New dh questions

[missiondds]

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mineral content of cementum is closet to:

enamel
dentin
bone
pdl
cartilage



cementum is histologically most similar to:

enamel
dentin
bone
cartilage
pdl
connective tissue

 

[krasnodar]

BONE & BONE not sure

 

[aspirantdentist]

BONE & BONE not sure

Hi Krasnodar,

Your answer is correct.

Explanation for Q-1 :- Cementum- Inorganic composition-55%, Organic composition-45%. For bone, Inorganic-50% & organic-50%.

Explanation for Q-2 :- Both bone & cementum have lacunae, canaliculi when viewed under microscope.

 

[missiondds]

Hi Krasnodar,

Your answer is correct.

Explanation for Q-1 :- Cementum- Inorganic composition-55%, Organic composition-45%. For bone, Inorganic-50% & organic-50%.

Explanation for Q-2 :- Both bone & cementum have lacunae, canaliculi when viewed under microscope.

1: bone is correct

2: bone.. not sure coz.. it is avascular n lacks nerve supply like cartilage and is embedded in its own matrix like the same. while it resembles bone by being present in lacunae

 

[dental material]

Which part of the tooth calcify first?

a DEJ
b Cingulum

 

[missiondds]

Which part of the tooth calcify first?

a DEJ
b Cingulum

answer: cingulum

 

[ronu24]

u r right mission dds

answer: cingulum

 

[missiondds]

what is true about line of schreger?

FOUND IN ENAMEL CLOSE TO CEJ REGION

EXTENDS FROM SURFACE OF ENAMEL TO DEJ

CAN BE SEEN ONLY ON EM

CAN BE SEEN ONPHOTOGRAPHY OF CUT SURFACE OF ENAMEL

 

[umska]

Found in the inner 2/3 of the enamel. Rods in outer 1/3 are parallel to each other.

 

[missiondds]

eruption time for which two teeth concides:

mandibular 1molar and max lateral

max 1molar and mand lateral

mandibular lateral and max central

mandibluar lateral and max lateral.

 

[missiondds]

eruption time for which two primary teeth concides:

mandibular 1molar and max lateral

max 1molar and mand lateral

mandibular lateral and max central

mandibluar lateral and max lateral.

 

[dreamchaser]

answer: cingulum

why cingulum can anybdy explain this??
calcification start at DEJ written in deck
n also if u see tooth development 1st layer of dentin is formed immediately before enamel formation by odontoblast..
cingulum is formed latter in tooth development

 

[d dimps]

eruption time for which two primary teeth concides:

mandibular 1molar and max lateral

max 1molar and mand lateral

mandibular lateral and max central

mandibluar lateral and max lateral.

I would say mandibular lateral and maxillary central becoz the man lateral erupts around 7th month and maxillary central at around 7 and a half months........
According to dental decks

 

[d dimps]

why cingulum can anybdy explain this??
calcification start at DEJ written in deck
n also if u see tooth development 1st layer of dentin is formed immediately before enamel formation by odontoblast..
cingulum is formed latter in tooth development

I too agree with dreamchaser. Calcification starts at DEJn and then progress further.