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Few MCQ On Dental Anatomy And Histology
1. Which of the following is a widely accepted theory of eruption?
- Root formation theory
- Bone-remodelling theory
- Vascular pressure theory
- Ligament traction theory
ANSWER d
- It is said to be the most accepted theory.
- This theory states that periodontal ligament are rich in fibroblast which contain contractile elements.
- This fibroblasts contracts and transmit the forces to collagen bundle fibres of PDL which leads to application of axially directed force which causes eruption of tooth.
2. The cell which resorbs dentin is
- Fibroblast
- Ameloblast
- Odontoclast
- Osteoclast
ANSWER c
Odontoclasts
Three dental hard tissues, i.e., cementum, dentin, and enamel, are resorbed by multinucleated cells referred to as "odontoclasts." These cells have morphological and functional characteristics similar to those of boneresorbing osteoclasts.
3. Fibronexus is seen in the
- Periodontal ligament
- Alveolar bone
- Pulp
- Gingiva
ANSWER a
The fibronexus is a cell surface specialization consisting of intracellular actin filaments and extracellular fibronectin filaments associated with subplasmalemmal plaque material.
The fibronexus, by mediating cell-to-cell and cell-to-matrix attachments, may serve to transmit contractile forces generated by actin microfilaments in these cells throughout the diseased tissue.
4. The most commonly retained primary tooth is the
- Maxillary lateral incisor
- Maxillary second molar
- Mandibular central incisor
- Mandibular canine
The most common primary teeth that become over-retained are the maxillary (upper) second molars and the maxillary canines.
5. The first tooth which erupts into the oral cavity is the
- Mandibular first molar
- Maxillary first molar
- Primary mandibular central incisor
- Primary mandibular canine
