MDS PREP
The first bone to Ossify in the body is
1. Mandible 2 Maxilla
3. Clavicle 4. Calvarium
Anatomy
Answer: 3
Clavicle is the first bone to Ossify in the body
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
Primary teeth begin to calcify between the ________ and ________months in
utero.
1) first; second
2) second; fourth
3) fourth; sixth
4) sixth; eighth
The primary teeth begin to form in utero at about six weeks. Hard tissue
formation occurs in all primary teeth by the 18th week in utero. 3. The
permanent teeth begin to develop at approximately four months of age in utero.
Maxillary and mandibular first molars begin to calcify at birth.
Which of the following muscles has two separate functions in mandibular
movement
1) Masseter
2) Geniohyoid
3) External(lateral)pterygoid
4) Buccinator
Anatomy Answer: 3
The external (lateral) pterygoid muscle has two primary functions: it assists in depressing the mandible (opening the mouth) and in moving the mandible forward (protrusion). This dual function distinguishes it from other muscles of mastication, which primarily elevate the mandible.
If a 4th root canal is present in a maxillary 1st molar, it will likely be located in which of the following roots?
1) Mesiolingual
2) Mesiobuccal
3) Distolingual
4) Distofacial
Dental Anatomy Answer: 2
Well over 50% of maxillary 1st molars have two canals in the mesiobuccal root. Some authors cite the number as high as 90%.
There are usually 3 roots and 4 canals in a maxillary 1st molar.
The fourth canal, the mesiolingual canal, is also referred to as: the accessory mesiobuccal canal, mesiocentric, mesiopalatal canal or MB2.
It is usually tough to find MB2 through clinical inspection and it is not obvious on a radiograph. A dentist should expect it is present before beginning a root canal on the first maxillary molar.
The canine eminence is
1. associated with the mandibular canine only
2. the labial ridge on the crown of canine
3. an osseous structure surrounding the root of a canine on the facial aspect
4. the prominent ridge on the lingual surface of a maxillary canine
Dental Anatomy Answer: 3
The canine eminence is
an osseous structure surrounding the root of a canine on the facial aspect
The cricothyroid artery is a branch of the
1. occipital artery
2. superior thyroid artery
3. facial artery
4. superficial temporal artery
Anatomy
Answer: 2
The cricothyroid artery is a branch of the superior thyroid artery
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.