what does the literature say about canal diameters?
DESCRIPTION
What does the literature say about canal diameters?. Median of maxillary canal diameters 1mm from apex Mx. cent. incisor.34mm Lateral incisor.45mm Canine .31mm Premolar .37mm MB1, MB2 (molar).19mm DB.22mm Palatal.33mm. Wu et al 2000. - PowerPoint PPT PresentationTRANSCRIPT
What does the literature say about canal
diameters?
What does the literature say about canal
diameters?Median of maxillary canal diameters
1mm from apex Mx. cent. incisor .34mm Lateral incisor .45mm Canine .31mm Premolar .37mm MB1, MB2 (molar) .19mm DB .22mm Palatal .33mm
Median of maxillary canal diameters 1mm from apex Mx. cent. incisor .34mm Lateral incisor .45mm Canine .31mm Premolar .37mm MB1, MB2 (molar) .19mm DB .22mm Palatal .33mm
Wu et al 2000
What does the literature say about canal
diameters?
What does the literature say about canal
diameters?Median of mandibular canal diameters
1mm from apex Md. central incisor .37mm Lateral incisor .37mm Canine .31mm Premolar .35mm MB (molar) .40mm ML .38mm Distal .46mm
Median of mandibular canal diameters 1mm from apex Md. central incisor .37mm Lateral incisor .37mm Canine .31mm Premolar .35mm MB (molar) .40mm ML .38mm Distal .46mm
Wu et al 2000
Radiographic terminus alters throughout life – cellular cementum deposition
Radiographic terminus alters throughout life – cellular cementum deposition
Apical foramenApical foramen
Radiographic Terminus – NOT!!Radiographic Terminus – NOT!!
Electric Foramenal LocatorsElectric Foramenal Locators
In 1962 Sunada determined that the resistance between oral mucosa and periodontal ligament is a constant value 6.5 ohms (40/μAmp)
In 1962 Sunada determined that the resistance between oral mucosa and periodontal ligament is a constant value 6.5 ohms (40/μAmp)
must turn unit on before attaching
probe to unit…
“might think in previous tooth” canals can be wet, but chamber must
be dry…
no shared fluid between canals instrument must be free in access
opening…
no contact with metal
must turn unit on before attaching
probe to unit…
“might think in previous tooth” canals can be wet, but chamber must
be dry…
no shared fluid between canals instrument must be free in access
opening…
no contact with metal
EAL = 0.0EAL = 0.0
Anatomic apexAnatomic apex
PDL,cementum & bone
PDL,cementum & bone
Bleeding pointBleeding point
**
Working LengthWorking Length
generic knowledge of root lengths measure radiograph –
advantage of digital images foramenal locators
USED REPEATEDLY final WL determined after coronal
debridement – lengths change with shaping
generic knowledge of root lengths measure radiograph –
advantage of digital images foramenal locators
USED REPEATEDLY final WL determined after coronal
debridement – lengths change with shaping
foramenal locators foramenal locators USED REPEATEDLYUSED REPEATEDLY