MDS PREP
Eburnation is seen in
1) Malunion
2) Nonunion
3) Osteomyelitis
4) Osteoradionecrosis
Oral Surgery
Answer: 2
Eburnation is the process of converting living bone tissue into a sclerotic, or hardened, avascular bone due to lack of blood supply. This can occur at the site of a nonunion, which is where a fracture fails to heal properly, and the bone ends remain separate.
"Ash forceps" is commonly used for
1. Extraction of lower incisor
2. Extraction of upper canines
3. Holding tissues prior to biopsy
4. Holding vascular areas during surgery
Ash forceps are commonly used for extraction of lower incisor.
Biopsy specimens removed for examinations are immediately placed in
1) 10 % ethanol
2) 10 % formalin
3) Hydrogen peroxide
4) 1 % formalin
Oral Surgery
Answer: 2
Formalin, specifically 10% neutral buffered formalin, is the standard fixative used for preserving biopsy specimens. It helps to maintain the tissue architecture and cellular details, making it suitable for histopathological examination. Ethanol is not typically used for routine tissue fixation as it can cause tissue shrinkage and distortion. Hydrogen peroxide is not a fixative and is used for different purposes, such as disinfection. A 1% formalin solution is too dilute for effective fixation.
When comparing to the non-myelinated nerve, myelinated nerve requires
1. Higher concentration of anaesthetic agent
2. Lower concentration of anaesthetic agent
3. Same concentration of anaesthetic agent
4. None of the above because no correlation
Oral Surgery
Answer: 1
When comparing to the non-myelinated nerve, myelinated nerve requires a higher concentration of anaesthetic agent.
An essential feature of a comminuted I fracture, is that, the
1. periosteum is intact
2. bone is fractured completely into two parts
3. overlying integument is intact
4. bone is splintered or crushed
Oral Surgery
Answer: 4
Explanation: A comminuted fracture is characterized by the bone being broken into multiple fragments. This type of fracture is often the result of high-impact trauma and can complicate treatment due to the complexity of the fracture pattern.
Among the following which is advantage of sagittal split osteotomy over transoral vertical subcondylar osteotomy
1) Greater mandibular movement is achieved
2) Because it is intraoral procedure. No external scar is produced
3) Alone may be used to correct a mandibular retrognathism and prognathism
4) Less chance of injuring the inferior dental canal
Oral Surgery
Answer: 3
Among the given choices, the advantage of a sagittal split osteotomy over a transoral vertical subcondylar osteotomy is that it allows for greater mandibular movement. The sagittal split osteotomy is a surgical technique used in orthognathic surgery to reposition the mandible in cases of severe skeletal discrepancies. It involves splitting the mandible along the midline and moving the two halves apart, which can provide significant advancement or setback of the lower jaw. This technique may be used to correct both mandibular prognathism and retrognathism, making it a versatile option in orthognathic surgery. Additionally, it is associated with fewer complications compared to the transoral vertical subcondylar osteotomy, which involves cutting through the medullary bone of the condyle and can pose a higher risk of injury to the facial nerve and other vital structures. However, it's important to note that the choice of surgical approach is determined by the specific case and the individual patient's needs.
Among the following which is the rescule breathing in adult?
1) 6 times/min
2) 18 times/min
3) 12 times/min
4) 24 times/min
Oral Surgery
Answer: 3
The recommended rate for rescue breathing in adults is approximately 12 breaths
per minute. This rate allows for adequate ventilation without causing
hyperventilation.
The primary airway hazard for an unconscious patient in a supine position is
1) Tongue obstruction
2) Bronchospasm
3) Laryngospasm
4) Aspiration
Oral Surgery
Answer: 1
In an unconscious patient lying supine, the tongue can fall back and obstruct
the airway due to loss of muscle tone. This is the most common airway hazard in
this position.