Most previous studies on maxillary molars have reported that these teeth usually have three roots and four canals since an extra canal is often found in the mesiobuccal root. Thus, due to having a more complex anatomy compared to other teeth, maxillary molars have the highest rate of endodontic failure.
Full Answer
How many roots does the maxillary third molar have?
The maxillary third molar has three roots. The three roots are usually fused and they function as a single root. The roots incline the distal aspect. A single large lingual cusp is present. The lingual surface of the maxillary third molar crown is smooth with no developmental groove or depression.
How common are three-rooted molars?
Three-rooted molars are oddities in most modern dental practices. Molars generally have just two roots, but occasionally a third, smaller root grows. In Europe and Africa, fewer than 3.5% of people have such teeth.
Why do Tibetans have three-rooted molars?
In the case of present-day Tibetans, one snippet inherited from Denisovans helps them to live in the low oxygen environments of the Tibetan Plateau. The new study, published in the journal PNAS, suggests that the three-rooted molars in modern-day people also derive from Denisovans.
What is the 3rd molar called?
The third molars are also known as wisdom teeth. Maxillary third molar varies considerably in size, shape, and position in the dental arch. The crown of the maxillary third molar is smaller than the maxillary first and second molar. The roots are short and usually, they are fused.
Why do my molars have 3 roots?
Three-rooted molars could have come from Denisovans. A three-rooted lower first molar and its corresponding jaw in a recent Asian individual.
Do upper molars have 3 roots?
Most previous studies on maxillary molars have reported that these teeth usually have three roots and four canals since an extra canal is often found in the mesiobuccal root. Other anatomical variations in the form of an extra C-shaped canal have also been reported in distobuccal and palatal roots.
Which maxillary teeth have 3 roots?
The maxillary first premolar is the most commonly bi- rooted tooth with occasional presentation of three roots system; it is a transitional tooth between incisors and molars.
How rare is a molar with 3 roots?
Chen et al., (2019) Nature 569, 409–412], possesses an unusual dental feature: a 3-rooted lower second molar. A survey of the clinical and bioarchaeological literature demonstrates that the 3-rooted lower molar is rare (less than 3.5% occurrence) in non-Asian Homo sapiens.
Is it unusual for a tooth to have 3 roots?
Three roots in a lower molar are rare in modern humans. The overall prevalence in non-Asian people is about 3.5 percent. In Asian and Native American populations, though, the proportion of three-rooted molars rises to about 40 percent.
How many roots does maxillary 2nd molar have?
three rootsA maxillary second molar usually has three roots and three canals. The maxillary molar has been reported with various root canal anatomy having four roots [2], two roots [3, 4], and even a single root with a single canal [5]. The prevalence of a single canal in the maxillary molar is reported to be 0.5-0.6% [2, 5].
What causes extra roots in teeth?
In Turner syndrome, which is caused by monosomy or the partial absence of the X chromosome, characteristic extra multiroots are seen in the mandibular premolars. In monogenic disorders, oculo-facio-cardio -dental (OFCD) syndrome is associated with extremely long roots.
What roots are in maxillary molars?
Root canal morphology of maxillary molars It has three roots [mesiobuccal (MB), distobuccal (DB), and palatal (P)] with four canals.
Can a tooth have 3 root canals?
Although a dentist can do a second or third root canal treatment—or more—on a tooth, the results are unpredictable. Even the most skilled dentists can perform root canal treatment that fails. Studies show that root canal treatment has an 86 – 98% success rate.
Development and Root Completion of Maxillary Third molar
Following is the summary of the development and root completion of the maxillary third molar.
Buccal Aspect
The crown of the maxillary third molar is shorter cervico-occlusal and narrow mesiodistally as compared to maxillary first and second molars.
Mesial Aspect
The roots are considerably shorter as compared to the maxillary first and second molars.
Distal Aspect
The length of the crown on the distal aspect is a little less as compared to the crown length on the mesial aspect.
Occlusal Aspect
The most common outline form of the maxillary third molar is the heart shape type.
Development and Root Completion of Maxillary Third Molar
Buccal Aspect
- The crown of the third molar is shorter cervico-occlusal and narrow mesiodistally compared to maxillary first and second molars.
- There are two buccal cusps. The larger buccal cusp is the mesiobuccal cusp, and the smaller one is the distobuccal cusp.
- In between the two buccal cusps, the buccal developmental groove is present.
- The crown of the third molar is shorter cervico-occlusal and narrow mesiodistally compared to maxillary first and second molars.
- There are two buccal cusps. The larger buccal cusp is the mesiobuccal cusp, and the smaller one is the distobuccal cusp.
- In between the two buccal cusps, the buccal developmental groove is present.
- In the background, a single large cusp is presently called the lingual cusp.
Lingual Aspect
- A single large lingual cusp is present.
- The lingual surface of the maxillary third molar crown is smooth with no developmental groove or depression.
Mesial Aspect
- The roots are considerably shorter as compared to the maxillary first and second molars.
- The roots are fused.
- Sometimes bifurcation in the root is seen in the apical one-third portion of the root.
- The cervical line is nearly straight buccolingually.
Distal Aspect
- The length of the crown on the distal aspect is a little less as compared to the crown length on the mesial aspect.
- More of the occlusal surface of the tooth is visible from the distal aspect.
- Due to the taper of the crown on the distal side, most of the buccal surface of the crown is also visible from the distal aspect.
Occlusal Aspect
- The most common outline form of the maxillary third molar is the heart shape type.
- All three cusps are visible from the occlusal aspect.
- Two buccal cusps are the mesiobuccal cusp and the distobuccal cusp.
- A single large cusp on the lingual aspect is the lingual cusp.