Dental Past Paper PDF

**596. Gumma:** - **Central necrosis granuloma (histology)** **597. Anxious patient with peptic ulcer:** - **a. Diazepam** **598. Blood alkalosis (signs):** - **Twitching of facial muscles** **599. The most common pin used in restorative procedures:** - **d. Self-threaded pin or cemen...

**596. Gumma:** - **Central necrosis granuloma (histology)** **597. Anxious patient with peptic ulcer:** - **a. Diazepam** **598. Blood alkalosis (signs):** - **Twitching of facial muscles** **599. The most common pin used in restorative procedures:** - **d. Self-threaded pin or cemented** **600. Tongue blade appliance used to correct:** - **a. Thumb/finger sucking or anterior crossbite**\ Tongue blade appliances are used for habit correction like thumb or finger sucking. **601. Most common complication of lower molar extraction: dry socket** **602. Complication of impaction surgery** - **d. All** (Swelling, Hemorrhage, Dry socket) **603. Discoloration and loss of translucency of tooth** - **a. Pulp death** **604. Suitable height of abutment** - **a. Allow good clearance with opposite arch** **605. Space maintainer Mandibular molar teeth loss** - **a. Passive lingual arch** **606. 1st formed dentine** - **a. Mantle dentine** **607. Swelling, diffuse, radiopaque angle mandi** - **a. Cementoblastoma** **608. Periauricular access to TMJ mobility may result from injury** - **a. Auriculotemporal nerve** **609. Nursing bottle caries 1st affect** - **a. Maxillary incisors** **610. Which makes chemical bond with tooth structure** - **a. Zinc polycarboxylate** **611. Direct retention most needed in RPD** - **a. Class 1** **612. Lingual bar in RPD** - **a. 3mm away from gingival margin** **613. Most popular type of pins** - **a. Self-threaded** **614. Light ortho force effects** - **b. Metabolic changes in PDL** **615. X-ray in pre-implant placement periapical** - **c. OPG** (Orthopantomogram) **616. Pt with maxillofacial trauma. What position to transfer the patient to hospital for treatment?** - **b. Supine** **617. For making crown bur used** - **a. Tapered fissured** **618. For border molding distolingual border of tongue** (No direct answer given in the list) **619. Early plaque bacteria** - **a. Gram +ve aerobic cocci** **620. Sandwich technique: what liner used under composite** - **b. GIC** (Glass Ionomer Cement) **621. Secondary dentine formed due to** - **d. All** (Recurrent caries, Trauma, Attrition wear) **622. Lateral cephalogram shows what?** (No direct answer provided) **623. GIC set by** - **a. Acid-base reaction** **624. Pin used in amalgam for** - **a. Retention of amalgam** **625. Main complication with FPD** - **a. PDL problem** **626. Interdental floss**\ a. Remove plaque **627. Most biocompatible material in oral cavity**\ b. Titanium **628. Function of enamel bevel**\ b. Expose enamel prism Strengthen the restoration **629. Radiolucency associated with developing 3rd molar**\ c. Dentigerous cyst **630. Excessive cementum formation root apex**\ a. Hypercementosis **631. Which irrigation needle is used in endo irrigation**\ Answer: Use of side-vented irrigation needles is recommended for safe and effective endodontic irrigation. **632. If perforation occurs while placing pin. Management?**\ Answer: If perforation occurs, options include sealing the perforation with a material like MTA or other repair materials. **633. Etiology of periapical abscess**\ Answer: Bacterial infection, usually stemming from pulpal necrosis or dental caries. **634. C factor**\ a. Configuration factor (C factor) = Bonded surfaces / Unbonded surfaces - Class 1: 5/1 = 5 - Class 2: 4/2 = 2 - Class 3: 4/2 = 2 - Class 5: 5/1 = 5 **635. Polymerization shrinkage in composite after how many days?**\ Answer: Typically 2-4 days **636. Transfer of trauma patient in which position**\ Answer: Depends on the injury but generally, if suspected spinal injury, supine position with spinal precautions. **637. Patient develops swelling during surgery which crackles on sound due to**\ Answer: Subcutaneous emphysema **638. Hematoma is common with which nerve block?**\ Answer: PSA (Posterior Superior Alveolar) nerve block **639. Trismus is due to which muscle?**\ Answer: Medial pterygoid **640. Sulphur granules seen in**\ Answer: Actinomycosis **641. Desquamative gingivitis/gingivosis**\ Answer: Conditions such as lichen planus or pemphigoid can cause desquamative gingivitis. **642. Strawberry gingivitis**\ Answer: Wegener\'s granulomatosis **643. Primary colonizer of plaque**\ Answer: Gram-positive facultative anaerobic cocci, such as *Streptococcus sanguis* and *Actinomyces viscosus*. **644. 2 years after crown placement, inflammation due to?**\ Answer: May be caused by periodontal disease, poor margins, or allergic reactions to materials. **645. Grade 2 mobility recession 7mm. Treatment?**\ Answer: Scaling and root planing, followed by possible surgical intervention like a graft. **646. DOC for Penicillin allergy**\ Answer: Clindamycin **647. Trismus after IANB (Inferior Alveolar Nerve Block) -- after 2 days, due to muscle spasm**\ Answer: Medial pterygoid muscle spasm **648. Location of mandibular foramen in children**\ Answer: Slightly lower and more anterior compared to adults. **649. Diamond bur is more suitable than carbide bur for?**\ Answer: Diamond burs are more suitable for smoother cutting and finishing on enamel and brittle materials. **650. Most frequent cause of vertical root fracture**\ Answer: Excessive force during obturation or post placement **651. H pattern of occlusion seen in which primary tooth?**\ Answer: Primary maxillary first molar **652. Food accumulation in the vestibule due to which muscle defect?**\ Answer: Buccinator muscle defect **653. Why ridge lap is better than modified ridge lap?**\ Answer: Ridge lap design provides better esthetics and tissue adaptation. **654. Sterilization** - Dry heat: Kills by oxidative damage and protein denaturation. - Moist heat: Kills by protein coagulation. - Dry heat: Test organism - *Clostridium tetani*. - Moist heat: Test organism - *Bacillus stearothermophilus*. **655. Advantage and disadvantage of full thickness and partial thickness flaps**\ Answer: Full thickness flaps provide better access, while partial thickness flaps preserve periosteal blood supply. **656. Spread of odontogenic infection depends on?**\ Answer: The anatomy of the area, muscle attachments, and fascial spaces. **657. Function of bevel**\ Answer: Beveling increases restoration strength and reduces stress concentration. **658. Purpose of acid etching**\ Answer: Creates microtags in enamel for resin bonding. **659. Treatment of ranula and mucocele**\ Answer: Excision of the lesion and the gland if necessary. **660. Mouth breathing**\ Answer: Often associated with gingival inflammation and increased caries risk. **661. Uses of MTA (Mineral Trioxide Aggregate)** - Apexification - Root end filling - Perforation repair - Root resorption repair **662. GTR (Guided Tissue Regeneration) should not be used for?**\ Answer: Not suitable for cases with insufficient bone support or poor patient compliance. **663. 10-year-old child lost primary mandibular 1st molar -- no treatment**\ Answer: Often, no treatment is needed if the successor permanent tooth is erupting. **664. Cause of failure of amalgam restoration**\ Answer: Marginal breakdown, recurrent caries, or improper cavity preparation. **665. Cause of failure of Class 2 restoration**\ Answer: Inadequate depth **666. Moisture contamination during condensing amalgam**\ Answer: Delayed expansion **667. Difference between abscess and periapical abscess**\ Answer: Vitality (periapical abscess typically involves a non-vital tooth) **668. Submandibular gland palpation**\ Answer: Best done with bimanual simultaneous intraoral and extraoral palpation **669. Predominant organism in abscess**\ Answer: Predominantly *Streptococcus* species in early stages, followed by anaerobic bacteria such as *Fusobacterium* and *Porphyromonas*. **670. In CD, if maxillary posterior border is thick, when wide open denture dislodges due to denture hitting**\ Answer: Coronoid process **671. Inorganic substance for subgingival calculus derived from**\ Answer: GCF (Gingival Crevicular Fluid) **672. ANUG diagnosis**\ Answer: - *Clinically*: Punched-out, crater-like depressions at the crest of interdental papillae covered by pseudomembrane. - *Microscopically*: Presence of spirochetes (*Borrelia vincenti*) and fusiform bacilli (*Fusobacterium*). - *Treatment*: 3% H2O2 with water dilution and antibiotics such as penicillin + metronidazole. **673. The maximum acceptable dose of adrenaline in cardiac patients**\ Answer: 0.04 mg (equivalent to 2 cartridges) **674. Trismus associated with which space involvement**\ Answer: Involvement of the pterygomandibular space or medial pterygoid muscle. **675. Dry socket**\ Answer: - Symptoms: Dull pain with minimal swelling, typically starting 3 days after extraction. - Most common in mandibular molar areas. - Organism: *Treponema denticola*. - Treatment: Irrigation and sedative dressing. **676. Direction of healing for mandibular extraction site**\ Answer: Healing occurs from the bottom (apical) to the top (coronal). **677. Which tooth has bifurcated canal or root**\ Answer: Mandibular first premolar or mandibular molars (especially first molar). **678. Which tooth is wider mesiodistally than cervicoincisally**\ Answer: Maxillary central incisor **679. A patient with lower complete denture complains of pain in the region of the mental foramen. The most common cause is**\ Answer: a. Schwannoma **680. If you want to make a Class V in lower canine and you want to fix a rubber dam, what precaution will you take with fixing of rubber dam?**\ Answer: b. Punch the hole more lingually (to avoid the gingival clamp damaging the facial tissue) **681. A patient complains of numbness to the lower lip; what's the cause?**\ Answer: Both a. Fracture in the premolar region and b. Malignant tumor (as both can cause numbness) **682. Gonion, pogonion, menton are parts of which bone?**\ Answer: c. Mandible **683. A patient receives a blow to his chin, and he develops deviation of the mandible to the right side; what's the possible diagnosis?**\ Answer: b. Fracture of the right condyle (this would cause deviation to the opposite side) **684. A patient receives a blow to his eye; what's the most common to happen?**\ Answer: c. Pain and sensitivity to touch due to pain in cheek and lip. **685. 4 carpules of 2% lidocaine solution with 1:100,000 epinephrine contains how many mg of lidocaine and epinephrine?**\ Answer: a. 80 mg of lidocaine and 0.04 mg of epinephrine.\ **686. A 14-year-old child presents to the dental office with pain in the lower molar, premolar region with vital teeth; radiographically it appears as a radiolucent lesion below the roots of the teeth, and when opened the area found no fluid; what's the possible diagnosis?**\ Answer: a. Static bone cyst **687. A mouth breathing patient would probably have which type of occlusion?**\ Answer: B. Class II **688. A child in mixed dentition stage with bilateral missing primary teeth needs which type of space maintainer?**\ Answer: b. Band and loop (appropriate for bilateral loss of primary molars) **689. A child with protruded upper incisors; when is the best time to make for him a high labial arch removable appliance?**\ Answer: a. After shedding of deciduous canines (this allows for better arch development) **690. A child receives trauma to his lower four incisors and leaves them for four years; now he develops pain and swelling; radiographs show radiolucency below the four incisors; what should be done?**\ Answer: a. Vitality test to the teeth and RCT to be done on the non-vital teeth. **691. A 40-year-old woman has a swelling in the upper right first molar region; radiograph shows periapical abscess and non-vital pulp; what should be done to her?**\ Answer: c. Make an access, give antibiotics, and leave the tooth opened for 72 hours. **692. When doing RCT for a lower central incisor and you find an extra canal, where is it most probably to be?**\ Answer: a. Lingual **693. The best technique to make a flap for surgical removal of a periodontal pocket?**\ Answer: c. Modified Widman flap **694. Which is the most responsive to bone grafts?**\ Answer: a. Grade 1 osseous defects (less complicated defects respond better to grafts) **695. What is bone swagging?**\ Answer: a. Repositioning the bone graft to an adjacent defect **696. How to differentiate between apical and periodontal abscess?**\ Answer: b. Vitality test **697. What tool is used for root planing of a pocket with a depth of more than 5mm?**\ Answer: d. Ultrasonic scaler (more effective in deeper pockets) **698. What's the best tool to remove subgingival calculus below 5mm depth?**\ Answer: a. Curette **699. Vertical fracture of RCT treated tooth is mainly due to?**\ Answer: a. Lateral condensation of gutta-percha **700. Which of the following affects the efficiency of irrigation?**\ Answer: a. Sufficient widening of access cavity (allows better flow and access to canals) **701. A lateral canal found in the middle third of a lower premolar; after obturation, the lateral canal appears not filled with the material and shows a small radiolucency around it radiographically; what should be done?**\ Answer: c. Remove gutta-percha and re-obturate so that the material can enter the canal. **702. A deep cavity in a primary tooth exposing the pulp; what would you do?**\ Answer: a. Pulpectomy and formocresol (for primary teeth, pulpectomy is preferred over RCT) **703. A carbide bur with a greater number of cutting blades causes?**\ Answer: a. Smooth surface with faster cutting **704. Which is harder?**\ Answer: c. Type IV gold (known for its strength and hardness) **705. Isthmus fracture is caused by**\ Answer: a. Inadequate width and depth of the isthmus area **706. Rounding or beveling of the axiopulpal line angle causes?**\ Answer: a. Stress distribution among dentin (reducing stress concentration) **707. Composite problem in finishing is due to the dislodgement of filler from matrix due to?**\ Answer: b. Hard filler, soft matrix **708. Tin in amalgam does?**\ Answer: a. Decrease tarnish **709. After placing GI cement, a layer is painted over it; why?**\ Answer: a. To decrease moisture contamination **710. Which makes a chemical bond?**\ Answer: c. Zinc polycarboxylate (forms a chemical bond to tooth structure) **711. Ovate pontic is?**\ Answer: a. The most hygienic **712. A margin of a PFM crown in a lower molar is usually placed subgingival in cases of?**\ Answer: a. Esthetics **713. When preparing a tooth for a cast metal crown, what's the most important advantage of making the buccal bevel?**\ Answer: a. So that the metal doesn't get perforated during polishing or during future use. **714. On eating, while teeth are grinding on the functional side, what cusps are in contact on the balancing side?**\ Answer: a. Buccal cusps of the lower molar. **715. Which is the most important reduction surface in an abutment prepared for a PFM crown?**\ Answer: b. Facial **716. Delta hepatitis virus?**\ Answer: c. Affects HBV pts (it requires the presence of Hepatitis B virus to replicate) **717. Hepatitis A virus; which is false?**\ Answer: b. Stays latent in 1/3 of these cases (Hepatitis A does not typically stay latent)