Auxillary methods of retention in class ii dental amalgam restorationsIndian 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.
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
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.
Class i preparation for amalgam,PRESENTED BY: DR. ANUBHUTI BDS,MDS Dept. of ...Anubhuti Singh
Fundamentals of cavity preparation for class I Amalgam restoration
Conservative tooth preparation is recommended to protect the pulp, to preserve the strength of the tooth, and reduce deterioration of the amalgam restoration
Intra & extra coronal restoration resistance form /certified fixed orthodont...Indian dental academy
Welcome to 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 has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients
State of the art comprehensive training-Faculty of world wide repute &Very affordable.
Introduction
Teeth do not possess the regenerative ability found in most other tissues. Therefore, once the enamel or dentine is lost as a result of caries, trauma, or wear, restorative materials must be used to re-establish the form and function. Teeth require preparation to receive restorations and these preparations must be based on fundamental principles from which basic criteria can be developed to help predict the success of the prosthodontic treatment.
Definition
Objectives of tooth preparation
Principles of tooth preparation
Biological considerations
Mechanical considerations
Esthetic considerations
Conclusion
Each tooth preparation must be measured by clearly defined criteria that can be used to identify and correct problems. It is important to understand the pertinent theories underlying each step is crucial. Successful preparation can be obtained most easily by systematically following the steps which will ensure optimal quality of final restoration, which will serve the patient for a long time.
Copy of fundamentals of cavity preparations / dental implant 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.
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.
Auxillary methods of retention in class ii dental amalgam restorationsIndian 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.
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
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.
Class i preparation for amalgam,PRESENTED BY: DR. ANUBHUTI BDS,MDS Dept. of ...Anubhuti Singh
Fundamentals of cavity preparation for class I Amalgam restoration
Conservative tooth preparation is recommended to protect the pulp, to preserve the strength of the tooth, and reduce deterioration of the amalgam restoration
Intra & extra coronal restoration resistance form /certified fixed orthodont...Indian dental academy
Welcome to 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 has a unique training program & curriculum that provides students with exceptional clinical skills and enabling them to return to their office with high level confidence and start treating patients
State of the art comprehensive training-Faculty of world wide repute &Very affordable.
Introduction
Teeth do not possess the regenerative ability found in most other tissues. Therefore, once the enamel or dentine is lost as a result of caries, trauma, or wear, restorative materials must be used to re-establish the form and function. Teeth require preparation to receive restorations and these preparations must be based on fundamental principles from which basic criteria can be developed to help predict the success of the prosthodontic treatment.
Definition
Objectives of tooth preparation
Principles of tooth preparation
Biological considerations
Mechanical considerations
Esthetic considerations
Conclusion
Each tooth preparation must be measured by clearly defined criteria that can be used to identify and correct problems. It is important to understand the pertinent theories underlying each step is crucial. Successful preparation can be obtained most easily by systematically following the steps which will ensure optimal quality of final restoration, which will serve the patient for a long time.
Copy of fundamentals of cavity preparations / dental implant 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.
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.
QUICK REVIEW OF PROSTHODONTICS – TNMGRMU SOLVED B.D.S FINAL YEAR QUESTION PA...Arun Kumar
This book contains solved "Prosthodontics & Crown & Bridge" B.D.S final year question paper. This helps the students in their eleventh hour preparation.
Finish lines/cosmetic dentistry course by Indian dental academyIndian 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.
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.
Finish lines/certified fixed orthodontic courses by Indian dental academy 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
Inter-proximal stripping
Prepared by:
Dr Mohammed Alruby
حين سكت اهل الحق عن الباطل توهم اهل الباطل انهم علي حق
Definition: selective reduction of proximal surfaces of certain teeth in order to reduce the mesiodistal width of the teeth to create space in the arch
Names:
Interproximal reduction
Interproximal stripping
Enamel re-approximation
Enamel disking
Odontoplasty
Enamel plasty
Slenderization
Air-rotor stripping
History:
Was introduced by Ballard in 1944, it is used to improve areas of interdental gingival recession (Turverson1980)
Indications:
1- Esthetic contouring of teeth malformed
2- When space requirement to correct the malocclusion below 2.5mm
3- If Bolton analysis shows mild tooth material discrepancy in either of arches
4- It can undertake in the lower anterior segment as an aid of retention
5- It can be undertaking as an adjunctive procedure in adult orthodontic
6- In the case of 1st premolar extraction to balance the Bolton ratio
Contraindications:
1- In young patients as they possess large pulp chamber which increased risk of pulp exposure
2- Patients with high caries index and are susceptible to caries
3- Patient with bad oral hygiene
4- Poorly formed enamel because increased risk for exposure
Advantages:
1- Avoid in border line cases where spaces required in minimal
2- Correct molars and incisors relationship by eliminate excess tooth material
3- More stable contact can be established
Disadvantages:
1- Stripping procedure creates rough surface which attract plaque formation and is caries prone
2- Increase sensitivity of the tooth may occur
3- Alteration of tooth morphology giving un-natural appearance
4- Improper contact between the teeth may invite food impaction and hence periodontal breakdown
Interproximal Procedure
The procedure of enamel stripping involves the following steps:
1- Assessing space requirements:
a- Model analysis:
- Arch parameter in upper arch and Carey’s analysis in lower
- Bolton analysis
- Peck and Peck ratio
= if arch discrepancy between 0 --- 2.5mm select stripping
2.5 ---5mm extraction of 2nd premolars
5mm and more, extraction of 1st premolars
= it has been reported that 11----13.5% of populations have overall Bolton ratio problem and
22 ---30% of orthodontic populations have anterior Bolton ratio problem (tooth size discrepancy TSD)
= estimate the mesiodistal dimension to the labiolingual thickness of lower incisors at cingulum that is 88% --- 92% -- for lower central, 90% ---95% ---- for lower lateral, long ratio need proximal re-contouring
b- Radiographs:
Intra-oral periapical radiograph gives an idea about enamel thickness and rough estimate of proximal enamel amount
Panoramic radiograph to assess the proximity of roots
c- Diagnostic set up:
Help in treatment planning of alignment problems
2- Enamel thickness: amount of enamel:
= there are gender and ethnic variat
Smile design and golden proportions.
-Shade estimation, Color, the dimensions;
(Hue, Chroma, and Value).
-Occlusion and Aesthetics; Principles of occlusion,
-Anterior guidance, Occlusal plane.
university of babylon. Dental collage. جامعه بابل . كلية طب الاسنان. امير حمدي العميدي. امير العميدي
Sterilization and Infection Control in dentistry, Aesthetic Restorative Dentistry,Closed sandwich technique,Principles of aesthetic dentistry, Facial composition,
From anatomical view the permanent maxillary lateral incisor same as the permanent maxillary central incisor in function, form and anatomy, and smaller in all dimensions except length of the root.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
How to Make a Field invisible in Odoo 17Celine George
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Model Attribute Check Company Auto PropertyCeline George
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Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
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!
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.
3. 1. Biological considerations A) prevention of damage during
tooth preparation of :
a. adjacent teeth:
- use metal matrix band.
- use thin, tapered diamond.
- common clinical error.
– tipping diamond away from adjacent proximal surface.
b. soft tissue - eg ; tongue, cheek, oral mucosa, peeriodontal
ligament, gingiva - use ;
aspirator tip, mouth mirror, flanged saliva ejector, tongue depressor,
rubber dent - great care needed to protect tongue ; especially when
lingual surface of mandibular molars are prepared - for pulp ;
prevent pulpal injuries
; causes - temperature, chemical irritation,
4. (Causes of Injury)
1.Temperature - friction from heat generated - rotatory instrument -
excessive pressure - type, shape, condition of cutting instrument -
how to prevent ; a. use water spray - to remove debris b. make
shoulder & chamfer finish line c. slow speed handpiece d. avoid
high pressure
2. Chemical action - bases, restorative resins, solvents, luting agents
- these cause pulpal damage - how to prevent ; a. use cavity
varnish b. use dentin bonding agent
adv : effective barrier disadv : effect retention
3. Bacterial action
- from microleakage - how to prevent ; a. zn phosphat cement
b. chlorhexidine gluconate disinfecting solutions (consepsis)
c. remove all carious dentin before placement of restoration d. not
recommended ! - indirect pulp capping
5. B) conservation of tooth structure why we have to conserve ; -
thickness of dentin inversely proportional to pulpal response -
damage to odontoblastic processes affect cell nucleus at dentin-
pulp interface how to conserve ;
1. use partial-coverage crown.
2. min convergence angle between axial walls (taper).
3. preparation of occlusal surface- reduction follow anatomical planes
give uniform thickness.
4. preparation of axial surfaces - there's enough thickness of residual
tooth structure surrounding pulpal tissue - teeth should orthodontically
repositioned.
5. select margin geometry - must be conservative - compatible with
tooth preparation.
6. avoid unnecessary apical extension.
6. C) consideration affecting future dental health axial reduction
Indications :
1. To avoid plaque control.
2. Avoid pdl disease.
3. To avoid poor form and subsequent occlusal dysfunction.
4. Avoid chipping of enamel/cusp fracture.
5. Avoid gingival inflammation
7. How :
1. Tooth preparation must provide sufficient space for development
of good axial contours- enable jucntion between restoration * tooth -
to make smooth & free preparation from ledges.
2. Crown should duplicate contours of original tooth - except for
malaliged/malformed tooth.
3. Slightly undercontoured flat restoration is better - when error is
made - to keep plaque free.
4. Increase proximal contour on anterior crown - to maintain
interproximal papilla 5. sufficient tooth structure must be removed.
8. Margin placement
-whenever possible should be SUPRAGINGIVAL!
-advantages of supragingival
1. easily finished w/o associated with soft tissue trauma.
2. kept plaque free.
3. impressions are more easily made.
4. restoration can be easily evaluated at the time of
placement and at recall appointment.
5. situated on hard enamel.
9. -Should use subgingival margin placement if ;
1. no indication of dental caries, cervical erosion.
2. proximal contact area extends to gingival crest.
3. additional retention/resistance is needed.
4. margin of PFM crown is to be hidden behind labiogingival
crest.
5. indication of modification of axial contour.
6. short crown – min height 3.5mm.
10. margin adaptation
1. Consider the junction between restoration and tooth- potential site
for recurrent caries.
2. Increase adaptation will decrease caries and decrease pdl disease.
3. Smooth and even margin.
4. Preparing smooth margin cannot be overemphasized.
11. Margin geometry
- Guidelines should be considered ;
1. To ease of preparation w/o overextension or undermined enamel.
2. Ease of identification in impression/die.
3. distinct boundary for easy finishing of wax pattern 4. sufficient
bulk of material- enable wax patterm to be handles w/o distortion -
give restoration strength - give esthetics when porcelain is used.
5. conservation of tooth geometry.
12. occlusal reductions
1. need considerable reduction to compensate supraeruption of
abutment teeth.
2. if too much reduction will shorten axial wall and reduce the
retention and resistance.
preventing tooth structure
1. cuspal fracture occur from bruxism.
2. tooth preparation is designed to min destructive stresses- complete
cast better than onlay and inlay.
13. 2. Mechanical considerations
Aim – to prevent dislodgement or distortion or fracture of the
restoration during service 3 categories :
a. Retention form.
b. Resistance form.
c. Prevent deformation of restoration.
14. A) Retention form
def : resistance that prevents restoration from becoming dislodged by
such forces parallel to path of placement (vertical direction) five
factors :
1. magnitude of dislodging
forces def : forces that tend to remove a cemented restoration along its
p.o.p.
: disclose forces > seating force
causes : pulling with floss under connectors.
: eat sticky food
factors affecting : stickiness of food
: surface area of restoration
: surface texture of restoration
15. 2. geometry of tooth preparation
- cement is effective if restoration has single p.o.p
- the best shape is cylindrical
- if overtapered : cemented restoration not constrained by preparation
: restoration has multiple paths of withdrawal
16. - Factors affecting
1. taper (decrease taper, increase retention)
- Def : convergence of tow opposite external walls of tooth
preparation
- Theory : parallel walls – max retention
- Mechanically : 6 degrees – optimum for max retention
- Too small degree– undercuts
- Too large degree-– lack of retention
- Recommended to use grooves to decrease displacement
17. 2. surface area (increase s.a, increase retention)
- Depends on length of this p.o.p
- Occlusal surface not include
-Tall crown > retentive than short crown
- Molar crown > retentive than premolar crown
18. 3. stress concentration (decrease s.c, inccrease retention)
- Lead to cohesive & adhesive failure
- Causes : sharp occlusoaxial line angle
: stress not uniform and concentrated
- Should make roundation of all line angles
4. type of preparation
- Complete crown > retentive than partial crown
19. 3. Roughness of surfaces being cemented
- Increase roughness, increase retention
- Use : air abrasion, tin plating, acid etching
4. Materials
- Increase the reactivity of alloy, increase adhesion, increase
retention
- Base metal alloy (high gold content) > retentive than less reactive
metal
- Complete resin > retentive than amalgam
5. film thickness
- 25mm
6. type of luting agent
- adhesive resin cement (most retentive)
20. B) Resistance form
def : features that enhances the stability of a restoration and resist
horizontal/lateral dislodgement three factors :
1. magitude and direction of dislodging forces
- Mastication – cause horizontal/oblique/lateral dislodgement
- Lateral force tend to displace restoration by rotation around gingiva
margin
- Individual biting force – 4340N (443kg)
- Complete cast crown can withstand more than 13500N (1400kg)
21. 2. geometry of tooth preparation
- Increase taper/increase diameter/decrease height lead to decrease
resistace how to increase resistance :
- Acceptable degree of convergence (taper) : 5-22 degress
- Min wall height : 3.5-4mm
- Make pyramidal preparation
- Make grooves/boxes
- Pinholes
- Complete crown - u-shaped grooved/flared boxes
3. physical properties of luting agent
- Highest compressive strength : Glass Ionomer
- Highest MOE : Zinc Phosphate
22. C) Preventing deformation
1. Alloy selection
- Type I and II gold alloy : intracoronal cast restorations
- Type III and IV gold alloy : crown
- Metal-ceramic alloys with high noble metal content = type IV
- Nickel-chromium alloys (harder)
23. 2. adequate tooth reduction
- To get sufficient bulk of tooth to withsatnd occlusal forces
- Make func cusp (1.5mm) : mand – buccal
: max – palatal/lingual
- Make non func cusp (1mm) : mand – palatal/lingual
: max – buccal
- For malaligned/overerupted/supraerupted tooth (reduction >
1.5mm)
24. 3. margin design
- Prevent distortion by :
- a. Design outline form
- b. Avoid occlusal contact
- c. Keep preparation margin 1-1.5mm away from occlusal contact
areas
- d. Maintain adequate dentin thickness
- e. Make grooves/ledged/ant pinledge retainers