Orthograde root canal (normal) Flashcards
What is at the end of the root
Apical delta
5-20 foramina
What angle are dentin tubules to pulp
90 degrees
Contents of pulp
soft tissue connective tissue: odontoblasts, vascular, lymphatic and nervous tissues as well as odontoblasts, fibroblasts, fibrocytes, collagen fibers, elastic fibers, blood vessels and lymph and nerves
Inflammation of the pulp
Pulpitis
Used to remove pulp at 180 degree turn
Barbed broach
Difference between k files and H files
K-Type, K-File
Twisted three or four sided tapered pyramid
K-files are more flexible then K-Reamers
Hedstrom files ( H Files)
Machine cute from a round metal blank or wire. Spiral groove on a tapered pointed instrument
Best in a push- pull technique, can engage into the dentin with a turn and pull technique
Taper of endo instruments
0.02mm
Forms of gutta percha
Crystalline Beta form is more rigid–stable at room temp, less flowable when heated
with heating it transforms to the Alpha form – brittle at room temp, flowable when heated
Step back technique
Beginning with the smallest file just shy of apex and moving back while increasing file size
WL determined first
Crown down technique
Beginning with the larger file to remove coronal debris and moving small as the file moves closer to apex
Color order
White 15, yellow 20, blue 25, green 30, black 35
Gates glidden
Used to enlarge coronal access
Peeso reamer
Coronal flaring
Bleach
NaOCL
Full stregnth between 5-6%
Most commonly used - antibacterial capacity and the ability to dissolve necrotic tissues
Strong base (pH 11), saponification occurs in organic materials, more effective at higher temperatures
Rarely allergic reaction, does react with chlorhexidines solution - creates a parachloroaniline - may be toxic
Chlorhexadine
Used for general disinfection purposes and treatment of skin, eye and throat infections
pH between 5.5-7
Cationic nature - can stay in the dentin after rinsing the canal , gives a slow release potential
Does damage fibroblasts- cautious use in repeated areas
CHX with NaOCL precipitates and has a color change - worse at 2%
CHX with EDTA has a white precipitate - creates a salt - not chemical rxn
EDTA
Ethylenediaminetetraacetic Acid (EDTA) usually 17%
Chelate and remove the mineralized portion of the smear layer
RC prep
EDTA and urea peroxidase
What are the 4 classes (starting at 0) of Endo-perio lesions
0- Primary endo
1- Endo-perio
2- Perio-endo
3 - True combination
What are the four classes of ISO instruments
1- Hand files, pluggers, spreaders, broaches
2- 2 part. engine. driven = lentulo and mcspadden
3- 1 part engine = gates. glidden, peeso
4- filling points and paper. points
2 types of gutta percha
1 - standard = correspond. to the size of of endo instuments
2- conventional = similar to endo spreaders.
Types of sealers
Zinc oxide eugenol, Calcium hydroxide, non eugenol. (ZO, barium, bismuth), Glass ionomer, Resin (epoxy AH or Methacrylate endorez), silacone. (Guttaflow), Silicate (MTA)
At D16 what is the size of taper
36mm (16x.02)
MTAD
Doxy, citric acid, detergent
Near pulp exposure
.5mm of dentin left
Tublules per mm
wiggs = 30-40000
Niemiec = 30-96000
1mm = 52000
Bacteria of intact vs fractured teeth
In intact teeth, >90% of bacteria are obligate anaerobes, while teeth with pulp exposure harbor a population of almost 70% obligate anaerobes within their apical third.
Hayflick limit
Somatic cells have a limited life span and capability for division,
Relationship between luxation and pulp survival
concussion<sublux<Ext<LatLux<Int<Av
Can someone explain life in alaska
**Another paper switches lateral lux and EXT
Storage of luxated teeth
Tap water – bad (hypotonic, rapid cell lysis)
Hank’s balanced salt solution (HBSS), Save-a-Tooth – both effective
saliva
Low-fat milk also excellent for up to 6 hrs, esp if kept chilled (4⁰C)
If milk used for >15 min, soak in HBBS for 30 min before replantation
Time to reimplant avulsed tooth
60 min if dry and if solution immature teeth can be up to 3 hours
Apexification vs Apexogenesis.
Apexification - calcium barrier in a nonvital tooth
Apexogenesis - trying to maintain or stimulate vital tissue to maintain dvpt
