This document describes the anatomy of mandibular premolars. It notes that the mandibular first premolar generally has a longer crown and shorter root than the second premolar. The two main types of mandibular second premolars are two-cusped and three-cusped. The document outlines distinguishing characteristics of the premolars when viewed from the buccal, lingual, proximal, and occlusal aspects.
Maxillary Second Premolar
the maxillary first premolar in function
Less angular ,rounded crown in all aspects.
Single root
Smaller crown cervico occlusally
Root length is as great or greater
BUCCAL ASPECT
Not as long as that of the first premolar
Less pointed
Mesial slope is
shorter than the distal slope
Buccal ridge of the crown may not be so prominent whencompared with the first premolarLINGUAL ASPECT
Lingual cusp is longer making the crown longer on the lingual sideMESIAL ASPECT
Cusps of second premolar are shorter with the buccal and lingual cusps more nearly the same length
Greater distance between cusp tips-that widens the occlusal surface buccolingually
No developmental depression on the mesial surface of the crown as on the first premolar
Crown surface is convex instead
No deep dev. Groove crossing the mesial marginal ridgeOCCLUSAL ASPECT
Outline of the crown is more rounded or oval rather than angular
Central dev. groove is shorter and more irregular
Tendency toward multiple supplementary grooves radiating from the central groove that may extend out to the cusp ridges
Makes for an irregular occlusal surface and gives a very wrinkled appearance
Mandibular central incisors are two in number
Mandibular central incisor and lateral are similar in anatomy and complement each other in function
They are smaller than the maxillary central incisors
Mandibular central incisor erupts between the age of 7 and 8 years
First tooth from the midline in each lower quadrant
Maxillary Second Premolar
the maxillary first premolar in function
Less angular ,rounded crown in all aspects.
Single root
Smaller crown cervico occlusally
Root length is as great or greater
BUCCAL ASPECT
Not as long as that of the first premolar
Less pointed
Mesial slope is
shorter than the distal slope
Buccal ridge of the crown may not be so prominent whencompared with the first premolarLINGUAL ASPECT
Lingual cusp is longer making the crown longer on the lingual sideMESIAL ASPECT
Cusps of second premolar are shorter with the buccal and lingual cusps more nearly the same length
Greater distance between cusp tips-that widens the occlusal surface buccolingually
No developmental depression on the mesial surface of the crown as on the first premolar
Crown surface is convex instead
No deep dev. Groove crossing the mesial marginal ridgeOCCLUSAL ASPECT
Outline of the crown is more rounded or oval rather than angular
Central dev. groove is shorter and more irregular
Tendency toward multiple supplementary grooves radiating from the central groove that may extend out to the cusp ridges
Makes for an irregular occlusal surface and gives a very wrinkled appearance
Mandibular central incisors are two in number
Mandibular central incisor and lateral are similar in anatomy and complement each other in function
They are smaller than the maxillary central incisors
Mandibular central incisor erupts between the age of 7 and 8 years
First tooth from the midline in each lower quadrant
mandibular premolars, common triats and differences between mandibular first and second premolar. buccal aspect, lingual aspect, mesial aspect, distal aspect, occlusal aspect of mandibular premolars
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
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
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
Acute scrotum is a general term referring to an emergency condition affecting the contents or the wall of the scrotum.
There are a number of conditions that present acutely, predominantly with pain and/or swelling
A careful and detailed history and examination, and in some cases, investigations allow differentiation between these diagnoses. A prompt diagnosis is essential as the patient may require urgent surgical intervention
Testicular torsion refers to twisting of the spermatic cord, causing ischaemia of the testicle.
Testicular torsion results from inadequate fixation of the testis to the tunica vaginalis producing ischemia from reduced arterial inflow and venous outflow obstruction.
The prevalence of testicular torsion in adult patients hospitalized with acute scrotal pain is approximately 25 to 50 percent
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
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
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
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.
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
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
3. Type Traits Of MandibularType Traits Of Mandibular
PremolarsPremolars
1. A 2-cusp type with 1 lingual cusp
2. A 3-cusp type with 2 lingual cusps
4. Distinguishing Characteristics OfDistinguishing Characteristics Of
Mandibular PremolarsMandibular Premolars
Generally speaking :
1. The mand. 1st premolar has
a longer crown and a shorter
root than the 2nd premolar
2. The mand. 1st premolar is
longer overall than the 2nd
2nd 1st
5. Buccal Aspect OfBuccal Aspect Of
Mandibular PremolarsMandibular Premolars
1. Crown Shape: (roughly
pentagonal)
1st: Nearly symmetrical except for
a shorter mesial cusp ridge and a
distal bulge of the crown
6. Buccal Aspect OfBuccal Aspect Of
Mandibular PremolarsMandibular Premolars
1. Crown Shape: (roughly
pentagonal)
2nd premolar: Buccal cusp is
less pointed and cusp slopes
are less steep than on the
mandibular 1st premolar
2nd 1st
7. 2nd 1st
Buccal AspectBuccal Aspect
2. Notches on Cusp Ridges:
Notches often seen on
mesiobuccal cusp ridge in
mandibular 1st premolars
Notches often seen on
distobuccal cusp ridge in
mandibluar 2nd premolars
8. Buccal AspectBuccal Aspect
3. Cervical Lines:
The cervical line of the
mandibular 1st premolar
is more rounded
mesiodistally, while that of
the 2nd premolar is more
flat
2nd 1st
9. Buccal AspectBuccal Aspect
4. Contact Areas - Mesial:
1st and 2nd premolar - near
junction of occlusal and
middle third
10. Buccal AspectBuccal Aspect
5. Contact Areas - Distal:
1st premolar distal contact
area is more OCCLUSAL
than the mesial contact area
(an exception to the rule)
11. Buccal AspectBuccal Aspect
6. Contact Areas - Distal:
2nd premolar has a
distal contact located
more cervical than the
mesial contact area, as is
usually the case with
posterior teeth
12. Lingual Aspect Of MandibularLingual Aspect Of Mandibular
PremolarsPremolars
1. Crown Shape:
Mandibular first
premolar crown tapers
(converges) to the lingual
(narrower on lingual side
that buccal)
13. Lingual Aspect Of MandibularLingual Aspect Of Mandibular
PremolarsPremolars
1. Crown Shape:
Mandibular 2nd premolar with 1
lingual cusp, crown tapers to
lingual
Mandibular 2nd premolar with 2
lingual cusps, crown is as wide or
wider mesiodistally than the
buccal
14. Lingual AspectLingual Aspect
2. Cusp Size and Shape:
Mandibular 1st premolar
lingual cusp is small and
pointed
Most of the occlusal surface
can be seen from this aspect
M D
15. Lingual AspectLingual Aspect
2. Cusp Size and Shape:
Mandibular 2nd premolar
with 1 lingual cusp:
Lingual cusp is smaller than
buccal cusp, but larger than
lingual cusp of 1st premolar
M D
16. 2. Cusp Size and Shape:
Mandibular 2nd premolar with
2 lingual cusps:
ML cusp is larger than the DL
cusp, with the L groove
between them and onto the
lingual crown surface
ML DL
M D
Lingual AspectLingual Aspect
17. Lingual AspectLingual Aspect
3. Marginal Ridges:
Mandibular 1st premolar:
Only tooth in the mouth
where the mesial marginal
ridge is more apical than the
distal marginal ridge
M D
18. Lingual AspectLingual Aspect
3. Marginal Ridges:
Mandibular 2nd premolar:
Mesial marginal ridge is
more occlusal than the distal
marginal ridge (as found in
all other teeth)
M D
20. Proximal Aspect Of MandibularProximal Aspect Of Mandibular
PremolarsPremolars
1. Crown Shape - Rhomboid:
The crowns of both
premolars tilt lingually,
but the mandibular 1st
premolar tilts more
lingually than the
mandibular 2nd premolar
Mesial View
21. Proximal Aspect Of MandibularProximal Aspect Of Mandibular
PremolarsPremolars
1. Crown Shape -
Rhomboid:
In both premolars, the
lingual cusps are
shorter than the buccal
cusps
Mesial View
22. Proximal AspectProximal Aspect
2. Mesiolingual Groove:
Often present on Mandibular 1st
premolar between the mesial
marginal ridge and the mesial slope
of the lingual cusp
Not present on Mandibular 2nd
premolars
26. Proximal AspectProximal Aspect
5. Root (proximal):
Both premolars generally
consist of one root
The mandibular 1st
premolar occasionally will
have a furcated root
27. Proximal AspectProximal Aspect
6. Root Depressions:
Mandibular 1st premolar:
Have a shallow root
depression in the apical and
middle thirds of both mesial
and distal root surfaces
Mesial
Distal
28. Proximal AspectProximal Aspect
6. Root Depressions:
Mandibular 2nd premolar:
Have a distal root depression in
the middle third of the root, but
NO mesial depression
Mesial
Distal
29. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
1. Outline:
– Have much variation in
occlusal morphology
– Outline is not symmetrical
(more bulky on the distal)
DM
30. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
1. Outline:
– Often appears as if the mesial
side has been pushed inward
(mesiolingual corner)
DM
31. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
1. Outline:
– Tip of the buccal cusp
is near the center from
occlusal view
– Lacks a prominent
buccal ridge
– Cusp ridges are nearly
straight lines
DM
32. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
1. Outline:
– Crown is somewhat
diamond shaped
converging lingually
– Shape of crown is
asymmetrical DM
33. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
1. Outline:
– Mesial and distal
marginal ridges may
converge lingually
34. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
2. Ridges, Fossae, Grooves:
– Due to size of cusp, the
buccal triangular ridge
is long
– Joins the shorter lingual triangular ridge
– Often may meet smoothly and form a uninterrupted
transverse ridge
35. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
2. Ridges, Fossae, Grooves:
– The transverse ridge
may be crossed by
a shallow central groove
extending from mesial to distal fossa
– This is rare
36. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
2. Ridges, Fossae, Grooves:
– The grooves of the first premolar are fewer in
number, but may be deeper than those of the
second premolar (just like the maxillary)
37. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
First PremolarFirst Premolar
2. Ridges, Fossae, Grooves:
– Possess a mesial
and distal fossa
– Both are circular,
not triangular
– Both possess pits
– Distal fossa is usually larger and/or deeper
D
38. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
1. Outline - Two-cusp version:
– Crown is round or oval
shaped with a square
occlusal table
39. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
1. Outline - Two-cusp version:
– There is slightly more bulk in
the mesial half buccolingually
than in the distal half
40. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
2. Ridges, Fossae, Grooves - Two-cusp version:
– Lingual cusp smaller than
buccal cusp
– Possess more supplemental
grooves than first premolars
– Also has a smaller triangular
ridge
41. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
2. Ridges, Fossae, Grooves - Two-cusp version:
Possess a curved central
groove with no lingual
groove
This groove can be fairly
straight
D
42. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
1. Outline - Three-cusp version:
– When lingual cusps are
large, the occlusal
surface is broader on the
lingual
43. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
1. Outline - Three-cusp version:
Often have greater bulk buccolingually in the
distal not the mesial
The ML cusp is usually
larger than the DL cusp
ML DL
44. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
2. Ridges, Fossae, Grooves - Three-cusp version:
Possess three triangular
ridges converging toward
the central fossa
There is no transverse ridge
1
2 3
45. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
2. Ridges, Fossae, Grooves - Three-cusp version:
Has a central fossa
(unique) shifted
towards the distal
Lacks a central groove
Mesial groove present
M
C
D
46. Occlusal Aspect Of MandibularOcclusal Aspect Of Mandibular
Second PremolarSecond Premolar
2. Ridges, Fossae, Grooves - Three-cusp version:
Possess a lingual groove
that separates the two
lingual cusps
This groove completes
the Y-shaped occlusal
groove pattern