Bone grafting involves transplanting bone material from one site to another to aid bone regeneration. There are several types of grafts including autografts, allografts, xenografts, and alloplasts. Autografts are considered the gold standard as they are osteoinductive, osteoconductive, and osteogenic, but require a second surgical site. Allografts risk disease transmission. Bone graft healing relies on revascularization, with cancellous grafts replacing with new host bone within a year, while cortical grafts take longer. Grafting has various applications including alveolar ridge preservation and augmentation, maxillary sinus lifts, and distraction osteogenesis. Complications can include membrane perforation
This is a power point presentation on sinus floor elevation, describing the various techniques, biological aspects and clinical outcomes from a periodontist point of view. It also includes a brief review on the anatomy of maxillary sinus and management of complications.
The maxillary sinuses were first illustrated and described by Leonardo Da Vinci in 1489 and later documented by the English anatomist Nathaniel Highmore in 1651.
The maxillary sinus, or antrum of Highmore, lies within the body of the maxillary bone and is the largest and first to develop of the paranasal sinuses.
Shape- a pyramid-shaped cavity; base- adjacent to the nasal wall; apex- pointing to zygoma.
Size- insignificant until eruption of permanent dentition; average dimensions of adult sinus- 2.5–3.5 cm wide, 3.6–4.5 cm tall, and 3.8–4.5 cm deep; estimated volume of approximately 12–15 cm.
Extent- Anteriorly, extends to canine and premolar area. sinus floor usually has its most inferior point near the first molar region.
Sinus lift procedure: the maxillary sinus elevation and the bone augmentation procedure is technique sensitive, requiring meticulous surgical skills and expertise.
Connect with me @ https://in.linkedin.com/in/drmaggitom
This is a power point presentation on sinus floor elevation, describing the various techniques, biological aspects and clinical outcomes from a periodontist point of view. It also includes a brief review on the anatomy of maxillary sinus and management of complications.
The maxillary sinuses were first illustrated and described by Leonardo Da Vinci in 1489 and later documented by the English anatomist Nathaniel Highmore in 1651.
The maxillary sinus, or antrum of Highmore, lies within the body of the maxillary bone and is the largest and first to develop of the paranasal sinuses.
Shape- a pyramid-shaped cavity; base- adjacent to the nasal wall; apex- pointing to zygoma.
Size- insignificant until eruption of permanent dentition; average dimensions of adult sinus- 2.5–3.5 cm wide, 3.6–4.5 cm tall, and 3.8–4.5 cm deep; estimated volume of approximately 12–15 cm.
Extent- Anteriorly, extends to canine and premolar area. sinus floor usually has its most inferior point near the first molar region.
Sinus lift procedure: the maxillary sinus elevation and the bone augmentation procedure is technique sensitive, requiring meticulous surgical skills and expertise.
Connect with me @ https://in.linkedin.com/in/drmaggitom
socket shield technique is a modified method of implant placement where many short comings of implant placement can be solved...
it is nothing but retaining of buccal cortical plate during extraction and implant is placed immediatly
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
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Dental Implantology compiled in a PPT that cannot be easier and comprehensive than this. Made by my genuine contribution with some part copied from some very good presentations available to me. I have experience of over 900 implant surgeries as on 1st of JUNE 2015.
socket shield technique is a modified method of implant placement where many short comings of implant placement can be solved...
it is nothing but retaining of buccal cortical plate during extraction and implant is placed immediatly
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
Implantology Simplified- All you need to know about Dental ImplantDr. Aman Singh
Dental Implantology compiled in a PPT that cannot be easier and comprehensive than this. Made by my genuine contribution with some part copied from some very good presentations available to me. I have experience of over 900 implant surgeries as on 1st of JUNE 2015.
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Craniomaxillofac trauma reconstr bone graft in cranifacial surgeryIndian 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.
Introduction
Anatomy and Physiology of bone
Bone Tissue Engineering
Recent studies related to bone tissue engineering
Commercialized products and ongoing clinical trials
Biomedical start-ups
Concluding remarks
Introduction
Anatomy and Physiology of bone
Bone Tissue Engineering
Recent studies related to bone tissue engineering
Commercialized products and ongoing clinical trials
Biomedical start-ups
Concluding remarks
Introduction
Anatomy and Physiology of bone
Bone Tissue Engineering
Recent studies related to bone tissue engineering
Commercialized products and ongoing clinical trials
Biomedical start-ups
Concluding remarks
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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
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2. defined as : a bone fragmenttransplanted, whole or in pieces, fromone
site to another
Bone is : the secondmost commonlyimplantedmaterial in the human
body, after blood transfusion
Bone graft
3. Principles of grafting
1.Host bone regeneration capacity
2. Surgical asepsis
3. Host site preparation
4. Optimization of growth factor
5. Graft immobilization
6. Soft tissue coverage
5. Types of bone grafts
•Autograft
•Allograft
•Xenograft
•alloplast
6. Biological mechanism
Osteoconduction
graft material serves as a scaffold for new bone growth
Osteoinduction
Chemical processwich stimulationof osteoprogenitor cells to differentiate into
osteoblasts that then begin new bone formation . The
most widely studiedtype of osteoinductive cell mediators are (BMP)
Osteogenesis
bone formation, fromcells that survive in the graftand are capable of produce
new bone
7. Structure of grafts
Cortical bone
cancellous bone
used primarily for structural support
cancellous bone grafts for osteogenesis
8. Mechanism of bone formation
Mechanism
Mechanism of bone formation in a cancellous cellular bone emanate from survival of theosteoprogenitor
cells (osteoblst & marrow cells)
Transplanted osteoprogenitor cells survive within the recipient tissue for first 3-4 days by a nutritional
diffusion from the surrounding vascular tissue envelop
From 3rd day – capillary buds start proliferation from surrounding tissue. This establish oxygen gradient
Between 3rd and 14th day – complete revascularization occur
9. Healing principles
Mechanism
revascularization of a cancellous graft may be completed within 2 weeks.
In contrast, revascularization of cortical grafts is much slower , due to lack of anastomoses
Grafted cortical bone particles may not entirely be replaced with host bone at the recipient bed
but grafted cancellous bone will be completely replaced by new host bone within the first year after
transplantation
10. Sources of grafts
Inraoral extraoral
Max. tuberosity
Ramus
Symphysis
rib
tibia
Iliac crest
Calvarial bone
Autogenous grafts
11. Autogenous
Disadvantages
Low availability of bone volume
Require a second operative site
Significant patient morbidity
Considered the “ goldstandard ” by which other materials are judged
Osteoinductive, osteoconductive, and osteogenic properties
No risk of infection
Sources of grafts
12. 1.FRESHFROZEN
- Highly antigenic
1.Mineralizedfreezedriedallograft
- Osteoconductive
-Low bioavailabilty and activity of (BMP)
1.Demineralizedfreezedriedbone
-Osteoinductive
-The process exposes BMP
BMP cause differentiation of mesenchymal cells into osteoblasts
Human cadavers source
Method to supress antigenicity
Disadvantages
Risk of disease transmission and unpredictability
Possible infections, and antigenicity risks
MinerOss®
allograft
13. Demineralized freeze dried bone
Mechanism
BMP are associated with the organic matrix of bone and embedded within mineral content, so demineralised
process increases its bioavailability
BMP attract mesenchymal stem cells and induce them to differentiate into chondrocytes leading into endochondral
bone formation.
Endochondral bone formation is attributed to a osteoinductivity response,
while intra-membranous bone formation is indicative of an osteoconductive response
14. Xenograft
Naturally derived hydroxylapatite from bovine, coral
Osteoconductive
Similar structure, chemistry, and porosity of human bone
Disadvantages
Risk of disease transmission
Remains in the defect for years
Continuous macrophage activity
MinerOss®
Sources of grafts
16. Techniques for using autogenous bone gra
Osseous coagulum : blood misture with bone dust
Bone blend : placing bone fragment placed in capsule & tituration
17. Techniques for using autogenous bone gra
Intraoralcancellous bone marrow transplant : from
-max. tuberosity
-healing socket
-edentulous area
Bone swaging :
pushing the bone (of edentulous area adjacent to the defect ) into contact with the
root surface without fractureing its base
Technically diffcult
No longer use
Extraction socket allowed to heal for 2-3 months before reintering
24. Distraction osteogenesis
By llizarov
Biologic process of new bone formation between
surfaces of separated bone segment by traction forces
Gradual lenthening of the bone by application of a
specific device (distractor)
25. Complication of grafting
1. Perforation of the Schneiderian membrane
2. Soft tissue dehiscence
3. Infection
4. Exposure of GBR membrane
5. Mobilisation of the graft
6. Graft resorption
7. Cyst formation
8. Transmission of diseases