articol-shifman-2017
ORAL AND MAXILLOFACIAL SURGERY
DO POSTERIOR TEETH SUPRA-ERUPT WHEN OPPOSITE RESECTED SEGMENTS HAVE
General
NOT BEEN PROSTHETICALLY RESTORED?
Arieh Shifman1a, Shlomo Calderon2b*
¹Department of Oral Rehabilitation, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
²Department of Oral and Maxillofacial Surgery, Rabin Medical Center, Beilinson Hospital, Petah Tikva, Israel
DMD, Senior Clinical Lecturer
a
DMD, Professor
b
Presented by Prof. Shlomo Calderon before the International College of Prosthodontists, Biennial Congress Torino, Italy, September 2013
Received: April 04, 2016
Revised: May 04, 2016
Accepted: May 20, 2016
Published: May 23, 2016
Academic Editor: Heinz Kniha, DDS, MD, PhD, Associate Professor, Ludwig-Maximilians- München University, München, Germany
Cite this article:
Shifman A, Calderon S. Do posterior teeth supra-erupt when opposite resected segments have not been prosthetically restored? Stoma Edu J.
2017;4(1):60-65.
ABSTRACT DOI: 10.25241/stomaeduj.2017.4(1).art.6
Introduction: The aim of this study was to assess the rate and timing of possible supra-eruption of
posterior teeth opposing resected segments in a select maxillofacial group of postsurgical patients.
Methodology: Twenty patients were included. 16 underwent simultaneous segmental mandibular
resections and iliac bone graft reconstructions. The remaining 4 had partial maxillary resections with
primary closure of the defect. No patient received any prosthetic restoration. Clinical photographs
and radiographs at the last follow-up examinations were compared by superimposition to those
obtained initially (mean 6.9 years).
Results: The results of this longitudinal retrospective study showed that not even slight supra-
eruption had occurred in any of the 16 patients.
Conclusion: These findings are discussed with regard to their possible cause and prosthodontic
implications.
Keywords: super-eruption, supra-eruption, occlusion, unopposed molars, resected segments.
1. Introduction oral function in these patients was the extent of
Postsurgical maxillofacial patients occasionally soft-tissue loss.
remain without further prosthetic treatment. In lieu of the accepted notion that the presence
Patients may prefer not to undergo restorative of molar teeth is essential for proper masticatory
treatment for a variety of reasons, including function and occlusal stability,2-4 the shortened
lack of perceived esthetic impairment where dental arch (SDA) concept emerged as paradigm
only posterior segments are involved, limited shift, namely that two bilateral pairs of occlusal
functional impairment, reluctance to undergo contacts (premolar occlusion) are sufficient for
additional surgery and also for reasons of financial these functions.5-7 Studies have shown that no
constraints. marked adverse outcome has been displayed
In a study reporting on a group of 28 patients who in SDA cases, such as temporomandibular (TM)
underwent ablative tumor surgery and mandibular overloading and TM disorders or parameters
reconstructions with osseocutaneous fibula free related to occlusal stability in the SDA arch
flap 13 patients were postoperatively rehabilitated (interdental spacing in the premolar area, overbite,
with implant-supported prostheses, whereas 18 increased wear of the remaining anterior teeth, or
patients had no dental prosthetic rehabilitation.1 loss of alveolar bone supporting these teeth.5-7
These authors conclude that oral functions such Nonetheless, little attention has been given in the
as speech, diet tolerance and oral competence literature to possible supra-eruption (SE) of molar
were not directly affected by the presence of teeth in the opposing dental arch. Kiliaridis et al.8
prosthetic restorations. A decisive factor affecting examined 84 unopposed molars in 53 patients
*Corresponding author:
Professor Shlomo Calderon, DMD, Department of Oral and Maxillofacial Surgery, Beilinson Hospital, Rabin Medical Center IL-49100 Petah Tikva, Israel
Tel/Fax: +972-3-937-7207 / +972-3-937-7204, e-mail: scalder@netvision.net.il
60 Stoma Edu J. 2017;4(1):60-65. http://www.stomaeduj.com
DO POSTERIOR TEETH SUPRA-ERUPT WHEN OPPOSITE RESECTED SEGMENTS HAVE NOT BEEN
PROSTHETICALLY RESTORED?
and found that 15 teeth (18%) revealed no signs evaluation of the individual patient and have
General
of SE, 49 teeth (58%) displayed SE of less than not been used in this study. Initial and follow up
2mm, whereas 20 teeth (24%) showed moderate orthopantomographic radiographs were obtained
to severe SE. Craddock and Youngson9 examined for all cases.
155 unopposed sites in 120 subjects and found 2.3. Surgical procedures
the rate of SE in 83% of the sites. However, in both In the mandible, under general anesthesia via
studies, the pattern of missing teeth was ill-defined using a naso-endotracheal intubation, segmental
and probably not displaying SDA situations. resection of the lesion was carried out by the
In a questionnaire study of 200 Swedish dentists combined intra and extraoral approach (modified
presented with a drawing of an SDA in the Risdon or submandibular approach). Intraoral
mandible in a virtual case, 85% of them suggested wounds were closed by watertide locking and
that marked SE of the maxillary molars would interupted sutures. Mandibular fragments were
occur, whereas 13% believed in minor changes.10 positioned by maxillo-mandibular fixation in
In a large sample of patients with SDA and extreme maximal intercuspation, secured by Eric arch
SDA, Sarita et al. found that SE of unopposed teeth bars. Mandibular continuity was restored by using
was absent or mild in 12%, severe in 32% and to the titanium reconstruction plates (DePuy Synthes
opposing residual ridge (severe SE) in 56% of the Companies, West Chester, PA 19380, USA; Stryker
subjects.11 However, the authors did not provide Global Headquarters, Kalamazoo, MI 49002, USA).
data with regard to the pattern of posterior tooth Full body or hollow screws were used to secure
loss, though alluding to gradual tooth loss in their the fixation of mandibular stumps. 12,13 Cortico-
study. cancellous particulate bone was harvested from
The aim of the present study was to assess the rate the anterior iliac crest 14 supported by a crib-form
and timing of possible SE of unopposed posterior allogenic split rib.15 Soft tissues were closed by
teeth in a select group of postsurgical patients. layers. In the maxilla, using oro-endotracheal
intubation for general anesthesia, the lesion
2. Methodology was resected in toto. Primary surgical closure of
2.1. Subjects soft tissues was carried out, either by exploiting
The study group included consecutive patients the buccal pad of fat or by a palatal rotated
who were hospitalized in the Department of Oral mucoperiosteal flap or a combination of both
and Maxillofacial Surgery, Beilinson Campus, was used to facilitate closure. In the vast majority
Rabin Medical Center, Israel, during the 1990- of patients, healing was uneventful, albeit in few
2009 period. The study protocol was reviewed and patients healing was prolonged but complete;
approved by the Rabin Medical Center Institutional healing was spontaneous with the help of (or
Ethical Committee and in accordance with the using) antiseptic irrigations (0.2% chlorhexidine
Helsinki Declaration of 1975, as revised in 2000. gluconate).
Medical data such as clinical photographs, 2.4. Recall and documentation
radiographs, type of surgical procedures and Postoperatively, patients were placed on a regular
histopathological findings, were gleaned from recall schedule namely, once every 3 months for
hospital records. The inclusion criteria were: (1) the first year and thereafter once a year.
surgical resection of a tumor in a posterior region Complete evaluation was made at the preoperative
of one of the jaws limited to bone and attached soft diagnostic stage.
tissues; (2) immediate mandibular reconstruction Clinical photographs and radiographs at the last
of non-continuity defects or alternatively, primary recall visit were compared to those obtained
surgical closure of a maxillary defect; (3) no initially. Photographed slides were scanned by
adjuvant therapy such as radiation therapy or Umax Power Lock II scanner and some of the
chemotherapy; (4) no signs of temporomandibular older slides were copied by Nikon - E 28 Slide
disorders; (5) sound dentition with minimal Copying Adapter. Radiographs were scanned
restorations; (6) normal occlusion with good and superimposed on PC graphic program and
intercuspation; (7) no postoperative prosthodontic the degree of supra eruption of the unopposed
treatment and (8) keeping long-term follow-up segments evaluated.
visits.
2.2. Diagnostic evaluation 3. Results
The complete evaluation of each patient was made Twenty patients who were found to fulfill the
at the preoperative stage. Frontal and lateral views inclusion criteria were included in the study,
of the face of the patient was photographed using namely sixteen with mandibular involvement
a Nikon SLR regular end digital camera with 1:1 (Table 1) and 4 patients with maxillary involvement.
macro lens (105/2.8 Nikon macro lens focusing at (Table 2). The age of the patients ranged from 7
1.2 meters). Intraoral photographs of the dentition to 61 (mean 29.4) in the mandibular group and
in maximal intercuspation and semi-open position from 11 to 61 (14.2) in the maxillary group. In most
were taken at a distance of 30 cm with 22 lens patients ameloblastoma or its variants appeared
aperture with the same camera. Other imaging as a primary tumor of the jaws. In contrast as a
modalities such as CT, MRI, ultrasonography or primary soft tissue pathosis, patients afflicted by
angiography were rarely indicated for a complete squamous cell carcinoma could not be enrolled in
Stomatology Edu Journal 61
DO POSTERIOR TEETH SUPRA-ERUPT WHEN OPPOSITE RESECTED SEGMENTS HAVE NOT BEEN
PROSTHETICALLY RESTORED?
General Table 1. Mandibular Reconstruction Cases.
Resection
Distal Follow
No. Name Age (yrs) M/F Diagnosis Site
Tooth up (yrs)
Location
Ameloblastic
1 S.L. 7 M RT mand 45 13
fibroodontoma
Ameloblastic
2 S.D. 10 M RT mand 43 13
fibroodontoma
3 S.S. 10 M Ossifying fibroma RT mand 45 7
4 C.E. 20 M Blast injury LT mand 33 11
RT mand +
5 Y.A. 20 F Ameloblastoma 41 14
condyle
6 K.Y. 20 M Odontogenic keratocyst RT mand 45 7
7 C.Y. 22 F Ameloblastoma LT mand 33 3.5
8 A.G. 26 M Ameloblastic fibroma RT mand 43 12
9 SH.T. 30 F Giant cell tumor RT mand 41 10
10 G.E. 32 M Ameloblastoma LT mand 35 2.2
11 C.B. 33 F Ameloblastoma LT mand 33 13
RT mand +
12 D.S. 38 F Ameloblastoma 42 5
condyle
13 R.A. 40 F Aneurismal bone cyst RT mand 44 10
14 V.E. 42 F Ameloblastoma LT mand 33 2.3
Mucoepidermoid
15 S.O. 59 F LT mand 35 4
carcinoma
16 R.Y. 61 M Giant cell tumor LT mand 31 7
Table 2. Maxillary Reconstruction Cases.
Resection
Distal Follow
No. Name Age (yrs) M/F Diagnosis Site
Tooth up (yrs)
Location
Ameloblastic
1 B.A. 11 F RT max 13 9
fibroodontoma
Ameloblastic
2 C.M. 14 F LT max 23 10
fibroodontoma
3 K.Y. 16 M Sialoodontogenic cyst RT max 13 4
4 M.M. 16 F Odontogenic myxoma LT max 22 10
this study. The results of this study showed that These results are in contrast with those obtained
not even slight SE had occurred in any patient. by Sarita et al.11 However, in their study tooth loss
This is seen in examples of cases in Figs 1-5. The was gradual, whereas in our study loss of teeth
condition of the temporomandibular joints was occurred in a single surgical procedure. As a result,
not evaluated. the tongue could immediately fill the intraoral
space created. It is conjectured that the lateral
4. Discussion aspect of the dorsum of the tongue came into
The results of this long term retrospective study contact with the occlusal surface of the posterior
were unexpected. Super eruption had not teeth and prevented their subsequent eruption.
occurred apparently even slightly in any single Stabilization of the mandible during swallowing
patient regardless of the age of the patient, the that is normally affected by the occlusal intercuspal
location and extent of the surgical resection and contact is affected by closure onto the interposed
the follow up period. tongue.
62 Stoma Edu J. 2017;4(1):60-65. http://www.stomaeduj.com
DO POSTERIOR TEETH SUPRA-ERUPT WHEN OPPOSITE RESECTED SEGMENTS HAVE NOT BEEN
PROSTHETICALLY RESTORED?
General
Figure 1. Ameloblastoma. Figure 2. Six Months post-operative. Repair with split
rib and reconstruction plate.
5. Conclusion
Posterior teeth opposing unrestored resected
segments of the maxilla or mandible did not supra-
erupt over long periods of time. It is speculated
that the interposition of the tongue to brace the
mandible on swallowing prevents the unopposed
molars and premolars from supra-erupting.
Figure 3. Six years post-operative. No supra-eruption
of the teeth opposing the resected section.
Moreover, it seems that the ventral surface of the
tongue can also function in this manner preventing
super eruption of mandibular teeth. It is noteworthy
that super eruption did not occur in patients were
the surgical reduction extended beyond the Figure 4. Ameloblastoma. Treated by hemi
definition of the SDA to include premolars, canines mandibulectomy and restored with split rib and
and even the incisor teeth. These situations may reconstruction plates.
be considered as unilateral ultra-shortened dental
arches. Even in patients who underwent partial
glossectomies, the remaining tongue appeared to
preserve oral function and hinder super eruption.
However, prosthetically augmenting the palate
for lowering the occlusal plane and thus enabling
the remaining tongue to keep the bolus over the
dorsal surface, is still advocated in some patients.16
Further lowering the occlusal plane may bring
it below the maximum ability of the buccinators
contraction.17
To summarize, within the limits of this study,
restoration of the posterior jaw defects merely
for prevention of future super eruption appears
unjustified. Thus the time-old principle by
DeVan “Our objective should be the perpetual
preservation of what remains rather than the Figure 5. Twenty two years post operative. No supra-
meticulous restoration of what is missing.” is still eruption of the unopposed maxillary teeth opposite
valid.18 the resected segment.
Stomatology Edu Journal 63
DO POSTERIOR TEETH SUPRA-ERUPT WHEN OPPOSITE RESECTED SEGMENTS HAVE NOT BEEN
PROSTHETICALLY RESTORED?
Acknowledgments to this study. There are no conflicts of interest and
General The authors declare no conflict of interest related no financial interests to be disclosed.
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Arieh SHIFMAN
DMD, Senior Clinical Lecturer
Department of Oral Rehabilitation
Sackler School of Medicine
Tel Aviv University, Tel Aviv, Israel
CV
He graduated from the Hadassah Dental School Jerusalem (DMD). He got his advanced Education at Sloane
Kettering USA specializing in Maxillofacial Prosthodontics and Prosthodontics. He is Head of the IDF Dental
Prosthetic unit. He is also Chief Consultant in Maxillofacial Prosthodontics and Temporomandibular Disorders
at the Beilinson Hospital Petach Tikva. He is Head of the Prosthodontics and Prosthodontic graduate program
IDF. He is also Honorary member of the International College of Prosthodontists.
64 Stoma Edu J. 2017;4(1):60-65. http://www.stomaeduj.com
DO POSTERIOR TEETH SUPRA-ERUPT WHEN OPPOSITE RESECTED SEGMENTS HAVE NOT BEEN
PROSTHETICALLY RESTORED?
Questions
General
A “shortened dental arch” is defined as:
q a. An arch from canine to canine;
q b. An arch missing molar teeth;
q c. The presence of two bilateral pairs of occlusal contacts (premolar occlusion);
q d. The presence of 10 teeth per arch contacting each other.
Immediate bony reconstruction of a posterior segmental mandibular resection, without
replacement of the lost teeth, leads to:
q a. Supra-eruption of the unopposed molars;
q b. No supra-eruption of the unopposed molars;
q c. Earlier loss of remaining teeth due to increased wear;
q d. Bilateral increase of the curve of Spee.
Which is not a possible adverse outcome of a shortened dental arch?
q a. Bruxism;
q b. Increased wear of the remaining anterior teeth;
q c. Interdental spacing in the premolar area;
q d. Temporo-mandibular-joint overload.
After ablative surgery with immediate bony reconstruction, supra-eruption of unopposed
teeth is avoided because of:
q a. Old age;
q b. Follow-up visits;
q c. Tongue interposition;
q d. Absence of any tooth filling.
Stomatology Edu Journal 65