1. LA Flashcards
(25 cards)
Cartridges for LA contains ____mL of LA agents.
1.8-2.2 mL
27 Gauge is _____(larger/smaller) than 30 Gauge
Larger
What technique do we use when assembling LA cartridge?
Aseptic techinique
Syringe is not reusable. True or False?
False
Define infiltration
- Depositing LA solution close to the tissues to be anaesthestised - The solution diffuses around the fine branches of the sensory nerves in that area
Define infiltration
- Zone of anaesthesia is limited to the structures innervated by those nerves - Good success so long as no barriers to diffusion - Barriers: thick cortical bones, facias etc.
Define regional nerve block
- Deposit LA solution around a main trunk of sensory nerve - Blocks all branches of the nerve -Wider fild of anaesthesia than infiltration technique
General tips of applying LA
- Use topical (wait for it to work) - Don’t wave needle in front of patient - Hold mucosa taut at injection site - Pressure on palate before palatal injection - Inject slowly - LA temperature close to body temperature (or room temp.) - Place small amount of LA first to numb the region before injecting the bulk - Aspirate to check for vascularity (DONT inject intravascular) - Do Not inject subperiosteally
_____(short/long) needle is needed for maxilla infiltration
Short
Needle should aim for _______ during maxilla infiltration
Apex of tooth
Extraction and Scaling of the maxilla region, LA should be placed at the ______ region
Palatal. Palatal infiltration (the greater palatine nerve and/or of the nasopalatine nerve) numbs the soft tissue/bone on the palatal side. BUT they do not achieve pulpal (teeth) anaesthesia (so, maxillary infiltration on the buccal side is still needed)!
The buccal gingiva of the maxilla is innervated by_______?
The infraorbital nerve (incisor to premolar region) and the posterior superior alveolar nerve (molar region)
The nasopalatine nerve innervates _______?
From maxilla canine to canine palatal soft tissue and bone, but not pulpal anesthesia
Palatal infiltration, the needle is injected at________?
The junction of alveolus and hard palate (where the mucosa is thicker) near the greater palatine fossa (for GP nerve) or the incisive canal (for NP nerve)
Mandibular infiltration can only be used on ________ to establish pulpal anaesthesia?
Incisors, the bones are relatively thin there. Whereas in other regions, the bones are thick and only buccal mucosa anaesthesia can be established
In the maxilla region, the bones are generally thin except for the________?
Zygomatic buttress
Inferior alveolar block, the needle is placed into the ______ space.
Pterygomandibular space
The gingiva of the lingual side of teeth is innervated by?
The lingual nerve. (the sublingual nerve, a branch of the lingual nerve)
The gingiva of the buccal side of lower incisors and canines are innervated by?
The mental nerve (a branch of the IAN) Which also innervates the skin and lips around the mental nerve
The gingiva of the buccal side of lower premolars and molars are innervated by?
The long buccal nerve.
Describe the direct technique of inferior alveolar block
- place thumb on external oblique ridge
- 2nd, 3rd and 4th fingers on posterior boarder mandible
- angle syringe across from premolars on contralateral side
- pierce mucosa at a point 1cm up from the occlusal plane within the ‘V”
- needle should be parallel to the occlusal plane
- advance until touching bone, half way between thumb and finger (approx. 2cm)
- if advanced to far down to hub, try again (into the paraotid region)
- aspirate before injecting to check for vascularity
What are the attachments of the sphenomandibular ligament?
Spine of sphenoid to lingula
Where is the pterygomandibular raphe?
Attached superiorly to the pterygoid hamulus of the medial pterygoid plate, and inferiorly to the posterior end of the mylohyoid line of the mandible.
In the indirect technique of Inferior alveolar block, the needle is obstructed by the _______before swinging to the contralateral side and advance.
Internal oblique ridge
