Dentosphere : World of Dentistry

 # Well aligned deciduous dentition is an indication of: A. Potential crowding B. Disto occlusion C. Mesio occlusion D. Well aligned permanent teeth The correct answer is: A. Potential crowding Explanation: Well-aligned deciduous dentition (primary teeth) with little to no spacing  is often a predictor of  potential crowding  in the permanent dentition. Primary teeth are smaller than permanent teeth, and deciduous arches typically exhibit natural spacing ("primate spaces") to accommodate the larger permanent successors. If primary teeth are tightly aligned, it suggests insufficient space for the eruption of larger permanent teeth, increasing the risk of crowding. D. Well-aligned permanent teeth  is incorrect because spaced (not tightly aligned) primary teeth are actually a better indicator of sufficient arch space for proper alignment of permanent teeth. B. Disto-occlusion  and  C. Mesio-occlusion  refer to malocclusions (Class II and Class III bi...

 # The palate is considered the most appropriate insertion site for miniscrews supporting an intraoral distalizer because it: a) is free of dental roots and other anatomical structures b) does not create a force vector passing coronally to the maxillary arch’s center of resistance c) takes advantage of bicortical anchorage d) all of the above The correct answer is D.  All of the above Explanation: The palate is an ideal site for miniscrew-supported intraoral distalizers because of the following advantages: Free of dental roots and other anatomical structures (Option a) The mid-palatal region is a safe zone with minimal risk of damaging dental roots or vital structures, making it ideal for miniscrew placement. Does not create a force vector passing coronally to the maxillary arch’s center of resistance (Option b) Placing miniscrews in the palate helps direct force closer to the center of resistance of the maxillary arch , reducing unwanted tipping or extrusion effects. Takes ...

 # Intraoral Class II distalizers have the major disadvantage of: a) the need for patient compliance b) a force vector passing coronally to the maxillary arch’s center of resistance c) anterior anchorage loss d) an inability to be used simultaneously with multibracket appliances The correct answer is: c) Anterior anchorage loss Explanation: Intraoral Class II distalizers, such as the Pendulum appliance, Distal Jet, or Forsus, rely on posterior force application to move the maxillary molars distally. However, a major drawback is anterior anchorage loss, meaning: As the maxillary molars move distally, the anterior teeth tend to drift forward, leading to proclination of the incisors. This can compromise the correction of a Class II malocclusion if not properly controlled with anchorage reinforcement. Why not the other options? (a) The need for patient compliance → Not true for most fixed distalizers (e.g., Pendulum, Distal Jet), but true for removable appliances like elastics or headg...

 # The Invisalign Palatal expander is directly printed from: a) polyamide-12 b) TC-85 c) polymethyl methacrylate d) thermoplastic polyurethane The correct answer is A. Polyamide-12. The Invisalign Palatal Expander (IPE) is 3D-printed directly from Polyamide-12 (PA-12) , a biocompatible and durable nylon-based material. This material is widely used in medical applications due to its strength, flexibility, and resistance to wear. PA-12 allows for precise and customized expansion while maintaining patient comfort.

  # The Invisalign Palatal Expander (IPE) is designed to expand the dentition in increments of: a) 0.1mm b) 0.25mm c) 0.5mm d) 1mm The correct answer is B. 0.25 mm. The Invisalign Palatal Expander (IPE) uses a series of custom-designed, 3D-printed expansion trays to gradually widen the upper arch. It expands the dentition in controlled increments of 0.25mm per adjustment, ensuring a more comfortable and predictable expansion compared to traditional rapid palatal expanders (RPEs).

 # Following are "essential diagnostic criteria" according to Graber except: a) Case history b) Facial photographs c) Periapical x-rays d) Lateral cephalograms The correct answer is: d) Lateral cephalograms Graber's essential diagnostic criteria for orthodontic diagnosis typically include case history, facial photographs, and periapical x-rays. Lateral cephalograms, while useful for orthodontic analysis, are not considered part of the essential diagnostic criteria according to Graber.

 # In a trauma patient with intraoral bleeding, best way to secure airway is: A. Awake blind intubation B. Awake fibreoptic intubation C. Tracheostomy D. Cricothyroidotomy The correct answer is: D. Cricothyroidotomy Explanation: In a trauma patient with intraoral bleeding , maintaining a secure airway is critical because blood in the oral cavity can obstruct visualization and aspiration can compromise the airway. Here's why cricothyroidotomy is the best option in this scenario: Challenges with intubation in intraoral bleeding : Awake blind intubation (Option A) is highly unreliable due to the inability to visualize the airway and the presence of blood. Awake fibreoptic intubation (Option B) may not be feasible in this case because the blood obstructs the fibreoptic scope's view, making the procedure very difficult.  Although performing fiber-optic intubation under local anesthesia for achieving successful endotracheal intubation is one of the recommended methods in situat...