There are three main types of orthodontic tooth movement: translation (bodily movement), pure rotation, and combined rotation and translation (tipping movement). Different levels of optimal force are required depending on the type of movement. Tipping requires 35-60g of force since only half the periodontal ligament area is compressed. Translation requires 70-120g since the entire area is compressed. Intrusion requires only 10-20g to avoid damage from heavy forces concentrating at the root apex. Root uprighting and torqueing also use force couples that compress within the crown, requiring 50-100g.
biomechanical principles in orthodontics / prosthodontic coursesIndian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Principles of biomechanics in orthodontics / dental implant courses by India...Indian dental academy
Description :
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Mechanics of tooth movement in orthodontic practiceShweta Dhope
# force# centerof resistance # center of rotation # type of tooth movement # type of forces # tipping # torquing# controlled and uncontrolled tooth mob
Cement # continuous, interrupted, intermittent forces
Force, Moments, Couples, Equilibrium, Moment to force ratio, center of rotation, tipping, crown movement, pure translation, toot movement, static equilibrium
a Topic from Chapter 9 of Proffitt's Orthodontics Edition 6, including the Mechanical Principles in Orthodontics.
In this Slide terminology of Biomechanics in Orthodontics is defined along with effects of wide & narrow bracket, with brief description of Moment & Couple used in Orthodontic Tooth Movement.
Biomechanics in orthodontics /certified fixed orthodontic courses by Indian d...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Instruments used in oral and maxillofacial surgeryCing Sian Dal
Instruments used in oral and maxillofacial surgery
Copyright (c) Prof. Dr. U Ko Ko Maung
Department of Oral and Maxillofacial Surgery
University of Dental Medicine, Yangon
Instruments used in oral and maxillofacial surgeryCing Sian Dal
Instruments used in oral and maxillofacial surgery
Copyright (c) Dr. Ko Ko Maung
Department of Oral & Maxillofacial Surgery
University of Dental Medicine, Yangon
Factory Supply Best Quality Pmk Oil CAS 28578–16–7 PMK Powder in Stockrebeccabio
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Hot Selling Organic intermediates
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
NYSORA Guideline
2 Case Reports of Gastric Ultrasound
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
Anti ulcer drugs and their Advance pharmacology ||
Anti-ulcer drugs are medications used to prevent and treat ulcers in the stomach and upper part of the small intestine (duodenal ulcers). These ulcers are often caused by an imbalance between stomach acid and the mucosal lining, which protects the stomach lining.
||Scope: Overview of various classes of anti-ulcer drugs, their mechanisms of action, indications, side effects, and clinical considerations.
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
1. Types of orthodontic tooth
movement
Biomechanics of tooth movement
Types of orthodontic tooth movement
2. Mechanics
Mechanics is the science which deals with the action of
forces on the form and motion of bodies.
Biomechanics
Biomechanics is the study of the action of forces
delivered by the orthodontic appliances on the biologic tissues
such as the teeth, periodontal ligament and the bones
3. An orthodontic appliance is a system, storing
and delivering forces against the teeth, muscles
or bone and creating a reaction within the
periodontal ligament and alveolar bone that
causes movements of the teeth or alters bone
morphology or growth.
5. Force
Force is an energy or strength brought to bear on an
object causing a change in shape or motion.
Force is a vector matter.
It may be represented by its vectors as :
- magnitude
- Direction - line of action.
- sense.
- Point of application.
6.
7. Center of gravity (CG) or center of mass (CM).
Every object or free body has one point where all of
the weight is concentrated at this point.
The object would be perfectly balanced, if
supported, on this point as if the rest of the object does
not exist.
This point is known as the center of gravity (CG) or
center of mass (CM).
8. Center of resistance. (C-ris)
Unlike free body, movement of a tooth is constrained
by the periodontal attachments to the roots, and the alveolar
bone.
Therefore in orthodontic biomechanics, a point
analogous to the center of gravity or center of mass is used.
This point is termed center of resistance. (C-ris)
10. Tooth Movement
Basically, there are three types of movement.
- Translation. (Bodily movement)
- Pure rotation.
- Combined rotation and translation.
12. Pure rotation.
Rotation indicates movement of points of the tooth
along the arc of a circle, with the center of resistance being
the center of the circle.
Center of resistance
13. Combined rotation and translation.
Any movement that is not pure translation or rotation
can be described as combination of rotation and translation.
14. Effects of forces on tooth movements
The movement of a tooth depends upon the
relationship of the line of action of a force to the center of
resistance of a tooth.
Cris
15. If the line of action of a force passing through the center
of resistance the tooth will respond with pure translation or
bodily movement in the direction of the line of action of the
applied force. (Translation or bodily movement)
Cris
Line of action of force
16. If the line of action of the applied force does not pass
through the center of resistance, the center of resistance will
translate as if the force did pass through it, but the tooth will
also rotate, since the applied force produces a moment about
the center of resistance. The resulting movement is combined
translation and rotation. (Tipping movement)
Force
Moment
Translation
17. The magnitude moment is equal to the force multiplied by the
perpendicular distance from the line of action to the center of
resistance.
100 gm
8 mm
Moment = Force x perpendicular distance
= 100 x 8
= 800 gm-mm
100 gm
Force = 100 gm
Tooth movement depends on
the relative degree of force
and moment.
18. A single force (a force with a single point of contact)
cannot produce pure rotation.
A system of forces that can produce rotation of a tooth
is called force couple.
A couple consists of two forces of equal magnitude,
acting in parallel but opposite direction and having different
points of application.
19. A force couple produce moment (Mc) inducing rotation
about center of resistance (Cris) whose magnitude is the
product of the distance between the lines of force composing
the couple (dc) and their magnitude.
F
F
dc
Moment = F x dc
21. Orthodontic Tooth Movement.
Tipping movement
(Combined rotation and translation)
Translation or bodily movement
Rotational movement
Intrusion
Extrusion.
Uprighting
Torqueing
22. Optimal force level
The level of orthodontic force, just enough to
stimulate cellular activity without completely occluding
the blood vessels in the periodontal ligament.
The various force levels are required for different
types of orthodontic tooth movements.
23. The force applied at the crown of a tooth does not
determine the biologic reactions in the PDL.
The force is distributed to the area of the PDL that are
under compression. (force per unit area of PDL compression)
Therefore, the smaller the area of PDL under
compression, the greater the force will be distributed and the
larger the area, the lesser the force.
The area of compression of the PDL depends upon the
types of tooth movement.
Therefore different optimal force levels are required for
various types of tooth movement.
Why does optimal force level varies for different types of
tooth movement?
24. Optimal force for orthodontic tooth movements.
Type of tooth movement Optimal force (gm)
Tipping 35 to 60
Translation (bodily movement) 70 to 120
Root uprighting 50 to 100
Extrusion 35 to 60
Intrusion 10 to 20
25. Tipping movement (combined rotation and translation)
•If the force does not pass through the CR a tooth will translate as
well as rotate around the CR.
•Orthodontically, tipping movement is produced when a single
force (from a spring or labial bow from a removable
orthodontic appliance) is applied against the crown of a tooth.
•A tooth rotates around the center of resistance as well as
translates along the line parallel to the line of force.
•The maximum pressure is created at the alveolar crest on the
opposite side of the force application and at a side near the root
apex on the same side of the force application.
•The pressure is gradually reduced to minimum towards the center
of resistance.
27. Loading diagram consists of two triangles covering in
two areas where its concentration is high in relation to the
force applied to the crown.
According to loading diagram, only one half of the
PDL area that could actually be loaded is under
compression.
Therefore optimal force required to tip the tooth is
quite low, approximately 35 to 60 gm.
The force for translation of tooth at CR would be
much below the optimal force level so that translation
movement is insignificant.
28. Bodily movement.
•Most orthodontic force system apply force at the bracket
cemented to the crown of a tooth. Therefore when a force is
applied at the bracket an equivalent force system at the CR
would be force (causing translation) and a moment of force
(causing rotation).
•For bodily movement the force system applied at the crown
must be equivalent to the force and moment of force at the CR.
•Therefore force system having a force and a couple at the
bracket is needed so that a tooth can be moved bodily.
29. Moment = Force x Perpendicular distance from the point of
application
31. •In bodily movement total PDL area is uniformly loaded from
alveolar crest to apex on the opposite side of force application,
creating rectangular loading diagram.
•Therefore to produce the same pressure in the PDL and the
same biologic response as for tipping, twice the amount of
force would be required for bodily movement.
•The optimal force level for bodily movement would be 70 to
120 gm.
33. •There is no compression of the PDL area instead all the
ligaments are under tension.
•However, since the tooth roots are triangular or oblong
shape some areas of the PDL may be compressed.
•Therefore, optimal force levels for the rotation movement
would be about the same as tipping.
34. Extrusion movement.
•Ideally, the extrusion would produce no area of compression
within the PDL.
•All the PDL would be under tension and stimulate bone
deposition necessary to maintain tooth support.
•Some areas of compression in PDL may occur depending upon
the morphology of root.
•Therefore, optimal force level would be about similar to tipping
movement. 35 to 60 gm. Use of heavy force should be avoided.
35. Intrusion movement
•When a tooth is intruded the whole of the supporting
structure is under pressure with no area of tension. The
force is concentrated over a small area at the apex
resulting in resorption of bone around the root apex.
•Therefore, extremely light force (10 to 20 gm) is needed to
produce appropriate pressure within the PDL during
intrusion.
•Resorption of root is likely to occur if heavy force is used.
37. Root uprighting (Controlled tipping)
•Mesiodistal movement of particularly of root. (more root
movement than crown.)
•Require the application of force couple to the crown in such
a way that the fulcrum lies within the crown.
•Optimal force required would be 50 to 100 gm.
38. Root torqueing
• Labial or palatal movement of apices is referred to as
torqueing.
• Torqueing requires the application of a force-couple to the
crown in such a way that the fulcrum lies within the crown.
39.
40. 4
E r
F
3
L
F = The force delivered for a given deflection
E = Elastic modulus
r= radius
L= Wire length