Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
When does primary dentition last until?
|
Primary dentition exists until beginning of mixed dentition with the emergence (eruption) of the permanent first molars at age six, which erupt distal to the primary second molars. Thus the permanent molars have no primary predecessors.
|
|
|
1. How do primary teeth compare in size?
2. How do they compare in color? 3. Describe the cervical ridges of primary teeth. How do they appear at the cervix? 4. How are the roots in relation to adult teeth? |
• Primary teeth are smaller in overall dimensions but bear resemblance to permanent teeth except the primary Mandibular first molar which is the most unique primary tooth morphologically
• Primary teeth are lighter in color • Primary teeth have more pronounced cervical ridges (i.e. cervical 1/3 B & L height of contour) • Primary teeth appear more constricted at the cervix (neck) • Primary roots are long and narrow in relation to crown width and length |
|
|
1. How do the pulp horns compare?
2. Describe the shape of the roots of primary teeth? What do the trunk roots look like? 3. Describe the buccal and lingual surfaces of primary molars |
• Primary teeth have large pulps with long pulp horns (esp. molars)
• Primary molars have more flared and slender roots which extend beyond the crown outlines, thus allowing space for the growth and development of the succeeding permanent teeth (i.e. premolars) • Primary molars have short root trunks with furcation areas approaching the CEJ • Primary molars have buccal and lingual surfaces that are more convergent occlusally which results in a narrower occlusal table |
|
|
1. How does the enamel of primary teeth compare to adult teeth?
2. How much dentin do primary teeth have compared to adult teeth? 3. How does the shape of the root compare to the crown? |
• Primary teeth have thin enamel with consistent thickness; enamel rods of primary molars at the CEJ point occlusally rather than gingivally as with permanent molars
• Primary teeth have little dentin between pulp and dentino-enamel junction (DEJ) (clinically significant) • Primary anterior teeth have comparatively longer and narrower roots with respect to their crowns (which appear wider mesiodistally and shorter occlusocervically than the permanent anterior teeth) |
|
|
What is missing from the incisal ridge of primary anterior teeth?
|
No mamelons!
|
|
|
1. What is Leeway Space? How is this relevant to primary and permanent molars?
|
Primary molars are wider mesiodistally than the premolars that replace them (the difference between the two dimensions is called the Leeway Space which allows space for some mesial movement of the permanent first molars as the premolars erupt)
• Asjawsgrow,spacingbetweenprimary anteriors occurs thus providing room for the larger permanent successors to erupt |
|
|
Primary teeth sequence..
• Mand. Central • Mand. Lateral • Max.Central • Max. Lateral • Mand. M1 • Max.M1 • Mand. Canine • Max.Canine • Mand. M2 • Max.M2 |
1. Mand central: 6 mos
2. mand lateral: 7 mos 3. Max central: 7+ mos 4. Max lateral 8 mos 5. Mand M1: 12 mos 6. Max M1: 12+ mos 7. Mand canine: 16 mos 8. Mas canine: 16+ mos 9. Mand M2 20 mos 10. Max M2 20+ mos |
|
|
Primary anterior teeth: incisors
1. Do they have mamelons? 2. Where are the heights of contour? 3. Describe the mesial and distal CEJ in relation to one another. 4. What are the roots like? 5. What is the DI angle shape? |
• Incisors – very similar in form to permanent counterparts, but smaller
• no mamelons • crown form appears squatted • marked buccal and lingual cervical ridges (bulges) i.e. heights of contour • mesial CEJ more incisally positioned than distal as in all teeth • roots more narrow and pointed • DI angle of lower lateral incisor quite rounded |
|
|
Primary canines
1. What is the shape of the crown? 2. Describe the mesial cusp and distal ridge? 3. Where are the cervical bulges more prominent, max or mand? 4. Which canines, max or mand, have less prominent marginal ridges? What aspect is this on? |
• Canines – maxillary canine has diamond-shaped crown (facial view)
• maxillary canine has longer mesial cusp ridge (slope) than distal slope (opposite of permanent max. canine) • maxillary canine has marked facial and lingual cervical bulges • mandibular canine has arrow-shaped crown (facial view) • mandibular canine has shorter mesial slope than distal slope • mandibular canine more slender with less prominent marginal ridges on lingual aspect |
|
|
Max 1st molar - primary
1. What tooth does it resemble? Which cusp is the largest? 2. In what dimension is the crown wider? 3. Where are the heights of contour? 4. How many roots and what is their shape? |
• 1st Molar – basically resembles maxillary premolar (two major cusps: MB and ML are largest; DB and DL insignificant in size; smallest DL cusp not always present; largest cusp is MB
• crown wider mesiodistally than occlusocervically • prominent B & L cervical heights of contour (bulges) esp. B • Threerootslikemaxillarymolarbutmore slender and flared • Very small root trunk |
|
|
Max 2nd molar - primary
1. What tooth is this identical to? How is it slightly different from this tooth? 2. What is the root trunk like? 3. How is it in relation to the first molar? |
• 2nd Molar – morphologically identical to permanent maxillary 1st molar including cusp of Carabelli; smaller and squatter than permanent maxillary 1st molar; roots more flared and slender
• very small root trunk • larger than primary 1st molar; greatest faciolingual diameter of all primary teeth |
|
|
Mandibular 1st molar - primary
1. What tooth does this resemble? 2. How many cusps does this toot have, what are their relative sizes? 3. What are the MB and ML cusps connected by? 4. How does the occlusal table appear? What is the appearance of the roots? |
Mandibular
• 1st Molar – morphologically unique; does not resemble any other tooth (primary or permanent) • fourcusps:twobuccalandtwolingual;MBis largest; ML conical (pointed) and tall; MB & ML are larger than DB & DL • transverse ridge connects MB and ML cusps • prominentbuccalcervicalridge • narrowocclusaltable • twodivergentroots:MandD(mesialisthickest) • very small root trunk |
|
|
Mandibular 2nd molar - primary
1. What tooth is this identical to? but how is it slightly different from this tooth? 2. Where are the bulges and constrictions? 3. How many roots? |
• 2nd Molar–morphologically identical to permanent mandibular 1st molar including distal cusp (D cusp more similar in size to the other two buccal cusps)
• smaller and squatter than permanent mandibular 1st molar • exhibits cervical bulges and constriction like other primary teeth • two roots (M and D) more flared and slender than permanent 1st molar; small root trunk |
