NEET MDS Lessons
Endodontics
Weine Classification
The Weine classification divides root canal systems into three main categories:
The pulp canal system is complex, and it may branch, divide, and rejoin. Weine categorized the root canal systems in any root
into four basic types. Others, using cleared teeth in which the root canal systems had been stained with hematoxylin dye, found a
much more complex canal system. They identified eight pulp space configurations, that can be briefly described as following :
Type I : A single canal extends from the pulp chamber to the apex (1).
Type II: Two separate canals leave the pulp chamber and join short of the apex to form one canal (2-1).
Type III: One canal leaves the pulp chamber and divides into two in the root; the two then merge to exit as one canal (1-2-1).
Type IV: Two separate, distinct canals extend from the pulp chamber to the apex (2).
Type V: One canal leaves the pulp chamber and divides short of the apex into two separate, distinct canals with separate apical foramina (1-2).
Type VI: Two separate canals leave the pulp chamber, merge into the body of the root, and redivide short of the apex to exit as two distinct canals (2-1-2).
Type VII: One canal leaves the pulp chamber, divides and then rejoins in the body of the root, and finally redivides into two distinct canals short of the apex (1-2-1-2).
Type VIII: Three separate, distinct canals extend from the pulp chamber to the apex (3).
In endodontics, dental trauma often results in the luxation of teeth, which
is the displacement of a tooth from its normal position in the alveolus (the
bone socket that holds the tooth). There are several types of luxation injuries,
each with different endodontic implications. Here are the main types of dental
luxation:
1. Concussion: A tooth is injured but not displaced from its socket. The
periodontal ligament (PDL) is compressed and may experience hemorrhage. The
tooth is usually not loose and does not require repositioning. However, it can
be tender to percussion and may exhibit some mobility. The pulp may remain
vital, but it can become inflamed or necrotic due to the trauma.
2. Subluxation: The tooth is partially displaced but remains in the socket. It
shows increased mobility in all directions but can be repositioned with minimal
resistance. The PDL is stretched and may be damaged, leading to pulpal and
periodontal issues. Endodontic treatment is often not necessary unless symptoms
of pulp damage arise.
3. Lateral luxation: The tooth is displaced in a horizontal direction and may be
pushed towards the adjacent teeth. The PDL is stretched and possibly torn. The
tooth may be pushed out of alignment or into an incorrect position in the arch.
Prompt repositioning and splinting are crucial. The pulp can be injured, and the
likelihood of endodontic treatment may increase.
4. Intrusion: The tooth is pushed into the alveolar bone, either partially or
completely. This can cause significant damage to the PDL and the surrounding
bone tissue. The tooth may appear shorter than its neighbors. The pulp is often
traumatized and can die if not treated quickly. Endodontic treatment is usually
required after repositioning and stabilization.
5. Extrusion: The tooth is partially displaced out of its socket. The PDL is
stretched and sometimes torn. The tooth appears longer than its neighbors. The
pulp is frequently exposed, which increases the risk of infection and necrosis.
Repositioning and endodontic treatment are typically necessary.
6. Avulsion: The tooth is completely knocked out of its socket. The PDL is
completely severed, and the tooth may have associated soft tissue injuries. Time
is of the essence in these cases. If the tooth can be replanted within 30
minutes and properly managed, the chances of saving the pulp are higher.
Endodontic treatment is usually needed, with the possibility of a root canal or
revascularization.
7. Inverse luxation: This is a rare type of luxation where the tooth is
displaced upwards into the alveolar bone. The tooth is pushed into the bone,
which can cause severe damage to the PDL and surrounding tissues. Endodontic
treatment is often necessary.
8. Dystopia: Although not a true luxation, it's worth mentioning that a tooth
can be displaced during eruption. This can cause the tooth to emerge in an
abnormal position. Endodontic treatment may be necessary if the tooth does not
respond to orthodontic treatment or if the displacement causes pain or
infection.
The endodontic management of luxated teeth varies depending on the severity of
the injury and the condition of the pulp. Treatments can range from simple
monitoring to root canal therapy, apicoectomy, or even tooth extraction in
severe cases. The goal is always to preserve the tooth and prevent further
complications.
Prevalence
Molars of older individuals most frequently present with cracked tooth syndrome. Most cases occur in teeth with class I restorations (39%) or in those that are unrestored (25%), but with an opposing plunger cusp occluding centrically against a marginal ridge. Mandibular molars are most commonly affected , followed by maxillary molars and maxillary premolars.
Symptoms
The patient usually complains of mild to excruciating pain at the initiation or
release of biting pressure. Such teeth may be sensitive for years because of an
incomplete fracture of enamel and dentin that produces only mild pain.
Eventually, this pain becomes severe when the fracture involves the pulp chamber
also. The pulp in these teeth may become necrotic.
Clinical features
Close examination of the crown of the tooth may disclose an enamel crack, which
may be better visualized by using the following methods:
Fiber optic light: this is used to transilluminate a fracture
line. Most cracks run mesiodistally and are rarely detected radiographically
when they are incomplete.
Dye: Alternatively, staining the fractute with a dye, such as
methylene blue, is a valuable aid to detect a fracture.
Tooth slooth: this is a small pyramid shaped plastic bite
block, with a small concavity at the apex of the pyramid to accommodate the
tooth cusp. This small indentation is placed over the cusp, and the patient is
asked to bite down. Thus, the occlusal force is directed to one cusp at a time,
exerting the desired pressure on the questionable cusp.
Traditional vitality assessment methods such as heat, cold, and electric pulp testers assess neural vitality and often cause false-positive errors. As the histological assessment of pulpal status is not feasible clinically, a tool to assess the vascular flow of the pulp would be very useful.
Laser Doppler flowmetry (LDF) is an accurate method to assess the blood flow in a microvascular system
II. PULP CAPPING AND PULPOTOMY
Pulp capping and pulpotomy constitute a more conservative form of pulp therapy in comparison to pulpectomy. Although the outcome of pulp capping procedure is variable ranging from 44 to 97%, the procedure is recommended when the exposure is 1.0 mm or less and especially when the patient is young. Pulpotomy is recommended in immature permanent teeth, where pulpectomy is not advised.
The most commonly used agents for both the procedures are calcium hydroxide and MTA (mineral trioxide aggregate). The use of a laser in these procedures leads to a potentially bloodless field as the laser has the ability to coagulate and seal small blood vessels. The laser-tissue interactions make the treated wound surface sterile and also improve the prognosis of the procedure.
III. DISINFECTION OF ROOT CANALS
The ability of bacterial pathogens to persist after shaping and cleaning is one of the main reasons for endodontic failures. This is attributed to the complex nature of the root canal system, the presence of a smear layer, and the fact that large areas (over 35%) of the canal surface area remain unchanged following instrumentation with various Ni-Ti techniques.
IV. OBTURATION
Thermoplasticized gutta-percha obturation systems are one of the most efficient methods is achieving a fluid-impervious seal. Softening of the gutta-percha has been attempted with various lasers. These include argon, CO , Nd:YAG, and Er:YAG.
V.APICAL SURGERY
Apical surgery including apical resection is indicated when the previously performed root canal therapy fails and nonsurgical means are inadequate to ensure the complete removal of the pathological process.
The potential for using lasers is on the basis of the following observations:
• Ability of lasers to coagulate and seal small blood vessels, thereby enabling a bloodless surgical field
• Sterilization of the surgical site
• Potential of lasers (Er:YAG) to cut hard dental tissues without causing elaborate thermal damage to the adjoining tissues .