Local anesthesia, nitrous oxide or general anesthesia. Which form for which treatment.

Four paths to pain-free treatment

Most dental treatments are performed under local anesthesia. It is highly effective, safe and sufficient for the vast majority of procedures. When anxiety, gag reflex, extensive surgeries or special medical situations exist, there are supplementary or alternative procedures: nitrous oxide, twilight sleep (intravenous sedation) and general anesthesia.

This article explains the four procedures, their indications, risks and how Resident combines them. Anyone struggling with dental anxiety also finds here an orientation on which solution is recommended.

Local anesthesia

Local anesthesia blocks pain conduction at a defined area of the mouth. There is a complete sensation loss at tooth, gum and sometimes lip or cheek for one to four hours, depending on the anesthetic.

Modern agents like articaine or lidocaine are used, often in combination with a vasoconstrictor (e.g. epinephrine) that prolongs the effect duration and reduces bleeding in the treatment area.

Advantages:

• High effectiveness for practically all dental procedures.
• Patient remains awake and can communicate with the team.
• No accompaniment needed after treatment, no inability to drive.
• No systemic burden on the circulation in normal dosages.
• Very low complication rate with correct application.

Limits:

• Anxiety patients do not benefit from local anesthesia alone. The treatment is pain-free, but the experience remains burdensome.
• Gag reflex cannot be alleviated by local anesthesia.
• Long or complex procedures are strenuous without supplementary sedation because alertness must persist for several hours.

Nitrous oxide (N2O-O2 sedation)

Nitrous oxide is a colorless and odorless gas inhaled via a nasal mask. It acts relaxingly and pain-modulating without deep sleep. The patient remains responsive and can breathe independently, cooperate and swallow.

Nitrous oxide is administered in a controlled mixture with oxygen, typically 30 to 50 percent nitrous oxide. The effect occurs after three to five minutes and ends within a few minutes after removal of the mask.

Advantages:

• Fast onset and offset. Patient is fully oriented and able to drive again after a short time.
• Reduces anxiety and tension with moderate dental anxiety.
• Alleviates gag reflex and is therefore helpful with impressions or treatments in the rear area.
• Safe with children from about five years, well established in children’s dentistry.
• Compatible with local anesthesia, both procedures complement each other.

Limits:

• Insufficient with very strong anxiety or pronounced phobia.
• Requires cooperative nose breathing, which does not work with stuffy nose or cold.
• Not suitable for all patients: with some neurological diseases or with pregnancy in the first trimester not recommended.

Twilight sleep (intravenous sedation)

In twilight sleep sedatives and pain medications are administered via infusion. The patient sleeps superficially, breathes independently, is deeply relaxed and usually does not or only incompletely remember the course after treatment.

Substances used are often midazolam (sedation) and fentanyl or propofol (deeper sedation). Administration is by an experienced anesthesiologist under continuous monitoring of breathing, oxygen saturation and circulation.

Advantages:

• Very strong anxiety reduction, suitable for patients with dental phobia.
• Patient remains independently breathing, in contrast to general anesthesia.
• Long procedures are well tolerated.
• Amnesia effect: often no conscious memories of unpleasant phases.
• Faster recovery than after general anesthesia.

Limits:

• Accompaniment after treatment required. Patient is unable to drive for 24 hours.
• Fasting before the procedure required (at least six hours no solid food, two hours no liquid).
• Anesthesiologist with emergency equipment on site required.
• Not available in every practice.

General anesthesia

General anesthesia switches off consciousness completely. The patient breathes artificially ventilated (intubation or laryngeal mask) and is deeply sleeping throughout the entire treatment.

Modern anesthetics like propofol are used, combined with pain medications and possibly a muscle relaxant. General anesthesia is performed in the practice by an experienced anesthesiologist with full emergency equipment, or in the hospital.

Advantages:

• Complete unconsciousness, no experiencing of the procedure.
• Suitable for very long or complex procedures, e.g. several implants plus bone augmentation in one session.
• Suitable for children with extensive treatment need or with disabilities that make awake treatment impossible.
• Suitable with extreme phobia when all other procedures are insufficient.

Limits:

• Highest complication risk of the four procedures, although the absolute frequency of complications is very low.
• Fasting as with twilight sleep.
• Accompaniment and 24-hour observation after treatment required.
• Longer recovery time, often one to two days of fatigue.
• Higher costs than all other procedures, often not covered by insurance.

Comparison at a glance

Which anesthesia for which treatment

Routine treatments (fillings, root canal, single extraction)

Recommendation: local anesthesia. Supplemented with nitrous oxide with moderate anxiety or gag reflex.

Dental implantation, single or multiple

Recommendation: local anesthesia. Optionally nitrous oxide or twilight sleep with preference for more relaxation. With very anxious patients or with very complex procedures with bone augmentation, twilight sleep is a sensible option. More on implantation in the article Immediate or delayed implant.

All-on-4 or multiple implants plus bone augmentation in one session

Recommendation: twilight sleep or general anesthesia, depending on patient preference and medical situation. Several hours under local anesthesia would be strenuous for most.

Children’s dentistry with extensive treatment need

Recommendation: nitrous oxide sufficient in many cases. With very young children, pronounced anxiety or extensive treatment need in one session, general anesthesia in the hospital can be sensible.

Patients with dental phobia

Recommendation: twilight sleep is often the right solution. Anyone with a phobia should address this openly in the initial consultation. We reassure without judgment and put together the suitable anesthesia option.

Patients with pronounced gag reflex

Recommendation: nitrous oxide or with very strong gag reflex twilight sleep. Nitrous oxide significantly alleviates the gag reflex and is often sufficient.

Risks and safety

All four procedures are very safe in skilled hands. The complication rate increases from local anesthesia to general anesthesia but remains consistently low.

Allergic reactions

True allergies to local anesthetics are rare (below 0.1 percent). Often it is reactions to the vasoconstrictor (epinephrine) perceived as allergy but in reality circulation-related. We clarify allergies in the history consultation.

Airway complications

With twilight sleep and in general anesthesia there is a theoretical risk for airway problems. Therefore the presence of an anesthesiologist and continuous monitoring is mandatory.

Nausea after general anesthesia

Postoperative nausea occurs less often with modern anesthetics than before. With disposition antiemetics are preventively administered.

How Resident implements anesthesia

We offer all four procedures, with clear indication and through experienced specialists:

• Local anesthesia at all Resident locations as standard.
• Nitrous oxide available at several locations, well established in children’s dentistry and for anxiety patients.
• Twilight sleep and general anesthesia at our Winterthur location by trained anesthesiologists (Heller, Bärtsch, Benz). Indication in coordination with the treating dental team.

In the initial consultation we discuss which anesthesia form is suitable for your procedure and your personal situation. With anxiety or phobia the conversation is without judgment and without pressure. We recommend the form that is safe and tolerable for you.

More on the topic of appointment and preparation in the article on the cost estimate, on the treatment options for children in the article on early treatment in children.

Arrange an appointment for an initial consultation or call us directly if you have questions about the anesthesia option.