Composite Grafts Indian Medical PG Practice Questions and MCQs
Practice Indian Medical PG questions for Composite Grafts. These multiple choice questions (MCQs) cover important concepts and help you prepare for your exams.
Composite Grafts Indian Medical PG Question 1: All of the following factors affect osseointegration EXCEPT:
- A. Biocompatibility of implant material.
- B. Implant design.
- C. Patient's blood type (Correct Answer)
- D. Status of the host bed.
Composite Grafts Explanation: ***Patient's blood type***
- A patient's **blood type** (e.g., A, B, AB, O) is determined by antigens present on red blood cells and plays no direct role in the biological processes of bone healing or the integration of a dental implant with bone.
- While systemic factors can influence osseointegration, blood type itself does not affect the cellular and molecular mechanisms required for direct bone-to-implant contact.
*Biocompatibility of implant material*
- The **biocompatibility** of the implant material (e.g., **titanium**) is crucial for osseointegration, as it must not elicit adverse reactions and must permit host bone growth on its surface.
- Materials that are cytotoxic or inflammatory will prevent bone apposition and lead to fibrous encapsulation rather than direct bone contact.
*Implant design*
- **Implant design**, including features like **surface roughness**, thread pitch, and macro-geometry, significantly influences the initial stability and long-term success of osseointegration.
- A greater surface area and appropriate surface treatments can enhance bone cell attachment and differentiation, promoting faster and stronger bone integration.
*Status of the host bed*
- The **status of the host bone bed** refers to its quality and quantity (e.g., bone density, vascularity), which are critical for the biological processes of osseointegration.
- Adequate bone volume and good bone quality provide a stable foundation and sufficient blood supply for bone regeneration around the implant.
Composite Grafts Indian Medical PG Question 2: Which one of the following is not a wound closure technique?
- A. Composite graft
- B. Vascular graft (Correct Answer)
- C. Partial thickness skin graft
- D. Musculocutaneous flap
Composite Grafts Explanation: ***Vascular graft***
- A **vascular graft** is a tube-like structure used to bypass or replace a diseased or damaged blood vessel.
- Its primary purpose is to **restore blood flow**, not to close a wound on the body surface or replace missing tissue.
*Partial thickness skin graft*
- A **partial thickness skin graft** involves transplanting the epidermis and a portion of the dermis to cover a wound.
- This is a common and effective technique for **wound closure**, particularly for large surface area wounds or burns.
*Composite graft*
- A **composite graft** is a graft consisting of multiple tissue types, such as skin, cartilage, and fat, often used for reconstruction.
- This is a direct method of **wound closure** and tissue replacement, particularly in areas requiring structural support and soft tissue coverage.
*Musculocutaneous flap*
- A **musculocutaneous flap** involves the transfer of skin, subcutaneous tissue, and an underlying muscle to cover a wound.
- This is a versatile **wound closure technique** that provides robust soft tissue coverage and blood supply to complex defects.
Composite Grafts Indian Medical PG Question 3: Best procedure for an injury to the leg with exposed bone and skin loss:
- A. Full thickness grafting
- B. Skin flap
- C. Split skin grafting
- D. Pedicle flap (Correct Answer)
Composite Grafts Explanation: ***Pedicle flap***
- A pedicle flap provides **vascularized tissue** that can cover exposed bone, which requires a robust blood supply for healing and protection.
- This method ensures good **tissue viability** and bulk, crucial for areas with high functional demands and potential for infection like the lower leg.
*Full thickness grafting*
- **Full-thickness skin grafts** are generally too thin to adequately cover exposed bone and do not provide sufficient vascularity or padding.
- They rely entirely on the recipient bed for vascularization, which is poor over exposed bone, leading to a high risk of **graft failure**.
*Skin flap*
- While a generic "skin flap" implies a vascularized tissue transfer, it is less specific than a pedicle flap, which ensures continuous blood supply from the donor site until full integration.
- The term "skin flap" alone doesn't specify if it's a local, regional, or free flap, and **pedicle flaps** are often the most direct and reliable solution for lower leg bone exposure.
*Split skin grafting*
- **Split-thickness skin grafts** are very thin and contain only a portion of the dermis, making them unsuitable for covering exposed bone or tendons.
- They would likely **fail to take** due to lack of a vascular bed and offer no padding or protection against further injury.
Composite Grafts Indian Medical PG Question 4: Which of the following bone defects offers the best chance for bone fill?
- A. 3 Walled defect (Correct Answer)
- B. Hemisepta
- C. Osseous crater
- D. 2 Walled defect
Composite Grafts Explanation: ***3 Walled defect***
- A **3-walled defect** provides the best prognosis for bone fill because it retains the most natural bone structure, enhancing the ability to contain bone graft material effectively.
- The presence of three bony walls offers **excellent support and blood supply** for graft survival and successful bone regeneration.
*Hemisepta*
- A **hemisepta** refers to a one-walled defect, which offers very limited containment for graft materials.
- It has a **poor prognosis** for bone fill due to insufficient support and rapid loss of grafting material.
*Osseous crater*
- An **osseous crater** is a two-walled defect where the buccal and lingual walls are present, but the interproximal walls are missing.
- While better than a one-walled defect, it still presents challenges in graft containment and has a **less predictable outcome** compared to a 3-walled defect.
*2 Walled defect*
- A **2-walled defect** offers less containment and support for bone graft materials compared to a 3-walled defect.
- The reduced number of walls means there is a **higher chance of graft material displacement** and a slower healing process.
Composite Grafts Indian Medical PG Question 5: Feature of third-degree burn:
- A. Whole dermis destroyed (Correct Answer)
- B. Pain present
- C. Transudation of fluid present
- D. Erythematous in appearance
Composite Grafts Explanation: ***Whole dermis destroyed***
- A **third-degree burn** involves the complete destruction of the **epidermis** and **dermis**, extending into the subcutaneous tissue.
- This extensive damage results in a leathery, stiff, and often waxy white, brown, or charred black appearance.
*Pain present*
- Third-degree burns typically cause **no pain** in the burned area itself because the nerve endings in the dermis have been completely destroyed.
- While there may be pain surrounding a third-degree burn due to less severe burn areas, the core third-degree area is numb.
*Transudation of fluid present*
- **Transudation of fluid** (blister formation and significant edema) is a prominent feature of **second-degree burns**, where the epidermis separates from the dermis.
- In third-degree burns, the skin is destroyed, and the protein-rich fluid tends to **coagulate** within the damaged tissues rather than forming blisters or freely transuding.
*Erythematous in appearance*
- **Erythema** (redness) is characteristic of **first-degree burns** and **superficial second-degree burns**, due to vasodilation in the intact dermis.
- Third-degree burns are typically **waxy white, leathery, charred black, or brown**, not red, due to the destruction of blood vessels and tissue necrosis.
Composite Grafts Indian Medical PG Question 6: Gold standard procedure to reduce recurrence of pterygium after surgical excision is
- A. Thiotepa
- B. Amniotic membrane grafting
- C. Conjunctival autograft (Correct Answer)
- D. Beta-radiation
Composite Grafts Explanation: ***Conjunctival autograft***
- **Conjunctival autografting** involves transplanting a piece of healthy conjunctiva from the superior bulbar conjunctiva to the bare scleral bed after pterygium excision, acting as a barrier to fibrovascular proliferation.
- This technique has consistently shown the **lowest recurrence rates** in comparative studies, making it the **gold standard** for preventing pterygium recurrence due to its high success rate and safety profile.
*Thiotepa*
- **Thiotepa** is an **antimetabolite** that inhibits DNA synthesis and cell proliferation, used topically post-excision to reduce recurrence by suppressing fibroblast activity.
- While it can lower recurrence rates compared to simple excision, its efficacy is generally **less than conjunctival autografting**, and it carries risks of corneal toxicity and limbal stem cell deficiency.
*Amniotic membrane grafting*
- **Amniotic membrane grafting** involves placing processed amniotic membrane over the scleral bed, which has anti-inflammatory, anti-scarring, and pro-epithelialization properties.
- It is an effective option, especially for **large pterygia** or for patients at high risk of recurrence, but its recurrence rates are generally **not as low as those achieved with conjunctival autografting**, and the graft can sometimes detach.
*B- radiation*
- **Beta-radiation** (strontium-90) is a form of adjuvant therapy applied to the scleral bed immediately after pterygium excision to inhibit fibroblast proliferation and reduce recurrence.
- It is effective but associated with potential complications such as **scleral melt**, corneal scarring, and cataract formation, making it a less preferred option than conjunctival autografting, especially in primary cases.
Composite Grafts Indian Medical PG Question 7: A Wolfe graft is a
- A. Partial thickness skin graft
- B. Pinch skin graft
- C. Pedicle graft
- D. Large full thickness skin graft (Correct Answer)
Composite Grafts Explanation: ***Large full thickness skin graft***
- A **Wolfe graft** is a type of **large full-thickness skin graft** that includes the epidermis and entire dermis.
- Due to its full thickness, it provides better cosmetic results and less contracture compared to split-thickness grafts, but requires optimal **vascularization** at the recipient site.
- The term "Wolfe graft" specifically refers to the **large size** of the full-thickness graft, distinguishing it from smaller grafts.
*Partial thickness skin graft*
- A **partial-thickness skin graft** (also known as a split-thickness skin graft) includes the epidermis and only a portion of the dermis.
- While easier to harvest and more likely to **take** in less ideal recipient beds, they are known for more contraction and a less cosmetic appearance.
*Pinch skin graft*
- A **pinch graft** is a small, conical piece of skin, including the epidermis and dermis, taken by pinching the skin.
- These grafts are generally less aesthetically pleasing, have limited applications, and are often used for small, non-cosmetic defects.
*Pedicle graft*
- A **pedicle graft** (or flap) is a section of tissue that remains attached to its original site at one or more points, maintaining its own **blood supply**.
- Unlike a free graft, it is not completely detached from the donor site, allowing for transfer of more complex tissues like muscle or bone.
Composite Grafts Indian Medical PG Question 8: In Split thickness graft, which part of the skin is/are included?
- A. Epidermis and dermis
- B. Epidermis only
- C. Epidermis and part of dermis (Correct Answer)
- D. Epidermis, dermis and part of subcutaneous tissue
Composite Grafts Explanation: ***Epidermis and part of dermis***
- A **split-thickness skin graft** includes the entire **epidermis** and only a **portion of the dermis**.
- This allows for easier engraftment and donor site healing due to less deep tissue removal.
*Epidermis and dermis*
- This describes a **full-thickness skin graft**, which includes the entire epidermis and the entire dermis.
- While it provides better cosmetic results and less contraction, it requires a more complex donor site closure.
*Epidermis only*
- A graft consisting only of the epidermis would be too thin to be clinically useful and would likely not survive.
- The dermis provides structural support and a blood supply critical for graft viability.
*Epidermis, dermis and part of subcutaneous tissue*
- This typically refers to a **composite graft** or a **flap**, not a split-thickness skin graft.
- These grafts include deeper tissues, such as subcutaneous fat, to provide bulk and specialized structures.
Composite Grafts Indian Medical PG Question 9: Which of the following statements about mesh skin grafts is not correct?
- A. They allow egress of fluid collections under the graft.
- B. They permit coverage of large areas.
- C. They “take” satisfactorily on granulating bed.
- D. They contract to the same degree as a grafted sheet of skin. (Correct Answer)
Composite Grafts Explanation: ***They contract to the same degree as a grafted sheet of skin.***
- This statement is incorrect because **meshed skin grafts** undergo **greater primary and secondary contraction** compared to unmeshed, full-thickness sheet grafts.
- The fenestrations in the meshed graft allow for stretching and expansion, but this also contributes to increased contraction as the graft heals and remodels.
*They allow egress of fluid collections under the graft.*
- The **fenestrations** created by the meshing process provide small openings that facilitate the **drainage of seroma or hematoma** from beneath the graft.
- This feature is crucial for graft survival as fluid accumulation can lift the graft, impairing nutrient diffusion and leading to graft failure.
*They permit coverage of large areas.*
- Meshing a skin graft allows it to be **expanded to cover an area up to 1.5 to 9 times larger** than the original harvested skin.
- This is particularly useful in managing **large burn wounds** or extensive skin defects where donor sites are limited.
*They “take” satisfactorily on granulating bed.*
- Meshed grafts tend to tolerate **less ideal recipient beds**, such as those with some granulation tissue or minor contamination, better than sheet grafts.
- The fenestrations allow for drainage and better adherence, which can compensate for a suboptimal underlying bed.
Composite Grafts Indian Medical PG Question 10: Wound contraction can be most effectively minimized by:
- A. Allowing secondary granulation
- B. Full thickness grafting (Correct Answer)
- C. Split skin graft
- D. Dressing with placenta
Composite Grafts Explanation: ***Full thickness grafting***
- **Full-thickness skin grafts** include the epidermis and full dermis, which contains **fewer myofibroblasts** than split-thickness grafts, thus minimizing contraction.
- The greater amount of dermal tissue acts as a **mechanical barrier** to prevent excessive wound contraction, providing a more stable and aesthetically pleasing result.
*Allowing secondary granulation*
- Healing by **secondary intention** involves substantial granulation tissue formation, which is rich in **myofibroblasts** and leads to significant wound contraction.
- This method of healing is often used for infected or contaminated wounds but results in the **most contraction**.
*Split skin graft*
- **Split-thickness skin grafts** contain only a portion of the dermis, making them prone to **moderate to significant wound contraction**.
- While better than secondary intention, the thin dermal layer provides less resistance to the contractile forces of the **myofibroblasts**.
*Dressing with placenta*
- **Placental tissue dressings** can promote wound healing by providing growth factors and a scaffold for regeneration.
- However, they do not inherently prevent or minimize **wound contraction** in the same way that a full-thickness graft mechanically does, as they do not replace the entire dermal layer.
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