Dentosphere : World of Dentistry

Removable Orthodontic Appliance MCQs Removable Orthodontic Appliance MCQs 1. Adams cribs can fracture in use if the: A. Wire is too soft B. Tags are high on the bite C. Base plate is too thick D. Arrowheads are too small 2. How/where should wire be bent to activate a correctly made palatal canine retractor? A. Between the coil and tooth, but close to the coil B. Between the coil and tooth, but close to the tooth C. Between the coil and its insertion into the base of the palate D. By opening out the coil 3. An anterior bite plane is used in correction of: A. Anterior cross bite B. Deep bite C. Open bite D. All of the above 4. Posterior bite plane is used in correcting: A. Deep bite B. Anterior open bite C. Anterior cross bite D. Posterior cross bite 5. Example of a semifixed orthodontic ap...

# 'Torque' in orthodontics refers to: A. The change in mesiodistal inclination of teeth B. The change in labiolingual inclination of teeth C. The rotation of teeth D. None of the above # Resorption in case of ideal orthodontic tooth movement should be: A. Undermining B. Frontal C. Indirect D. Necrotic # In orthodontic tooth movement which is involved: A. Osteoblast B. Osteoclast C. Both A and B D. None

# Fluoride rich materials include: A. Silicate cement B. Glass ionomer cement C. Poly carboxylate cement D. All of the above # Glass ionomer cements are composed of: A. Alumina silicate powder and phosphoric acid B. Aluminosilicate powder and polyacrylate C. Zinc oxide powder and phosphoric acid D. Zinc oxide powder and polyacrylate Liquid # Which one of the following dental cement accelerates the formation of reparative dentin? A. Eugenol B. Calcium hydroxide C. Zinc oxide D. Silica # Minimum thickness for type I zinc phosphate cement should be: A. 15 microns B. 25 microns C. 50 microns D. 100 microns

 # The bone of tooth socket is called: A. Alveolar process B. Alveolus C. Gomphosis D. Cancellous bone The correct answer is A. Alveolar process. The bone of the tooth socket is called the Alveolar process. Here’s a brief explanation of the terms: Alveolar process: The bony ridge in the jaw that contains the sockets (alveoli) for the teeth. Alveolus: Refers specifically to the individual tooth socket itself. Gomphosis: The fibrous joint between a tooth and its socket. Cancellous bone: A type of bone tissue that is spongy and found within the alveolar process, but it is not specifically the term for the socket. So the correct answer is A. Alveolar process.

 # Number of surfaces of an anterior tooth is: A. 5 B. 3 C. 4 D. 6 The correct answer is C. 4. The number of surfaces of an anterior tooth is typically 4. Anterior teeth, which include incisors and canines, generally have the following surfaces: Facial (or Labial): The surface facing the lips. Lingual: The surface facing the tongue. Mesial: The surface closest to the midline of the dental arch. Distal: The surface farthest from the midline. Therefore, the correct answer is C. 4.

 # Universal tooth numbering system was given by: A. ADA in 1968 B. WHO adopted C. Adolph Zsigmondy D. Palmer The correct answer is A. ADA in 1968. The Universal Tooth Numbering System, developed by the American Dental Association (ADA) in 1968, is a standardized method used primarily in the United States for identifying and labeling teeth. Here’s a detailed breakdown of its components and significance: Overview of the System Numbering Convention: The system assigns a unique number to each tooth, starting from the upper right third molar (tooth #1) and moving across the upper arch to the upper left third molar (tooth #16). The numbering then continues with the lower left third molar (tooth #17) and goes across the lower arch to the lower right third molar (tooth #32). This creates a simple, sequential numbering system that allows for easy identification of each tooth. Tooth Types: The system includes all types of teeth: incisors, canines, premolars, and molars. For example, incisor...

 # What is the area of biopsy of an ulcer? A. Center of ulcer  B. Edge of ulcer  C. Adjacent mucosa  D. Margins of ulcer The correct answer is B. Edge of ulcer. The edge of the ulcer is the preferred site for biopsy because it is most likely to contain a mixture of both the pathological tissue and relatively healthy tissue, making it easier to assess the nature of the lesion. The center of the ulcer may contain necrotic tissue, which can obscure diagnosis, while adjacent mucosa and margins might not provide the necessary diagnostic material. While the terms "edge" and "margin" may seem similar, in the context of ulcer biopsy, they refer to different areas: Edge of the ulcer: This refers to the transitional zone where the ulcerated tissue meets the adjacent normal or mildly affected tissue. It contains a mix of pathological changes (inflammation, dysplasia, or neoplastic transformation) and some relatively intact tissue. This makes it ideal for biopsy because it prov...