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Figure19.4 Branches of the mylohyoid nerve that supply the
molars (1), premolars (2), incisors and canines (3), and even contralateral anterior teeth (4).
the mylohyoid groove and are found in 60–70% of man­dibles (Shiller and Wiswell1954; Chapnick1980).
Branches for the ipsilateral mandibular incisors
(Novitzky 1938; Sicher 1946; Carter and Keen 1971; Sutton1974; Madeira etal.1978; Wilson etal.1984) and contralateral incisors (Madeira etal. 1978). These pene­trate via the foramina of the mandibular symphysis and appear in 90% of mandibles (Shiller and Wiswell 1954; Sutton 1974; Madeira et al. 1978). They have been observed in 30% of dissections (Table19.3).
     351
Buccal Nerve The buccal nerve is involved in the
innervation of the mandibular molars because it gives off a series of variants:
Foramen at the level of the retromolar fossa. The buccal
nerve or any of its branches penetrates via this foramen and reaches the apices of the molars via an accessory canal (Figure 19.5). This variant was suggested by Stewart in 1932 (Stewart1932) and supported by clinical experience (Jeffries1944). The dissection-
based explana­tion of the anatomy was put forward by Sutton in 1974 (Sutton1974). The variant may occasionally escape man­dibular block.
Retromolar canal. The buccal nerve or any of its branches
can emerge at a very low level and become separated from the inferior alveolar nerve in the mandibular canal itself and emerge in the retromolar fossa (Figure19.6) via a foramen measuring 0.2–1.7
mm in diameter (Turner1864; Schejtman etal.1967; Singh1981). Before emerging behind the molars, it may give off a branch that reaches the apices of the inferior molars via an accessory canal (Schejtman etal.1967). The frequency of this variant in the general population is unknown, although it is found in 63% of Amazonian Indians (Schejtman etal.1967) and in 12% of Nordic Europeans (Löfgren1957). It is usually anesthetized with mandibu­lar block.
Finally, the mylohyoid nerve is one of the best docu­mented accessory innervations and is widely accepted by most authors (Barker and Davies 1972b; Rood 1976; Chapnick1980; Coleman and Smith1982).
Table19.3 Percentage ofcases ofmylohyoid nerve
inmandibular symphysis.
Reference Percentage
Sicher (1946) 10% Carter and Keen (1971) 12.5% Madeira et al. (1978) 50% Wilson et al. (1984) 43%
Figure19.5 Branches of the buccal nerve penetrating via a
foramen of the retromolar fossa and an accessory channel can
30%
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reach the apex of the molars.  Redrawn from Ossenberg (1986).

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352
Figure19.6 Branches of the buccal nerve emerge at a low
level, within the mandibular channel itself, and emerge in the retromolar fossa by giving off a branch to the apices of the molars.  Redrawn from Ossenberg (1986).
mandibular molars. The frequency of this variant in the general population is 1.7% (Ossenberg1986). The variant is not usually affected by mandibular block.
Accessory Branch for the Wisdom Teeth In 40% of cases,
the inferior alveolar nerve gives off a specific branch forthe third molar immediately before or after it enters the mandibular foramen (Sicher 1946; Barker and Davies1972b). There is a possibility that this branch will emerge at a high level, penetrating via its own foramen into the area of the condyle (Figure19.8), where most foramina are concentrated (Carter and Keen 1971; Barker 1972a; Haveman and Tebo1976), and thus remaining unaffected by mandibular block.
Auriculotemporal Nerve The auriculotemporal nerve emerges
from the common trunk of the third branch of the trigeminal (mandibular nerve, V
) and crosses behind and outside in the
3
highest part of the pterygomandibular space. This sensory nerve supplies the skin in the temporal region (which can reach the limits of the parietal, masseter, frontal, and supraorbital region), pinna with the tragus, external auditory canal, and posterior part of the temporomandibular joint capsule. Branches of this nerve have occasionally been found to penetrate via the foramina in the region of the condylar neck and the retromolar fossa and reach the apices of the mandibular molars (Carter and Keen1971; Sutton1974). It is worth remembering the high number of foramina present in the retromolar region (Carter and Keen1971; Haveman and Tebo1976) and the fact that nerve fibers have been found in 40% of these (Carter and Keen1971).
Figure19.7 The buccal nerve can course through a high
foramen in the temporal crest, with some branches diverting through an accessory channel that reaches the apex of the
 Redrawn from Ossenberg (1986).
molars.
Temporal crest canal. The buccal nerve or any of its
branches can penetrate via a high foramen of the ascend­ing branch behind the temporal crest (formerly the inter­nal oblique line) and continue along a canal measuring
0.5–3 mm in diameter that opens just as it passes the temporal crest at the anterior border of the mandibular ascending ramus (Figure19.7). In many cases, an acces­sory canal emerges and reaches the apices of the
Figure19.8 Branch for the wisdom tooth that emerges at a
very high level and penetrates via its own foramen.
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Figure19.9 Labial plexus with branches that cross the midline
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and may enter via the buccal foramina to supply the anterior teeth.  Redrawn from Rood (1977).
Crossed Innervation in the Region of the Incisors (Labial
For embryological reasons (mandibular
Plexus)
symphyseal cartilage) and anatomical reasons, the incisive nerve does not pass the midline of the mandible, therefore there is no contralateral crossed innervation (Olivier1927; Sicher1946) (Note: In only one case, in 535 patients, was the mandibular incisive canal found to pass the symphysis area in one series; Zhang et al. 2019.). However, the mental nerve gives off branches that form the labial plexus in the area of the mucosa and the anterior soft tissues, and these branches do cross the midline (Figure 19.9). Some of these branches can penetrate via the buccal mandibular foramina and innervate the contralateral canines and incisors (Starkie and Stewart1931; Rood1977; Pogrel etal.1997).
Other Uncertain Innervations Other nerve branches have
been involved in the accessory innervation, although these have not been verified.
     353
Meticulous dissection studies have shown that branches of the transverse nerve of the neck approach the inferior border of the mandible. However, these have never dem­onstrated contact with the periosteum or penetration via foramina in which only feeder vessels have been found (Novitzky 1938; Sicher 1946, 1950; Cook 1951; Rizzolo etal.1988). Furthermore, embryologic data demonstrates that the third branchial arch is the territory of the trigem­inal nerve and that the passage of the transverse cervical nerve to the area of the trigeminal nerve contradicts the basic principles of embryology (Barker and Davies1972b; Rizzolo etal. 1988), therefore this accessory innervation is thought to be unlikely (Chapnick1980; Coleman and Smith1982) and is probably confused with other nerve trunks, particularly with the accessory innervation of the mylohyoid nerve or the labial plexus.
Note: The transverse cervical nerve innervated the poste­rior inferior border of the mandible in one of two cadavers in one study (Lin etal.2013).
The lingual nerve may occasionally innervate the infe-
rior incisors (Stewart and Wilson 1928; Jeffries 1944;
Rood1976; Chapnick1980), although there is little ana-
tomical evidence to support this hypothesis (Coleman
and Smith1982). In 1932, Stewart reported how Wilfred
Ellison, in his anatomical dissections, found that
branches of the lingual nerve penetrated via the alveolar
vessels of the neck of the molars and premolars, suppos-
edly with the aim of Innervating them (Stewart1932).
This data has not been confirmed.
Finally, Table19.4 provides a summary of the accessory innervations of each tooth, with emphasis on cross­innervation in the area of the incisors and, to a lesser extent, of the canines, possibly owing to the course of the mylohyoid nerve (Madeira etal.1978) and the labial plexus (Starkie and Stewart1931; Rood1977; Pogrel etal.1997).
The transverse nerve of the neck, or transverse cervical
nerve (previously known as the cutaneous colli nerve), is a branch of the cervical plexus that innervates the skin between the sternocleidomastoid and the mandible. At the beginning of the twentieth century, Marshall pro­posed that it was a source of accessory innervation (Stewart1932), and the theory became very popular with various authors (Phillips1943; Jeffries1944; Cook1951; Bremer1952; Sutton1974; Rood1976) who claimed that branches of this nerve penetrated via the inferior border of the mandible and thus innervated the teeth. Evidence for this accessory innervation is only clinical, since com­plementary buccal and lingual infiltration often com­plete the pulpal anesthesia of mandibular block in the anterior teeth.
Table19.4 Summary ofaccessory innervation inmandibular
teeth.
Teeth Possibleaccessoryinnervation
Molars Mylohyoid nerve
Premolars Mylohyoid nerve Incisors and
canines
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Variant branches of the inferior alveolar nerve Accessory branches for wisdom teeth Buccal nerve Auriculotemporal nerve
Mylohyoid nerve
Even contralateral
Labial plexus

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354
This anatomical finding has been clinically verified by increasing pulpal anesthesia of these teeth with bilateral mandibular block (Yonchak etal.2001).
Approach
Unfortunately, since the cause of failure is unknown in most cases, the course of action in the posterior mandibu­lar teeth will be as follows:
1) Absence of anesthesia of the lower lip. If injection of
mandibular block is not followed by anesthesia of half of the lower lip within 5
minutes, the technique is con­sidered to have failed (Cohen et al. 1993; Hersh etal.1995; Nusstein et al.1998) and should therefore not be repeated.
2) Complementary buccal anesthesia. If soft tissue anes-
thesia of the lower lip can be verified after 5 minutes (sign that the mandibular block is taking effect), com­plementary buccal infiltration should be applied in posterior mandibular teeth that require full pulpal anes­thesia. This maneuver considerably improves pulpal anesthesia. The recommended approach is infiltration with a potent solution such as articaine 4% with epi- nephrine 1:100 000 (A- 100). A whole cartridge should be used for the buccal area in the posterior teeth to be treated (1.8 ml) (Haase et al.2008; Kanaa etal. 2009; Gazal2015).
After this infiltration, wait a further 5–10 10–15
minutes from initiation of mandibular block) to
minutes (total
ensure that pulpal anesthesia has taken full effect.
3) Complement this approach with a second injection in the
pterygomandibular space. If pain continues to be present after mandibular block with the standard solution (L-
100) and the lower lip is fully anesthetized (indicating that the inferior alveolar nerve has been anesthetized), and after administering complementary buccal anesthesia with A- 100 and waiting 10–15 minutes, then a second injection of L-
100 into the pterygomandibular space is recom­mended (now 3.6 additional 5
ml instead of 1.8 ml) and then wait an
minutes. This measure increases the efficacy of pulpal anesthesia by 5% (Annex 25). If the second injection, after a conventional approach, is Gow-
Gates technique (Haas 2011; Saatchi et al.
2018) or Laguardia–Akinosi (Haas2011), the outcome improves as this different approach can overcome some anatomical variability and/or accessory innerva­tions (Haas2011).
4) Supplementary techniques. If the above approach is not
sufficient and anesthesia fails after waiting a further 5 minutes, use supplementary techniques, namely, the PDL and the intraosseous technique (IO). If complemen­tary buccal anesthesia has been administered with a potent solution such as A-
100, then the same solution should be used in the periodontal ligament or IO technique so as not to mix two different anesthetics at the same site.
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