Eruption-1

No.	Question	Answer
1	What is eruption?	The movement of the tooth from its place of formation to its place of function in oral cavity
2	Physiologic tooth movement includes	Pre eruptive tooth movement; Post eruptive tooth movement; Eruptive tooth movement. But not circumeruptive movements
3	The initial crowding in developing teeth in infant jaw’s anterior segment is relieved by the	Growth in length of jaws
4	The permanent incisors tooth germ first develop _______ to the deciduous tooth germ	Lingual
5	The permanent incisor and deciduous tooth germ develop in a	Same bony crypt
6	The permanent incisor tooth germ get their own bony crypt	When their predecessor deciduous teeth erupt
7	Permanent premolar begin their development	Lingual to deciduous molar
8	The upper permanent molars develop in the maxillary tuberosity initially have their occlusal surfaces facing	Distally
9	The mandibular permanent molars develop with their occlusal surfaces inclined	Mesially
10	The principal direction of tooth movement in eruptive phase are	Occlusal or axial
11	The principle post eruptive movement (s) that maintain the position of erupted teeth with growing jaws is	Axial
12	The tooth movement that compensates for occlusal & proximal wear?	Post eruptive tooth movement
13	The principle post eruptive movement (s) that compensates for occlusal & proximal wear is (are)	Axial and mesial migration
14	The positioning of the developing tooth germ is achieved in pre-eruptive phase is  by	Bodily movement and eccentric growth
15	The periodontal ligament formation is coincident with the onset of	Eruptive tooth movement
16	The histological entities in periodontal ligament that accounts for eruptive movements?	Zona adherens between fibroblasts; Rapid remodeling of fibers; Presence of fibronexus
17	What is Fibronexus	The morphological relationship between microfilaments of fibroblasts, cell membrane, extracellular filaments and fibronectin.
18	The dentogingival junction is formed during the	Eruptive tooth movement
19	The reason (s) for absence of hemorrhage during eruption of teeth is that	Reduced enamel epithelium and oral epithelium fuse and degenerate; Epithelium is avascular ; Loss of intervening connective tissue between reduced enamel and oral epithelium
20	Rapid eruptive movement is observed till the tooth	Reaches occlusal plane and meets its antagonist
21	The small connective tissue filled canal lying apical to the successional tooth germs is referred to as	Gubernacular canal
22	The gubernacular cord contains remnants of	Dental lamina
23	The tooth makes movements primarily to accommodate the growth of the jaws in	Post eruptive tooth movement
24	Post eruptive tooth movement occurs most actively between the ages of	14- 18 years
25	Post eruptive tooth movement is associated with	Condylar growth
26	What does bone remodeling theory of tooth eruption?	The theory that states that the selective deposition and Resorption of bone brings eruption is the
27	What is root growth theory?	The theory that proposes that proliferating root impinges on a fixed case thus converting the apically directed force into occlusal movement.
28	The theory that supposes that the cells and fibers of ligament pull teeth in to occlusion is	Ligament traction theory
29	Cushion hammock ligament is associated with	Root growth theory
30	Axial tooth movement during compensation of occlusal wear does not require	Bone remodeling
31	When the jaws are clenched bringing teeth into contact, force is generated in a	Mesial direction
32	The mesial drift of teeth is achieved by the	Contraction of the transeptal fibers
33	Minor progressive occlusal wear can be treated by proper	Selective grinding
34	The deciduous maxillary canine erupts by	18 months of age
35	The deciduous mandibular lateral incisor erupts by	7 months of age
36	Permanent maxillary canine erupt by	11 -12 years
37	Permanent maxillary second premolar erupts by	10-12 years
38	Permanent mandibular second premolar erupts by	11 -12 years
39	Which phase of tooth movement has an intraosseous & extraosseous component?	Eruptive tooth movement
40	The periodontal ligament develops only after	Root formation has been initiated
41	The property of contractility  is especially well developed in	Periodontal ligament fibroblasts
42	The rate of eruption of a tooth during the intraosseous phase averages	1to 10 micrometers/ day. In the extraosseous phase rate of eruption is estimated to be 75 micrometer per day.
43	A sustained muscular force sufficient to move a tooth is	4-5 gram
44	What structure(s) is (are) necessary to permit the bone remodeling that occurs with tooth movement	Dental follicle