jueves, 26 de noviembre de 2009

Endodontics: Part 2 Diagnosis and treatment planning

As with all dental treatment, a detailed treatment plan can only be drawn up when a correct and accurate diagnosis has been
made. It is essential that a full medical, dental and demographic history be obtained, together with a thorough extra-oral and
intra-oral examination. This part considers the classification of diseases of the dental pulp, together with various diagnostic
aids to help in determining which condition is present, and the appropriate therapy.
● An accurate diagnosis of the patient’s condition is essential before an appropriate treatment
plan can be formulated for that individual.
● A logical approach to clinical examination should be adopted.
● A high quality long-cone parallel radiograph is mandatory before commencing root canal
treatment, and should be carefully examined to obtain all possible information.
● Root canal treatment may not be the most appropriate therapy, and treatment plans should
take into account not only the expected prognosis but also the patient’s dental condition,
expectations and wishes.
I N B R I E F
The importance of correct diagnosis and treatment
planning must not be underestimated.
There are many causes of facial pain and the differential
diagnosis can be both difficult and
demanding. All the relevant information must be
collected; this includes a case history and the
results of both a clinical examination and diagnostic
tests. The practitioner should be fully
conversant with the prognosis for different
endodontic clinical situations, discussed in
Part 12. Only at this stage can the cause of the
problem be determined, a diagnosis made, the
appropriate treatments discussed with the patient
and informed or valid consent obtained.
CASE HISTORY
The purpose of a case history is to discover
whether the patient has any general or local condition
that might alter the normal course of
treatment. As with all courses of treatment, a
comprehensive demographic, medical and previous
dental history should be recorded. In addition,
a description of the patient’s symptoms in
his or her own words and a history of relevant
dental treatment should be noted.
Medical history
There are no medical conditions which specifically
contra-indicate endodontic treatment, but
there are several which require special care. The
most relevant conditions are allergies, bleeding
tendencies, cardiac disease, immune defects or
patients taking drugs acting on the endocrine or
CNS system. If there is any doubt about the state
of health of a patient, his/her general medical
practitioner should be consulted before any
endodontic treatment is commenced. This also
applies if the patient is on medication, such as
corticosteroids or an anticoagulant. An example
of the particulars required on a patient’s folder is
illustrated in Table 1.
Antibiotic cover has been recommended for
certain medical conditions, depending upon the
complexity of the procedure and the degree of
bacteraemia expected, but the type of antibiotic
and the dosage are under continual review and
dental practitioners should be aware of current
opinion. The latest available edition of the Dental
Practitioners’ Formulary1 should be consulted for
the current recommended antibiotic regime.
However, when treating patients who may be
considered predisposed to endocarditis, it may be
advisable to liaise with the patient’s cardiac
2
ENDODONTICS
1. The modern concept of
root canal treatment
2. Diagnosis and treatment
planning
3. Treatment of endodontic
emergencies
4. Morphology of the root
canal system
5. Basic instruments and
materials for root canal
treatment
6. Rubber dam and access
cavities
7. Preparing the root canal
8. Filling the root canal
system
9. Calcium hydroxide, root
resorption, endo-perio
lesions
10. Endodontic treatment for
children
11. Surgical endodontics
12. Endodontic problems
Table 1 A simple check list for a medical history
(Scully and Cawson2)
Anaemia
Bleeding disorders
Cardiorespiratory disorders
Drug treatment and allergies
Endocrine disease
Fits and faints
Gastrointestinal disorders
Hospital admissions and attendances
Infections
Jaundice or liver disease
Kidney disease
Likelihood of pregnancy or pregnancy itself
PRACTICE
VERIFIABLE
CPD PAPER
NOW AVAILABLE
AS A BDJ BOOK
1*Clinical Lecturer, Department of Adult
Dental Care, Glasgow Dental Hospital and
School, 378 Sauchiehall Street, Glasgow
G2 3JZ
*Correspondence to: Peter Carrotte
Email: p.carrotte@dental.gla.ac.uk
Refereed Paper
doi:10.1038/sj.bdj.4811612
© British Dental Journal 2004; 197:
231–238
BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004 231
specialist or general medical practitioner. Not all
patients with cardiac lesions require antibiotic
prophylaxis, and such regimes are not generally
supported by the literature.2 However, if it is
agreed that the patient is at risk, they would normally
be prescribed the appropriate prophylactic
antibiotic regime, and should be advised to
report even a minor febrile illness which occurs
up to 2 months following root canal treatment.
Prior to endodontic surgery, it is useful to prescribe
aqueous chlorhexidine (2%) mouthwash.
Patient’s complaints
Listening carefully to the patient’s description
of his/her symptoms can provide invaluable
information. It is quicker and more efficient to
ask patients specific, but not leading, questions
about their pain. Examples of the type of
questions which may be asked are given
below.
1. How long have you had the pain?
2. Do you know which tooth it is?
3. What initiates the pain?
4. How would you describe the pain?
Sharp or dull
Throbbing
Mild or severe
Localised or radiating
5. How long does the pain last?
6. Does it hurt most during the day or night?
7. Does anything relieve the pain?
It is usually possible to decide, as a result of
questioning the patient, whether the pain is of
pulpal, periapical or periodontal origin, or if it is
non-dental in origin. As it is not possible to
diagnose the histological state of the pulp from
the clinical signs and symptoms, the terms acute
and chronic pulpitis are not appropriate. In cases
of pulpitis, the decision the operator must make
is whether the pulpal inflammation is reversible,
in which case it may be treated conservatively,
or irreversible, in which case either the pulp or
the tooth must be removed, depending upon the
patient’s wishes.
If symptoms arise spontaneously, without
stimulus, or continue for more than a few seconds
after a stimulus is withdrawn, the pulp may
be deemed to be irreversibly damaged. Applications
of sedative dressings may relieve the pain,
but the pulp will continue to die until root canal
treatment becomes necessary. This may then
prove more difficult if either the root canals
have become infected or if sclerosis of the root
canal system has occurred. The correct diagnosis,
once made, must be adhered to with the
appropriate treatment.
In early pulpitis the patient often cannot
localise the pain to a particular tooth or jaw
because the pulp does not contain any proprioceptive
nerve endings. As the disease advances
and the periapical region becomes involved, the
tooth will become tender and the proprioceptive
nerve endings in the periodontal ligament are
stimulated.
CLINICAL EXAMINATION
A clinical examination of the patient is carried
out after the case history has been completed.
The temptation to start treatment on a tooth
without examining the remaining dentition must
be resisted. Problems must not be dealt with in
isolation and any treatment plan should take the
entire mouth and the patient’s general medical
condition and attitude into consideration.
Extra-oral examination
The patient’s face and neck are examined and
any swelling, tender areas, lymphadenopathy, or
extra-oral sinuses noted, as shown in Figure 1.
Intra-oral examination
An assessment of the patient’s general dental
state is made, noting in particular the following
aspects (Fig. 2).
• Standard of oral hygiene.
• Amount and quality of restorative work.
• Prevalence of caries.
• Missing and unopposed teeth.
• General periodontal condition.
• Presence of soft or hard swellings.
• Presence of any sinus tracts.
• Discoloured teeth.
• Tooth wear and facets.
Diagnostic tests
Most of the diagnostic tests used to assess the
state of the pulp and periapical tissues are
Fig. 1 A facial sinus
associated with a
severe periapical
abscess on the upper
canine.
Fig. 2 An assessment
should be made of the
patient’s general
dental condition.
232 BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004
PRACTICE
relatively crude and unreliable. No single test,
however positive the result, is sufficient to make a
firm diagnosis of reversible or irreversible pulpitis.
There is a general rule that before drilling into
a pulp chamber there should be two independent
positive diagnostic tests. An example would be a
tooth not responding to the electric pulp tester
and tender to percussion.
Palpation
The tissues overlying the apices of any suspect
teeth are palpated to locate tender areas. The site
and size of any soft or hard swellings are noted
and examined for fluctuation and crepitus.
Percussion
Gentle tapping with a finger both laterally and
vertically on a tooth is sufficient to elicit any tenderness.
It is not necessary to strike the tooth with
a mirror handle, as this invites a falsepositive
reaction from the patient.
Mobility
The mobility of a tooth is tested by placing a finger
on either side of the crown and pushing with
one finger while assessing any movement with
the other. Mobility may be graded as:
1 — slight (normal)
2 — moderate
3 — extensive movement in a lateral or
mesiodistal direction combined with a
vertical displacement in the alveolus.
Radiography
In all endodontic cases, a good intra-oral parallel
radiograph of the root and periapical region
is mandatory. Radiography is the most reliable
of all the diagnostic tests and provides the most
valuable information. However, it must be
emphasised that a poor quality radiograph not
only fails to yield diagnostic information, but
also, and more seriously, causes unnecessary
radiation of the patient. The use of film holders,
recommended by the National Radiographic
Guidelines3 and illustrated in Part 4, has two distinct
advantages. Firstly a true image of the
tooth, its length and anatomical features, is
obtained (Fig. 3), and, secondly, subsequent
films taken with the same holder can be more
accurately compared, particularly at subsequent
review when assessing the degree of healing of a
periradicular lesion.
A radiograph may be the first indication of the
presence of pathology (Fig. 4). A disadvantage of
the use of radiography in diagnosis, however,
can be that the early stages of pulpitis are not
normally evident on the radiograph.
If a sinus is present and patent, a small-sized
(about #40) gutta-percha point should be
inserted and threaded, by rolling gently
between the fingers, as far along the sinus tract
as possible. If a radiograph is taken with the
gutta-percha point in place, it will lead to an
area of bone loss showing the cause of the
problem (Fig. 5).
Fig. 3 The anatomical detail
obtained from a radiograph taken by
the long-cone paralleling technique
(a) is far clearer and more accurate
than when the bisecting angle
technique (b) is used.
a b
Fig. 4 A radiograph taken as part
of a periodontal assessment also
reveals a previously undiagnosed
and asymptomatic periradicular
lesion on the palatal root of tooth
UL6 (26).
PRACTICE
BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004 233
Pulp testing
Pulp testing is often referred to as ‘vitality’ testing.
In fact, a moribund pulp may still give a
positive reaction to one of the following tests
as the nervous tissue may still function in
extreme states of disease. It is also, of course,
possible in a multirooted tooth for one root
canal to be diseased, but another still capable
of giving a vital response. Pulp testers should
only be used to assess vital or non-vital pulps;
they do not quantify disease, nor do they measure
health and should not be used to judge the
degree of pulpal disease. Pulp testing gives no
indication of the state of the vascular supply
which would more accurately indicate the
degree of pulp vitality. The only way pulpal
blood-flow may be measured is by using a
Laser-Doppler Flow Meter, not usually available
in general practice!
Doubt has been cast on the efficacy of pulp
testing the corresponding tooth on the other side
of the mid-line for comparison, and it is suggested
that only the suspect teeth are tested.
Electronic
The electric pulp tester is an instrument which
uses gradations of electric current to excite a
response from the nervous tissue within the pulp.
Both alternating and direct current pulp testers
are available, although there is little difference
between them. Most pulp testers manufactured
today are monopolar (Fig. 6).
As well as the concerns expressed earlier
about pulp testing, electric pulp testers may give
a false-positive reading due to stimulation of
nerve fibres in the periodontium. Again, posterior
teeth may give misleading readings since a
combination of vital and non-vital root canal
pulps may be present. The use of gloves in the
treatment of all dental patients has produced
problems with electric pulp testing. A lip electrode
attachment is available which may be
used, but a far simpler method is to ask the
patient to hold on to the metal handle of the pulp
tester. The patient is asked to let go of the handle
if they feel a sensation in the tooth being tested.
The teeth to be tested are dried and isolated
with cotton wool rolls. A conducting medium
should be used; the one most readily available is
toothpaste. Pulp testers should not be used on
patients with pacemakers because of the possibility
of electrical interference.
Teeth with full crowns present problems with
pulp testing. A pulp tester is available with a
special point fitting which may be placed
between the crown and the gingival margin.
There is little to commend the technique of cutting
a window in the crown in order to pulp test.
Thermal pulp testing
This involves applying either heat or cold to a
tooth, but neither test is particularly reliable and
may produce either false-positive or falsenegative
results.
Heat
There are several different methods of applying
heat to a tooth. The tip of a gutta-percha stick
may be heated in a flame and applied to a tooth.
Take great note that hot gutta-percha may stick
fast to enamel, and it is essential to coat the
tooth with vaseline to prevent the gutta-percha
sticking and causing unnecessary pain to the
patient. Another method is to ask the patient to
hold warm water in the mouth, which will act on
all the teeth in the arch, or to isolate individual
teeth with rubber dam and apply warm water
directly to the suspected tooth. This is explored
further under local anaesthesia.
Cold
Three different methods may be used to apply a
cold stimulus to a tooth. The most effective is the
use of a –50°C spray, which may be applied using
a cotton pledget (Fig. 7). Alternatively, though
less effectively, an ethyl chloride spray may be
used. Finally, ice sticks may be made by filling
the plastic covers from a hypodermic needle with
water and placing in the freezing compartment
of a refrigerator. When required for use one cover
is warmed and removed to provide the ice stick.
However, false readings may be obtained if the
ice melts and flows onto the adjacent tissues.
Local anaesthetic
In cases where the patient cannot locate the pain
Fig. 5 A gutta-percha point has been
threaded into a sinus tract adjacent to
a recently root-treated canine (a). The
radiograph (b) reveals the source of the
infection to be the first premolar.
a
b
Fig. 6 A modern electric pulp tester
combined with an endodontic apex
locator.
234 BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004
PRACTICE
and routine thermal tests have been negative, a
reaction may be obtained by asking the patient to
sip hot water from a cup. The patient is instructed
to hold the water first against the mandibular
teeth on one side and then by tilting the head, to
include the maxillary teeth. If a reaction occurs,
an intraligamental injection may be given to
anaesthetise the suspect tooth and hot water is
then again applied to the area; if there is no reaction,
the pulpitic tooth has been identified. It
should be borne in mind that a better term for
intraligamental is intra-osseous, as the local
anaesthetic will pass into the medullary spaces
round the tooth and may possibly also affect the
proximal teeth.
Wooden stick
If a patient complains of pain on chewing and
there is no evidence of periapical inflammation,
an incomplete fracture of the tooth may be suspected.
Biting on a wood stick in these cases can
elicit pain, usually on release of biting pressure.
Fibre-optic light
A powerful light can be used for transilluminating
teeth to show interproximal caries, fracture,
opacity or discoloration. To carry out the test,
the dental light should be turned off and the
fibre-optic light placed against the tooth at the
gingival margin with the beam directed through
the tooth. If the crown of the tooth is fractured,
the light will pass through the tooth until it
strikes the stain lying in the fracture line; the
tooth beyond the fracture will appear darker.
Cutting a test cavity
When other tests have given an indeterminate
result, a test cavity may be cut in a tooth which
is believed to be pulpless. In the author’s opinion,
this test can be unreliable as the patient may
give a positive response although the pulp is
necrotic. This is because nerve tissues can continue
to conduct impulses for some time in the
absence of a blood supply.
TREATMENT PLANNING
Having taken the case history and carried out the
relevant diagnostic tests, the patient’s treatment is
then planned. The type of endodontic treatment
chosen must take into account the patient’s medical
condition and general dental state. The indications
and contra-indications for root canal
treatment are given below and the problems of reroot
treatment discussed. The treatment of fractured
instruments, perforations and perio-endo
lesions are discussed in subsequent chapters.
It should be emphasised here that there is a
considerable difference between a treatment
plan and planning treatment. Figure 8 shows a
radiograph of a patient with a severe endodontic
problem. A diagnosis of failed root canal treatments,
periapical periodontitis (both apically
and also associated with a perforation of one
root), and failed post crowns could be made. A
treatment plan for this patient may be
orthograde re-root canal treatment, with repair
of the perforation, followed by the provision of
new posts and cores, and crowns.
However, success in this case may depend
upon the correct planning of treatment. For
example, what provisional restorations will be
used during the root canal treatment, and during
the following re-evaluation period. Temporary
post-crowns have been shown to be very poor at
resisting microleakage.4 The provision of a temporary
over denture, enabling the total sealing
of the access cavities, would seem an appropriate
alternative, but if this has not been properly
planned for, problems may arise and successful
treatment may be compromised.
INDICATIONS FOR ROOT CANAL TREATMENT
All teeth with pulpal or periapical pathology are
candidates for root canal treatment. There are also
situations where elective root canal treatment is
the treatment of choice.
Post space
A vital tooth may have insufficient tooth substance
to retain a jacket crown so the tooth may
have to be root-treated and restored with a postretained
crown (Fig. 9).
Overdenture
Decoronated teeth retained in the arch to preserve
alveolar bone and provide support or
removable prostheses must be root-treated.
Teeth with doubtful pulps
Root treatment should be considered for any
tooth with doubtful vitality if it requires an extensive
restoration, particularly if it is to be a bridge
abutment. Such elective root canal treatment has
a good prognosis as the root canals are easy to
access and are not infected. If the indications are
Fig. 7 A more effective source of
cold stimulus for sensibility testing.
Fig. 8 This complicated case exhibits a number of
different endodontic problems, and requires careful
treatment planning if success is to be achieved.
BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004 235
PRACTICE
ignored and the treatment deferred until the pulp
becomes painful or even necrotic, access through
the crown or bridge will be more restricted, and
treatment will be significantly more difficult, with
a lower prognosis.5
Risk of exposure
Preparing teeth for crowning in order to align
them in the dental arch can risk traumatic exposure.
In some cases these teeth should be electively
root-treated.
Periodontal disease
In multirooted teeth there may be deep pocketing
associated with one root or the furcation.
The possibility of elective devitalisation following
the resection of a root should be considered
(see Part 9).
Pulpal sclerosis following trauma
Review periapical radiographs should be taken
of teeth which have been subject to trauma.
If progressive narrowing of the pulp space is
seen due to secondary dentine, elective root
canal treatment may be considered while the
coronal portion of the root canal is still patent.
This may occasionally apply after a pulpotomy
has been carried out. However, Andreasen6
refers to a range of studies that show a maximum
of 16% of sclerosed teeth subsequently
cause problems, and the decision over root
canal treatment must be arrived at after full
consultation with the patient. If the sclerosing
tooth is showing the classic associated discoloration
the patient may elect for treatment, but
otherwise the tooth may better be left alone
(Fig. 10).
CONTRA-INDICATIONS TO ROOT CANAL
TREATMENT
The medical conditions which require special
precautions prior to root canal treatment have
already been listed. There are, however, other
conditions both general and local, which may
contra-indicate root canal treatment.
General
Inadequate access
A patient with restricted opening or a small
mouth may not allow sufficient access for root
canal treatment. A rough guide is that it must
be possible to place two fingers between the
mandibular and maxillary incisor teeth so that
there is good visual access to the areas to be
treated. An assessment for posterior endodontic
surgery may be made by retracting the
cheek with a finger. If the operation site can
be seen directly with ease, then the access is
sufficient.
Poor oral hygiene
As a general rule root canal treatment should
not be carried out unless the patient is able to
maintain his/her mouth in a healthy state, or
can be taught and motivated to do so. Exceptions
may be patients who are medically or
physically compromised, but any treatment
afforded should always be in the best long-term
interests of the patient.
Patient’s general medical condition
The patient’s physical or mental condition due to,
for example, a chronic debilitating disease or old
age, may preclude endodontic treatment. Similarly,
the patient at high risk to infective endocardi-
Fig. 10 A 23-year-old female patient
suffered trauma to tooth UL1 (21) when
aged 16, and is complaining about the
yellow discoloration of the tooth (a). A
radiograph (b) reveals that the pulp
space has sclerosed.
a
b
Fig. 9 Tooth UL1 (21) requires a
crown, but there is insufficient
coronal tissue remaining. One
possible treatment plan would be
elective endodontic treatment
followed by the provision of a post-
retained core build-up and crown.
236 BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004
PRACTICE
tis, for example one who has had a previous
attack, may not be considered suitable for complex
endodontic therapy.
Patient’s attitude
Unless the patient is sufficiently well motivated,
a simpler form of treatment is advised.
Local
Tooth not restorable
It must be possible, following root canal treatment,
to restore the tooth to health and function
(Fig. 11). The finishing line of the restoration must
be supracrestal and preferably supragingival.
An assessment of possible restorative problems
should always be made before root canal treatment
is prescribed.
Insufficient periodontal support
Provided the tooth is functional and the
attachment apparatus healthy, or can be made
so, root canal treatment may be carried out.
Non-strategic tooth
Extraction should be considered rather than
root canal treatment for unopposed and nonfunctional
teeth.
Root fractures
Incomplete fractures of the root have a poor prognosis
if the fracture line communicates with the
oral cavity as it becomes infected. For this reason,
vertical fractures will often require extraction of
the tooth while horizontal root fractures have a
more favourable prognosis (Fig. 12).
Internal or external resorption
Both types of resorption may eventually lead to
pathological fracture of the tooth. Internal resorption
ceases immediately the pulp is removed and,
provided the tooth is sufficiently strong, it may be
retained. Most forms of external resorption will
continue (see Part 9) unless the defect can be
repaired and made supragingival, or arrested with
calcium hydroxide therapy.
Bizarre anatomy
Exceptionally curved roots (Fig. 13), dilacerated
teeth, and congenital palatal grooves
may all present considerable difficulties if
root canal treatment is attempted. In addition,
any unusual anatomical features related to the
roots of the teeth should be noted as these
may affect prognosis.
Re-root treatment
One problem which confronts the general
dental practitioner is to decide whether an
inadequate root treatment requires replacement
(Fig. 14). The questions the operator
should consider are given below.
Fig. 11 Tooth UL1 (21) was so extensively decayed
subgingivally that restoration would have proved
impossible even if endodontic treatment had been carried
out.
Fig. 12 The vertical root fracture can be clearly seen in
this extracted tooth which had been fitted with a post
crown.
Fig. 13 The tooth UR4 (14) has such a
bizarre root canal anatomy that
endodontic treatment would probably
be impossible.
BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004 237
PRACTICE
1 Is there any evidence that the old root filling
has failed?
• Symptoms from the tooth.
• Radiolucent area is still present or has
increased in size.
• Presence of sinus tract.
2 Does the crown of the tooth need restoring?
3 Is there any obvious fault with the present
root filling which could lead to failure?
Practitioners should be particularly aware
of the prognosis of root canal re-treatments.
As a rule of thumb, taking the average of the
surveys reported in the endodontic literature
(see Part 12) suggests a prognosis of 90–95%
for an initial root canal treatment of a tooth
with no radiographic evidence of a periradicular
lesion. When such a lesion is present prognosis
will fall to around 80–85%, and the
longer the lesion has been present the more
established will be the infection, treatment (ie
removal of that infection from the entire root
canal system) will be more difficult and the
prognosis significantly lower. The average
reported prognosis for re-treatment of a failed
root canal filling of a tooth with a periradicular
lesion falls to about 65%.
The final decision by the operator on the treatment
plan for a patient should be governed by the
level of his/her own skill and knowledge. General
dental practitioners cannot become experts in all
fields of dentistry and should learn to be aware of
their own limitations. The treatment plan proposed
should be one which the operator is confident
he/she can carry out to a high standard.
1. Dental Practitioners’ Formulary 2000/2002. British
Dental Association. BMA Books, London
2. Scully C, Cawson R A. Medical problems in dentistry.
Oxford: Butterworth-Heinemann, p74, 1998.
3. National Radiographic Protection Board. Guidance
Notes for Dental Practitioners on the safe use of
x-ray equipment. 2001. Department of Health,
London, UK.
4. Fox K, Gutteridge D L. An in vitro study of coronal
microleakage in root-canal-treated teeth restored by
the post and core technique. Int Endod J 1997; 30:
361–368.
5. Ørstavik D. Time-course and risk analysis of the
development and healing of chronic apical
periodontitis in man. Int Endod J 1996; 29: 150–155.
6. Andreasen J O, Andreasen F M. Chapter 9 in Textbook
and colour atlas of traumatic injuries to the teeth. 3rd
Ed, Denmark, Munksgard 1994.
Fig. 14 Tooth UL4 (24) has previously
been root treated (and obturated with
silver points) but is symptomless.
However, the tooth now requires a full
crown restoration. A decision must be
made as to whether the tooth should
be re-treated before fitting the
advanced restoration.
BRITISH DENTAL JOURNAL VOLUME 197 NO. 5 SEPTEMBER 11 2004 238

No hay comentarios: