary nerve are
1. Middle meningeal n.
2. zygomatic n. : zygomaticofacial, zygomaticotemporal
3.pterygopatine branches : orbital, post. sup. lat. nasal , medial septal, greater palatine, middle palatine , post. palatine
4. post. sup alveolar
5. Infraorbital
middle sup. alveolar
anterior sup. alveolar
6. Terminal
lat. nasal
inf. palpebral
sup. labialis
The fibres of Purkinje?
1. Are remains of embryonic cardiac muscle fibres
2. Are placed over the pericardium
3. Arise from the sinu-arterial noded a and b both
4. a and b both
Anatomy Answer: 1
These form specialized fibres of the heart and are supposed to be terminal filaments of bundle of His. They are placed beneath the endocardium and intervene between it and the myocardium.
The secretory product of odontoblasts is:
1) Topocollagen.
2) Calcium salts.
3) Mantle dentin.
4) Hydroxyapatite
Dental Anatomy
Answer: 3
Dentinogenesis is the formation of dentin by odontoblasts of mesenchymal origin
located at the periphery of the dental pulp
Dentinogenesis is initiated by the inductive influence of the enamel organ
involving molecular signaling pathways, such as Wnt, Runx-2, and TGF-?. In the
molar tooth, dentinogenesis starts at the late bell stage, and occurs in the
crown as well as root regions.
Predentin, the first organic matrix secreted by odontoblasts, is composed by
proteoglycans, glycoproteins, and collagens.
When extracting a primary maxillary incisor in which the root has been partially resorbed because of pres sure from its developing succe daneous tooth, which aspect of the remaining primary root will usually be longest and attached most securely to the gingiva?
1. Facial
2. Mesial
3. Lingual
4. Distal
Dental Anatomy
Answer: 1
In the case of primary teeth, the roots are often resorbed as the permanent teeth develop. The facial aspect of the root tends to be the last area to undergo resorption due to its position and the way the succedaneous tooth exerts pressure. The facial root surface is generally more stable and remains attached to the gingiva longer than the other aspects, making it the longest and most securely attached during extraction.
The muscle least related to pterygomandibular raphe is
1. superior pharyngeal constrictor
2.medial pterygoid
3. lateral pterygoid
4.buccinator
Anatomy
Answer: 3
The muscle least related to the pterygomandibular raphe is the lateral
pterygoid. The pterygomandibular raphe primarily connects the superior
pharyngeal constrictor and the buccinator muscles, while the medial and lateral
pterygoid muscles are involved in the movement of the jaw but do not have a
direct attachment to the raphe. Here’s a breakdown of the relationships:
Muscle Relationships to the Pterygomandibular Raphe
Superior Pharyngeal Constrictor:
Attaches to the posterior margin of the pterygomandibular raphe.
Plays a role in swallowing and constricting the pharynx.
Medial Pterygoid:
While not directly attached, it is located near the pterygomandibular
raphe and contributes to jaw movement.
Lateral Pterygoid:
Least related to the pterygomandibular raphe.
Primarily involved in moving the jaw forward and side to side, with
no direct attachment to the raphe.
Buccinator:
Attaches to the anterior margin of the pterygomandibular raphe.
Important for chewing and keeping food between the teeth.
The beginning of active eruption of a human tooth occurs
1. before the root has begun to develop
2. coincidental with the beginning of root formation
3. before the root has begun to develop
4. after one half of the root is formed
Dental Anatomy
Answer: 4
The beginning of active eruption of a human tooth occurs after one half of the root is formed