Sinus floor elevation utilizing the.pdf
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Sinus oor elevation utilizing thetransalveolar approach
B J A R N I E. P J E T U R S S O N & N I K L A U S P. LA N G
As implant dentistry developed, it became more evi-
dent that the posterior maxillary region was often
limited for standard implant placement because the
residual vertical bone height was often substantially
reduced as a result of the presence and pneumatiza-
tion of the maxillary sinus. Several treatment options
have been used in the posterior maxilla to overcome
the problem of inadequate bone quantity. The most
conservative treatment option would be to place
short implants to avoid entering the sinus cavity.
However, for the placement of even short implants,
there is still a need for at least 6 mm of residual bone
height. Another way of avoiding grafting the maxillary
sinus would be to place tilted implants mesially or
distally to the sinus cavity if these areas have ade-
quate bone. Furthermore, extra-long zygomatic
implants may be placed in the lateral part of the zygo-
matic bone. However, elevation of the maxillary sinusoor is considered as the treatment for solving this
problem.
Elevation of the maxillary sinus oor was rst
reported by Boyne in the 1960s. In 1980, Boyne &
James (3) described elevation of the maxillary sinus
oor in patients with large, pneumatized sinus cavi-
ties as a preparation for the placement of blade
implants. The authors described a two-stage proce-
dure: in the rst stage, the maxillary sinus was grafted
using autogenous particulate iliac bone; and, in the
second stage (approximately 3 months later), blade
implants were placed and later used to support xedor removable reconstructions (3). Such a one- or a
two-stage sinus oor elevation with a lateral window
approach is, however, a relatively invasive treatment
option.
In patients with appropriate residual bone height,
augmentation of the sinus oor can also be accom-
plished via transalveolar approach using the osteo-
tome technique (11, 26, 30). The problem of
inadequate bone height can be overcome by elevating
the maxillary sinus oor using the closed technique
to provide sufcient quantity of bone for the place-
ment of dental implants.
A transalveolar approach for sinus oor elevation,
with subsequent placement of implants, was rst sug-
gested by Tatum, in 1986 (32). A socket former for
the selected implant size was used to prepare the
implant site. A greenstick fracture of the sinus oor
was accomplished by hand tapping the socket for-
mer in a vertical direction. After preparation of the
implant site, a root-formed implant was placed and
allowed to heal in a submerged manner.
Summers (30) later described a different transalve-
olar approach using a set of tapered osteotomes with
increasing diameters (Fig. 1). This concept was
intended to increase the density of soft (type III and
type IV) maxillary bone, resulting in better primary
stability of inserted dental implants. Bone was con-served by this osteotome technique because there
was no drilling. Adjacent bone was compressed by
pushing and tapping as the sinus membrane was ele-
vated. Then, autogenous, allogenic or xenogenic
grafts were added to increase the volume below the
elevated sinus membrane.
Currently, two main techniques of sinus oor ele-
vation for dental implant placement are in use. The
rst is a two-stage technique with a lateral window
approach, followed by implant placement after a
healing period, and a one-stage technique using
either a lateral or a transalveolar approach. The sec-ond is the transalveolar approach, also referred to as
osteotome sinus oor elevation, the Summers tech-
nique or the Crestal approach, which may be con-
sidered as more conservative and less invasive than
the conventional lateral approach. In this technique a
small osteotomy is performed through the alveolar
crest of the edentulous ridge at the inferior border of
the maxillary sinus. This intrusion osteotomy elevates
the sinus membrane, thus creating a tent and
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providing space for graft placement and/or blood clot
formation. It should be noted that the grafts are
placed blind into the space below the sinus mem-
brane. Hence, the main disadvantage of this tech-
nique is the uncertainty of possible perforations of
the sinus oor (Schneiderian) membrane.
By mastering these different methods, the most
edentulous areas in the maxilla can be restored with
implant-supported reconstructions. The concept of a
shortened dental arch must also be borne in mind.
The work of Kayser (14) has shown that patients can
maintain adequate (5080%) chewing capacity with a
premolar occlusion.
Anatomy of the maxillary sinusThe maxillary sinus maintains its overall size while
the posterior teeth remain in function. It is, however,
well known that the sinus expands with age, and
especially when posterior teeth are lost. One or more
septa, termed Underwoods septa, may divide the
maxillary sinus into several recesses.
The overall prevalence of one or more sinus septa is
26.531% (15, 35) and these are most common in the
area between the second premolar and the rst molar.
Edentulous segments have a higher prevalence of sinus
septa compared with dentate maxillary segments.
The sinus is lined with respiratory epithelium
(pseudostratied ciliated columnar epithelium) that
covers a loose, highly vascular connective tissue.
Underneath the connective tissue, immediately next
to the bony walls of the sinus, is the periosteum.
These structures (epithelium, connective tissue and
periosteum) are collectively referred to as the Schne-
iderian membrane.
Indications and contraindications
The main indication for maxillary sinus oor eleva-
tion utilizing a transalveolar approach is reduced
residual bone height that does not allow standard
implant placement.
Contraindications for transalveolar sinus oor ele-
vation may be divided into two groups: medical; and
local.Medical contraindications include the following:
chemotherapy or radiotherapy of the head and neck
area at the time of transalveolar sinus oor elevation
or in the preceding 6 months, depending on the eld
of radiation; an immunocompromised status; medical
conditions affecting bone metabolism; uncontrolled
diabetes; drug or alcohol abuse; patient noncompli-
ance; and psychiatric conditions. Whether or not
smoking is an absolute contraindication for transalve-
olar sinus oor elevation remains controversial.
A recent systematic review (25) investigated the inu-
ence of smoking on the survival rate of implants
inserted in combination with sinus oor elevation uti-
lizing the lateral approach. Five of the included studies
investigated the inuence of smoking, on implant sur-
vival after sinusoor elevation. A group of nonsmokers
with 2159 implants and a group of smokers with 863
implants were compared. The group of smokers had a
higher annual failure rate of implants compared with
the group of nonsmokers (3.5% vs. 1.9%, respectively).
However, this difference did not reach statistical sig-
nicance in a Poisson regression analysis. In addition,
patients with a history of inner-ear complications andpositional vertigo are not suitable for the osteotome
technique.
Alteration of the nasalmaxillary complex that
interferes with normal ventilation, as well as mucocil-
iary clearance of the maxillary sinus, may be a contra-
indication for transalveolar sinus oor elevation.
However, such abnormal conditions may be clinically
asymptomatic or present only with mild clinical
symptoms. These conditions include viral, bacterial
and mycotic rhinosinusitis, allergic sinusitis, sinusitis
caused by intrasinus foreign bodies and odontogenic
sinusitis resulting from necrotic pulp tissue. All odon-
togenic, peri-apical and radicular cysts of the maxil-
lary sinus should be treated before sinus oor
elevation. Transalveolar sinus oor elevation under
any of the above conditions may disturb the ne
mucociliary balance, resulting in mucus stasis, sup-
rainfection or a subacute sinusitis.
Local contraindications are inadequate residual
bone height (< 45 mm) and crestal bone width not
Fig. 1. In 1994, Summers introduced a set of tapered os-
teotomes with different diameters to compress and push
the residual bone from the implant preparation into the
sinus cavity and to elevate the sinus membrane.
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allowing for sufcient primary stability of the implant.
In addition, an oblique sinus oor (> 45 inclination)
is not suitable for the osteotome technique (Fig. 2).
The reason for this is that the osteotomes rst enter
the sinus cavity at the lower level of an oblique sinus
oor, whilst still having bone resistance on the higher
level. In this situation, there is a high risk of perforat-
ing the sinus membrane with the sharp margin of the
osteotome. Absolute local contraindications for sinusoor elevation are: acute sinusitis; allergic rhinitis
and chronic recurrent sinusitis; scarred and hypo-
functional mucosae; local aggressive benign tumors;
and malignant tumors.
Surgical technique
After the presentation of the original Summers tech-
nique, only minor modications have been presented
(6, 12, 24, 26). The technique described here is a mod-
ication of the original technique (24). Presurgical patient preparation includes oral rin-
sing with 0.1% chlorhexidine for a period of 1 min.
Local anesthesia is administered into the buccal
and palatal regions of the surgical area.
A mid-crestal incision, with or without a releasing
incision, is made and a full-thickness mucoperio-
stealap is raised.
Using a surgical stent or a distance indicator, the
implant positions are marked on the alveolar crest
with a small round bur (#1). After locating the
implant positions exactly, the opening of the prep-
arations are widened with two sizes of round burs
(#2 and #3) to a diameter about half a millimeter
smaller than the implant diameter intended
(Fig. 3).
The distance from the crestal oor of the ridge tothe oor of the maxillary sinus, measured before
implant site preparation on the pre-operative
radiograph, may, in most cases, be conrmed at
the time of surgery by penetrating the opening of
the preparation with a blunt periodontal probe
through the soft trabecular bone (type III or type
IV bone) to the oor of the maxillary sinus.
After conrming the distance to the sinus oor,
small-diameter pilot drills (11.5 mm smaller than
the diameter of the intended implant) are used to
prepare the implant site to a distance of approxi-
mately 2 mm from the sinus oor (Fig. 4). In the
presence of soft type IV bone and a residual bone
height of 56 mm, there is usually no need to use
the pilot drills. It is sufcient to perforate the corti-
cal bone at the alveolar crest using the round
burs.
The rst osteotome used in the implant site is a
small-diameter tapered osteotome with a rounded
tip (Fig. 5). With light malleting, the osteotome is
pushed toward the compact bone of the sinus
oor (Fig. 6). After reaching the sinus oor, the os-
teotome is pushed about 1 mm further with lightmalleting in order to create a greenstick fracture
on the compact bone of the sinus oor. A tapered
osteotome with a small diameter is chosen to min-
Fig. 2. The oblique inferior border of the maxillary sinus
lies approximately 60to the inferior border of the alveolar
crest (the dotted lines represent the outlines of the residual
bone). In a clinical situation like this, it is difcult to ele-
vate the maxillary sinus oor using osteotomes. The os-
teotomes will rst enter the sinus cavity distally at the
lowest level of the oblique sinus oor whilst still having
bone resistance on the cranial level of the sinus oor.
Hence, the risk of the sharp margin perforating the sinus
membrane is high.
Fig. 3. The exact position of the implant site is rst marked
with a small round bur (#1) and then extended with
two sizes of round burs (#2 and #3) to a diameter about
0.51 mm smaller than that of the implant to be installed.
Transalveolar sinusoor elevation
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imize the force needed to fracture the compact
bone.
The second tapered osteotome, also with a
rounded tip and with a diameter slightly larger
than that of the rst, is used to increase the frac-
ture area of the sinus oor (Fig. 7). The second os-
teotome is applied to the same length as the rst. The third osteotome used is a straight osteotome
with a diameter about 11.5 mm smaller than the
implant to be placed (Fig. 8). Instead of using the
osteotomes to fracture the sinus oor, piezoelec-
tric surgery may be used (Fig. 9). The advantage of
this technique is that perforation of the sinus oor
may be achieved in a more controlled way than
with osteotomes and thus the risk of membrane
perforation may be reduced (28). Moreover, this
Fig. 4. The implant site is prepared to a distance approxi-
mately 2 mm below the sinus oor using a small-diameter
pilot drill.
Fig. 5. The rst osteotome used in the implant site is a
small-diameter tapered osteotome. Such an osteotome is
chosen to minimize the force needed to fracture the com-
pact bone.
Fig. 6. After reaching the sinus oor, the osteotome is
pushed approximately 1 mm further with light malletingin order to create a greenstick fracture on the compact
bone of the sinusoor.
Fig. 7. A second osteotome, which is also tapered, but with
a diameter slightly larger than the rst, is used to increase
the fractured area of the sinusoor.
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could reduce the risk of benign paroxysmal posi-
tional vertigo. The main disadvantage of this tech-
nique is that it is more time consuming than
malleting, especially when the cortical bone at the
sinusoor is relatively thick.
From this point onwards, the technique utilized in
the surgical procedure depends on whether or not
grafts will be placed.
Implant placement withoutgrafting material
Without applying grafting material, the straight
osteotome, with a diameter about 11.5 mm smal-
ler than that of the implant, will be pushed further
until it penetrates the sinus oor.
The last osteotome to be used should have a form
and diameter suitable for the implant to be
placed. For example, for a cylindrical implant with
a diameter of 4.1 mm, the last osteotome should
be a straight osteotome with a diameter about
0.5 mm smaller than the implant diameter. It is
important that the last osteotome only enters the
preparation site once. If several attempts have to
be made in sites with soft bone (type III or type
IV), there is a risk of increasing the diameter of the
preparation, which may jeopardize good primary
stability. On the other hand, if the diameter of the
last osteotome is too small compared with the
implant diameter, too much force must be used to
insert the implant. By squeezing the bone, morebone trauma, and hence greater bone resorption,
will occur, delaying the osseointegration process
(1). Therefore, it is important, especially when
placing implants in sites with reduced bone vol-
ume, that a ne balance between good primary
stability and trauma to the bone is achieved.
During the entire preparation, it is crucial to
maintain precise control of the penetration length.
Regular osteotomes have sharp cutting edges and
thus entry into the sinus cavity increases the risk
of membrane perforation. The nal step before
placing the implant is to check that the prepara-
tion is patent to the planned insertion depth. An
osteotome with a rounded tip, or a depth gauge
with a relevant diameter, is pushed to the appro-
priate length (Fig. 10).
Implant placement with graftingmaterials
When performing the osteotome technique with
grafting materials, the osteotomes are not sup-posed to enter the sinus cavity per se. Repositioned
bone particles, grafting materials and trapped uid
will create a hydraulic effect, moving the fractured
sinusoor and the sinus membrane upwards. The
sinus membrane is less likely to tear under this
kind of pressure that has auid consistency.
After pushing the third osteotome up to the sinus
oor and before placing any grafting material, the
sinus membrane must be tested for any perfora-
tions. This is performed using the Valsalva maneuver
Fig. 8. The last osteotome to be used must have a form
and diameter suitable for the implant to be placed. For
example, for a cylindrical implant with a diameter of
4.1 mm, the last osteotome should be straight with a diam-
eter approximately 0.5 mm smaller than that of the
implant. It is important that the last osteotome is allowed
to enter the preparation site only once.
Fig. 9. A kit of diamante-coated
insertion tips for piezosurgery that
can be used to prepare the implant
site and to trim down or perforate
the cortical bone at the lower border
of the maxillary sinus.
Transalveolar sinusoor elevation
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(nose blowing). The nostrils of the patient are
compressed (Fig. 11) and the patient blows their
nose against the resistance. If air leaks out of the
implant site, the sinus membrane is perforated
and therefore no grafting material should beplaced in the sinus cavity.
If no air leaks out, the sinus membrane is intact
and the preparation is lled with grafting material
(Fig. 12). The grafting material is slowly pushed
into the sinus cavity with the same straight third
osteotome (Fig. 13). This procedure is repeated
four to ve times until about 0.20.3 g of grafting
material has been pushed into the sinus cavity
below the sinus membrane (Fig. 14). At the fourth
and fth times of applying grafting material, the
tip of the osteotome may enter about 1 mm into
the maxillary sinus cavity to test if there is resis-tance in the preparation site.
Finally, before implant placement (Fig. 15), the
preparation is checked for patency, as mentioned
before, and the Valsalva maneuver is repeated.
To achieve good primary stability in the soft trabec-
ular bone on the posterior maxilla, implants with a
slightly tapered conguration, or implants with a
tulip-shaped neck, are recommended. However, it
must always be borne in mind that applying too
much force to the bone will result in greater bone
resorption, delaying the osseointegration process (1).
Postsurgical care
The postsurgical care required after implant place-
ment using the osteotome technique is similar to the
postsurgical care required after standard implantplacement. To minimize postoperative discomfort,
the surgical intervention should be carried out as
atraumatically as possible. Precautions must be taken
to avoid perforation of the ap and the sinus mem-
brane. The bone should be kept moist during surgery,
and tension-free closure of the primaryap is essen-
tial.
In addition to the standard oral care at home, rins-
ing twice daily, for the rst 3 weeks after surgery, with
Fig. 10. The nal step before placing the implant is to
check that the preparation is patent to the planned inser-
tion depth. An osteotome with a rounded tip or a depth
gauge appropriate for the diameter of the implant is
pushed to the decided length.
Fig. 11. To test the sinus membrane for perforations, the
nostrils of the patients are compressed and the patient is
asked to blow his nose. If air leaks out of the implant site,
the sinus membrane is perforated, and no grafting mate-
rial should be placed in the sinus cavity.
Fig. 12. If the sinus membrane is intact, the preparation
site is lled four to ve times with grafting material.
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0.10.2% chlorhexidine is recommended. Although
there are no studies comparing postsurgical care with
and without the use of prophylactic antibiotics, anti-
biotic prophylaxis (e.g. 750 mg of amoxicillin, three
times daily for a period of 1 week) has been recom-
mended for patients in whom bone substitutes were
used.
Complications
When performing transalveolar sinus oor elevation,
the risk of complications must be considered and the
appropriate treatment foreseen. During transalveolar
sinus oor elevation the intrusion osteotomy proce-
dure elevates the sinus membrane, thus creating a
tent. This provides space for the blood clot and/or
grafting material. An endoscopic study has shownthat the sinus oor can be elevated up to 5 mm with-
out perforating the membrane (10). It should be
noted that the bone grafts are placed blind into the
space below the sinus membrane. Hence, the main
disadvantage of this technique is the uncertainty of
possible perforation of the sinus membrane. This
constitutes the most common intra-operative compli-
cation. The presence of maxillary sinus septa and root
apices penetrating into the sinus may increase the
risk of membrane perforation. In a recent systematic
review on transalveolar sinus oor elevation (31),
eight studies with 1621 implants, out of the 19 studiesincluded in the review, presented data on the inci-
dence of perforation of the Schneiderian membrane,
which varied between 0 and 21.4%, with a mean of
3.8%.
Smaller perforations may be closed through the
transalveolar preparation by using tissue brin glue.
For larger perforations, access must be accomplished
through a lateral window, and barrier membranes,
lamellar bone plates or suture should be used, alone
Fig. 14. Grafting material is slowly pushed into the sinus
cavity using a straight osteotome. The tip of the osteotome
is only supposed to enter the sinus cavity after some graft-
ing material has been pushed through the preparation site
to elevate the sinus membrane.
Fig. 15. A rough-textured implant was installed after pre-
paring the implant site using the osteotome technique. To
achieve good primary stability, implants with a slightly
tapered conguration or implants with a tulip-shaped
neck are recommended.
Fig. 13. The grafting material is then slowly pushed into
the sinus cavity using a straight osteotome with a diameter
about 11.5 mm smaller than that of the intended implant
size.
Transalveolar sinusoor elevation
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or in combination with tissue brin glue, to close the
membrane perforation. If the perforation occurs
before any grafting material is inserted, the procedure
should be aborted and a second attempt to achieve a
transalveolar sinus oor elevation may be performed
69 months later (33, 36).
Postoperative infection after transalveolar sinus
oor elevation is a rare complication. Six studies, with
884 implants, included in the systematic review ofTan et al. (31), reported on postoperative infection.
The incidence ranged from 0% to 2.5% with a mean
of 0.8%. Other complications reported were postoper-
ative hemorrhage, nasal bleeding, blocked nose,
hematomas and loosening of cover screws, resulting
in suppuration and benign paroxysmal positional ver-
tigo (37). The benign paroxysmal positional vertigo
may cause substantial stress in the patient if not cor-
rectly identied and properly managed (26). No air
embolism was reported in the study using hydraulic
sinus condensing (6).
Grafting materials
In the original publication (32), the author did not
use any grafting material to increase and maintain
the volume of the elevated area. Later on, Summer
(30) described the bone-added osteotome sinus oor
elevation technique, frequently referred to as the
Summers technique. Tapered osteotomes with
increasing diameters were used to compress the bone
and push and tap it in a vertical direction as the sinusmembrane was elevated. Autogenous, allogenic or xe-
nogenic grafting material was added to maintain the
volume below the elevated sinus membrane.
Grafting material is added incrementally to the os-
teotomy site and condensed until the desired graft
height is reached. Pressure from the osteotomes on
the graft material and trapped uids exerts hydraulic
pressure on the sinus membrane, resulting in eleva-
tion over a larger area (6). A recent study (16) that
compared the use of the bone-added osteotome sinus
oor elevation technique with sinus oor elevation
utilizing the lateral approach, concluded minimalbone resorption for both methods. The bone resorp-
tion reported was 1.35 mm for the bone-added osteo-
tome sinus oor elevation technique and 1.36 mm
for the lateral approach over a period of 2 years after
the procedure was performed.
From the 19 studies included in the systematic
review of Tan et al. (31), 15 used grafting material. De-
proteinized bovine bone mineral was used in ve
studies, autogenous bone graft in two studies and col-
lagen in another two studies. Five studies used combi-
nations of grafts consisting of autogenous bone graft
and Bioglass; autogenous bone graft and deprotei-
nized bovine bone mineral; autogenous bone graft
and collagen; autogenous bone graft, demineralized
freeze-dried bone allograft and tricalcium phosphate;
and autogenous bone graft, deminerialized freeze-
dried bone allograft and antibiotics in the graft. Vari-
ous types of graft were used in two studies. Threestudies performed the procedure without graft place-
ment and one study did not report on the graft used.
It is still controversial whether or not it is necessary
to apply grafting material to maintain the space for
new bone formation after elevating the sinus mem-
brane utilizing the transalveolar osteotome technique.
Studies in monkeys (2) showed, that implants pro-
truding into the maxillary sinus following elevation of
the sinus membrane without grafting material, exhib-
ited spontaneous bone formation over more than half
of the height of the implant. Hence, protrusion of an
implant into the maxillary sinus does not appear to be
an indication for bone grafting. In the same study,
it was also seen that the design of the implant
inuenced the amount of spontaneous bone forma-
tion. Implants with open apices or deep-threaded
congurations did not reveal substantial amounts of
new-bone formation. On the other hand, implants
with rounded apices tended to show spontaneous
bone formation extending all around the implants if
they only penetrated 23 mm into the maxillary sinus.
However, when the same implants penetrated 5 mm
into the maxillary sinus, only partial (50%) growth ofnew bone was seen toward the apex of the implant.
A recent clinical study (22) reported similar clinical
results. The authors reported on 25, 10-mm dental
implants inserted using the transalveolar approach
without grafting material. The implants protruded, on
average, 4.9 1.9 mm into the sinus cavity after sur-
gery. After a follow-up period of 5 years, the implant
protrusion was reduced to 1.5 0.9 mm. Hence,
3.4 mm (or 70%) of the penetrating part of the
implants showed spontaneous bone formation.
In a clinical study (12), implants were installed into
the sinuses of 40 patients using the transalveolartechnique with no graft or cushion material. The
authors reported a mean gain of alveolar bone height,
determined from scanned panoramic radiographs, of
3.9 1.9 mm.
In a retrospective study that assessed, radiographi-
cally, sinus oor remodeling after implant insertion
using a modied transalveolar technique without
grafting material (27), 24 patients were available for
follow up. The implant survival rate was 100%. Bone
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lling around the implants was measured and com-
pared with baseline digital radiographs. The mean
height of the newly formed bone was 2.2 1.7 mm
mesially and 2.5 1.5 mm distally, or 86.3 22.1%
and 89.7 13.3% of new-bone formation, respec-
tively.
In a prospective study (23), 252 implants were
inserted using the transalveolar sinus oor elevation
technique, with or without grafting material. For 35%of these implants, deproteinized bovine bone mineral
of particle size 0.251 mm was used as the grafting
material, but for the remaining 164 implants, no
grafting material was utilized. Peri-apical radiographs
were made using a paralleling technique and digi-
tized. Two investigators, blind to whether or not graft-
ing material was used, subsequently evaluated the
pattern of tissue remodeling. The mean radiographic
bone gain using the trans-alveolar technique with
grafting material was signicantly more or 4.1 mm
(SD 2.4 mm) compared with a mean bone gain of
1.7 mm (SD 2.0 mm) when no grafting material was
used (Fig. 16A,B).
Success and implant survival
A recent systematic review (31) analyzed the survival
and complication rates of implants inserted in combi-
nation with transalveolar sinus oor elevation. An
electronic search was conducted to identify prospec-
tive and retrospective cohort studies on transalveolar
sinus
oor elevation, with a mean follow-up time ofat least 1 year after functional loading. The search
provided 849 titles. Full-text analysis was performed
for 176 articles, resulting in 19 studies that met the
inclusion criteria. Meta-analysis of these studies indi-
cated an estimated annual failure rate of 2.5% (95%
condence interval: 1.44.5%), translating to an esti-
mated survival rate of 92.8% (95% condence interval:
87.496.0%) after 3 years in function for implants
placed in transalveolarly augmented sinuses
(Table 1). Furthermore, subject-based analysis
revealed an estimated annual failure of 3.71% (95%
condence interval: 1.21
11.38%), which translated to10.5% (95% condence interval: 3.628.9%) of sub-
jects experiencing implant loss over 3 years.
Residual bone height
Of the 900 patient records screened for the Consensus
Conference in 1996, only 100 had radiographs of
adequate quality for analysis of the residual bone
height. In total, residual bone height was analyzed for
only 145 sinus grafts in 100 patients with 349
implants. After a mean follow-up period of 3.2 years,20 implants were lost. Of the implants lost, 13 were
initially placed in residual bone with a height of
4 mm and seven were placed in residual bone with a
height of 58 mm. None of the implants placed in
residual bone with a height of> 8 mm was lost. There
was a statistically signicant difference in implant
loss when residual bone height was 4 mm com-
pared with 5 mm (13). Hence, for implants placed
in combination with sinus oor elevation using the
A
B
Fig. 16. (A) A radiograph, taken at the 5-year follow-up
visit, of an implant placed in the rst quadrant, utilizing
the osteotome technique without grafting material. A new
cortical bony plate at the inferior border of the maxillary
sinus is clearly visible, but no bony structure can be
detected apical to the implant. (B) A radiograph (the same
patient as shown in panel (A) of an implant placed in the
second quadrant utilizing the osteotome technique with
xenograft grafting material, taken after 5 years in function
A dome-shaped structure is clearly visible, documenting a
denite increase in bone volume compared with the initial
situation The dome is surrounded with a new cortical
bony plate.
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Table1.
Annualfailureratesandsurvivalofimplantsplacedusing
thetransalveolarsinusoorelevatio
ntechnique
Study
Yearof
publication
Totalno.of
implants
Mean
follow-up
time(yea
rs)
No.of
failures
Before
loading
After
loading
Totalimplant
exp
osuretime
Estimatedfailure
rate(per100implantyears)
Estimatedsurvival
after3years(%)
Pjeturssonetal.(24)
2008
252
3.2
6
3
3
697
0.8
6
97.5
Krennmairetal.(18)
2007
14
3.7
0
0
0
52
0
100.0
Stavropoulosetal.(29)
2007
35
1
6
4
2
32
18.8
57.0
Levineetal.(20)
2007
45
1.7
5
5
0
77
6.4
9
82.3
Zhaoetal.(39)
2007
126
3.5
0
0
0
441
0
100.0
Ferrignoetal.(11)
2006
588
5
9
1
8
2641
0.1
1
99.0
Nediretal.(21)
2006
25
1
0
0
0
25
0
100.0
Chen&Cha(6)
2005
1557
3.2
8
8
0
4957
0.1
6
99.5
Deporteretal.(9)
2005
104
3.1
2
1
1
323
0.6
2
98.2
Leblebiciogluetal.(19)
2005
75
2
2
2
0
152
1.3
2
96.1
Toferetal.(34)
2004
276
2
14
10
4
558
1.7
9
94.8
Winteretal.(38)
2002
58
1.5
5
4
1
86
5.8
1
84.0
Cavicchiaetal.(5)
2001
97
2.9
8
5
3
268
2.9
9
91.4
Cosci&Luccioli(8)
2000
265
2.4
8
NR
NR
626
1.2
8
96.2
Rosenetal.(26)
1999
174
1.7
8
3
5
288
2.7
8
92.0
Bruschietal.(4)
1998
499
4.3
12
NR
NR
2158
0.5
6
98.3
Komarnyckyj&London(17)
1998
16
1
1
1
0
18
5.5
6
84.6
Zitzmann&Scharer(40)
1998
59
1.3
3
3
0
77
3.9
0
89.0
Coatoam&Krieger(7)
1997
123
1.9
6
5
1
169
3.5
5
89.9
Total
4388
103
55
28
13645
Summaryestimate(95%CI)*
2.4
8(1.3
74.4
9)
92.8
(87.496.0
)
NR,notreported.
*Basedonrandom-effectsPoissonregression,
testforheterogeneityP 5 mm. Moreover, for short 6-mm implants, the sur-
vival rate was only 48%. This clearly demonstrates
that the transalveolar sinus oor elevation technique
was most predictable with a residual alveolar bone
height of 5 mm and with implants of 8 mm.
Patient-centered outcomes
In the study of Pjetursson et al. (24), 163 patients
were examined at their follow-up visit and asked to
give their opinion on nine statements related to the
treatment. The rst two statements dealt with general
satisfaction with the treatment. The patients were
asked if they would undergo a similar treatmentagain, if needed, and the results were recorded on a
visual analog scale. The mean visual analog scale
score was 91 17 and the median (range) was 98 (0
100). The patients were also asked if they would rec-
ommend this treatment to a friend or a relative, if
indicated. The mean visual analog scale score was
90 17 and the median (range) was 97 (0100). For
both statements, only ve (3%) patients stated that
they would not be willing to undergo such a treat-
ment again.
Approximately 23% of the patients found the surgi-
cal experience unpleasant. When asked about othersurgical complications, 5% of the patients felt that
their head was tilted too far back during the surgery
and 5% of the patients experienced vertigo, nausea
and felt disoriented after the surgical procedure, but
no patient had any problem with unusual eye move-
ments. A small group ofve patients had psychologi-
cal problems after the treatment and had to seek
medical assistance (24). The authors concluded that
even though 23% of the patients reported the surgical
procedure as unpleasant, more than 90% of the
patients were willing to undergo implant therapy
again, if necessary and dentally indicated.
Conclusions and clinicalsuggestions
Randomized controlled clinical trials with sufcientstatistical power, comparing transalveolar sinus oor
elevations with sinus oor elevation utilizing a lateral
approach on one side, and with short implants on the
other side are needed for evidence-based decision
making. Moreover, randomized controlled clinical tri-
als comparing transalveolar sinus oor elevation with
and without grafting materials would be of great
value.
In the posterior maxilla with residual bone height
58 mm and a relativelyat sinus oor, elevation of
the maxillary sinus oor using the transalveolar tech-
nique, with or without grafting material, is indicated
(Fig. 17). Implants with morphometry designed to
achieve high initial stability and with moderately
rough surface geometry giving a high percentage of
bone-to-implant contact during the initial healing
phase (1), should be preferred. Implants with slightly
conical morphometry, or implants with a wider
implant neck, tend to give better primary stability in
the event of reduced residual bone height and soft
bone geometry.
Fig. 17. The ideal indication for transalveolar sinus oor
elevation is a site with a residual bone height of 57 mm
and relatively at sinus oor anatomy. The radiograph,
taken after implant placement, shows a dome-shape con-
guration of the graft. In this instance, 0.25 g of grafting
material (xenograft) was used to elevate the sinus mem-
brane (the dotted lines represent the outlines of the resid-
ual bone).
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