Dentosphere : World of Dentistry

 # Resistance of mini screw to dislodgement comes from contact with: A. Soft tissue B. Teeth C. Medullary bone D. Cortical bone The correct answer is D. Cortical bone. The quality and quantity of the alveolar bone are considered important influential factors affecting the success rate of orthodontic mini-implants. The cortical bone thickness is considered a decisive factor in the overall success/failure of the mini-implant. It has been shown that an increase in the cortical bone thickness in the alveolar bone of maxilla and mandible significantly increases the primary stability of the mini-implant. A recent meta-analysis showed positive association between mini-implant stability and amount of cortical bone.  Reference: Temporary Anchorage Devices in Orthodontics, SECOND EDITION, Ravindra Nanda, BDS, MDS, PhD

Introduction Gingival stippling is a term commonly used in dentistry to describe the texture or appearance of the gums. These stippled gums can tell dental professionals a lot about a person's oral health. While it might not be a topic of everyday conversation, understanding gingival stippling is crucial for both dental practitioners and patients. In this article, we will explore what gingival stippling is, its significance, and how it relates to oral health. What is Gingival Stippling? Gingival stippling refers to the small, dimpled, or pebbled texture that is often seen on the surface of healthy gums. This stippled appearance is caused by the presence of tiny, raised dots or projections on the gingival tissue, creating a finely textured, orange-peel-like appearance. Gingival stippling is most commonly found on the gums that surround the teeth in the upper and lower arches of the mouth. Significance of Gingival Stippling: Indication of Gingival Health: Gingival stippling is primar...

 # The movement of bone in response to its own growth is termed as: A. Rotation B. Primary displacement C. Secondary displacement D. Differentiation The correct answer is B. Primary displacement. Displacement is described as the change in position of an object following the application of force. In this chapter, the term will be used for body tissues (namely, bone), and force is the growth of body tissues. The displacement of bones occurs with growth in two ways: 1. Primary displacement of a bone occurs due to its growth, which causes it to move from its original position. For example displacement of the chin anteriorly due to the increasing mandibular length. 2. Secondary displacement (also called translatory growth) is an illustration of growth at a location subsequent to actual growth occurring in a distant part of the skeletal system. The structure in question is displaced from its position due to- the growth of adjacent structures. For example, growth of the spheno-occipital s...

 # Next to third molars, the most frequently impacted teeth are the:  a) second molars  b) upper canines  c) lower canines  d) upper incisors The correct answer is B. Upper canines.  The most commonly impacted teeth are third molars, followed by the maxillary canines and mandibular second molars.  Reference: Graber 7th Edition

 # Miniscrew-assisted rapid palatal expansion (MARPE) is used primarily in:  a) young children  b) the mixed dentition  c) older adolescents and adults  d) adults who cannot tolerate other devices The correct answer is C. Older adolescents and adults. In late adolescents and adults, more force is required to open the midpalatal suture due to its increased interdigitation. Treatment with a conventional RPE (Rapid Palatal Expansion) could lead to unwanted dental side effects. Therefore, from the age of 16 onwards, surgically-assisted RPE (SARPE) is commonly applied to overcome these limitations by surgically releasing the interdigitated suture prior to maxillary expansion with an RPE (Rapid Palatal Expansion) device, such as a hyrax or a Trans-Palatal Distractor (TPD). However, the inherent risks of a surgical operation, together with the cost, the hospitalization, and attendant morbidity may pose a constraint for patients to undergo this procedure. The ensuing qu...

The United Arab Emirates (UAE) is renowned for its commitment to excellence in all sectors, including healthcare. When it comes to dental care, the UAE is home to a multitude of registered dental clinics that adhere to stringent quality standards. In this article, we will explore the significance of registered dental clinics in the UAE, their role in providing top-notch oral healthcare, and how they contribute to the nation's overall well-being. The Importance of Registration Dental clinics in the UAE must undergo a rigorous registration and accreditation process to operate legally. This process is overseen by various regulatory bodies, including the UAE Ministry of Health and Prevention (MOHAP) and the respective health authorities of each emirate. The registration of dental clinics serves several crucial purposes: Ensuring Compliance: Registered clinics are required to comply with strict regulations related to hygiene, equipment, and the qualifications of their dental staff. This...

 # Succinylcholine prevents bronchospasm by: A. Depolarising block B. Direct muscle relaxation C. Centrally acting muscle relaxation D. Dual action The correct answer is A. Depolarising block. A depolarizing neuromuscular blocking agent, succinylcholine adheres to post-synaptic cholinergic receptors of the motor endplate, inducing continuous disruption that results in transient fasciculations or involuntary muscle contractions and subsequent skeletal muscle paralysis. Following pharmacological onset, further neuromuscular transmittance across the neuromuscular junction is interrupted, given the medication dosage is sufficient and remains bound to the cholinergic receptor sites of the motor endplate. Depolarization of the postjunctional membrane deactivates sodium avenues resulting in inhibited responses to acetylcholine normally released. The mechanism of action is apparent within 60 seconds of intravenous administration and continues up to 360 seconds or 6 minutes.

 # Tic douloureux is synonymous with: A. Trigeminal neuralgia B. Temporal lobe epilepsy C. Glossopharyngeal neuralgia D. Todds paralysis The correct answer is A. Trigeminal neuralgia. Trigeminal neuralgia (TN or TGN), also called Fothergill disease, tic douloureux, or trifacial neuralgia is a long-term pain disorder that affects the trigeminal nerve, the nerve responsible for sensation in the face and motor functions such as biting and chewing. It is a form of neuropathic pain. There are two main types: typical and atypical trigeminal neuralgia. The typical form results in episodes of severe, sudden, shock-like pain in one side of the face that lasts for seconds to a few minutes. Groups of these episodes can occur over a few hours. The atypical form results in a constant burning pain that is less severe. Episodes may be triggered by any touch to the face. Both forms may occur in the same person. It is regarded as one of the most painful disorders known to medicine and often results...

 # First to classify malocclusion on structural basis: A. Salzmann B. Kingsley C. Angle D. Katz The correct answer is A. Salzmann. Salzmann in 1950 was the first to classify malocclusion based on skeletal structures.  • Skeletal Class I: These are purely dental malocclusions. The jaws are in harmony with one another. The profile is orthognathic.  • Skeletal Class II: Subnormal and distal mandibular development in relation to maxilla  • Skeletal Class III: Overgrowth of the mandible with a prognathic mandible. 

 # Indications of Hydroxyapatite coated implants over titanium or metal-surfaced implants include all of the following except? A. The need for greater bone-implant interface contact area B. The ability to place the implant in type I bone C. Fresh extraction sites D. Newly grafted sites The correct answer is B. The ability to place the implant in type I bone.  Indications of HA-coated implants over titanium- or metal-surfaced implants include:  • Need of more contact area at bone-implant interface  • Implant can be given in type IV bone  • Implant can be given at fresh extraction sites  • Implant can be given at newly grafted sites