Premolars

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What are the universal numbers of the premolars?
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Terms in this set (100)
What are the universal numbers of the premolars?
4, 5, 12, 13, 20, 21, 28, 29
What are the functions of premolars?
Mastication
Maintaining vertical dimension of face
Assist canines to shear or cut food
Support cheeks and corners of the mouth
T or F, the anterior teeth determine the VDO
False, the posterior teeth
How many developmental lobes are premolars formed from?
4, except on mandibular 2nd premolars which may have 2 lingual cusps (5 development lobes)
The facial portion of premolars is formed from how many lobes?
3
For all teeth the CEJ curves more apically on which side?
Mesial
Which teeth may have 2 lingual cusps?
Mandibular 2nd PM
Which tooth has a mesial marginal ridge close to 45 degrees?
Mandibular 1st PM
PM crowns in both arches are (shorter/longer) than the crowns of anterior teeth
Shorter
(1st/2nd) PM crowns are slightly longer than (1st/2nd)
First are longer than second; however the roots of 2nd may be longer
PM roots are similar in length which anterior roots?Maxillary incisor rootsThe buccal height of contour on PM is on which third?Cervical thirdThe lingual height of contour on PM is on which third?Middle thirdThe proximal contact areas are more ______ and ______ than on anterior teethCervically located and broaderWhat is the crown outline shape from the buccal view?5 sided pentagonFrom the buccal view, the mesial cusp ridge is (shorter/longer)ShorterThe distal proximal contact on PM is more ______CervicalIn max 1st PM the mesial cusp ridge is ______ than the distalThe same or longerThe tip of PM facial cusp is often slightly _____MesialException: which tooth has a buccal cusp tip that is slightly distal to the root axisMax 1st PMThe crown on the lingual side is (narrower/wider) than the facialNarrower; exception: if the lingual surface has 2 cusps it will be widerThe lingual surface is (convex/flatter) than the buccal/More convexThe mesial marginal ridge is more _______ positioned than the distal marginal ridgeOcclusally; exception: mandibular 1st PMAll PM have a transverse ridge except....Mandibular 2nd PM with 2 lingual cuspsWhat ridges combine to make a transverse ridge?2 triangular ridgesWhat does the transverse ridge separate?The mesial and distal fossaThe lingual embrasure is (wider/narrower) than the buccalWiderWhich arch displays a lingual arch tilt?MandibularIn maxillary, buccal cusp is ____ than lingual cuspLongerIn mandibular, the buccal cusp is _____ than the lingual cuspLonger, especially more sp in mandibular 1st PMWhich PM has a centered lingual cusp?Mandibular 1stMandibular PM may have a more _____ tilt of the crown relative to the rootDistal tiltbuccal ridge is more prominent in which arch?MaxillaryWhich PM on both arches has a more prominent buccal ridge?The first is more prominent than second on both but max is more prominent than mandibularFrom the occlusal view, maxillary is _____Oblong/rectangular; wider FL than MDFrom the occlusal view, mandibular is _______More equal dimension; same FL as MDThe crown of the first maxillary PM is (larger/smaller) than the second?LargerThe cusp is more _____ on a max 1st PM than the 2nd?PointedWhere are the locations of contact on maxillary PM?Contacts in middle third; distal contacts are slightly more cervical than mesial for maxillary PMFrom the buccal view, where are the buccal cusp tips on maxillary PMs?In 1st, buccal tip is more distal (UNIQUE). In 2nd, buccal tip is more mesialWhat is unique about maxillary FIRST buccal cusp tips?They are distal to the mid-root axis lineBetween the maxillary PMs, which one has a more prominent buccal ridge?More prominent on the firstWhich maxillary PM is more likely to have a bifurcated root?1stSince the maxillary 1st PM has a unique buccal cusp that is shifted distally, the mesial cusp ridge is (longer/shorter) than the buccal cusp ridgeLongerWhich cusp ridge is shorter in the 2nd max PM?MesialIn max 1st PM, which side of the buccal ridge is more pronounced (deeper)?MesialIn max 2nd PM, which side of the buccal cusp ridge is deeper?DistalBoth maxillary PM have a lingual cusp tip positioned ______ to the midroot axisMesiallyMax 1st PM is the only PM to have a proximal crown depression on which side?Mesial side (the big canine manspreads and needs room)On which max PM is there a greater height difference between the buccal and lingual cusps?First PMFor max PM, where is the lingual height of contour?The middle third (like all posterior teeth)Where is a marginal ridge groove most likely to be found on max PM?The mesial side of a 1st max PMWhich tooth is the ONLY one that has a mesial root depression more pronounced than the distal?Max. 1st PMFrom the occlusal view, which max PM is larger?FirstThe length of the central groove on a max 1st PM is ______ than on the secondLongerThe maxillary 2nd PM has more ______ than the first on the occlusal surfaceSupplemental groovesOn max 1st PM, the ______ makes the central groove appear even longerMesial marginal ridge grooveFrom the occlusal view which max PM is more symmetrical?2ndBetween the arches, which one varies more in shape for PMMandibularWhich PM is more likely to have 2 lingual cusps?Mandibular 2nd PMWhich mandibular PM has a buccal cusp that is sharper?First is sharperIn a mandibular 1st PM, the mesial contact is more _____CervicalA mesial cusp ridge notch is more common on which mandibular PM?Mand 1stA distal cusp ridge notch is more common on which mandibular PMMand 2ndThe ______ cusp ridge is shorter on both mandibular PMMesialIn which circumstance would the lingual side of a mand PM be wider than the buccal half?If there are 2 lingual cuspsIf a mandibular 2nd PM has 2 lingual cusps, which will be bigger?The mesioligual cusp is biggerThe lingual tilt is more significant on which mandibular PM?The first PMMesiolingual groove is often visible from the mesial on which mandibular PM?FirstMandibular first PM have root depressions on both sides but is deeper on which side?DistalThe mesial marginal ridge mandibular 1st PM is (higher/lower) than the distalLowerMandibular 1st PM has what shape from the occlusal view?DiamondDescribe the shape of the mesiolingual corner of a mandibular first PMThe corner is flat (pushed in)From the occlusal, the two cusp mandibular second has what shape? Shape of the 3 cusp?Round or oval; 3 cusp will be squarerWhat is the only PM with a central fossa/pit?A three cusp mandibular 2nd PMT or F three-cusp mandibular 2nd PM have a transverse ridgeFalse, there are three triangular ridges that do not connectMaxillary second PM has what shape from the occlusal view?RectangularThe maxillary first PM has what shape from the occlusal?HexagonThe mandibular 1st PM has what shape from the occlusal view?DiamondMandibular 2nd PMs (2 and 3 cusps) both have what shape from the occlusal view?SquareFrom the proximal view, mandibular second premolars have what shape?Rhomboid (parallelogram)From the proximal view, maxillary 1st premolars have what shape?TrapezoidWhich PM have a nonfunctioning lingual cusp?Mandibular 1stWhich two premolars most frequently have a groove crossing the mesial marginal ridge or one groove just lingual to it?Maxillary first PMsWhich tooth has a depression in the cervical third of the mesial side of the crown and rootMaxillary first PMWhich maxillary PM has a longer sharper buccal cusp?Maxillary first PMWhat is the largest maxillary premolar?Maxillary first PMMandibular PM with the longest and sharpest buccal cuspMandibular 1stMaxillary PM that is the most symmetrical (occlusal view)Maxillary second2 premolars without a central grooveMandibular 1st, mandibular 2nd (3-cusp)Which PM has crowns tipped lingually with respect to the root-axis line (proximal view)Mandibular 1st and 2nd (2 and 3 cusps)From the buccal view, crown is tipped distally from the root axisMandibular 1st and 2nd (2 and 3 cusps)Mesial marginal ridge is more cervically located than its distal marginal ridge on which PMMandibular 1st PMWhich PM has no transverse ridge?Mandibular 2nd (3 cusp)Which PM has the longer central groove?Maxillary 1stPM with 2 major cusps almost the same sizeMaxillary 2ndWhich PM has a central fossa?Mandibular 2nd (3 cusp)PM with only 2 fossae: both are triangular fossaeMaxillary 1st and 2nd and mandibular 2nd (2 cusp)Which PM has a central fossa and two triangular fossaeMandibular 2nd (3 cusp)Which PM has a lingual groovemandibular 2nd (3 cusp)