in this lecture we will discuss everything about fixed partial denture types, components, designs, parts, materials and classifications.
hope you enjoy it .
Non rigid connectors in fixed prosthesis / cosmetic dentistry trainingIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Non rigid connectors in fixed prosthesis / cosmetic dentistry trainingIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
In prosthodontics, replacing the missing, without affecting the other components of the masticatory system has two main reference the maximum intercupation and the centric relation.
In this lecture discussion of centric relation as reference is exposed.
this presentation has all the techniques in impression making in the fabrication of an RPD.
The presentation is available on request. Mail me at apurvathampi@gmail.com
In prosthodontics, replacing the missing, without affecting the other components of the masticatory system has two main reference the maximum intercupation and the centric relation.
In this lecture discussion of centric relation as reference is exposed.
this presentation has all the techniques in impression making in the fabrication of an RPD.
The presentation is available on request. Mail me at apurvathampi@gmail.com
Rehabilitation of endodontically treated teeth : Post & CoreNaveed AnJum
These days we often come across mutilated or badly broken teeth in our practice. However various factors are involved for a better prognosis of such a teeth. This presentation mainly focuses on post and core treatment of such a teeth.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
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.
HOT NEW PRODUCT! BIG SALES FAST SHIPPING NOW FROM CHINA!! EU KU DB BK substit...GL Anaacs
Contact us if you are interested:
Email / Skype : kefaya1771@gmail.com
Threema: PXHY5PDH
New BATCH Ku !!! MUCH IN DEMAND FAST SALE EVERY BATCH HAPPY GOOD EFFECT BIG BATCH !
Contact me on Threema or skype to start big business!!
Hot-sale products:
NEW HOT EUTYLONE WHITE CRYSTAL!!
5cl-adba precursor (semi finished )
5cl-adba raw materials
ADBB precursor (semi finished )
ADBB raw materials
APVP powder
5fadb/4f-adb
Jwh018 / Jwh210
Eutylone crystal
Protonitazene (hydrochloride) CAS: 119276-01-6
Flubrotizolam CAS: 57801-95-3
Metonitazene CAS: 14680-51-4
Payment terms: Western Union,MoneyGram,Bitcoin or USDT.
Deliver Time: Usually 7-15days
Shipping method: FedEx, TNT, DHL,UPS etc.Our deliveries are 100% safe, fast, reliable and discreet.
Samples will be sent for your evaluation!If you are interested in, please contact me, let's talk details.
We specializes in exporting high quality Research chemical, medical intermediate, Pharmaceutical chemicals and so on. Products are exported to USA, Canada, France, Korea, Japan,Russia, Southeast Asia and other countries.
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.
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
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
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
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
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
263778731218 Abortion Clinic /Pills In Harare ,sisternakatoto
263778731218 Abortion Clinic /Pills In Harare ,ABORTION WOMEN’S CLINIC +27730423979 IN women clinic we believe that every woman should be able to make choices in her pregnancy. Our job is to provide compassionate care, safety,affordable and confidential services. That’s why we have won the trust from all generations of women all over the world. we use non surgical method(Abortion pills) to terminate…Dr.LISA +27730423979women Clinic is committed to providing the highest quality of obstetrical and gynecological care to women of all ages. Our dedicated staff aim to treat each patient and her health concerns with compassion and respect.Our dedicated group ABORTION WOMEN’S CLINIC +27730423979 IN women clinic we believe that every woman should be able to make choices in her pregnancy. Our job is to provide compassionate care, safety,affordable and confidential services. That’s why we have won the trust from all generations of women all over the world. we use non surgical method(Abortion pills) to terminate…Dr.LISA +27730423979women Clinic is committed to providing the highest quality of obstetrical and gynecological care to women of all ages. Our dedicated staff aim to treat each patient and her health concerns with compassion and respect.Our dedicated group of receptionists, nurses, and physicians have worked together as a teamof receptionists, nurses, and physicians have worked together as a team wwww.lisywomensclinic.co.za/
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
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.
2. INTRODUCTION
• PONTIC is the artificial tooth in the fixed
or removable partial dentures; that is, the
suspended portion of the fixed partial
denture (bridge) replacing the missing
natural tooth or teeth.
• The pontic may be fabricated from cast
metal or combination of metal and
porcelain.
3. DEFINITIONS
Fixed bridge: fixed dental prosthesis used to replace one or
more missing teeth by joining an artificial tooth definitively
to adjacent teeth or dental implants.
Abutment: The tooth that supports and retains a dental
prosthesis.
Pontic: The artificial tooth that replaces a missing natural
tooth.
Retainer: The component attached to the abutment for
retention of the prosthesis. Retainers can be major or
minor.
Unit: Pontics and abutment teeth are referred to as units.
The total number of units in a bridge is equal to the
number of pontics plus the number of abutment teeth.
4. CONT..
• Saddle: The area on the alveolar ridge which is
edentulous where at least one missing tooth is to be
reinstated.
• Connector: Joins the pontic to the retainer or two
retainers together. Connectors may be fixed or
movable.
• Span: The length of the alveolar ridge between the
natural teeth where the bridge will be placed.
• Resin bonded bridge: A dental prostheses where
the pontic is connected to the surface of natural teeth
which are either unprepared or minimally prepared
6. PONTIC DESIGN
• Pontic design selection depends on the location of the edentulous area. Controversies exist
for the gingival embrasure space and design. Some considered less plaque accumulation with
space closure while other proposed open embrasure space for oral
hygiene maintenance pontic.
• Pontic resembles the tooth morphology and may be altered to meet extra demands in
certain clinical scenarios such as in case of convex tissue surfaces and narrow occlusal table.
• Decreasing the buccolingual width lead to decrease in interferences in eccentric movements.
• Some authors considered normal size occlusal table, whereas other considered it to be of
minimum importance.
7. • Pontic should be out of tissue contact when proceeding from facial to lingual.
• Different shapes of pontic are selected according to the position of the
edentulous space, amount of bone resorption, and operator's and
patient's preferences.
• It is recommended that the prosthodontist or the dental practitioner should
advise the dental laboratory about the shape of the desired pontic for the
fixed prosthesis.
• There is a variety of pontic designs (such as ridge lap, ovate, and conical) for
mandibular and maxillary arches.
8. THE REQUIREMENTS OF THE PONTIC DESIGN INCLUDE
• Looks like the tooth it replaces.
• Tissue contact appear as normal tooth.
ESTHETICS
• Can maintain healthy tissues.
• Cleansable.
BIOCOMPATIBILITY
• Strong enough to withstand functional forces.
• Rigid and resistant to deformation.
• Provides normal function.
MECHANICAL
9. FUNCTIONS OF THE PONTIC
1) MASTICATION
The pontic provides hard surfaces against which food can be chewed by teeth in the opposing arch .
2) SPEECH (PHONETICS)
A space created by the loss of tooth alters the pattern of airflow making normal speech difficult. pontic helps to restrict air
passage through edentulous area to aid in the reestablishment of normal sounds.
3) ESTHETICS (APPEARANCE)
Pontics , fill in the empty spaces that would be observed during talking and smiling, provide support for lips and cheeks to
allow normal facial form.( well-aligned teeth and a pleasing smile afford apositive social status!) .
4) MAINTENANCE OF TOOTH RELATIONSHIP
Pontics maintain the integrity of dental arches by preventing teeth that are adjacent to and opposing an edentulous area
from moving out of their relationship. when missing teeth are not replaced, the teeth posterior to edentulous areas can
move forward from their normal position , its also possible for teeth anterior and to opposing edentulous spaces to drift
distally and occlusally into open area.
11. TYPES OF BRIDGES
• Conventional bridge
High Translucent zirconium fixed - fixed bridge built with VM9 vita porcelain and
stained with luster paste. The upper first premolar is considered the pontic and
the teeth prepared are abutments.
Conventional bridges are bridges that are supported by full coverage crowns,
three-quarter crowns, post-retained crowns, onlays and inlays on the abutment
teeth. In these types of bridges, the abutment teeth require preparation and
reduction to support the prosthesis. Conventional bridges are named depending
on the way the pontic (false teeth) is attached to the retainer.
12. CONT…
• Fixed-fixed bridges
A fixed-fixed bridge refers to a pontic which is attached to a retainer
at both sides of the space with only one path of insertion. This type
of design has a rigid connector at each end which connects the
abutment to the pontic. As the abutments are connected together
rigidly it is critical that during tooth preparation the proximal
surfaces of the abutment teeth must be prepared so that they are
parallel to each other.
• Cantilever
A cantilever is a bridge where a pontic is attached to a retainer only
at one side. The abutment tooth may be mesial or distal to the
pontic.
• Spring cantilever
The pontic and retainer are remote from each other and connected
by a metal bar. Usually, a missing anterior tooth is replaced and
supported by a posterior tooth. This design of bridge has been
superseded.
13. CONT…
• Fixed-movable
The pontic is firmly attached to a retainer at one end of the span (major retainer)
and attached via a movable joint at the other end (minor retainer).
A major advantage of this type of bridge is that the movable joint can
accommodate the angulation differences in the abutment teeth in long axis,
which enables the path of insertion to be irrespective of the alignment of the
abutment tooth.
This enables a more conservative approach as the abutments do not need to be
prepared so that are parallel to one and other. Ideally the rigid connector should
attach the pontic to the more distal abutment. The movable connector attaches
the pontic to the mesial abutment, enabling this abutment tooth limited
movement in a vertical direction.
• Adhesive bridge "Maryland bridge"
An alternative to the traditional bridge is the adhesive bridge (also called a
Maryland bridge). An adhesive bridge utilises "wings" on the sides of the pontic
which attach it to the abutment teeth. Abutment teeth require minor or no
preparation. They are most often used when the abutment teeth are whole and
sound (i.e., no crowns or major fillings).
14. CONT...
• Combination Designs
The incorporation of elements of different conventional bridge designs. A popular
combination design is the use of a fixed-fixed design with a cantilever.
• Hybrid Designs
Bridges that incorporate elements of both conventional and adhesive bridge
designs.
16. (A) Pontics with mucosal contact:
1. Saddle Pontic (full ridge lap)
• Overlaps the ridge (largest area of contact).
• Most natural feeling.
• Most difficult to clean (concave tissue surface
overlying residual ridge Bucco-lingual).
• Should be avoided.
• Used for Limited occlusal-gingival space.
17. 2. Ridge Lap Pontic
• Like saddle on buccal.
• Convex on the lingual.
• More cleansable than saddle design.
• Potential for tissue irritation minimized.
• Combines best features of
saddle(aesthetic) & hygienic pontics.
• Used when the tooth lie in the
appearance zone (max & man).
18. 3. Modified Ridge Lap Pontic
• Contacts tissue only on most facial surface of
the pontic.
• Most cleansable.
• Least tissue irritation.
• Space between pontic and tissue on lingual
can be unacceptable to the patient.
• Used when the tooth lie in the appearance
zone (max & man.).
19. 4. Ovate Pontic
• Placed in convexity on edentulous
ridge.
• Appears to be growing out of
tissue.
• Natural feeling for patient.
• Difficulty in cleaning.
• Potential for tissue irritation.
• Used for Maxillary incisor and
premolars.
• Requires surgical preparation.
(a) ridge lap/saddle; (b) modified ridge lap and (c) ovate pontic.
20. 5. Modified Ovate Pontic
• The modification of the ovate pontic involves moving the
height of contour at the tissue surface from the center of
the base to be more labialy.
• Position 1-1.5 mm apical and palatal to gingival margin.
• The modified ovate pontic does not require as much
facio-lingual thickness to create an emergence profile.
• Excellent aesthetics.
• Fulfilled functional requirements.
• easier cleaning compared with the ovate pontic.
• need for surgical augmentation of the ridge.
21. 6. Conical Pontic (bullet, spheroid)
• egg shaped or spheroid shape.
• used as pontic in non aesthetic areas.
• convex shape with only one point touches the residual ridge.
• The most easiest design to clean compared with mucosal
contact design.
• Used when occlusal 2/3 of the facial surface lie in the
appearance zone but not gingival 1/3 (lower incisors,
premolars and molars).
22. 1. Hygienic (sanitary):
• Made entirely from metal.
• Doesn’t have any contact with underlying
tissue.
• Primary design for the non appearance zone
in mandibular posterior region.
• Most cleansable.
• Convex shaped.
• No tissue contact.
• 3 mm space between the pontic and gingiva.
• 3 mm thickness of pontic.
(B) Pontic with non-mucosal contact
23. 2. Modified Hygienic Pontic.
• A modified version of the sanitary pontic.
• It gingival portion is shaped like archway between the
retainers.
• This geometry added bulk for strength in the connectors
while decreasing the stress concentrated in the pontic and
connectors.
• Made entirely from metal.
• Doesn't have any contact with underlying tissue.
• Primary design for the non appearance zone in
mandibular posterior region.
• Access for cleaning is good.
24. procedure
1. Wax patterns were prepared,
sprued, and invested. The
alloy was melted, cast into
the mold, and then bench-
cooled.
2. After divesting, the alloy was
blasted with 50-µm Al, 03
particles.
3. clean with steam.
25. 4. After surface treatment, the specimens were oxidized
by heating them in a mild vacuum (10 mmHg) in a
dental ceramic furnace from 450 ° C to 1000 ° C at a rate
of 45 ° C / min with a 1-minute hold at the peak
temperature. The specimens were bench cooled to
room temperature (RT).
Three of these sheet specimens were left in this
oxidized state. Their surfaces were first examined with
XPS.
26. 5. Fabrication of the crowns used PFM firing
cycles.
- Two layers of opaque dental porcelain, with a
combined thickness of 0.4 mm, were fired onto the
crown surfaces.
- Two layers of dentin and enamel porcelain, with a
combined thickness of approximately 1.0 mm, were
fired onto the crowns. The crowns were bench set
at RT after each firing cycle. The total porcelain
thickness was approximately 1.4 mm.
- A layer of glaze were fired onto the crowns, and the
completed crowns were allowed to cool to RT.
- The surfaces were then carefully cleaned and air
dried.