IN THE NAME OF GOD - PowerPoint Presentation

Slide1

IN THE NAME OF GOD

Dr:Nahvi

Force eruptionSlide2

Force eruption

Unerupted

tooth

Fractured toothSlide3

Tooth eruption

A permanent tooth should erupt:6 months after natural exfoliation of its predecessor

Eruption delayed :

if the interval extends to more than 1 year. Slide4

Eruption of a tooth is considered to be delayed :

The normal time for eruption has been exceeded.

The tooth is not present in the dental arch and shows no potential for eruption. The root of the

unerupted

tooth is completely formed.

The homologous tooth has been erupted for at least 6 months.

J Can Dent Assoc 2010 Slide5

Most commonly become impacted

third molarsmaxillary canines

maxillary central incisorsmandibular second premolarsSlide6

Causes of Delayed Eruption

Localized

GeneralizedSlide7

Localized

the presence of supernumerary teeth

(most common )Odontoma

dilaceration

malpositioning

of the tooth germ

Crowding

calcifying

odontogenic

cyst

trauma to the corresponding deciduous toothSlide8

systemic conditions

cleidocranial

dysostosis hypothyroidism

Gardner syndrome

Down syndromeSlide9

Criteria for Treatment

chief complaint

At least 3 mm of bone

The tooth is mature

J Can Dent Assoc 2010;76:a147 Slide10

Alignment of an impacted tooth

position and direction

degree of root completion

degree of dilacerations

presence of spaceSlide11

Treatment planning

:

1-surgical exposure

2-Attachment to the tooth

3-Orthodontic mechanicsSlide12

surgical exposure

(1) exposure of the entire labial aspect (the window approach)

(2) a technique which exposes only 4–5 mm of the labial aspectSlide13

Attachment

Gold chainBand

Cast gold crown,onlayThreated

pin

Wire loop

Direct bond attachment(the best)Slide14

General characteristics of orthodontic Forces

Optimal:light,continuous

-Ideal material

Maintains elasticity

Maintains force over a range of tooth movementSlide15

Force

Continuous

InterruptedIntermittent

Extrusion 35-60grSlide16

ContinuousSlide17

InterruptedSlide18

IntermittentSlide19

Contemporary orthodonticsSlide20

Direction

of force

parallel to the long

axis

avoid

torquing

forces

Oral Maxillofacial Surg Clin N Am 16 (2004) 75-89Slide21

Force eruption

Fixed appliancesRemovable appliancesSlide22

Fixed appliances

Do not require special patient cooperation

precise coronal and root movementsRemovable appliances

less

chairtime

better oral hygiene

More estheticSlide23

Removable appliances

retention claspslabial bow

Hook(for attachment of elastics)Finger spring,Zspring,Canine

retractorSlide24

Removable appliances

at least

10 hours per

day.

Rest

intervals,not

to exceed five hours per

day.

wear

the

appliance

24

hours a day, removing it

only for

mealsSlide25

the

elastics should be changed every two or

three days.Lingual tipping will be

minimized when

the labial bow is used

for the

extrusive force

JCO/JULY 2002Slide26
Slide27

Fixed appliances

coil :

maintains the space

anchorage and balancing resistance

J Can Dent Assoc 2010Slide28

Anchorage support for the extrusion—a minimum of one tooth on either side of a single-rooted tooth (2 anchors)

or

two teeth on either side of a multi-rooted tooth (4 anchors)

Use a heavy square or rectangular

NiTi

wire to minimize tippingSlide29

J Can Dent Assoc 2010;76:a147 Slide30

Magnetic force

For a patient with other missing teeth

Contemporary orthodonticsSlide31

Elastics

-light-medium(1/8 =3.18mm 127.58gr)

-heavy

Orthodontic Elastics (3/8", 5/16", 1/4", 3/16", 1/8")

Shiraz

Univ

Dent J 2009; 10(1):7-15Slide32

clinical problems (canine)

1) Lateral root

resorption2) External cervical

resorption

3)

Dentoalveolar

ankylosis

4)

Calcific

metamorphosis of the pulp

and aseptic pulp necrosis

.

Dental Press J

Orthod

. 2010 Nov-Dec;15(6):18-24Slide33
Slide34

Thank You