Tooth Morphology

Tooth morphology

Tooth Morphology

Tooth Morphology

Tooth Morphology - Lecture Series Announcement

Tooth Morphology

Questions	Answers
Well developed tubercle arises from	A supplemental lobe
Bunodont means teeth having	It refers to the teeth bearing cone shaped cusps.
Bunodont bearing animals are unable to	Laterally deviate their jaws
Odontoblast produce large amount of secondary dentin in the	Floor and roof of the chamber
The smallest occlusal embrasures in the permanent dentition are those seen between	Central incisors
Incisal ridge includes the	Complete incisal surface; Labioincisal edge; Linguoincisal edge
In the permanent maxillary central incisors developmental grooves are generally seen in the	Palatal surface and They are seen in the palatal fossa.
In permanent mandibular incisors from the incisal aspect, the incisal ridge is _________ to the line bisecting the root.	Lingual
From the proximal aspect of a permanent maxillary canine, the line bisecting the cusp will be ________ to the line bisecting the root.	Labial
The root apex with a mesial tilt is often the	Mandibular canine

Tooth Morphology

Questions	Answers
Oblique ridge may be seen in	Deciduous maxillary first molar; Deciduous mandibular first molar; Deciduous maxillary second molar
Disto-occlusal groove is a feature of the deciduous	Maxillary first molar
The crown of deciduous maxillary second molar as compared to the deciduous maxillary first molar is	Larger
As compared with the deciduous maxillary first molar, the distopalatal cusp of deciduous maxillary second molar is	Well developed. It is opposite in the permanent dentition.
Lingual developmental groove is not commonly observed in deciduous	Maxillary first molar
Usually in the deciduous mandibular first molar, the mesiobuccal and distobuccal cusp are separated by a	Developmental depression
The sudden appearance of spaces between anterior teeth in children of 4 to 5 years of age is due to	Growth of jaws
The interproximal space between healthy teeth is	Triangular in shape. It is filled by a triangular shaped marginal gingiva called as interdental papilla.
From incisal aspect the incisal ridge of an anterior tooth is _________ over to the root.	Centered
Labial developmental grooves are often a feature of	Permanent maxillary central incisor

Tooth Morphology

Questions	Answers
The loss of deciduous teeth or exfoliation tends to mirror the	Eruption sequence of deciduous dentition
Generally the increase in rate of prevalence of caries in tooth types is the	Reverse the order of eruption
The permanent teeth to develop before any of the deciduous teeth are lost are the	Permanent first molars. Usually the first permanent molars arise distal to the second molar of an intact deciduous dentition.
Compared with the cusp of the permanent maxillary canine, deciduous maxillary canine are	Longer and sharper
Form the labial aspect the incisal edges of a permanent mandibular lateral incisor are slanting with the shorter side being	Distally
As compared with deciduous mandibular canine, the deciduous maxillary canine is larger	Labiolingually
From the buccal aspect the deciduous first maxillary molar is _________ than the mandibular second molar.	Smaller
The premolar section of deciduous dentition is	Maxillary first molar
In the deciduous dentition the dimension at the cervical third is _______ than the occlusal third at all molars.	Greater
The buccal convexity, a characteristic feature of the deciduous posterior teeth is much pronounced at the	Cervical third

Dentin

Questions	Answers
In predentin area, the area occupied by peritubular dentin is	About 3%
"Translucent dentin" is often butterfly shapped owing to	Convergence of dentinal tubules pulpally
"Translucent dentin" occurs when dentinal tubule infilled	At root apex from cementum extend cervically and towards root apex.  Direction is towards cervically.
Dentinal lymph has higher concentration of	Higher concentration of potassium ions and lower concentration of sodium ions.
"Aspiration" of odontoblastic nuclei occur	With releasing of compression of tooth, the nuclei is taken in to the tubule
From the pulp to DEJ, the mineral content of dentin, hardness and elastic modolous	Decreases
From the pulp to DEJ, thickness of mineral crystals	Increases
The intermediate dentin is	A layer between predentin and mineralized dentin
Major difference between the mantle dentin and circumpulpal dentin are	Mantle dentin is relatively less mineralized; collagen fiber are perpendicular to enamel; branched dentinal tubule; presence of mineralization by matrix mineralization
Mineral in dentin is deposited as	Globules or calcospherites

Dentin

Questions	Answers
The approximate number of tubules in inner dentin is	50,000 per sq mm
The approximate number of tubules in middle of dentin is about	40,000 per sq mm
The secondary curvature of dentinal tubule sometime coincide with adjacent dentin tubule, giving a appearance of line crossing dentin is	Contour line of Owen
As compared to intertubular dentin, Peritubular dentin lacks a	Collagenous fibrous matrix
The type of dentin seen in routine demineralized section is	Intertubular dentin
During routine demineralization, the type of dentin lost is	Peritubular dentin
The cause of loss of peritubular dentin in conventional demineralizaton is	Its lack of collagen, that imparts the stability
The mineral component of peritubular dentin is	Carbonated appatite
The difference between crystalline forms of peritubular and intertubular dentin is	Peritubular dentin has predominantly hexagonal shapped crystallites while intertubular dentin crystallites appears as compact platelets
In peripehral or mantle dentin, peritubular dentin occupies	Two thid of entire cross section of dentin.

Tooth Morphology

Questions	Answers
The teeth noted as 55 refer to the	Human deciduous right maxillary second molar
The teeth number that is notified as 27 in the clinical notation is	Human deciduous right mandibular canine
The teeth number that is notified as 27 in the FDI notation is the	Human permanent left maxillary second molar
The portion of the jaw that serves as a support for tooth is	Alveolar process. The rest are not part of the jaw but they provide the support for the tooth to be kept in its place.
The surface of tooth facing towards the adjoining teeth in the same dental arch is the	Proximal surface. Facial surface is that part that is towards the lips or buccal mucosa. The surface nearer to palatal is the palatal surface. The surface of tooth facing towards the opposing teeth in the same dental arch is the occlusal surface.
The proximal surface of a tooth that is farthest from the midline is	Distal surface. The proximal surface that is nearest to the midline is the mesial surface.
The linear elevation on the proximal surface of a tooth nearer to the occlusal surface is the	Marginal ridge
The human permanent first molar starts to calcify at	At birth
The term “12 year’s molars” in humans refers to the	Permanent second molars. Permanent first molars are referred as “6 year molars”.
The minimum numbers of centers of formation of a human tooth is	Four

Tooth morphology

Questions	Answers
The most primitive cusp of the permanent maxillary first molar is the	Mesiopalatal cusp
The outline of the root trunk of permanent maxillary first molar reminds of the _________________ stage of human tooth evolution.	Tritubercular. Both the root trunk and the stage are triangular.
The occlusal table of permanent maxillary first molar is made up of	2 major and 2 minor fossa. The major fossa (central, distal) and minor (mesial triangular and distal triangular)fossa. In a permanent mandibular first molar it is 1 major fossa (central fossa) and 2 minor fossa (distal and mesial fossa)
In the permanent mandibular first molar, the mesiobuccal developmental groove  separates the	Mesiobuccal lobe and distobuccal lobe. The distobuccal developmental groove separates distobuccal lobe from distal lobe.
Tubercle of Zuckerland is associated with	Deciduous maxillary first molar. It is a tubercle found in the deciduous maxillary first molar on the facial or the buccal aspect near the cervical ridge.
In a normal permanent maxillary central incisor, incisal surface inclines cervically from the labioincisal edge to the palatoincisal edge by an angle of	45 degrees
A typical human permanent maxillary lateral incisor is positioned by an angle of ______ degrees to the occlusal plane.	65
A typical human permanent maxillary lateral incisor is positioned by an angle of ______ degrees to the mid saggital plane.	10
In human permanent dentition, the teeth that exhibit a bilateral symmetrical form from facial aspect is	Mandibular central incisor. Maxillary central incisors have a rounded distoincisal angle and sharp mesioincisal angle. Maxillary canine have unequal slopes. Mandibular lateral incisor towards the distal side has a slope.
The ridge that provides centric stops for opposing cusps is the	Marginal ridge

Tooth morphology

Questions	Answers
The permanent maxillary molars usually have	2 buccal and 2 palatal cusps. Sometimes they have an accessory cusp called as the cusp of Carabelli.
The strongest and largest maxillary teeth are the	Permanent molar
As compared with the buccopalatal width, the mesiodistal width of the permanent maxillary first molars is	Lesser. Whereas mesiodistal width is greater as compared to the buccolingual width in mandibular molars.
The supplemental cusp of permanent maxillary first molars is found palatal to	Mesiopalatal cusp
The resistance to torsion is greatest in a permanent maxillary first molars is by	Mesiobuccal root
In permanent maxillary first molars, the mesial slope of the distobuccal cusp meet its distal slope at	Right angle
In a permanent maxillary first molars, the distal surface from buccal aspect appears	Spherical
The average length of root trunk of a permanent maxillary first molar is	4 millimeters. For a permanent mandibular molar it is approximately 3 millimeter below the cervical line.
In a permanent maxillary first molar the mesiodistal width of mesiopalatal cusp is about ________ of mesiodistal width of crown palatally.	Three fifth
Arrange the cusps of permanent maxillary first molar in descending order	Mesiopalatal > mesiobuccal> distopalatal>distobuccal. arrangement of cusp in a permanent mandibular first molar is mesiobuccal> Mesiolingual> distolingual> distobuccal> distal cusps