Border Moulding in Complete Denture Prosthesis ,This Seminar was presented By Dr. Alim Al Razi,DR. Halima Sadia, and Dr. Tahmina Akter at prosthodontics Department ,Dhaka Dental College and Hospital.We tried To cover Full theoretical and practical Information Regarding This Topic.
Border Moulding in Complete Denture Prosthesis ,This Seminar was presented By Dr. Alim Al Razi,DR. Halima Sadia, and Dr. Tahmina Akter at prosthodontics Department ,Dhaka Dental College and Hospital.We tried To cover Full theoretical and practical Information Regarding This Topic.
An introductory and simple guide assembled by dental students and reviewed by Dr. Hasannin Al-Namel. our seminar about impression trays used in prosthodontics
Bevels and flares are very important components of resin restoration procedure. This presentation focuses on bevels and flares in restorative procedure.
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
An introductory and simple guide assembled by dental students and reviewed by Dr. Hasannin Al-Namel. our seminar about impression trays used in prosthodontics
Bevels and flares are very important components of resin restoration procedure. This presentation focuses on bevels and flares in restorative procedure.
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
ART - Atraumatic Restorative Treatment.pptxDrLasya
DEFINITION
ART is defined as a minimally invasive care approach in preventing dental caries and stopping its further progression.
- Jo E. Frencken, 2012
PRINCIPLES
Removing carious tooth tissue using hand instruments only
INDICATIONS
Only in small cavities (involving dentin)
In those cavities that are accessible to hand instruments.
Public health programs
CONTRA INDICATIONS
Presence of swelling (abscess) or fistula (opening from abscess region to the oral cavity) near the carious tooth.
Pulp exposure
Chronic inflammation of the pulp with pain in the tooth
There is an obvious carious cavity, but the opening is inaccessible to hand instruments
There are clear signs of a cavity for example in a proximal surface, but the cavity cannot be entered from the proximal or the occlusal direction.
Reasons for using hand Instruments:
With this technique, restorative care is made available to all population groups.
This technique is said to be tooth friendly as this conserves sound tooth tissues and causes less trauma to the teeth by requiring minimal cavity preparation.
Cost effective technique as this uses hand instruments in place of costly electrically driven dental equipment.
Use of local anesthesia for pain management is minimal there by reducing the psychological trauma to patients.
Hand instruments are easy clean and sterilize after every use, thus making infection control simplified
Reasons for using GIC
GIC sticks chemically both to enamel and dentine- the need to cut sound tooth tissue to prepare the cavity is reduced.
Fluoride is released from the restoration which will prevent and arrest caries.
Biocompatible cement as this restoration does not cause any irritation to pulp and gingiva, and has a co-efficient of thermal expansion similar to tooth structure.
Operators work posture:
Operator eye to patient tooth- 30 to 35 cms
Positions – Direct rear - 12 o’ clock
Right rear – 10 o’clock position
Assistant head - 10 to 15 cms higher than operator
Patient Position
Lying on back on flat surface
Head rest- firm foam or rubber ring
ADVANTAGES
Biological approach
Painless
Simplified infection control
No electrically driven and expensive dental equipment is needed
Technique is simple enough to train non-dental personnel or primary health care workers
Cost effective
Friendly procedure
Procedure:
1. Carious dentin can be removed with Spoon excavator
2. Fracture off unsupported thin enamel with Dental hatchet
3. Again clean the cavity with wet cotton rolls. Dry the tooth surface with dry cotton rolls
4. Apply dentin conditioner in the prepared tooth cavity
5. Mix the required amount of GIC
6. Restore the prepared cavity with mixed GIC with the help of blunt end of applier
7. Press the restorative material with gloved finger
8. Remove excess restorative material with sharp end of applier
9. Check the occlusion using articulating paper
CONCLUSION
ART is a combined preventive and curative oral care approach
Atraumatic restorative treatment (art) for tooth
Atraumatic Restorative Treatment (ART), is based on removing decalcified tooth tissue using only hand instruments and restoring the cavity with an adhesive filling material.
A minimally invasive approach to both prevent dental carious lesions and stop its further progression
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
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Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. In orthodontics, impression gives a negative imprint of the
tissues and by filling it with dental stone or other model material a
positive cast is made that can be removed after model material has
set; which in turn are used for-
1. STUDY PURPOSE
2. FABRICATION OF APPLIANCES
3. MAINTAINING RECORDS
3. IDEAL REQUISITES OF AN IMPRESSION
MATERIAL
• Be non toxic to the tissues.
• Should have an adequate shelf life .
• Be sufficiently fluid on insertion to give accurate surface
detail.
• Have pleasant taste, smell and appearance .
• Have no dimensionsal changes either in or out of the
mouth at all normal degrees of temperature and
humidity.
•Set or harden, at or near mouth temperature .
•It should have suitable working and setting time.
•Be compatible with die and model materials
•Be inexpensive
4. Classification of the
Impression materials based on:
Setting Thermoplastic Thermoset
Reaction
Elasticity Elastic Non-elastic
Reversible Irreversible
Nature of the
setting reaction
Pressure
Exerted on the
tissue
Mucocompressive Mucostatic
Dentition
status
Edentulous Dentulous
5. In orthodontics we require impression materials that are elastic
since we deal with dentulous patients
The most commonly employed materials include
I. Hydrocolloid – Agar Agar (reversible)
- Alginate (irreversible)
II. Elastomeric impression materials.
7. Properties
# Alginates are sufficiently flexible to record fine detail in the mouth..
# The reaction is faster at higher temperature and so the material is contact
with the tissues sets first.
# Any pressure on the gel due to movement of the tray will set up stresses
within the materials which will distort the alginate after its removal from the
mouth.
# The material is sufficiently elastic to be withdrawn over undercuts;
occasionally tearing of the impression materials may occur with serious
undercuts.
# Alginate are not stable on storage because of evaporation
# Short shelf life.Alginate impression material deteriorates rapidly at elevated
temperature and The material should be stored in cool dry place.(not above 37c)
# Alginate impression loses water by evaporation and shrinks on standing in air
# If it is placed in water it absorbs water and swells .Therefore, cast should be
poured immediately after making the impression.
# If storage is unavoidable keeping in a humid temperature of 100% results in
least dimensional changes.
8. • Inexpensive and hydrophillic (contact angle 37°)
• Easy to manipulate
• Displace blood and saliva and pour well with gypsum stone
• Minimum requirement of equipments
• Accurate if proprely handled
WORKING TIME -
#for fast setting materials -1.25 to 2 min (mixing time-45 sec)
#for regular setting times is - 2 to 4.5 min (m.t.-60 sec)
9. Disadvantages of alginate
Low tearstrength
Poorer reproduction of surface detail as
compare to agar
Not as dimensionally acccurate as medium and light body
silicone.
Not dimensionally stable on storage due to syneresis and poured
immediately.(triethanolamine modified alginates more stable in long
life hermetically sealed bags impressions can be stored for 48 hrs)
10. Impression Trays
They are used to carry the impression material
to the mouth in its plastic state till it sets.
13. MAXILLARY TRAY
• The tray must completely cover the tuberosity
• Must be 4mm wider than the most apical portion of the alveolar process at the
molar region.
• The tray must cover the anteriors with the incisors contacting the flat portion of
the tray about 4 mm from the raised palatal part of the tray.
Selection Of Impression Tray
• The tray should cover all the teeth as well as the retromolar pad
• The tray should be 4-6 mm wider than the buccal and lingual portion of the
anterior teeth
• It must be possible to center the tray
MANDIBULAR TRAY
14. Prepration Of The Patient
• Explain the procedure to the patient in the simplest of
terms so that the patient is aware of the procedure and
therefore the fear of the unknown is over come.
•Seat the patient upright so as to prevent the gagging due
to the backward flow of the excess material into the
throat.
•Advice the patient to breath through the nose and in case
of gagging try and distract the patient’s attention and ask
the patient to look down wards.
•Practice the placement of the empty tray into the patient’s
mouth
15. MANIPULATION
The recommended water powder ratio should be used. In general it is 38 ml of water per 16
gms of powder but slight variation can be presented depending on the manufacturer. The
weighed power is incorporated into the water by carefully mixing with the spatula. Care should
be taken to ensure that air is not incorporated into the mix by spatulating the mix against the
side of the bowl while using the vigorous figure of 8 motion till a smooth creamy mix is
obtained.
16. SEQUENCES OF
IMPRESSION MAKING
It is advisable to make mandibular impression first as there is less chance of the patient
to gag .This allows the patient to become accustomed to the taste and the feeling of the
material in the mouth which in turn reduces the chances of gagging while making an
impression of the maxillary arch.
17. SEATING THE IMPRESSION TRAY
Mandibular Impression
• Operator position at 7 O’clock
• Patient seated such a way that the occlusal plane placed parallel to the floor.
• Use the thumb and the index finger of the free hand to retract the cheek.
• Grasp the handle of the tray and rotate the tray into the mouth by using the
front of the tray to deflect the other cheek.
• Once inserted straighten the tray so that the tray is in line with the patient’s
midface
• Note the position of the tray in relation to the anteriors.
• Using the index finger of both the hands press the tray downwards
• Manipulate the patients cheeks and lips to create a more detailed anatomy of
the facial and vestibular area.
• Ask the patient to raise the tongue and then move it from side to side.
• Allow the material to set and then remove. Using a firm grip on the tray handle,
use a side ways lifting motion to remove the tray.
18. Maxillary Impression
• Operator position at 11 O'clock position
• Patient seated such a way that the occlusal plane placed parallel to the
floor.
• A blob of material may be placed in the palatal vault of the patient just
behind the incisors, to eliminate the trapped air and to ensure the
faithful reproduction of palatal tissue.
• Use the thumb and the index finger of the free hand to retract the
cheek.
• Once inserted straighten the tray so that the tray is in line with the
patient’s mid face .
• Begin to apply light pressure upwards till the light resistance is felt.
20. Disinfecting The Impression
Disinfection of impression is a concern due to viral diseases such as Hepatitis
B,A I D S and herpes simplex
• Gently rinse the impression under the tap water to remove any debris
that may be retained in the impression.
• Gently shake the excess water.
• Spray the entire impression with an O.S.H.A. (occupational health and safety
administration) approved disinfecting solution.
OR
May immerse the impression in a disinfectant such as :
gluteraldehyde solution
Iodophors
1:10 dilution of sodium hypochlorite synthetic phenols
21. Criteria For Accessing The Impression
• Lack of voids.
• No distortion , clear and distinct impression
• Adequately extended.
• Free of debris and extraneous material.
• Adequate details and all structure must be recorded.
• Stable material which is sufficiently attached to the tray.
22. CAUSES OF
FAILURE1. Grainy
material
2.
Tearing
3. External
bubbles
•Improper mixing
•Prolong mixing
•Undue gelation
•Water : powder ratio too low
•Inadequate bulk
•Moisture contamination
•Premature removal from
mouth
•Prolong mixing
•Undue gelation, preventing
flow
•Air incorporated during
mixing
23. 4. Irregularly shaped
voids
•Moisture or debris on
tissue
5. Rough and chalky
stone model
•Inadequate cleansing
of impression
•Excess water or
potassium sulfate
solution left in
impression
•Premature removal of
model
6.
Distortion
•Impression not
poured immediately
•Movement of tray
during gelation
•Premature removal from
mouth
24. CONCLUSION
•One must not depend on a material to provide good impressions.
•Any material is good and shouldbe used till the operator is familiar
with its characteristics
•Selecting the impression material depends on the convenience of the
dentist and clinical situation.
ALL WE NEED IS AN ACCURATE IMPRESSION.
Thank You