autotransplantation of impacted maxillary canines into
TRANSCRIPT
196 | The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020
CASE REPORT
Autotransplantation of impacted maxillary canines into surgically modified sockets and orthodontic treatment: a 4-year follow-up case report
Juan Zufía, DDS, MSc
Private Practice, Madrid, Spain
Francesc Abella, DDS, PhD
Department of Endodontics and Restorative Dentistry, Universitat Internacional de
Catalunya, Sant Cugat del Vallès, Barcelona, Spain
Ramon Gómez-Meda, DDS, MSc
Private Practice, Ponferrada, Spain
Helena Blanco, DDS, MSc
Private Practice, Madrid, Spain
Miguel Roig, DDS, PhD
Department of Aesthetic and Restorative Dentistry, Universitat Internacional de
Catalunya, Sant Cugat del Vallès, Barcelona, Spain
Correspondence to: Dr Francesc Abella
Universitat Internacional de Catalunya, Dentistry Faculty, C/Josep Trueta s/n, 08195 Sant Cugat del Vallès, Spain;
Tel: + 34 504 2000, Fax: +34 504 2031; Email: e-mail: [email protected]
ZUFIA ET AL
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Abstract
The permanent maxillary canine is the second most
frequently impacted or displaced tooth. The standard
treatment for an impacted canine includes, among
other things, surgical exposure and orthodontic align-
ment. Surgical techniques for this procedure vary de-
pending on whether the tooth is labially or palatally
impacted, while orthodontic techniques vary accord-
ing to clinical judgment and experience. Autotrans-
plantation is a treatment alternative for impacted ca-
nines with complete root formation. The success of
tooth transplantation depends on the vitality of the
periodontal ligament (PDL) attached to the donor
tooth, and its viability decreases when it is exposed
extraorally. This article reports on maxillary canine au-
totransplantations combined with connective tissue
grafts (CTGs) and orthodontics. The recipient me-
siodistal space was created orthodontically and the
recipient socket was prepared using dental implant
drills. Following transplantation, bone defects were
grafted using guided bone regeneration (GBR). At
4 years post-transplantation, the soft tissue level was
stable and periapical radiographs showed a practically
normal contour of the alveolar crest around teeth 13
and 23. The two permanent canines presented no
root resorption and ankylosis, and no signs of inflam-
mation or bleeding were observed. The procedure
used in this case report demonstrates that canine
transplantation combined with GBR, plastic surgery
procedures, and orthodontic treatment may yield ac-
ceptable and predictable esthetic results.
(Int J Esthet Dent 2020;15:196–210)
197The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 ||
CASE REPORT
198 | The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020
or ectopic site and the creation or modifica-
tion of a socket at the recipient site. This is
followed by replantation of the tooth into the
ideal three-dimensional (3D) position within
the alveolus.
The prognosis of autotransplanted teeth
is determined by several conditions includ-
ing patient age and gender, developmental
stage and root anatomy of the donor tooth,
adequate alveolar bone support, atraumatic
surgical technique, adaptation of the donor
tooth to the recipient site, method of fixa-
tion/stabilization, and postoperative care. It
goes without saying that the clinician’s ex-
perience is equally essential.10 However, the
most critical factor for long-term success is
to maintain healthy and viable periodontal
ligament (PDL) cells on the root surface.11
Implants and removable or fixed partial den-
tures can also offer good alternatives, but
unlike natural teeth that have a normal PDL
and a natural esthetic, the use of artificial
material is a drawback.12 Autotransplants not
only maintain alveolar bone, they also trump
implants in that they allow proprioception
during function, and can be performed in
growing patients.13
The present case report presents a 40
year-old female. Teeth 53 and 63 have mo-
bility type II and impacted maxillary canines.
The treatment plan called for a series of
periodontal surgeries combined with ortho-
dontics and autotransplantation of teeth 13
and 23. The treatment lasted 1 year and
8 months, with the last clinical and radio-
graphic control carried out 4 years post-
treatment. The procedure described in this
article aimed to demonstrate that autotrans-
plantation is also a reliable alternative in cas-
es of impacted canines.
Case presentation
A 40-year-old female presented at the clinic
complaining of increased mobility in the
maxillary primary canines and of the un-
Introduction
According to clinical and radiographic as-
sessment, impacted teeth are described as
those that either erupt late or are not pre-
dicted to erupt completely. The incidence
of tooth impaction has been reported to
vary from 5.6% to 18.8% of the population.1
After the third molar, the second most fre-
quently impacted tooth is the permanent
maxillary canine, the impaction of which
has a prevalence of some 2% in the general
population.2 Of these, 85% are palatally im-
pacted, and 15% are labially impacted.3 The
maxillary canine performs a vital role in fa-
cial appearance, dental esthetics, lip sup-
port, arch development, functional occlu-
sion, and phonetics.4 In contrast, the
incidence of impacted mandibular canines
does not exceed 0.5%.5
The main treatment options available for
impacted canines include the wait-and-see
approach, interception, surgical exposure
(with or without orthodontic alignment), au-
totransplantation, and extraction. The two
most common methods used to bring pala-
tally impacted canines into occlusion con-
sist of: 1) surgically exposing the teeth and
allowing them to erupt naturally during early
or late mixed dentition; and 2) surgically ex-
posing the teeth and bonding an attach-
ment to move the tooth using orthodontic
forces.6,7
Orthodontic appliance treatment is some-
times hazardous or impractical, especially
when impacted maxillary canines are in
oblique/horizontal positions.8 Moreover, or-
thodontic treatment is not always accepted
by patients due to the 2- to 3-year treatment
time, and factors such as the position of the
canines as well as esthetic and economic
considerations. In such cases, if there is suffi-
cient space for the transplanted tooth, auto-
transplantation might provide a treatment al-
ternative.9 This process entails atraumatic
surgical removal of a tooth from its impacted
ZUFIA ET AL
199The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 |
in the adjacent teeth (Fig 2a). It was decided
to perform cone beam computed tomogra-
phy (CBCT) to find out the exact position of
the permanent canines and to ascertain
whether autotransplantation of these teeth
was viable for replacing the primary canines.
After evaluating the different CBCT slices
(sagittal, coronal, and axial views), both ca-
nines were observed to be palatally placed,
making an autotransplantation technique
perfectly possible (Fig 2b to d). Due to the
patient’s age, and because orthodontic
treatment is prolonged, the surgical expo-
sure technique followed by orthodontic
traction was ruled out. The patient was fully
informed that in the event of autotransplan-
tation failure, the definitive treatment would
consist of either an implant or a fixed dental
prosthesis.
sightly aspect of her anterior teeth. At the
first appointment, the patient’s medical and
dental records showed no history of sys-
temic disease or drug allergies, and that she
was taking no medication. Clinical and ra-
diological testing to exclude pathological
processes revealed no contraindications for
dental treatment.
The pretreatment records showed nor-
mal vertical facial proportions, a straight
profile, and good facial symmetry. The initial
intraoral photograph confirmed that the
maxillary left and right primary canines were
retained and restored with composite resin
(Fig 1). Teeth 12 and 22 presented Miller
Class III gingival recessions, although anoth-
er clinician had previously attempted to cor-
rect them by performing two free epithelial
grafts. As seen in Figure 1, the result was un-
successful and unsightly. Analysis of the
dental casts disclosed a Class III molar rela-
tionship tendency on both sides. The maxil-
lary overjet was 2.0 mm and the overbite
4.0 mm, and the patient had no crossbites.
In addition, the upper midline shifted to the
left by 1 mm.
The panoramic radiograph showed that
both maxillary canines were impacted with-
out producing any apparent root resorption
Fig 1 Preoperative
view showing the
presence of axillary
primary canines and
Miller Class III gingival
recessions in teeth 12
and 22.
Fig 2 Pretreatment radiographic study. (a) Panoramic radiograph. (b) Coronal view of the cone beam computed tomography (CBCT) image.
(c and d) Axial and sagittal views revealing the palatal position of both maxillary permanent canines.
dc
ba
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200 | The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020
Fig 3 Root coverage surgery on teeth 12 and 22. (a) Connective tissue graft on tooth 12 by means of a coronally
advanced tunnel flap (CATF) technique. (b) Same surgical procedure performed on tooth 22. (c) Final situation AA
immediately after the two connective tissue grafts. (d) Clinical appearance at 3 weeks post periodontal surgery.
a b
c d
Fig 4 (a) Multibracket orthodontic treatment started at 3 months postsurgery. (b) Careful extraction of the
maxillary right primary canine. (c) The recipient site postextraction. (d) Surgical exposure of the maxillary right
permanent canine.
a
c
b
d
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201The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 |
formed gently with an excavator with the
aim of avoiding damage to the healthy PDL
remnants on the root (Fig 4d). When suffi-
cient bone was removed, the impacted ca-
nines were delicately elevated from their
sockets. Once the extractions had been
completed, the previously calculated digital
measurements (root length, total tooth
length, and diameter) were checked quickly
with a periodontal probe, and the teeth
were placed in saline solution until they
were transplanted. The curvature of the root
of the permanent canines meant that both
roots had to be shortened to better accom-
modate them in the recipient sites.
At this point, the work was divided into
two parts: one clinician prepared the new
sockets so that the teeth could be placed in
their correct anatomical position (Fig 5),
while another performed the endodontic
treatments and sealed the root-end cavities
with an apical plug using white root repair
material (ProRoot MTATT ; Dentsply Sirona) (Fig
6). Endodontic treatments and apical retro-
fillings were performed to avoid contamina-
tion of the bone substitute used to regener-
ate the cavities resulting from the extraction
of the canines. These cavities were suffi-
ciently large to facilitate the atraumatic ex-
traction of the impacted canines.
The recipient sites were modified by a
surgical implantology set (Camlog Biotech-
nologies). The entire milling sequence was
used up to the 6-mm-diameter drill, which
was moved from palatine to buccal with an
oscillating movement to form an ovoid re-
cipient capable of harboring the root of
both permanent canines. Care was taken to
preserve the entire buccal cortical plate.
The height of the palatal cortical plate was
preserved only in the area 2 mm coronal to
the right maxillary canine, and disappeared
completely during the site preparation to
house tooth 23. Given the amount of bone
removed in the palatal alveolar process, an
allograft human bone (Barcelona Tissue
Treatment objectives
The objectives were to obtain root cover-
age of teeth 12 and 22 and replace the pri-
mary canines with the permanent ones by
means of autotransplant surgery. At the
same time, the esthetics of the anterior
teeth would be improved and the soft tissue
profile maintained.
Treatment progress
The first phase consisted of performing root
coverage surgery on teeth 12 and 22
through two connective tissue grafts (CTGs)
by means of a coronally advanced tunnel
flap (CATF) technique (Fig 3).AA After 3 months
of healing, multibracket orthodontic treat-
ment was started (Dolphin Aesthetic SLB
MBT 022; Ortolan) to align and level all the
teeth and to open up the space in the pri-
mary canine area (previously measured in
the CBCT) where the permanent canines
would be seated in an ideal 3D position (Fig
4a). The DICOM (Digital Imaging and Com-
munications in Medicine) files obtained
from the CBCT were used to measure the
length, height, and width of the permanent
canines. The distance between the trans-
planted canines and the neighboring teeth
was digitally calculated at about 2 mm to
provide sufficient space for the biologic
width and to achieve an optimum esthetic
outcome. The first phase of the orthodontic
treatment lasted 12 months.
After completing the first phase of the
treatment, autotransplantation surgery was
performed. First, the primary canines were
extracted carefully so as not to damage the
buccal cortical plate at any time (Fig 4b and
c). Bone covering the impacted teeth was
gradually demarcated using a piezoelectric
handpiece under abundant water-cooling
irrigation until a thin layer of bone was left
close to the cementum and enamel. Final
elevation of the bone as a block was per-
CASE REPORT
202 | The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020
Fig 5 Preparation of the alveolar bed to receive the donor tooth. (a) Initial dimensions of the recipient socket. (b)
Modification of the recipient socket using dental implant drills. (c) The recipient site after the surgical preparation.
Fig 6 Apical preparation of the permanent canine. (a) Comparison of dimensions between the permanent
maxillary canine and the primary canine. (b) Enlargement and resection of the apical 3 mm. (c) Endodontic
treatment completed extraorally. (d) Apical plug with white ProRoot MTATT . (e) Donor tooth coated with enamel
matrix proteins before placement in the recipient socket.
ca
d
b
e
a
b c
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203The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 |
Fig 7� Placement procedure of the right maxillary canine. (a) New connective tissue graft placed to stabilize the
gingival margin. (b) Try-in of the donor tooth. (c and d) Allograft human bone inserted between the root and the
palatine mucosa. (e) Bioresorbable membrane placed between the bone substitute and the flap. (f) Final position of
the donor tooth and suture.
Bank) between the root and the palatine
mucosa was placed. Then, a bioresorbable
membrane (OsteoBiol Evolution mem-
brane; Tecnoss) was inserted between the
bone substitute and the flap (Figs 7 and 8).
Before placing the permanent canines
on the modified recipient sites, they were
coated with enamel matrix proteins (Em-
dogain; Straumann), which facilitate the re-
generation of possible injured periodontal
tissue. At the same time, two new CTGs
were placed to stabilize the gingival margin
before the final suture. The upper archwire
system was maintained in order to passively
hold the permanent canines, which were
anchored to the arch by two brackets. The
canines were also splinted in the palatal sur-
face with a segment wire (0.012 nickel-tita-
nium) and composite resin for 30 days
(Fig 9a). In both canines, the time between
removal and placement of the impacted
tooth in the new socket did not exceed
25 min. In addition, to avoid canine-guided
occlusion during healing, occlusal lifts were
temporary placed on the maxillary incisors,
second premolars, and first molars (Fig 9b
and c).
After 1 month, new CTGs were per-
formed in both canine areas to finish re-
moving the epithelial remains from previous
surgeries (Figs 10 and 11). Advantage was
taken of these grafts to improve the bio-
types, stabilize the margins, and treat the
postsurgical residual recessions. The ortho-
b
d
f
a
c
e
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204 | The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020
Fig 8 lacement procedure of the left maxillary canine. (a) Palatal flap elevated from left canine region. (b) Surgical
exposure of the donor tooth. (c) Modification of the socket to allow the permanent canine to be replanted. (d)
Try-in of the donor tooth. (e) Allograft at the donor site. (f) Adjustment of the membrane to the bone defect.
ba
dc
fe
Fig 9 Final position of the autotransplanted teeth
anchored to the arch by two brackets. (a) Buccal view.
(b) Palatal view. (c) Aspect of healing at 30 days.
c
a b
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205The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 |
b
d
f
a
c
e
g
Fig 10 Connective tissue graft performed on the right
maxillary canine area. (a and b) Measurement of the
area to be grafted. (c and d) Removal of epithelial
remains from previous surgeries. (e) Obtaining the
connective tissue graft. (f) Tunnel connective tissue
graft. (g) Final suture.
dontic appliances were completely re-
moved 6 months after autotransplant sur-
gery. After the healing of these third
connective grafts, the case was terminated
by performing an external bleaching as well
as direct composite restorations on teeth 12
and 22 to correct the wear and to shape the
anatomy of the teeth (Fig 12). The occlusion
was stabilized using a lingual bonded retain-
er (from teeth 33 to 43) and an upper Essix
retainer. The total treatment time was 1 year
and 8 months.
Four years after the transplantation, the
soft tissue level was stable, and periapical
radiographs showed a practically normal
contour of the alveolar crest around teeth
13 and 23 (Fig 13). No signs of inflammation
or bleeding were observed.
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206 | The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020
Fig 11 Connective tissue graft performed in the left
maxillary canine area. (a) Final size of the connective
tissue graft. (b) Stabilization of the connective tissue
graft. (c) Buccal aspect of the anterior teeth immediate-
ly after the connective tissue grafts.
a
c
b
Fig 12 External bleaching and direct composite restorations on teeth 12 and 22. (a and b) Occlusal adjustment in
eccentric movements. (c) Palatal view of the transplanted canines (d and e) Radiographic views.
a
c
b
d e
ZUFIA ET AL
207The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 |
with an open apex, are similar to those of
dental implants.13,19 When a donor tooth has
incompletely formed roots, pulp revascular-
ization allows for pulp healing and continual
root development. Thus, in most cases, no
endodontic treatment is required, allowing
for short treatment times, few pulpoperiapi-
cal problems, and almost no root frac-
tures.20 These advantages partly account for
the high success rates of autotransplants of
immature teeth, a procedure particularly in-
dicated in growing patients.21,22
Recent studies have also reported high
success rates in donor teeth with a closed
apex.11,23,24 In their meta-analysis of auto-
transplantation of maxillary canines, Grisar
et al15 showed an 87.5% outcome rate at 2 to
5 years follow-up, and 88.2% at over 5 years
follow-up. The pulp of a completely mature
tooth cannot generally regenerate. Hence,
if the tooth to be transplanted is accessible,
endodontic treatment should be completed
before transplantation;25 otherwise, the
endodontic treatment should be initiated
2 weeks after transplantation to avoid an in-
flammatory resorption from the infected
root canal.13 Endodontic treatment can also
be performed during the same surgical pro-
cedure (but was not done in this case) when
Discussion
The management of impacted canines is
important in terms of esthetics and func-
tion.14 Clinicians should plan treatments that
are in the best interests of the patient; there-
fore, they need to be knowledgeable about
the range of treatment options. Although
transplantation is not usually first-line treat-
ment for patients with impacted canines,
this procedure presents a mean survival of
14.5 years for 83% of transplants, making it a
viable option.8
Clinicians should take into account two
main factors when considering autotrans-
plantation for impacted maxillary canines: 1)
the anatomical complexity involved in ac-
commodating the canine with orthodontic
traction; and 2) the patient’s willingness to
wear orthodontic appliances or undergo
long-term treatment.15 Other factors to con-
sider include the available space in the arch
for autotransplantation, the prognosis of the
primary canines, the possibility of perform-
ing an atraumatic extraction while maintain-
ing the viability of the PDL, and the clini-
cian’s experience.16-18
The longevity and prognosis of tooth au-
totransplantation, particularly donor teeth
Fig 13 Follow-up at 4-years posttreatment.
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208 | The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020
Despite the successful result of this case,
the autotransplantation technique may
present complications, such as root resorp-
tion and attachment loss, which could even
result in tooth loss, making the treatment
outcome difficult to predict.
Conclusions
Autotransplantation combined with ortho-
dontic treatment provides a viable treatment
alternative for impacted canines. The most
important factor for success is that a vital
(and functional) PDL must be attached to
the autotransplanted tooth. Necrosis or me-
chanical loss of the PDL leads to root re-
sorption (ankylosis or inflammatory resorp-
tion) or epithelial downgrowth. Even in
cases with extensive buccal or palatal/lin-
gual alveolar bone atrophy, promising and
optimally functional outcomes can be ob-
tained with the use of GBR. In this case,
modified surgical techniques allowed for a
minimally traumatic removal of the donor
teeth. Finally, it should be noted that CBCT
imaging is mandatory to develop a success-
ful treatment plan.
Disclaimer
The authors declare that there are no con-
flicts of interest.
longer splinting periods are estimated. As
initial primary stability is crucial to the suc-
cess of autotransplantation,26 additional
damage to the PDL was avoided by per-
forming premature endodontic treatment.
The treatment was not postponed, which
would have jeopardized the success of the
guided bone regeneration (GBR) in an in-
fected root canal.
To increase the success rate of tooth au-
totransplantation and make it more predict-
able, it is necessary to be meticulous re-
garding the selection criteria, and to assess
in detail the viability of the donor tooth. In
this sense, low-dose CBCT is the more suit-
able technology for planning the surgical
feasibility and the optimal 3D position of the
donor tooth in the new socket.27,28 From the
CBCT files, computer-aided designed
3D-printed replicas of the donor tooth can
be obtained, although they were not used in
this case. Tooth replica acts as a surgical
guide; provides individualized bone adapt-
ability; and reduces extra-alveolar time for
the donor tooth, thus lowering the risk of
ankylosis.29,30
On the other hand, the treatment of gin-
gival recessions through plastic surgery pro-
cedures is both functionally and esthetically
essential, particularly in anterior teeth.31 The
main objective of these procedures is to
achieve complete root coverage, while im-
proving esthetics, hypersensitivity, and pre-
vention of caries and noncarious cervical
lesions. In this case, a series of periodontal
surgeries were performed, combined at dif-
ferent times with orthodontic treatment.
Various systematic reviews, including Cairo
et al32 and Sanz and Simion,33 have con-
firmed that the gold standard for root cover-
age consists of a coronally advanced flap
combined with a CTG. It has been shown
that the use of a CTG allows for a more sta-
ble coronal advance and less soft tissue
shrinkage. It also leads to increases in kerati-
nized tissue.34
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209The International Journal of Esthetic Dentistry | Volume 15 | Number 2 | Summer 2020 |
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