NEET MDS Shorts
54248
Dental Anatomy
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.
62072
Dental AnatomyThe beginning of active eruption of a human tooth occurs after one half of the root is formed
72434
Dental Anatomy
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.
84261
Dental Anatomymadibular first molar normally have 3 root canals
24825
Dental AnatomyThe first teeth to erupt in the dental arches of the human being are the, primary mandibular central incisors
64908
Dental AnatomyThe primary mandibular central incisors usually erupt at 6-8 months
53389
Dental Anatomy
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.
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Dental AnatomyThe largest and longest root canal of the maxillary second molar is the lingual
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Dental Anatomypermanent maxillary First molar teeth normally has four root canals
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Dental AnatomyIn an average child the mixed dentition period is from 6 yrs to 13 y