scholarly journals Making Space for Permanent Molars in Growing Baboon (Papio anubis) and Great Ape (Pan paniscus and P. troglodytes) Mandibles: Possible Ontogenetic Strategies and Solutions

2011 ◽  
Vol 2011 ◽  
pp. 1-16 ◽  
Author(s):  
Julia C. Boughner
Keyword(s):  
Growth Rates ◽  
Pan Paniscus ◽  
Measurement Data ◽  
Linear Measurement ◽  
Postnatal Growth ◽  
Papio Anubis ◽  
Geometric Morphometric ◽  
Permanent Molar ◽  
Permanent Molars ◽  
Molar Morphology

While mandible proportions do not appear to constrain permanent molar initiation times, how adequate space is created in the corpus for these teeth in a timely way is not well understood. This question is important for explaining how primate tooth and jaw development and evolution are coordinated. Landmark and linear measurement data were used to characterize mandible shape, growth trajectory, and growth rate between two genera, Papio and Pan, with contrasting permanent molar initiation schedules and mandible proportions. 3D geometric morphometric and 2D bivariate analyses showed genus-level differences in mandible morphology from birth that were amplified by different postnatal growth trajectories. Different corpus proportions and regional variation in corpus growth rates helped create space in a timely way for the molars. Regional corpus growth rates may evolve alongside permanent molar morphology and developmental timing to modify space available in the corpus for these teeth.

Detection of early occlusal caries of the first permanent molar using different techniques (An in vivo study)

2019 ◽  
Vol 31 (1) ◽  
pp. 1-8
Author(s):  
Samah F. Al-Qazzaz ◽  
Abeer M. Hassan
Keyword(s):  
Sensitivity And Specificity ◽  
Visual Inspection ◽  
Caries Detection ◽  
Occlusal Caries ◽  
Clinical Sensitivity ◽  
Permanent Molar ◽  
Permanent Molars ◽  
Early Caries ◽  
First Permanent Molars ◽  
Better Than

Background: Molars and premolars are considered as the most vulnerable teeth of caries attack, which is related to the morphology of their occlusal surfaces along with the difficulty of plaque removal. different methods were used for early caries detection that provide sensitive, accurate preoperative diagnosis of caries depths to establish adequate preventive measures and avoid premature tooth treatment by restoration. The aim of the present study was to evaluate the clinical sensitivity and specificity rates of DIAGNOdent and visual inspection as opposed to the ICDAS for the detection of initial occlusal caries in noncavitated first permanent molars. Materials and Methods: This study examined 139 occlusal surface of the first permanent molar pooled from fifty patients aged 8-9 years by three methods. The selected criteria include one occlusal site per tooth (first permanent molars) with carious lesions range from 0 to 3 according to ICDASII (gold standard) visual criteria then the clinical sensitivity and specificity of visual inspection according to Ekstrand et al.in 1997 and DIAGNOdent were performed. . Results: the highest correlation was found between the ICDASII and DIAGNOdent. The sensitivity of the DIAGNOdent for the enamel caries detection (D1) was better than that of visual inspection. The sensitivity and the specificity for the DIAGNOdent at D3 threshold were better than the D1 threshold and the visual inspection method. Conclusion: DIAGNOden pen can be used as a tool for early caries detection in cases of difficult diagnosis that provide good additional sensitivity to the visual inspection.

scholarly journals Dental Sealant Composition-Retention Assessment in Young Permanent Molars

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1646
Author(s):  
Alexandrina Muntean ◽  
Codruta Sarosi ◽  
Sorina Sava ◽  
Marioara Moldovan ◽  
Andrei Ilie Condurache ◽  
...  
Keyword(s):  
Preventive Measures ◽  
Public Health Problem ◽  
Tooth Decay ◽  
Permanent Molar ◽  
Maxillary Molars ◽  
Dental Sealants ◽  
Dental Sealant ◽  
Permanent Molars ◽  
First Time ◽  
First Permanent Molars

Tooth decay in children and adolescents remains a public health problem, despite prophylaxis and preventive measures being largely available. The aim of our study was to evaluate the clinical behavior of four dental sealants, related to first permanent molar topography and patient age (when sealant was applied for the first time). We assessed, by means of visual inspection and palpation with a dental probe, a group of 200 children, enrolled corresponding to school age-grade (mean age of 7 years at baseline) and randomly divided according to the material used as dental sealant (Admira seal©, Embrace Wet Bond©, Fotoseal©, GC Fuji Triaje©) in 4 groups (n = 50). Sealant clinical evaluation was made at 6-, 12-, 18-month intervals for dental material retention assessment. At 6 months, the sealant detached the most from 3.6 molars, and the material used was Fotoseal© (27.6%). At 12 months, Fotoseal© (48.3%) and GC Fuji Triaje© (41.4%) from 3.6 molars express detachment. At 18 months, 4.6. molars sealed with Admira Seal© (25.7%) and Embrace Wet Bond© (28.6%) lost the sealant. We noticed less detachment in maxillary molars and if sealant was applied around 7 years of age. In conclusion, sealant application on first permanent molars must be encouraged and practitioners can choose between various materials available.

scholarly journals Influence of premature loss of the first permanent molar on the dental arches morphology – radiological evaluation

2017 ◽  
Vol 63 (4) ◽  
pp. 180-183
Author(s):  
Andreea Pop ◽  
◽  
Radu Septimiu Câmpian ◽  
Mariana Păcurar ◽  
Ecaterina Ionescu ◽  
...  
Keyword(s):  
Morphological Changes ◽  
Vertical Plane ◽  
Radiological Evaluation ◽  
Panoramic Radiographs ◽  
Permanent Molar ◽  
Permanent Molars ◽  
First Permanent Molars ◽  
Over Time

Objectives. The purpose of this research was to radiological identify the morphological changes of the dental arcades resulting from the premature loss of the permanent first molars. Material and method. The study was conducted between 2014-2016 on a group of 50 patients aged 12-15 years who presented themselves with the imminence of premature loss of the first permanent molars. 1: 1 panoramic radiographs were performed before the extractions and at 6 and 12 months after the extractions respectively. Results and discussions. The changes in position of the antagonist teeth and those of the second permanent molars, in the two dental arches, both in the sagittal and in the vertical plane were revealed. Conclusions. The premature loss of the first permanent molars, especially after the eruption of the second permanent molars, causes unwanted dental movements and severe dental-maxillary abnormalities over time.

scholarly journals Cone-beam computed tomography analysis on root and canal morphology of mandibular first permanent molar among multiracial population in East Coast Malaysian population

2018 ◽  
Vol 12 (03) ◽  
pp. 410-416 ◽  
Author(s):  
Prunella Ubung Deng ◽  
Mohamad Syahrizal Halim ◽  
Sam'an Malik Masudi ◽  
Saaid Al-Shehadat ◽  
Basaruddin Ahmad
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
East Coast ◽  
Cone Beam ◽  
Root Canals ◽  
Single Root ◽  
Malaysian Population ◽  
Permanent Molar ◽  
Permanent Molars ◽  
The Right

ABSTRACT Objective: The aim of this study is to investigate the variations in the number of root and canal in the mandibular first permanent molars (MFPMs) teeth in East Coast Malaysian population using cone-beam computed tomography (CBCT). Materials and Methods: CBCT images which show MFPMs recorded in HUSM Dental Clinic between January 2015 and June 2016 was obtained and analyzed for their number of roots and canals. A total of 208 CBCT images of MFPMs were collected; 118 patients had unilateral molars and 90 patients had bilateral molars. The following observations were made: (1) root number; (2) number of canals per root; and (3) comparisons of number of roots and canals according to gender, ethnicity, and position. Results: The majority of cases of bilateral MFPM had the same number of roots (95.6%, 95% confidence interval [CI]: 89.01%, 98.78%) on both the right and left side and only 4 cases (4.4%, 95% CI: 1.22%, 10.99%) had 3 roots on the right and 2 roots on the left sides. The majority of cases had the same number of canals on both sides (66.7%, 95% CI: 55.95, 76.26%) and 33.3% (95% CI: 23.74%, 44.05%) with unequal number of canals. The occurrence of the number of canals was not independent of the sides of the arch (P < 0.001) and there was statistically significantly greater proportion of cases who had greater number of canals on the right side than the left (P = 0.03). The prevalence of right single-rooted MFPM was very small at 0.3% (n = 1) in a Malay male (95% CI: 0.00, 1.83) and the most prevalent was two roots first molar (88.4%). The number of roots was not associated with sex or ethnic group (P > 0.05). The MFPM with a single root was found to have only one mesial canal. For two rooted MFPM, the most prevalent occurrence was two canals at the mesial and one canal at the distal roots (59%); followed by single canals in each mesial and distal (21%) and double canals per root (18%). Three roots MFPM have either single or double canals in the mesial root and double canals in the distal root. Conclusions: The majority of population in the East Coast region of Malaysia has two roots and three root canals in their MFPMs. There was no difference in the number of roots between gender and ethnic and canals between ethnic.

Achieving correction of a posterior scissorbite with a mini-screw

2020 ◽  
Vol 13 (1) ◽  
pp. 17-18
Author(s):  
Jason Matharu ◽  
Lucy Macey-Dare ◽  
James Dickson ◽  
Jerry Farrier
Keyword(s):  
Case Report ◽  
Clinical Relevance ◽  
Minimal System ◽  
Posterior Teeth ◽  
Permanent Molar ◽  
Adolescent Patients ◽  
Molar Teeth ◽  
Permanent Molars ◽  
Fixed Appliances

Scissorbite correction of posterior teeth can often be challenging. For adolescent patients, they may occur due to late eruption of the second permanent molar teeth after appliances are removed, or due to operator preference not to include them on the appliance. This case report describes a 17-year-old patient who had previously been treated with fixed appliances but did not originally have second permanent molars bonded. Complete correction of the scissorbite on the UR7 was effectively achieved in 14 weeks using a minimal system comprising only a palatal mini-screw, molar band and elastomeric chain. CPD/Clinical Relevance: Mini-screws placed in a palatal position can provide an effective way to correct posterior scissorbites.

Interannual variation in birth mass and postnatal growth rate of Juan Fernández fur seals

1998 ◽  
Vol 76 (5) ◽  
pp. 978-983 ◽  
Author(s):  
Hugo Ochoa-Acuña ◽  
John M Francis ◽  
Daryl J Boness
Keyword(s):  
Growth Rate ◽  
Body Mass ◽  
Growth Rates ◽  
Interannual Variation ◽  
Postnatal Growth ◽  
Male And Female ◽  
Fur Seals ◽  
Fur Seal ◽  
Attendance Pattern

The objectives of this study were to establish body mass at birth, postnatal growth rate, and the factors that influence these parameters for the Juan Fernández fur seal, Arctocephalus philippii. Females of this species have an unusual attendance pattern in which foraging trips and shore visits last, on average, 12.3 and 5.3 days, respectively. Pup mass was obtained from cohorts born during the reproductive seasons in 1988 through 1992. Birth masses of male and female pups were significantly different, averaging 6.1 and 5.5 kg, respectively (F = 13.2, P < 0.0003, n = 238). Birth masses also differed among cohorts, being lowest in 1992 and highest in 1990. During the first 2 months of life, male and female pups grew at the same rate (79 ± 61.5 g · day-1 (mean ± SD); F[1] = 0.03, P = 0.8562). Interannual differences in growth rate during the first month were significant (F[4] = 8.14, P < 0.0001), as was the interaction between month and year effects (F[2] = 6.81, P = 0.0012). Growth rates for the 1990 cohort were lower than those in all other years except 1992. Birth masses and postnatal growth rates of Juan Fernández fur seal pups are comparable to those of other otariid species.

scholarly journals Orthodontic Replacement of Lost Permanent Molar with Neighbor Molar: A Six-Year Follow-Up

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Taisa Boamorte Raveli ◽  
Ricardo Lima Shintcovsk ◽  
Luegya Amorim Henriques Knop ◽  
Luana Paz Sampaio ◽  
Dirceu Barnabé Raveli
Keyword(s):  
Female Patient ◽  
Adult Female ◽  
Treatment Time ◽  
Facial Aesthetics ◽  
Permanent Molar ◽  
Space Closure ◽  
Permanent Molars ◽  
Sliding Mechanics ◽  
Adult Female Patient

Extraction is very frequent indication in orthodontic planning, especially when there are crowding, biprotrusion, and aesthetically unpleasant profiles. Next to extraction comes space closure, which represents a challenge for orthodontists because of extended treatment time, discomfort created for the patient, tissue tolerance, and stability concerns. When it comes to what mechanics to choose for space closure, loops present two major advantages in relation to sliding mechanics: absence of abrasion and possibility to reach pure dental translation. A case is presented where an adult female patient with early loss of the first lower permanent molars, minor lower crowding, and tooth biprotrusion was treated with upper first bicuspids extraction along with upper and lower space closure done with T-loops to promote best space closure control in order to correct the malocclusion and enhance facial aesthetics.

Morphological assessment of the earliest paradoxidid trilobites (Cambrian Series 3) from Morocco and Spain

2017 ◽  
Vol 155 (7) ◽  
pp. 1566-1595 ◽  
Author(s):  
J. JAVIER ÁLVARO ◽  
JORGE ESTEVE ◽  
SAMUEL ZAMORA
Keyword(s):  
New Species ◽  
Statistical Analysis ◽  
Iberian Peninsula ◽  
Linear Measurement ◽  
Geometric Morphometric ◽  
Middle Cambrian ◽  
West Gondwana ◽  
Regional Correlation ◽  
Definition Of ◽  
Morphological Assessment

AbstractA Cambrian immigration event of paradoxidid trilobites has traditionally marked some regional lower–middle Cambrian boundaries in the Acado-Baltic subprovince (including Baltica and the Mediterranean and Avalonian margins of West Gondwana). The earliest paradoxidine species in Morocco and the Iberian Peninsula have been used as a chronostratigraphic link to support the definition of a common base for the Cambrian Series 3, but recent studies have proposed new species without revising previously established ones. This paper offers a morphological statistical analysis based on both linear measurement and landmark-based geometric morphometric approaches performed on the earliest paradoxinine trilobites sampled in the Anti-Atlas (Morocco) and the Iberian Chains (Spain). As a result, the diagnosis of Acadoparadoxides mureroensis is emended and several species recently erected in Morocco (A. cf. mureroensis, A. levisettii, A. ovatopyge and A. pampalius) are suggested as synonyms of A. mureroensis until 3D statistical analyses are available based on material preserved on carbonate or silica nodules. The first appearance of A. mureroensis in both areas can be provisionally used for regional correlation until homotaxic tests are checked.

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