New Dental Finds Associated with the Paleolithic Selenga Culture, Western Trans-Baikal Region

2019 ◽  
Vol 47 (3) ◽  
pp. 3-11 ◽  
Author(s):  
G. D. Pavlenok ◽  
A. V. Zubova
Keyword(s):  
Baikal Region ◽  
Upper Paleolithic ◽  
Morphological Comparison ◽  
Human Teeth ◽  
Radiocarbon Dates ◽  
Considerable Similarity ◽  
Second Molar ◽  
Permanent Molar

We describe human teeth discovered in 2012 during the re-examination of the collection from Ust-Kyakhta-3 in the western Trans-Baikal region, excavated by A.P. Okladnikov. This is one of the key Final Paleolithic sites in this area, having a distinct twolayer stratigraphy, a non-contradictory series of radiocarbon dates, and the largest (and the most representative) collection of artifacts. Human teeth come from layer 1, whose dates range from 11,505 ± 100 to 12,151 ± 58 BP. Finds include fragments of a deciduous left upper second molar of a child aged 11–13 and an incompletely erupted upper permanent molar, possibly of the same child. Morphological comparison of these teeth with those from Malta in the Cis-Baikal region demonstrates considerable similarity. The fi nding suggests that the populations of Malta and Ust-Kyakhta-3 represent one and the same southern Siberian Upper Paleolithic dental complex.

scholarly journals DECIDUOUS HUMAN TEETH FROM THE UPPER PALEOLITHIC SITE OF YUDINOVO, WESTERN RUSSIA

2018 ◽  
Vol 46 (3) ◽  
pp. 138-145 ◽  
Author(s):  
A. V. Zubova ◽  
V. G. Moiseyev ◽  
G. A. Khlopachev ◽  
A. M. Kulkov
Keyword(s):  
Principal Component ◽  
Upper Paleolithic ◽  
Deciduous Teeth ◽  
Northern Eurasia ◽  
Paleolithic Site ◽  
Human Teeth ◽  
Second Molar ◽  
Nonmetric Traits ◽  
Computed Microtomography ◽  
Weak Expression

Population affinities of the Timonovka-Yudinovo Upper Paleolithic people are reconstructed on the basis of three isolated deciduous teeth––a lower lateral incisor, lower and upper second molars, likely representing three individuals––from Yudinovo in the middle Desna basin (15–12 ka BP), found in 1987–1996. Based on measurements and descriptive traits and computed microtomography, the teeth were compared with those from other Upper Paleolithic sites in northern Eurasia. The principal component analyses of metric and nonmetric traits revealed similar patterns. To minimize random variation, results of both analyses were integrated. Results indicate affi nity with Pavlov people in Central Europe. The diagnostic trait combination includes weak expression of the Carabelli cusp on the upper second molar, accessory sixth cusp on the lower second molar, large bucco-lingual diameter of both molars, and moderate mesio-distal diameter of the lower second molar. These results support the view that the Timonovka-Yudinovo tradition is related to eastern Gravette.

Incidence of Lower Second Permanent Molar Impaction

1988 ◽  
Vol 15 (3) ◽  
pp. 199-203 ◽  
Author(s):  
Ruth Evans
Keyword(s):  
Deciduous Teeth ◽  
Control Group ◽  
Second Molar ◽  
Permanent Molar ◽  
Two Samples ◽  
Orthodontic Patients

The incidence of lower second molar impaction was investigated, comparing the records of two samples of 200 orthodontic patients referred consecutively, in 1976 and 1986. A further study compared 50 cases showing both bilateral and unilateral impactions, with a non-impacted control group. This allowed possible causes of the impactions to be examined, particularly concerning the effect of premature loss of deciduous teeth on the distribution of crowding.

scholarly journals Endodontic treatment of a mandibular hypertaurodontic second molar

2015 ◽  
Vol 63 (2) ◽  
pp. 203-206
Author(s):  
Emmanuel João Nogueira Leal SILVA ◽  
Plínio Mendes SENNA ◽  
Tauby de Souza COUTINHO FILHO ◽  
Renato Liess KREBS
Keyword(s):  
Anatomical Variations ◽  
Endodontic Treatment ◽  
Study Objective ◽  
Second Molar ◽  
Clinically Normal ◽  
Permanent Molar ◽  
Root Sheath ◽  
Molar Teeth ◽  
Root Canal System ◽  
Apical Displacement

Taurodontism is the consequence of a developmental disorder in which the invagination of Hertwig's epithelial root sheath doesn't occur at a proper level. As a result, the pulp body and the chamber of a multi-root tooth, usually permanent molar teeth, are enlarged by the apical displacement of the pulp floor. Despite its clinically normal appearance, the morphological variation of this tooth can be diagnosed by a routine radiographic exam that shows enlarged apico-occlusal pulp chamber and short roots. Due to these anatomical variations, endodontic treatment of a taurodontic element is a clinical challenge given the complexity of localization and instrumentation of the root canal system. According to the degree of displacement of the pulp floor, taurodontism can be classified as: hypotaurodontism, mesotaurodontism and hypertaurodontism. This study objective is to report a clinical case of a patient who was submitted to endodontic treatment of the second inferior molar affected by hypertaurodontism.

scholarly journals Association between arch perimeter management and the occurrence of mandibular second molar eruption disturbances:

2021 ◽  
Author(s):  
Lucas Garcia Santana ◽  
Kimberlly Avelar ◽  
Leandro Silva Marques
Keyword(s):  
Randomized Clinical Trials ◽  
Treatment Time ◽  
Risk Of Bias ◽  
Second Molar ◽  
Mandibular Arch ◽  
Assessment Development ◽  
Permanent Molar ◽  
High Prevalence ◽  
Mandibular Second Molar ◽  
Meta Analyses

ABSTRACT Objectives To investigate the association between the management of mandibular arch perimeter during development of the dentition and its effects on second permanent molar (M2) eruption. Materials and Methods Seven electronic databases were searched without restrictions up to June 2020. Assessment was performed using the Risk Of Bias In Non-randomized Studies of Interventions (ROBINS-I) tool for non-randomized clinical trials (non-RCT). Odds ratio (OR) with 95% confidence intervals was calculated from random-effects meta-analyses. The Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) tool was used to assess the certainty of the evidence. Results Five non-RCTs, with serious to moderate risk of bias, were included. A low certainty of evidence indicated that individuals undergoing mandibular arch perimeter management by controlling the position of the first molar had a high prevalence of M2 eruption difficulties. The odds of eruption disorders was 7.5 times higher (OR: 7.57, [3.72, 15.41], P < .001) in treated individuals. Subgroup analysis revealed that appliances that increased the arch perimeter lead to a greater chance of eruption disorders compared to appliances that only maintained the perimeter. The predictive factors for the M2 eruption difficulty were its previous mesioangulation in relation to the first molar (>24°) and the treatment time (>2 years). Conclusions Mandibular arch perimeter management during development of the dentition leads to an increase in the occurrence of M2 eruption difficulties. The identification of possible risk factors as well as the choice of the appropriate appliance type and the monitoring of these individuals seems to be essential to avoid undesirable effects with this therapy.

scholarly journals Chronology of Prehistoric Cultural Complexes of Sakhalin Island (Russian Far East)

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 353-362 ◽  
Author(s):  
Yaroslav V Kuzmin ◽  
Alexander A Vasilevski ◽  
Sergei V Gorbunov ◽  
G S Burr ◽  
A J Timothy Jull ◽  
...  
Keyword(s):  
Middle Ages ◽  
Iron Age ◽  
Russian Far East ◽  
Far East ◽  
Sakhalin Island ◽  
Upper Paleolithic ◽  
Early Iron Age ◽  
Radiocarbon Dates ◽  
Continuous Sequence ◽  
The Middle Ages

A chronological framework for the prehistoric cultural complexes of Sakhalin Island is presented based on 160 radiocarbon dates from 74 sites. The earliest 14C-dated site, Ogonki 5, corresponds to the Upper Paleolithic, about 19,500–17,800 BP. According to the 14C data, since about 8800 BP, there is a continuous sequence of Neolithic, Early Iron Age, and Medieval complexes. The Neolithic existed during approximately 8800–2800 BP. Transitional Neolithic-Early Iron Age complexes are dated to about 2800–2300 BP. The Early Iron Age may be dated to about 2500–1300 BP. The Middle Ages period is dated to approximately 1300–300 BP (VII–XVII centuries AD).

scholarly journals Treatment of Ectopic Mandibular Second Permanent Molar with Elastic Separators

2014 ◽  
Vol 2014 ◽  
pp. 1-4
Author(s):  
R. Rajesh ◽  
V. Naveen ◽  
S. Amit ◽  
Kusai Baroudi ◽  
C. Sampath Reddy ◽  
...  
Keyword(s):  
Case Report ◽  
Second Molar ◽  
Permanent Molar ◽  
Ectopic Eruption ◽  
Surgical Exposure ◽  
Developmental Disturbance

Ectopic eruption is a developmental disturbance in which the tooth fails to follow its normal eruption pathway. Ectopic eruption of the second molar is relatively rare. This paper presents the case of thirteen-year-old male with an ectopic mandibular second permanent molar. The condition was corrected with surgical exposure and placement of elastic separators. This case report lays emphasis on the practice of basic methods to obtain acceptable results rather than extensive surgical or orthodontic corrections. It is advised that ectopic teeth should not be neglected especially when it concerns developing caries and malocclusion.

Radiocarbon Dates From the Upper Paleolithic of the Barma Grande

1996 ◽  
Vol 37 (1) ◽  
pp. 156-162 ◽  
Author(s):  
Michael S. Bisson ◽  
Nadine Tisnerat ◽  
Randall White
Keyword(s):  
Upper Paleolithic ◽  
Radiocarbon Dates

scholarly journals A genetic method for dating ancient genomes provides a direct estimate of human generation interval in the last 45,000 years

2016 ◽  
Vol 113 (20) ◽  
pp. 5652-5657 ◽  
Author(s):  
Priya Moorjani ◽  
Sriram Sankararaman ◽  
Qiaomei Fu ◽  
Molly Przeworski ◽  
Nick Patterson ◽  
...  
Keyword(s):  
Upper Paleolithic ◽  
Direct Estimate ◽  
Radiocarbon Dates ◽  
Genetic Method ◽  
Generation Interval ◽  
Neanderthal Admixture ◽  
The Common ◽  
The Mean ◽  
The Difference ◽  
Age Estimates

The study of human evolution has been revolutionized by inferences from ancient DNA analyses. Key to these studies is the reliable estimation of the age of ancient specimens. High-resolution age estimates can often be obtained using radiocarbon dating, and, while precise and powerful, this method has some biases, making it of interest to directly use genetic data to infer a date for samples that have been sequenced. Here, we report a genetic method that uses the recombination clock. The idea is that an ancient genome has evolved less than the genomes of present-day individuals and thus has experienced fewer recombination events since the common ancestor. To implement this idea, we take advantage of the insight that all non-Africans have a common heritage of Neanderthal gene flow into their ancestors. Thus, we can estimate the date since Neanderthal admixture for present-day and ancient samples simultaneously and use the difference as a direct estimate of the ancient specimen’s age. We apply our method to date five Upper Paleolithic Eurasian genomes with radiocarbon dates between 12,000 and 45,000 y ago and show an excellent correlation of the genetic and 14C dates. By considering the slope of the correlation between the genetic dates, which are in units of generations, and the 14C dates, which are in units of years, we infer that the mean generation interval in humans over this period has been 26–30 y. Extensions of this methodology that use older shared events may be applicable for dating beyond the radiocarbon frontier.

Maxillary first permanent molar impaction. A conservative treatment approach

2006 ◽  
Vol 30 (2) ◽  
pp. 169-173
Author(s):  
Susana Maria Deon Rizzatto ◽  
Luciane Macedo de Menezes ◽  
Marcus Vinicius Neiva Nunes do Rego ◽  
Guilherme Thiesen ◽  
Vanessa Pereira de Araujo ◽  
...  
Keyword(s):  
Conservative Treatment ◽  
Clinical Case ◽  
Treatment Approach ◽  
Second Molar ◽  
Early Loss ◽  
Permanent Molar ◽  
Permanent Molars ◽  
Orthodontic Bonding ◽  
First Permanent Molars

The objective of this clinical case is to suggest a treatment approach for impaction of the maxillary first permanent molars. This approach allows access to the partially erupted tooth for orthodontic bonding and utilization of loops for distalization. An important detail is the non inclusion of the primary second molar in the orthodontic mechanics, in order to reduce the risk of early loss and preserve this tooth until exfoliation.

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