Morpho Lab

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    TOOTH IDENTIFICATION

    This topic accounts for about%07 of the practical exam

    It's very important for you to know the steps that you have to follow allthe time to identify the tooth, so what are these steps ??1. You have to identify the set of the tooth

    Regarding the set, the tooth is either permanent or deciduous

    Here you have to use the set traits

    What are the set traits that may help you distinguish permanent toothfrom deciduous tooth ??

    a. Size

    Permanent teeth are larger in size than deciduous teeth (i.e.permanent central incisor is larger than primary central incisor)

    b. Color

    Deciduous teeth are lighter in color than permanent teeth that's why

    they (deciduous teeth) are called milk teeth

    c. Cervical constriction

    Exists in deciduous but not in permanent

    d. Amount of root trunk in molars

    Very little in deciduous but long in permanent (the furcation beginsvery cervically in deciduous molars)

    e. Amount of root divergence

    The roots are very divergent and flared out in deciduous and very thinalso

    2. You have to identify the class of the tooth

    Regarding the class, the tooth is either an incisor, c-*--anine, premolaror molar

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    Here you have to use the class traits*** There's NO premolars in the deciduous dentition

    3. You have to identify the arch of the tooth

    tooth is either maxillary or mandibularRegarding the arch, the

    Here you have to use the arch traits

    4. You have to identify the type of the tooth

    i.e. If the tooth is a molar, then is it a first , second or a third molar?

    If the tooth is a premolar, then is it a first or a second premolar?If the tooth is an incisor, then is it a central or a lateral incisor?

    Here you have to use the type traits

    *** Canines have NO type traits

    5. You have to identify the side of the tooth (the most important)

    Regarding the side, the tooth is either from the right side or the leftside of the mouth

    ** How can we know whether the tooth is a right or a left tooth??

    >>> You have to identify all the aspects of the tooth

    For post. teeth the occlusal aspect is the one that can tell you the mostabout the side of the tooth

    For ant. teeth the labial aspect is the one that can tell you the mostabout the side of the tooth

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    Labialaspect

    Incisal aspect

    *** Questions :

    *** Can you identify this tooth ??

    * First, you have to identify the set of the tooth>>> Regarding the size it is a permanent tooth

    * Second, you have to identify the class of the tooth

    >>>

    * From the labial aspect :This tooth has an incisal edge that is flattened MD

    * From the incisal aspect :

    1. This tooth has long horizontal biting edgethat is compressed LL2. This tooth has 3 mamelons

    All these tell you that the tooth is an incisor* Third, you have to identify the arch of thetooth

    >>>1. The crown is wide MD

    2. MD dimension of the crown is slightly smallerthan the IC dimension (height/width proportionis very small)3. MD dimension of the root = LL dimension4. The labial surface is rounded as seen from theincisal aspect

    So >>> The arch of this tooth is the maxillary arch

    * Forth, you have to identify the type of the tooth

    >>>From the labial aspect :1. the crown of the tooth is very wide MD2. the MI and DI angles aren't that much rounded (MI angle is sharp)3. the root is conical in shape

    From the lingual aspect :

    Proximalaspect

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    1. M and D marginal ridges, cingulum and lingual fossa all these aren'tthat much pronounced2. NO lingual pit

    All these tell you that the tooth is a central incisor* Fifth, you have to identify the side of the toothIn maxillary central incisors :1. the MI angle is sharp (0 degrees) while the DI angle is rounded2. the M outline is straight while the D outline is rounded3. the MI angle is higher (more toward the incisal edge) than the DIangle4

    . you can use the M and D HOCs also (MHOC is higher than the DHOC)5. Very very important point: always remember that the M outline isinlined with the outline of the root while the D outline isn't inlined withthe outline of the root, it is located outside the outline of the root.

    oneleftthetooth isside of theheT>>>So

    So >>>>> the tooth is maxillary left permanent central incisor (21)

    If you want to place it in the mouth then :

    Rounded

    DI angle

    Rounded

    D outline

    Sharp

    MI angle

    Stright Moutline

    DHOCMHOC

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    *** Can you identify this tooth ??1. What is the set of the tooth??

    Regarding the size this tooth is a permanenttooth

    2. What is the class of the tooth??

    > It has only one conical pointed cusp>> It doesn't have an occlusal surface>>> As seen from the proximal aspect it'sroot is very thick LL>>>> It has a well developed cingulum(that's why it can't be a premolar)

    >>>>> It has 2 well developed depressions(Mesio-labial and Disto-labial) on the labial surfaceSo >>>>The class of the tooth is a canine

    3. What is the arch of the tooth??

    > Notice the overhanging of the proximal outlines (how

    they are located outside the root)

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    >> As seen from the proximal aspect notice that the cusp tip islocated labial to the LL bisecting line (this point is very importantand critical in the differentiation btwn max. and mand. canines)>>> MD dimension > IC dimension of the crown

    >>>> As seen from the lingual aspect, the cingulum is veryprominent, M and D marginal ridges are prominent also, the ML andDL fossae are very deep and the lingual pit is apparent>>>>> M and D outlines are markedly convergent towardthe cervix>>>>>> You can sometimes depend on the position of HOCs whichare relatively lower in maxillary than in mandibular

    All these tell you that this canine is from the maxillary arch

    4. What is the type of the tooth?? Canines have NO type traits

    5. What is the side of the tooth?? > MSR (mesial sloping ridge) is shorter than the DSR>> MI angle is higher and more rounded than the DIangle>>>You can also identify the side of the tooth from the incisalaspect, notice the amount of asymmetry btwn the M and D halves,the D half is wider than the M half (D half is thick MD and thin LL,while the M half is thin MD and thick LL) and by this you can knowwhich is the M side and which is the D side

    WiderD half

    SmallerM half

    DLfossa

    MLfossa

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    Based on these : the side of the tooth is the right one

    So >>>> The tooth is maxillary right permanent canine (13)

    ** Can you identify this tooth??1. What is the set of this tooth?? (is it permanent ordeciduous ??)

    > It is large in size>> This tooth is natural, and it isn't very white in colorand this somehow excludes being deciduous>>> We don't see any cervical constriction at the area

    btwn the crown and the root portions of the tooth

    So >>> The set of this tooth is permanent

    2. What is the class of the tooth?? (is it incisor, canine, premolar ormolar ??)

    > This tooth has a biting edge that is flattened MD and compressed

    LL>> As seen from the incisal aspect, this tooth has 3 mamelons

    So >>> The class of this tooth is incisor

    3. What is the arch of this tooth?? (is it max. or mand. Incisor??)

    > The crown is wide MD>> MD dimension of the crown is slightly smaller than the

    IC dimension (height/width proportion is very small)>>> MD dimension of the root = LL dimension (veryimportant)>>>> The labial surface is rounded as seen from theincisal aspect

    So >>> The tooth is a maxillary incisor

    4. What is the type of the tooth?? (is it max. central or max. lateralincisor??)

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    Slightly roundedMI angle

    Markedlyrounded DI angle

    > The crown outlines are very rounded and the crownisn't that much wide MD>> MI and DI angles are very rounded (MI angle isn'tsharp)>>> As seen from the lingual aspect, the M and Dmarginal ridges are very prominent, the cingulum is veryconvex and prominent, the lingual fossa is very deep andhas a pit>>>> The root isn't1007 conical (remember that incentral incisors the root is 1007 conical)

    So >>> The type of the tooth is

    incisorlatera

    5. What is the side of the tooth??(is it a right or a left max. lateral incisor??)

    > DI angle is markedly rounded while the MI angle isslightly rounded>> MHOC is higher than the DHOC (MI angle is higherthan the DI angle)

    >>> M outline is slightly rounded while the D outline ismarkedly rounded>>>> M outline is inlined with the outline of the rootwhile the D outline isn't inlined with the outline of theroot, it is located outside the outline of the root.

    So >>> The side of the tooth is the left side

    The tooth is maxillary left permanentlateral incisor

    *** Can you identify this tooth??1. This tooth is a permanent tooth

    2. What is the class of the tooth??

    Very convexcingulum

    Very deep

    lingual fossa

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    > This tooth has 2 cusps