Translational movement of first deciduous molars into second molar positions

1969 ◽  
Vol 55 (3) ◽  
pp. 276-285 ◽  
Author(s):  
J.Rodney Mathews
Keyword(s):  
Second Molar ◽  
Translational Movement ◽  
Deciduous Molars

Morphological Variation of the Baka Pygmies’ Deciduous Second Molars 

2021 ◽  
Author(s):  
Petra G. Šimková ◽  
Gerhard W. Weber ◽  
Fernando Ramirez-Rozzi ◽  
Lotfi Slimani ◽  
Jérémy Sadoine ◽  
...  
Keyword(s):  
Distal Region ◽  
Dental Morphology ◽  
Second Molar ◽  
Natural Logarithm ◽  
Dental Crowns ◽  
Human Sample ◽  
Molar Morphology ◽  
South Americans ◽  
Deciduous Molars ◽  
General Size

Abstract The Baka pygmies are known for their short stature resulting from a reduced growth rate during infancy. They are peculiar also for their teeth erupt earlier than in any other African population, and their posterior dentition is larger than in non-pygmies. However, the Baka’s dental morphology, as several other aspects of their biology, is still understudied. In this study we explore the Baka’s upper and lower second deciduous molars variation in comparison to a human sample including Africans, Asians, Europeans, and South Americans by means of 3D geometric morphometrics. We analyzed both the outer and inner aspect of the dental crowns, as well as their general size based on the natural logarithm of centroid sizes. Our results show largely overlapping morphologies between populations, especially for the lower molars. The distal region of the second molars is the most variable, with the Baka’s lower second molars showing the most extreme range of variation for this aspect and in terms of crown height. Upper and lower second molars showed high morphological covariation (RV=0.82). The Baka and South Americans’ second molars were confirmed among the largest in our sample. Despite of the Baka’s particular growth pattern, long-lasting isolation and extreme dental variation, it is not possible to distinguish them from other populations on the basis of their second molar morphology only.

Treatment of Class II Division 1 with Impacted Mandibular Right Second Molar Using Microimplant

2019 ◽  
Vol 9 (4) ◽  
pp. 238-248
Author(s):  
Sun-mi Lee ◽  
Seong-Ryeol Bae ◽  
Hee-Moon Kyung ◽  
Mi-hee Hong ◽  
Hyo-Sang Park
Keyword(s):  
Class Ii ◽  
Second Molar ◽  
Division 1 ◽  
Class Ii Division 1

Astounding Root Canal Anatomy of A Manibular Second Molar – A Case Report

2011 ◽  
Vol 3 (9) ◽  
pp. 417-418
Author(s):  
Dr Veerendra M Uppin ◽  
◽  
Dr Priyanka Sarangi ◽  
Dr Sukanta Kumar Satapathy
Keyword(s):  
Case Report ◽  
Root Canal ◽  
Second Molar ◽  
Root Canal Anatomy

Axial Triangle of the Maxillary Sinus, and its Surgical Implication With the Position of Maxillary Sinus Septa During Sinus Floor Elevation: A CBCT Analysis

2020 ◽  
Vol 46 (4) ◽  
pp. 415-422
Author(s):  
Junho Jung ◽  
Jung Soo Park ◽  
Seoung-Jin Hong ◽  
Gyu-Tae Kim ◽  
Yong-Dae Kwon
Keyword(s):  
Maxillary Sinus ◽  
Surgical Techniques ◽  
Lateral Sinus ◽  
Sinus Floor Elevation ◽  
Second Molar ◽  
Sinus Wall ◽  
Posterior Maxilla ◽  
Significant Difference ◽  
Sinus Floor ◽  
Molar Region

The aim of this study was to measure the convexity of the lateral wall of the maxillary (Mx) sinus and identify the locational distribution of antral septa in relation to the zygomaticomaxillary buttress (ZMB), in order to suggest another anatomical consideration and surgical modification of sinus floor elevation procedures. This study was designed as a cross-sectional study, and a total of 134 patients and 161 sinuses containing edentulous alveolar ridges were analyzed. The angle between the anterior and lateral walls of the Mx sinus (lateral sinus angle [LSA]), and the angle between the midpalatal line and the anterior sinus wall (anterior sinus angle [ASA]) were measured. Mean LSAs and ASAs were 105.9° ± 9.86° and 58.4° ± 6.43°, respectively. No significant difference between left and right sides was found (LSA, P = .420; right = 105.5° ± 9.27°; left = 105.5° ± 9.27° and ASA, P = .564; right = 57.9° ± 6.80°; left = 58.8° ± 6.02°). The prevalence of septa was 37.3%, and it was most frequently noted in the second molar region (32.8%), followed by the first molar (20.9%), retromolar (16.4%), and second premolar regions (14.9%). Septa were most frequently located posterior to the ZMB (49.2%), while ZMB was mostly located in the first molar region (66.4%). Narrow LSAs may complicate the surgical approach to the posterior maxilla, especially when sinus elevation should be used in the second molar region. Considering the occasional presence of antral septa, membrane elevation may be complicated when a septum is encountered during the procedure. These results suggest that 3-dimensional examination of the convexity of the Mx sinus should be performed preoperatively to choose proper surgical techniques and minimize surgical complications.

Avaliação da prevalência da perda precoce de molares decíduos na dentição mista

2020 ◽  
Vol 13 (52) ◽  
pp. 102-106
Author(s):  
Ana de Lourdes Sá de Lira ◽  
Cassius Wander Coelho Martins ◽  
Luis Paulo da Silva Dias ◽  
Tito Cacau Sousa Santos
Keyword(s):  
Mixed Dentition ◽  
Deciduous Teeth ◽  
Chi Square ◽  
Space Maintainer ◽  
Chi Square Test ◽  
Fixed Space ◽  
Deciduous Molar ◽  
One Year ◽  
Deciduous Molars ◽  
Lower Arch

Objective: To assess primary molars early loss in mixed dentition prevalence. Method: A study was carried out in children aged 6 to 12 years. Deciduous molar loss was considered early when it occurred before Nolla stage 6 (full formed crown) of the permanent successor or one year before its physiological exfoliation. Periapical radiographs were obtained to verify the presence of the permanent successor and the level of root formation, as well as the need for placement of fixed space maintainer lingual arch or Nance button. For the study of frequency distribution of early dental loss in relation to gender and dentition, we used the Chi-square test of 5% probability level and the non-parametric Mann-Whitney test for adequate statistical analysis. Results: Of the 315 children examined, 159 (50.47%) were male and 156 (49.52%) were female. Only 25 (7.9%) presented multiple dental losses in the posterior region, 19 in the lower arch and 6 in the upper arch. In the inferior one there was predominance of first and second deciduous molars loss. There was no difference in the association between genders and the occurrence of multiple dental losses (χ² (1) = 0.03, p>0.05). Conclusion: The prevalence of deciduous teeth premature loss was of 7.9% and the most affected teeth were the first and second molars in the lower arch. Lingual arch space holders were installed in 6 children, who will remain with it until the permanent successors erupt into the oral cavity.

A Rare Case of Congenital Missing Mandibular Second Molar: Report and Review of Literature

2020 ◽  
Author(s):  
Deepashri H Kambalimath
Keyword(s):  
Tooth Development ◽  
Rare Condition ◽  
Review Of Literature ◽  
Indian Literature ◽  
Missing Teeth ◽  
Second Molar ◽  
The World ◽  
Mandibular Second Molar ◽  
Sporadic Cases ◽  
Genetic And Environmental Factors

Congenital missing permanent second molar is an extremely rare condition. Non syndromic mandibular second molar agenesis associated with other anomalies has occasionally been reported in literature, but isolated sporadic cases are rarely observed. Number of interactions between genetic and environmental factors during the process of tooth development might be the causative etiology for agenesis. This report presents an isolated case of hypodontia with absence of bilateral mandibular second molar agenesis in a healthy 18 year old female patient is presented and literature review on prevalence of most missing teeth with incidence of missing second molar in various regions of the world and in various regions of Indian continent is presented. No such case has been reported in Indian literature so far.

scholarly journals Comparison of one versus two maxillary molars distalization with iPanda: a finite element analysis

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Kamontip Sujaritwanid ◽  
Boonsiva Suzuki ◽  
Eduardo Yugo Suzuki
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Alveolar Bone ◽  
Vertical Direction ◽  
Minimal Amount ◽  
Element Analysis ◽  
Molar Distalization ◽  
Second Molar ◽  
Maxillary Molars ◽  
Displacement Patterns

Abstract Background The purpose of this study was to compare the stress distribution and displacement patterns of the one versus two maxillary molars distalization with iPanda and to evaluate the biomechanical effect of distalization on the iPanda using the finite element method. Methods The finite element models of a maxillary arch with complete dentition, periodontal ligament, palatal and alveolar bone, and an iPanda connected to a pair of midpalatal miniscrews were created. Two models were created to simulate maxillary molar distalization. In the first model, the iPanda was connected to the second molar to simulate a single molar distalization. In the second model, the iPanda was connected to the first molar to simulate “en-masse” first and second molar distalization. A varying force from 50 to 200 g was applied. The stress distribution and displacement patterns were analyzed. Results For one molar, the stress was concentrated at the furcation and along the distal surface in all roots with a large amount of distalization and distobuccal crown tipping. For two molars, the stress in the first molar was 10 times higher than in the second molar with a great tendency for buccal tipping and a minimal amount of distalization. Moreover, the stress concentration on the distal miniscrew was six times higher than in the mesial miniscrew with an extrusive and intrusive vector, respectively. Conclusions Individual molar distalization provides the most effective stress distribution and displacement patterns with reduced force levels. In contrast, the en-masse distalization of two molars results in increased force levels with undesirable effects in the transverse and vertical direction.

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