Anatomy of pulp cavity

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Across
  1. 5. access cavity shape in mandibular 1st molar with 4 canals
Down
  1. 1. longest root canal of maxillar 1st molars is
  2. 2. apical constriction is known as
  3. 3. the 4th root if present in max.1st molar is
  4. 4. cervical cross section of maxillary first premolar is in which shape