Dentosphere : World of Dentistry

 # Which of the following is a derived cephalometric landmark? A. Nasion  B. ANS C. Gnathion D. Orbitale The correct answer is C. Gnathion Anatomic landmarks: These landmarks represent actual anatomic structures of the skull. E.g. Nasion, ANS, PNS, orbitale, pogonion, etc.  Derived landmarks: These are landmarks that have been srbitrarily obtained secondarily from anatomic structures in a cephalogram. E.g. Sella, gnathion, articulare, point PTM, machine porion, etc. They are not anatomical points.  Gnathion: Gnathion is a coonstructed point at the junction of most anterior (Pogonion) and most inferior  part (menton) of the chin.  CLICK HERE TO VIEW MORE MCQs

 # The process of preparing ceramic prosthesis from glassy ingot is: A. Casting B. Slip casting C. Heat pressed D. Copy milling The correct answer is: A. Casting. Dental ceramics are formed into prosthetic shapes and configurations through a variety of processes including sintering, casting, hot isostatic pressing, copy milling, and CAD CAM machining. - Ceramic prosthesis from glassy ignots is produced by casting. CLICK HERE FOR MORE MCQs

 # In humans, preterm birth refers to the birth of a baby of less: A. Than 37 weeks gestational age B. Than 41 weeks gestational age C. Than 30 weeks gestational age D. Than 38 weeks gestational age The correct answer is A. Less than 37 weeks gestational age. In humans preterm birth is the birth of a baby of less than 37 weeks gestational age. Premature birth is defined either as the same as preterm birth or the birth of a baby before the developing organs are mature enough to allow the survival of the baby after it is born. Several organ systems mature between 34-37 weeks in the normal human fetus to reach adequate maturity.  One of  the main organs greatly affected by premature birth is the lungs. The lungs are one of the last organs to develop. Because of this, premature babies typically spend the first days/weeks of their life on a ventilator.  CLICK HERE FOR MORE MCQs

# Cavernous sinus thrombosis is due to infection of: A. Pterygoid plexus B. Submental space C. Maxillary sinus D. Submandibular space # Muscle responsible for opening of mandible: A. Lateral pterygoid B. Medial pterygoid C. Temporalis D. Buccinator

 This is a list of all dental clinics in Pokhara where the practitioner is a Nepal Medical Council registered Dental Surgeon. The NMC number of the Practicing Dental Surgeon has been verified by cross checking on the  Website of Nepal Medical Council.  You can be assured of getting treatment from a registered Dental Surgeon if you visit any of these clinics as per your convenience. CLICK HERE TO VIEW ALL DENTAL CLINICS OF NEPAL LISTED PROVINCE-WISE # Smile Pokhara Dental Clinic, Newroad, Pokhara # Tulip Dental and Implant Clinic, Pokhara, Harichowk # Smilemakers Dental Clinic Pvt. Ltd. Lakeside, Pokhara # Miracle Dental Care, Prithvichowk, Pokhara # Star Dental Clinic, Pokhara-6, Lakeside # Happy Dental Clinic, Simpani, Pokhara CLICK HERE TO VIEW ALL DENTAL CLINICS OF NEPAL LISTED PROVINCE-WISE

 This is a list of all dental clinics in Lalitpur District of Kathmandu Valley where the practitioner is a Nepal Medical Council registered Dental Surgeon. The NMC number of the Practicing Dental Surgeon has been verified by cross checking on the  Website of Nepal Medical Council.  You can be assured of getting treatment from a registered Dental Surgeon if you visit any of these clinics as per your convenience.  CLICK HERE TO VIEW ALL DENTAL CLINICS OF NEPAL LISTED PROVINCE-WISE # Yala Dental and Oral Surgery Clinic, Lalitpur-1, Kupondole # Tooth Fairy Dental Clinic, Lalitpur-7, Gwarko # Cosmo Dental Clinic, Lalitpur-3, Jhamsikhel # Sydney Dental Clinic, Kumaripati, Lalitpur # Decure Speciality Clinic, GM complex, Mahalaxmisthan road, Lagankhel, Lalitpur # Udaya Dental Service Centre, Pulchowk, Damkal Stop, Lalitpur # Care Dental and Maxillofacial Center, Kupondole, Lalitpur # Dentistree The Dental Clinic, Jawalakhel, Lalitpur # TM Dental Clinic/ Sherchan's Dental Cl...

 This is a list of all dental clinics in Kathmandu Valley where the practitioner is a Nepal Medical Council registered Dental Surgeon. The NMC number of the Practicing Dental Surgeon has been verified by cross checking on the  Website of Nepal Medical Council.  You can be assured of getting treatment from a registered Dental Surgeon if you visit any of these clinics as per your convenience.  CLICK HERE TO VIEW ALL DENTAL CLINICS OF NEPAL LISTED PROVINCE-WISE # Blue Cross Dental Clinic, Tripureshwar, Kathmandu # Shankhamul Dental Care Pvt. Ltd., Shankhamul, Kathmandu # Shining Smile Dental Clinic, New Baneshwar, Kathmandu # Aram Dental Care Home, New Baneshwar, Kathmandu # Smile Square Dental Care Centre Pvt. Ltd. Narayan Gopal Chowk, Maharajgunj, Kathmandu # Manash Dental Health Centre Pvt. Ltd. Anamnagar, Kathmandu # Smile The Dental Clinic Pvt. Ltd. Boudha, Patitar, Kathmandu # Yala Dental and Oral Surgery Clinic, Lalitpur-1, Kupondole # Radhakrishna Smiles De...

# Phrenic nerve mainly supplies: A. Diaphragm B. Stomach C. Ileum D. Esophagus # Which of the followiing is not true about facial nerve? A. It has small sensory and large motor root B. It supplies anterior belly of digastric C. It gives parasympathetic supply to nasal and lacrimal glands D. It is secretomotor to submandibular salivary glands

# Palatine process begins to fuse at: A. 12 weeks post fertilization B. 10 weeks post fertilization C. 8 weeks post fertilization D. 6 weeks post fertilization # Lymph nodes of tongue is drained by all EXCEPT: A. Ventral vessels B. Posterior vessels C. Dorsal vessels D. Central vessels # Infection of lower lip first reaches the bloodstream through: A. Inferior labial vein B. Inferior labial artery C. Brachiocephalic vein D. Pterygoid plexus # Medial movement of head of condyle is brought by: A. Buccinators B. Lateral Pterygoid C. Masseter D. Medial pterygoid # Carbon monoxide transfusion in lung is diffusion limited as: A. Carboxy hemoglobin has high avidity B. Base of the lung is poorly ventilated C. pCO2 rises in blood immediately on exposure D. Diffusion of CO across blood gas barrier is slow # Which is not a mechanism of heat loss? A. Peripher...

 # In  case of orthodontically treated midline diastema which retainer should be used? A. No need for retainer B. Hawley appliance for 6 months C. Lingual bonded retainer D. Hawley appliance for 12 months The correct answer is C. Lingual bonded retainer. Fixed (bonded) orthodontic retainers are normally used in situations where  intra-arch instability is anticipated and prolonged retention is planned.  There are four major indications: - Maintenance of lower incisor position during late growth - Diastema closure maintenance - Maintenance of pontic or implant space - Keeping extraction spaces closed in adults CLICK HERE FOR MORE MCQs

 # Best investment for casting base metal crowns is: A. Phosphate bonded investment B. Gypsum  bonded investment C. Ethyl silicate  D. High grade silicate bonded The correct answer is: A. Phosphate bonded investment. Gypsum bonded investments are used for casting gold alloys. These can withstand a temperature of 700 degree C. Base metal alloys, high melting gold alloys, which are used for metal ceramic restorations, are invested by phosphate bonded investments. Silica bonded investments are an alternative to the phosphate bonded investments, for high temperature casting. They are used in the casting of base metal alloy partial dentures.  CLICK HERE FOR MORE MCQs

 The different stages of anesthesia are: Stage I: Analgesia and conscious sedation Stage II: Stage of delirium Stage III: Stage of Surgical Anesthesia                 Plane I: Pupils dilate progressively with the depth of anesthesia. Lid reflex, swallowing,                                            retching  and vomitting gets abolished. Corneal reflex is present. Conjunctival                                          reflex is absent. Pharyngeal reflex is lost.                  Plane II: Eye balls fixed, laryngeal reflexes are also abolished.                  Plane III: Asynchrony between thoracic and abdominal movements. Progressive ...

 # Which of the following is true about herpetic gingivostomatitis? A. Common in children B. Affects the gingiva uniformly C. Occurs only in adults D. It occurs on labile mucosa The correct answer is: A. Common in children. - Herpetic gingivostomatitis is common in  preschool children.  - Initially focal areas of the marginal gingiva are red and swollen. - Labile mucosa is commonly involved in recurrent aphthous ulcers. CLICK HERE FOR MORE MCQs

 # The color matching for composites when done in a dry state, would make the tooth appear: A. Darker than the adjacent teeth B. Lighter than the adjacent teeth C. Same as that of the adjacent teeth D. Does not have any effect The correct answer is B. Lighter than the adjacent teeth. Dehydrated or dry tooth appear whiter in shade. CLICK HERE FOR MORE MCQs  

 # The method of choice for removal of interproximal plaque is: A. Unitufted waxed floss B. Multitufted unwaxed floss C. Multitufted waxed floss D. Unitufted unwaxed floss The correct answer is C. Multitufted waxed floss. For  areas of tight interproximal contacts, it is usually easier to use waxed than unwaxed floss. CLICK HERE FOR MORE MCQs

# Buttressing bone formation is: A. Congenital abnormality B. Occurs endosteally C. Occurs periosteally D. Due to trauma from occlusion   The correct answer is D. Due to trauma from occlusion.  - When excessive occlusal forces resorb bone, the bone attempts to reinforced the thinned bony trabeculae with new bone. This attempt to compensate for lost bone is called buttressing bone formation - may be central or peripheral. Peripheral butteressing boine formation is also called lipping.  CLICK HERE FOR MORE MCQs

 # Treatment of odontogenic keratocyst extending into the mandibular ramus is: A. Enucleation without curettage B. Marsupialization without curettage C. Enucleation with peripheral osteotomy D. Enbloc dissection The correct answer is C. Enucleation with peripheral osteotomy. Enucleation with curettage: Enucleation with curettage means that after enucleation, a curette or bur is used to remove 1 or 2 mm of bone around the entire periphery of the cystic cavity. This is done to remove any remaining epithelial cells that may be present in the periphery of the cystic wall or bony cavity. CLICK HERE FOR MORE MCQs

 # In peripheral nerve block, which of the following local anesthetics has the longest duration of action? A. Bupivacaine B. Cocaine C. Lignocaine D. Prilocaine The correct answer is A. Bupivacaine. Bupivacaine and Etidocaine are long acting anesthetics with a duration of action about 180 minutes or even longer and this is due to their increased protein binding property.  Bupivacaine is a potent agent capable of producing prolonged anesthesia. Its long duration of action and its tendency to provide more sensory than motor block has made it a popular drug for providing prolonged analgesia during  labor or the postoperative period.  Bupivacaine and etidocaine are more cardiotoxic than equieffective doses of lidocaine.  CLICK HERE FOR MORE MCQs

 # Bisecting angle technique is based upon: A. ALARA Principle B. SLOB Rule C. Rule of Isometry D. Convergence The correct answer is C. Rule of Isometry. Cieszynski's Rule of Isometry - Used in bisecting angle techniqiue of radiograph - Two traingles are equal when they share one complete side and have two equal angles. - An imaginary line that bisects the angle made by the film and the long axis of the teeth is constructed and central ray of the beam is directed at right angles to this bisector which forms two triangles with two equal angles and a common side (the imaginary bisector) Disadvantages: - To correctly reproduce the length of each root of a multirooted tooth, the central beam must be angled differently for each root. - The alveolar ridge often projects more coronally than its true position. CLICK HERE FOR MORE MCQs

 # Nucleus in Reed-Sternberg cell is also described as ? A. “Owl’s eyes” appearance B. “Spectacle” appearance C. “Ghost” appearance D. “Moon” appearance The correct answer is A. Owl's eyes appearance. A Reed-Sternberg cell is  a large cell with a bilobed nucleus and prominent nucleoli giving an “owl’s eyes” appearance. CLICK HERE FOR MORE MCQs

 # Tetracycline cause tooth discoloration due to formation of: A. Calcium oxalate B. Orthophosphate C. Tetracalcium phosphate D. Calcium oxide The correct answer is B. Orthophosphate. - Presence of tetracycline in the bloodstream promotes deposition of the drug in the developing enamel and dentin of teeth and bones by binding to calcium to form tetracycline-calcium-orthophosphate. - The minimum amount required for tooth discoloration is 21 mg/kg body weight.  - The complex causes discoloration upon eruption and exposure to sun (UV light).   # The discoloration appears as: a) Oxytetracycline (Terramycin)  = Light yellow b) Tetracycline (Achromycin), Demeclocycline = Yellow c) Synthetic tetracycline (Minocycline) = Green to dark gray d) Chlortetracycline (Aureomycin) = Gray - brown (Worst staining) e) Doxycycline and Oxytetracycline = Light Yellow (least staining) CLICK HERE FOR ALL MCQs