Full Answer
How many canals are in a 2 root molar?
The two-rooted molar usually has a canal configuration of three canals; two canals in the mesial root and one in the distal root ( Fig. 1.77 ). The canal configuration in the mesial root is type 3 in 55–85% according to different reports and type 2 in the remainder.
What is a mandibular first molar root?
Mandibular first molars usually have two roots (Fig. 1.74 ), one mesial and one distal. The mesial root exits the crown in a mesial direction and then gradually curves distally in the apical third. The distal root is narrower buccolingually but equal in mesiodistal width compared to the mesial root. The distal root often curves mesially.
What percentage of molars in Brazil have canals?
76%-13%-8%-3% 1-2-3-4 canals in distal root of two rooted molars. 100 extracted Brazilian teeth micro-CT JOE 2015 Filpo-Perez Interestingly 13% had canal systems not in Vertucci classification and are IMHO very complex. First molar = Systemic Review with 41 studies and almost 19k molars. de Pablo 2010 JOE
How common are distolingual roots in mandibular first molars?
In a review, Abella et al. [32] described a frequency of 14.4 % regarding distolingual roots in mandibular first molars. There was an association to specific ethnic populations. The additional root was found more frequently in populations with Mongolian origin, like Chinese, Inuit, and Native Americans [32].
How many roots does a mandibular first molar have?
Mandibular first molars. Mandibular first molars usually have two roots (Fig. 1.74 ), one mesial and one distal. The mesial root exits the crown in a mesial direction and then gradually curves distally in the apical third. The distal root is narrower buccolingually but equal in mesiodistal width compared to the mesial root.
What is the radiolucency of the first molar?
Several teeth have been heavily restored. The lower first molar is root filled, and there is a poorly defined radiolucency about 2 cm in length extending from the distal root of the second molar to the premolar socket. The cortical bone outline of the inferior dental canal cannot be seen in this region. The recent extraction socket still has the lamina dura present, although it appears slightly more indistinct than normal, consistent with infection or another process causing resorption. No sequestra or root fragments are present in the socket, although a plain periapical view would have been a better view to assess this particular point because it provides higher resolution.
What is the canal configuration of a mesial root?
The two-rooted molar usually has a canal configuration of three canals; two canals in the mesial root and one in the distal root ( Fig. 1.77 ). The canal configuration in the mesial root is type 3 in 55–85% according to different reports and type 2 in the remainder. The mesiobuccal canal is the most difficult canal to treat because of its tortuous path. It leaves the pulp chamber in a mesial direction, which alters to a distal direction in the middle of the root. From the proximal perspective, the mesiobuccal canal curves to the buccal first and then lingually. The coronal part of the mesiolingual canal is straighter and then curves buccally in the middle third.
How many cusps are in a lower molar?
Lower first molar (M 1) crowns have five well-developed cusps usually arranged in the classic Y-5 pattern. Lower third molars (M 3) usually have four or fewer cusps with more variable arrangement. Lower third molars (M 3) tend to be smaller and more crenulate than first molars, with more irregular cusp positioning relative to the major crown axes. Lower second molar (M 2) crowns are intermediate to the first and third molar crowns in morphological attributes.
Where is the BBC cyst located?
A BBC is most commonly located in association with a mandibular first molar followed by the second molar. The cyst occasionally is bilateral. It is always located in the buccal furcation of the affected molar (Fig. 21-11 ). On periapical and panoramic films, the lesion may appear to be centered a little distal to the furcation of the involved tooth.
Which molar is rhombic?
The maxillary second molar is rhombic in shape with its two acute angles occurring in the mesiobuccal and distopalatal corners and its obtuse angles occurring in the remaining corners.
Where are the orifices of the mesial and distal canals located?
The orifices of both mesial and distal canals lie in the mesial two-thirds of the crown, hence the access cavity is located in this part of the crown. The two-rooted molar usually has a canal configuration of three canals; two canals in the mesial root and one in the distal root ( Fig. 1.77 ).
How many studies are there in the first molar?
First molar = Systemic Review with 41 studies and almost 19k molars. de Pablo 2010 JOE
What percentage of isthmus communication is on the mesial root?
Isthmus communications 55% on mesial root and 20% on distal root.
What is the percentage of communication on the isthmus?
Isthmus communications = 55% on mesial and 20% on distal root. What is an isthmus and what is a canal? Depends on age likely. In the young it is a canal in the elderly an isthmus.
Is there a post on the mid mesial canal?
There is an entire post on the mid mesial canal.
How many roots are there in a maxillary first molar?
A maxillary first molar has typically three separate roots and in only about 4 % of the cases just two roots are found. Two or more merged roots occur in about 5 % of all cases. The presence of four roots is extremely rare [ 15 ]. In second maxillary molars, merging of roots is much more common.
Who was the first to relate age and gender of the patients to root canal complexity?
In 1917, Walter Hess [ 14] presented the anatomical complexities with multitude of branches and accessory canals by illustrating in detail the number and formation of root canals. He was the first to relate age and gender of the patients to root canal complexity.
