The Relationship between the Angulation of the Roots and the Rate of Approximal Drift of Cheek Teeth in Adult Monkeys

1974 ◽  
Vol 1 (3) ◽  
pp. 105-110 ◽  
Author(s):  
D. C. A. Picton ◽  
J. P. Moss
Keyword(s):  
Soft Tissues ◽  
Horizontal Distance ◽  
Normal Occlusion ◽  
The Relationship

The angulation of the roots of cheek teeth in nine adult monkeys ( Macaca irus) were measured from lateral radiographs taken after death. The angle formed by seventy pairs of teeth was compared with the horizontal distance these teeth were known to have migrated relative to each other during the last few weeks of life. It was found that no significant correlation was present between these parameters nor with the direction of horizontal drift. This was true when the teeth were in normal occlusion, the opposing teeth were extracted or the interdental soft tissues were scraped away. This evidence together with specimens of mammalian skulls showing lack of association of angulation of the roots and presence or absence of approximal contacts indicates that the inclination of the roots is not an important factor in the causation of approximal drift in adult animals.

Surgical Anatomy for Extended Facelift Techniques

2020 ◽  
Vol 36 (03) ◽  
pp. 309-316
Author(s):  
Ozcan Cakmak ◽  
Ismet Emrah Emre
Keyword(s):  
Facial Nerve ◽  
Soft Tissues ◽  
Extended Techniques ◽  
Surgical Anatomy ◽  
Superficial Musculoaponeurotic System ◽  
Increased Risk ◽  
The Face ◽  
Facial Soft Tissues ◽  
Relationship Of ◽  
The Relationship

AbstractPreservation of the facial nerve is crucial in any type of facial procedure. This is even more important when performing plastic surgery on the face. An intricate knowledge of the course of the facial nerve is a requisite prior to performing facelifts, regardless of the technique used. The complex relationship of the ligaments and the facial nerve may put the nerve at an increased risk of damage, especially if its anatomy is not fully understood. There are several danger zones during dissection where the nerve is more likely to be injured. These include the areas where the nerve branches become more superficial in the dissection plane, and where they traverse between the retaining ligaments of the face. Addressing these ligaments is crucial, as they prevent the transmission of traction during facelifts. Without sufficient release, a satisfying pull on the soft tissues may be limited. Traditional superficial musculoaponeurotic system techniques such as plication or imbrication do not include surgical release of these attachments. Extended facelift techniques include additional dissection to release the retaining ligaments to obtain a more balanced and healthier look. However, these techniques are often the subject of much debate due to the extended dissection that carries a higher risk of nerve complications. In this article we aim to present the relationship of both the nerve and ligaments with an emphasis on the exact location of these structures, both in regard to one another and to their locations within the facial soft tissues, to perform extended techniques safely.

scholarly journals The prevalence of malocclusion among 7–15-year-old Lithuanian schoolchildren

Medicina ◽  
2009 ◽  
Vol 45 (2) ◽  
pp. 147 ◽  
Author(s):  
Antanas Šidlauskas ◽  
Kristina Lopatienė
Keyword(s):  
Important Determinant ◽  
Age Groups ◽  
Epidemiological Data ◽  
Dental Arch ◽  
Class Iii ◽  
Posterior Crossbite ◽  
Normal Occlusion ◽  
Dental Crowding ◽  
Relationship Of ◽  
The Relationship

The epidemiological data on the prevalence of malocclusion is an important determinant in planning appropriate levels of orthodontic services. The occurrence of occlusal anomalies varies between different countries, ethnic and age groups. The aim of this study was to describe the prevalence of malocclusion among Lithuanian schoolchildren in the 7–9-, 10– 12-, and 13–15-year age groups assessing occlusal morphology. The study included 1681 schoolchildren aged 7–15 years. The crowding, spacing, overbite, overjet, the relationship of the first upper and lower molars according Angle’s classification, and posterior crossbite were assessed. The study demonstrated that only 257 children had normal occlusion, and 44 had undergone orthodontic treatment among them. The greatest overjet in the studied contingent was 11 mm, and the negative overjet – 3 mm. The overbite ranged between 0 and 6 mm with a mean of 2.29±1.23 mm. Posterior crossbite was recorded in 148 children (8.8%). This study showed that the prevalence of malocclusion among 7–15-year-old Lithuanian schoolchildren is 84.6%. The most common malocclusion was dental crowding. The upper dental arch crowding was registered for 44.1% and lower for 40.3% of all schoolchildren. The class I molar relationship was detected in 68.4% of the subjects, class II – in 27.7%, and class III – in 2.8%.

scholarly journals Mandibular prognathism attenuates brain blood flow induced by chewing

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Hiroyuki Kanzaki ◽  
Satoshi Wada ◽  
Masao Kumazawa ◽  
Yuko Yamada ◽  
Tomomi Sudo ◽  
...  
Keyword(s):  
Blood Flow ◽  
Brain Function ◽  
Near Infrared ◽  
Inferior Frontal Gyrus ◽  
Brain Blood Flow ◽  
Functional Near Infrared Spectroscopy ◽  
Mandibular Prognathism ◽  
Normal Occlusion ◽  
Calculation Task ◽  
The Relationship

AbstractMastication is closely related to brain function. Animal experiments have revealed that tooth loss has a negative influence on brain function. Clinical studies also suggest that normal occlusion is an essential factor for favorable brain function. Mandibular prognathism (MP) usually results in occlusal dysfunction. However, the relationship between MP and brain function remains unclear. In the present study, we examined the relationship between MP and brain function by measuring brain blood flow (BBF). Seventeen subjects with normal occlusion (NORM) and 25 patients with MP participated in this study. The number of occlusal contacts were counted. Electromyography of the masseter muscles during clenching was also recorded. BBF was measured with non-invasive functional near-infrared spectroscopy during calculation task and chewing task. The number of the occlusal contacts and masseter muscle activity were lower in MP compared with NORM. The calculation task increased BBF in both groups. The chewing task also increased BBF in the inferior frontal gyrus in both groups, although the increase in MP was smaller than in NORM. We discovered that patients with MP exhibited a smaller increase in BBF at the inferior frontal gyrus during chewing as compared with NORM. As such, MP would negatively affect brain function.

Quantitative Evaluation of the Relationship Between Slope Gradient and Infiltration Capacity Based on a Rainfall Experiment Using Pit Sand

2020 ◽  
Vol 15 (6) ◽  
pp. 745-753
Author(s):  
Toru Danjo ◽  
◽  
Tomohiro Ishizawa
Keyword(s):  
Surface Layer ◽  
Slope Stability ◽  
Soil Loss ◽  
Rainfall Intensity ◽  
Horizontal Distance ◽  
Slope Gradient ◽  
Slope Surface ◽  
Infiltration Capacity ◽  
Tank Model ◽  
The Relationship

The infiltration of rainfall into a slope surface may affect slope stability; thus, it is important to understand the amount of rainfall infiltration (hereafter referred to as the “infiltration capacity”) for a slope surface layer when evaluating slope stability. This research focuses on slope gradient, a factor affecting the infiltration capacity, and performs two types of water-spraying experiments using pit sand under the same conditions but with different slope gradients. In the first experiment, the surface flow rate and soil loss were measured using an earth-tank model with a horizontal distance of 0.5 m, depth of 0.1 m, and width of 0.2 m to form slope gradients of 2°, 20°, and 40° to clarify the effect of slope gradient on the infiltration capacity. In the second experiment, a water-spraying experiment that closely simulated natural rainfall was performed at a large-scale rainfall facility owned by the National Research Institute for Earth Science and Disaster Resilience (NIED), Japan. This experiment used an earth-tank model with a horizontal distance of 1.21 m, depth of 0.5 m, and width of 0.5 m to form slope gradients of 2°, 10°, 20°, 30°, and 40° with the aim of proposing a quantitative evaluation method for the relationship between the slope gradient and infiltration capacity. The results showed that the soil loss and infiltration capacity increased as the slope gradient increased in the case of the pit sand used in the experiments. This was confirmed to be due to the fact that an increased gradient allowed grains with diameters of <50 μm in the slope surface layer to flow out easily, thereby increasing the infiltration capacity. In addition, the relationship between the rainfall intensity and infiltration capacity revealed that the infiltration capacity varied depending on the rainfall intensity and slope gradient, which is unlike the relationship for constant values such as the permeability coefficient. Moreover, the research findings indicated a strong, positive linear relationship (R2 = 0.98) between the slope gradient and fitting factor Ic. Therefore, the relationship between rainfall intensity and the infiltration capacity could be expressed using the fitting factor Ic. This suggests the possibility of quantitatively evaluating the relationships between rainfall intensity, the infiltration slope gradient, and the infiltration capacity.

Characteristics of free overfall for supercritical flows

2007 ◽  
Vol 34 (2) ◽  
pp. 162-169 ◽  
Author(s):  
Nuray Denli Tokyay ◽  
Dilek Yildiz
Keyword(s):  
Rectangular Channel ◽  
Free Fall ◽  
Horizontal Distance ◽  
Supercritical Flow ◽  
Downstream Flow ◽  
Supercritical Flows ◽  
The Relationship ◽  
End Depth ◽  
Brink Depth ◽  
Free Overfall

The characteristics of supercritical flow at a vertical drop in a rectangular channel are studied experimentally to obtain information that would be valuable to designers of hydraulic structures. The relationship between the ratio of brink depth to the depth of upstream supercritical flow (i.e., end-depth ratio) and the Froude number is determined. Downstream from the vertical drop, the physical characteristics of the falling jet are examined, such as the height of the standing water behind the jet, the maximum horizontal distance of the jet hitting the floor downstream, the height and length of the splashing water, and the horizontal distance where the downstream flow gains uniformity. The energy loss between the drop and stable downstream flow is also studied.Key words: supercritical flow, brink depth, free fall.

scholarly journals The Relationship of Orthodontic Treatment Need with Periodontal Status, Dental Caries, and Sociodemographic Factors

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Ruhi Nalcaci ◽  
Serhat Demirer ◽  
Firat Ozturk ◽  
Burcu A. Altan ◽  
Oral Sokucu ◽  
...  
Keyword(s):  
Dental Caries ◽  
Significant Relationship ◽  
Orthodontic Treatment ◽  
Treatment Needs ◽  
Treatment Need ◽  
Periodontal Status ◽  
Normal Occlusion ◽  
Periodontal Index ◽  
Relationship Of ◽  
The Relationship

The aim of this study was to determine the relationship of orthodontic malocclusion with periodontal status, dental caries, and sociodemographic status. Our study population consisted of a sample of 836 school children (384 male and 452 female, aged 11–14 years). Four experienced orthodontists and two experienced periodontists performed the clinical examinations. The Treatment Priority Index (TPI), Community Periodontal Index of Treatment Needs (CPITN), decayed, missing, filled teeth (DMFT) scores, and a questionnaire that surveyed socio-demographic status of students were used. Spearman’s rank correlation coefficients were used to measure the association between variables. TPI scores showed that 36.4% of the students had normal occlusion, while 41.2% had slight, 15.7% had definite, 4% had severe, and 2.7% had very severe malocclusion. TPI values did not show any significant differences between pupils in different age, gender, socioeconomic status groups, and CPITN scores, whereas there was a significant relationship between TPI and DMFT scores. The orthodontic treatment need was not significantly correlated with CPITN or socio-demographic status; however, the correlation coefficient showed a significant relationship between TPI and DMFT scores.

scholarly journals Microplastic ingestion and feeding ecology in three intertidal mollusk species from Lima, Peru

2020 ◽  
Vol 55 (2) ◽  
pp. 167
Author(s):  
Gabriel Enrique De-la-Torre ◽  
Diego Marcelo Apaza-Vargas ◽  
Luis Luis Santillán
Keyword(s):  
Feeding Behavior ◽  
Marine Environment ◽  
Feeding Ecology ◽  
Soft Tissues ◽  
Prevention Measures ◽  
Semimytilus Algosus ◽  
The Relationship ◽  
Mollusk Species

Microplastics (< 5 mm) are ubiquitous contaminants in the marine environment. The aims of the present study were to report the incidence of microplastic pollution in three mollusk species from the coast of Lima and to investigate the relationship between microplastic ingestion and feeding ecology. Specimens of three mollusk species Semimytilus algosus, Tegula atra and Chiton granosus were sampled from the intertidal rocky zone. For microplastic isolation, soft tissues were digested in 10% KOH, vacuum filtrated and analyzed under a microscope. Rigorous contamination prevention measures were taken into account. C. granosus was the most contaminated mollusk (6.92 ± 2.13 particles g-1). Red fibers were the overall most abundant microplastic. The feeding behavior of T. atra promotes microplastic exposure to C. granosus. More research is needed to fully understand the microplastic effects on mollusk species.

scholarly journals HUBUNGAN UMUR KEHAMILAN DENGAN STATUS KESEHATAN GINGIVA PADA IBU HAMIL DI WILAYAH KERJA PUSKESMAS ANDALAS KECAMATAN PADANG TIMUR

2015 ◽  
Vol 3 (1) ◽  
pp. 43-49
Author(s):  
Kinanti Fauzin ◽  
Hafni Bachtiar ◽  
Susi Susi
Keyword(s):  
Public Health ◽  
Pregnant Women ◽  
Gestational Age ◽  
Soft Tissues ◽  
Gingival Tissue ◽  
Physiological Changes ◽  
Gingival Index ◽  
Chi Square ◽  
Cross Sectional ◽  
The Relationship

Gingivitis is an inflammation of the soft tissues inoral cavity that invade the free gingival. There are two kinds of etiologies that can cause gingivitis, they are plaque and non-plaque. Pregnant women will have some maternal physiological changes during pregnancy, one of them is the increasing of estrogen and progesterone. It will cause the gingival tissue to react to irritant such as plaque excessively. The aim of this study was to determine the relationship between gestational age and gingival index in pregnant women. This analytic correlation research used cross sectional approach. The gestational age were observed from Mom’s and Kid’s Health Book. The Gingival Index was observed by using Loe and Silness index to each pregnant woman’s oral cavity. Data was analysed by using Chi –square. The study took place in Andalas Public Health Center, from 16th  February 2-15 until 26th  February 2015. Most of the pregnant women had mild gingivitis, no pregnant women were found with healthy gingiva or severe gingivitis. The result showed that there was no significantly relationship between gestational age and gingival index in pregnant women (p>0,005).

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