Dentosphere : World of Dentistry

# Excess height of the posterior palatal seal of a complete maxillary denture will usually result in which of the following? A. Increased retention B. A tingling or tickling sensation C. Unseating of the denture D. Gagging The correct answer is C. Unseating of the denture. Over contouring or excessive beading of the posterior palatal seal causes too much pressure to be exerted on the palatal tissues resulting in the unseating of upper dentures.  The posterior palatal seal is typically placed approximately on the vibrating line between the hard and soft palate and provides a physiologically acceptable tissue pressure within the compressible portion of the soft palate to attain retention and peripheral seal.  Over extending the coverage of seal will cause gaggling and painful swallowing for the part of the patient.  CLICK HERE FOR MORE MCQS

# A denture that is fabricated with excessive Vertical Dimension of Occlusion (VDO) may result in: A. Inefficient mastication B. Perioral rhytides (wrinkles) C. Trauma to supporting soft tissue D. Sagging oral commissures The correct answer is C. Trauma to supporting soft tissue.  Perioral rhytides, sagging oral commisures and deep labiomental groove is an indication that the vertical dimension of occlusion is insufficient.  Excessive vertical dimension of occlusion (VDO) causes pain in the soft tissue under the denture because excessive force is created during occlusion.  Excessive VDO manifests as a "full mouth" as well as a difficulty pronouncing words.  CLICK HERE TO PRACTICE MORE MCQS

# Which of the following are most sensitive to X ray? A. Tooth buds and salivary glands B. Nerve and muscle tissue C. Hair and nails D. Cartilage The correct answer is A. Tooth buds and Salivary glands CLICK HERE TO PRACTICE MORE MCQS

# Which of the following is an example of non keratinized gingival tissue? A. Outer gingival epithelium  B. Gingival col C. Marginal gingiva  D. Attached gingiva The correct answer is B. Gingival col. The gingival tissue is made up of 75% Para keratinized epithelium, about 15 % keratinized and only 10% non keratinized epithelium. The keratinized area of the gingiva includes the attached gingiva and some portions of the outer gingival epithelium.  The para keratinized gingiva includes the marginal gingiva and portions of the outer gingival epithelium. The non keratinized portion of gingiva includes the gingival col, junctional epithelium and sulcular epithelium. CLICK HERE TO PRACTICE MORE MCQS

A 29 year old postnatal woman who had delivered a baby on 24th Baisakh 2077, at Institute of Medicine, Teaching Hospital, Maharajgnj and had been discharged on 25th Baisakh 2077 died due to complications arising due to Corona Virus Infection. When she developed symptoms like difficulty in breathing, she was brought to Dhulikhel Hospital for emergency treatment. This is the first official Case of COVID-19 in Nepal which took a life. The total number of infected people has reached 281. Nepal is on the 54th day of  a nationwide lockdown, since 12th Chaitra 2076.

# Main component of bacterial plaque: A. Bacteria and Food Product B. Bacteria and Bacterial products C. Food debris and salivary mucins D. Degenerating epithelial cells and salivary mucins # Inorganic component of plaque is formed of: A. Calcium and fluoride B. Calcium and sodium C. Calcium and Phosphorous D. Sodium and Calcium

(B-98)                                                                                                8th May 2000 B.P. KOIRALA INSTITUTE OF HEALTH SCIENCES, DHARAN, NEPAL 2nd Year MBBS Unit-5 Internal Assessment, May 2000 Paper - III B (CNS) SHORT ANSWER QUESTIONS Time: 2 hours                                                                                                            Maximum Marks: 125 Please answer each section in a separate answer book. ...

(B-98)                                                                                                                                                                  8th May 2000 B.P. KOIRALA INSTITUTE OF HEALTH SCIENCES, DHARAN, NEPAL 2nd Year MBBS Unit-5 Internal Assessment, May 2000 Paper - III B (CNS) MULTIPLE CHOICE QUESTIONS Time: 1 hour                                                                ...

1. The following chemically bond to the tooth: A. Composite resin. B. Dental sealants. C. Glass ionomer cement. *** D. All of the above. 2. Compomer restorative materials are: A. Glass ionomer with polymer components B. Resin systems with fluoride containing glasses. *** C. Composite resin for cervical restorations only. Explanation: The composition of compomers is similar to that of a dental composite however it has been modified, making it a polyacid-modified composite. This results in compomers still requiring a bonding system to bond to tooth tissue. Although the name compomer implies that the material possesses a combination of characteristics of both composite and glass ionomers, these materials are essentially polymer-based composites that have been slightly modified to take advantages of the potential fluoride-releasing behavior of glass ionomers. 3. Loose enamel rods at the gingival floor of a class II amalgam cavity should be removed using : A. Straight chisel...

# Carotid sheath contains all except: a) External carotid artery b) Vagus nerve c) Internal jugular vein d) Internal carotid artery The correct answer is A. External carotid artery

# Which of the following structure is not present on the internal surface of mandible? a) Lingula b) Genial tubercle c) Mylohyoid ridge d) Mental foramen  The correct answer is D. Mental foramen. CLICK HERE TO PRACTICE MORE MCQS

# Which is not a part of brainstem? a) Midbrain b) Cerebellum c) Medulla oblongata d) Pons  The correct answer is B. Cerebellum.

Hardness –– Hardness is defined as the ability of a material to resist scratching. –– Can be divided into microhardness and macrohardness. Tests for Microhardness: - Knoop Hardness Test - Vickers Hardness Test Tests for Macrohardness: - Brinell hardness - Rockwell hardness 1. Brinell Hardness Test Oldest test employed for determining the hardness of metals A hardened steel ball is pressed under a specified load into the polished surface of a material. The load is divided by the area of the projected surface of the indentation, and the quotient is referred to as the Brinell hardness number, usually abbreviated as BHN. For a given load, the smaller the indentation, the larger is the number and the harder is the material. Used extensively for determining the hardness of metals and metallic materials used in dentistry It is related to the proportional limit and ultimate tensile strength of dental gold alloys. 2. Rockwell Hardness Number  Is somewhat similar t...

# Among the natural radiation, the one that contributes to more radiation exposure of general population: A. Cosmic B. Terrestrial C. Radon D. Consumer products # X rays cause radiation damage primarily by their property of: A. Penetration B. Radioactivity C. Electromagnetic induction D. Ionisation

# The most radiosensitive cells in the body are: A. Endothelial cells B. Epithelial cells C. Red blood cells D. White blood cells The correct answer is D. White blood cells.

# Identical twins are produced by fertilization of: A. 1 ovum by 1 sperm B. 2 ova by 1 sperm C. 1 ovum by 2 sperms D. 2 ova by 2 sperms The correct answer is: A. 1 ovum by 1 sperm Twins can be either  monozygotic  ('identical'), meaning that they develop from one  zygote , which splits and forms two  embryos , or  dizygotic  ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

# The leading cause of childhood gingivostomatitis in children aged 1 to 3 is: A. Herpes Simplex B. Chicken pox C. Influenza D. Rubella The correct answer is A. Herpes simplex The primary infection (primary herpetic gingivostomatitis) usually occurs in a chlld  under ten years of age who has had no contact with the Type I herpes simplex virus  and who therefore has no neutralizing antibodies. It may also affect young adults (15-25).  Nearly all primary infections are of the subclinical type (they may only have flu-  like symptoms) and one or two mild sores in the mouth which go unnoticed by the  parents. In other children, the primary infection may be manifested by acute symptoms (acute  herpetic gingivostomatitis). These include fever; irritability; cervical lymph adenopathy; fiery red gingival tissues; and small, yellowish vesicles that rupture  and result in painful ulcers on the free and attached mucosa. The most serious  potentia...