Dentosphere : World of Dentistry

 # Head diameter of a 245 bur is: A. 0.1 mm B. 0.5 mm C. 0.8 mm D. 0.9 mm The correct answer is C. 0.8 mm. No. 245 bur has a head length of 3 mm and head diameter of 0.8 mm. This is an inverted cone carbide bur used for amalgam cavity preparations.  Benefits of the bur:  • For amalgam cavity preparations, the initial punch cut should have a depth of 1.5 mm, so it is half of this bur length, so it is very convenient to use the bur.  • In class II the proximal ditch cut is established easily with the 0.8 mm diameter bur end cuts 0.5 mm into dentin and 0.3 mm into enamel. 

 # During countercurrent mechanisms, which of the following area of nephron does filtrate become hypertonic to plasma? A. Bowman’s capsule B. Proximal convoluted tubule C. Loop of Henle D. Distal convoluted tubule The correct answer is C. Loop of Henle. A circuit of fluid in the loop of Henle—an important part of the kidneys—allows for gradual buildup of the concentration of urine in the kidneys, by using active transport on the exiting nephrons (tubules carrying liquid in the process of gradually concentrating the urea). The active transport pumps need only to overcome a constant and low gradient of concentration, because of the countercurrent multiplier mechanism.

 Sectional NiTi wires can also be used to align a malpositioned tooth in a piggyback manner where rest of the arch is ligated with a stiff wire. With this arrangement, a light continuous force is exerted to bring the displaced tooth into the alignment while reciprocal force is distributed over the anchor teeth.  Case done by: Dr. Sushant Pandey, CODS BPKIHS Piggyback wires offer the potential to combine wires of similar or, more commonly, markedly different physical properties. In relation to space redistribution and alignment, piggybacks typically involve use of flexible round NiTi wires in combination with more rigid base arch wires permitting alignment of displaced teeth limiting the effect of reactive forces in terms of horizontal and vertical anchorage.  Reference:  1. Kharbanda, Om. (2013). Orthodontics: Diagnosis and Management of Malocclusion and Dentofacial Deformities 2nd ed..  2. Fleming, P., Seehra, J., 2019. Fixed Orthodontic Appliances. BDJ Cl...

 The atmosphere within a dental clinic plays a pivotal role in shaping patients' perceptions and experiences. Dental professionals recognize the importance of creating a welcoming and comfortable environment that goes beyond the clinical aspect of oral care. The interior design of a dental clinic is an art and science that seamlessly combines aesthetics, functionality, and the unique needs of the dental practice. Let's delve into the key considerations that make dental clinic interior designing an essential aspect of the overall patient experience. 1. Balancing Functionality and Aesthetics: Dental clinics require a careful balance between functionality and aesthetics. The layout should be designed to optimize workflow for dental practitioners while providing a warm and inviting atmosphere for patients. Well-designed reception areas, consultation rooms, and treatment spaces contribute to a positive overall experience. 2. Patient Comfort and Relaxation: Dental anxiety is a common...

  # The preferred agent for base formation below restorative resin is: A. Calcium hydroxide B. Cavity varnish C. Zinc oxide-eugenol cement D. None of the above # Dentin protection during cavity restoration is most important when the "remaining dentin thickness" is: A. 1 - 2mm B. 1.5 mm C. 0.5 - 1mm D. 0.5 mm # Cavity varnish is indicated under amalgam restorations to: A. Prevent galvanic currents from reaching the pulp B. Improve the marginal seal of the restorations C. Seal the dentinal tubules completely D. Act as an effective thermal insulator # Calcium hydroxide is preferred to ZOE fillings below a composite resin restoration as: A. Calcium hydroxide forms a calcific bridge B. Eugenol irritates the inflamed pulp C. Eugenol interferes with the setting of composite resins D. None of the above # When using the acid etch technique to restore a Class IV fracture, exposed denti...

  # In class II cavity for inlay, the cavosurface margin of the gingival seat clears the adjacent tooth by: A. 0.20 ± 0.05mm B. 0.50 ± 0.20mm C. 0.80 ± 0.35mm D. 1.10 ± 0.45mm # Cavities beginning in the proximal surfaces of bicuspids and molars are: A. Class 1 B. Class 2 C. Class 4 D. Class 6 # Incipient caries consists of opaque, chalky white areas that appear when the tooth surface is dried, this is referred as: A. white spot B. hot spot C. translucent zone D. body of lesion # Pit and fissure caries is seen in: A. Class I B. Class I compound C. Class II D. Class II compound # Smear Layer consists of: A. Enamel debris B. Micro organisms C. Dentinal chips D. all of the above # A butt joint is a: A. 90° joint B. 120° joint C. 70° joint D. 180° joint # Enameloplasty is: A. Filling of enamel fissures with amalgam B. Elimination of shallow...

 # The most reliable sign of sexual maturity in girls is: A. Change in voice B. Age at first menstruation C. Appearance of pubic hairs D. Breast development The correct answer is B. Age at first menstruation. An interesting phenomenon of the last 300 or 400 years, particularly the 20th century, has been a generalized increase in size of most individuals. There has also been a lowering in the age of sexual maturation, so that children recently have grown faster and matured earlier than they did previously. Since 1900, in the United States the average height has increased 2 to 3 inches, and the average age of girls at first menstruation, the most reliable sign of sexual maturity, has decreased by more than 1 year. This “secular trend” toward more rapid growth and earlier maturation continued in most countries throughout the 20th century (e.g., the mean age in Poland in 1982 to 1984 was 13.2 years, and 12.8 years in 1992 to 1994) but seems to be leveling off in the developed countries...