In a new study published in the journal Proceedings of the National Academy of Sciences on July 8, researchers reported that the Denisovan hemimandible discovered in Xiahe, China features an interesting dental feature: a three-rooted lower second molar
The second molar
was impacted, and its distal root was severely dilacerated.
However, it is reported that there are different number of cusps and their degree of expression differs in dentition of different ethnic groups.3-5 It has been reported that in mandibular molars the buccal accessory cusps are very rare and existence of an oblique ridge even more rare in mandibular molars.6,7 Another study done on Australian natives has reported that maxillary first molar which forms early showed less variations than the cusps of maxillary second molar
A segmented archwire bent from 0.017x0.025" stainless steel archwire was inserted between the slot of the mini-screw and an auxiliary tube of the second molar
. Force (200g) was applied via a compressed open coil for second molar
The aim of this radiographical study was designed to determine the prevalence of decay on the second molar
as an effect of an impacted mandibular third molar in three different age groups.
The patient was admitted after wound debridement with hydrogen peroxide (1:4), and extraction of the right mandibular second molar
The patient visited a local dental surgeon, where he underwent extraction with respect to the upper-right second molar
. Unfortunately, the associated symptoms persisted as mild dull aching pain, which was intermittent nature.
In case if the second molar
is missing, those patients were excluded from the study.
Kim, "Mandibular second molar
root canal morphology and variants in a Korean subpopulation," International Endodontic Journal, vol.