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| Dental
Implants and Onlay Bone Grafts in the Anterior Maxilla: Analysis
of Clinical Outcome
(*) |
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| Bone
is harvested from the mandibular symphysis. Note holes perforating
the cortical plate. |
Trimmed
graft is fixed in place to augment the anterior maxillary
alveolus. |
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| Exposure
of graft at 21 weeks. Resorption is assessed by noting the
position of the fixture screws and the new cortical plate. |
Placement of implants in augmented ridge. |
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| Radiograph
taken to check abutment connection just prior to occlusal
loading. |
Follow-up radiograph at 236 weeks after occlusal loading. |
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| Key
words: alveolar bone, bone grafting, endosseous dental
implants, esthetics. |
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Caroline
McCarthy, BDS, MMedSci
Raj R. Patel, BDS, FDS, MSc
Philip F. Wragg, BDS, FDS
Ian M. Brook, BDS, MDS, FDS, PhD
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Extraido de la revista "The International Journal of ORAL
& MAXILLOFACIAL IMPLANTS" - 2003;18:238-241 |
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| Wide-Diameter
Implant Placement and Internal Sinus Membrane Elevation in the Immediate
Postextraction Phase: Clinical and Radiographic Observations in
12 Consecutive Molar Sites
(*) |
Purpose:
To evaluate whether the combination of 5 surgical techniques
in implant dentistry could be performed simultaneously in a predictable
manner as effectively as each technique separately.
Materials
and Methods: Immediately postextraction, 12 wide-diameter
(WD) implants were placed in maxillary first and second molar
sites. The residual vertical bone height ranged between 6 and
9 mm (average 7.8 mm). An internal sinus elevation, via the osteotomy
site, was carried out in 10 sites using and osteotome tool. Implants
were then self-tapped into the osteotomy site followed by insertion
of a customize healing screw. Consequently, horizontal
gaps between the bony walls and the implant neck were filled by
either bovine bone mineral or tricalcium phosphate particles.
Full soft tissue closure around the healing cap screw was achieved
by coronal positioning of the buccal flap.
Results:
Soft tissue healing around the 12 implants was immaculate. In
10 sites, internal osteotome sinus membrane elevation resulted
in a height gain of between 2.5 and 6 mm (average 4.3 mm). Radiographically,
bone-to-implant contact was evident. All implants were integrated
and the prosthetic phase was completed after 6 months.
Discussion
and Conclusion: The combination of 1-stage technique and immediate
placement of WD implants, along with internal sinus floor elevation
and no soft tissue reflection at the time of implantation, is
an achievable task and can be performed predictably. Time, cost
and morbidity are reduce, and the prosthetic solution is also
eased for the benefit of the patient.
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| Preoperative
radiograph of the maxillary right molar before extraction. |
The osteotome bur drills through the socket site, guided
by the surgical template. |
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periapical x-ray film and its base are connected to the
surgical template by an acrylic resin. |
The 8-mm mark on the osteotome cutting bur shows the exact
bone height between the crestal extraction site and the
maxillary sinus floor. |
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| Measurement
of the osteotome sinus membrane elevation instrument before
placement. |
ß-TCP
particles are inserted by a plugger to the apical portion
of the prepared site, under the slightly elevated sinus
membrane.
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WD implant is placed, followed by insertion of a healing
screw. Remaining bony gaps, ie, buccal socket roots, are
filled with mineral particles. |
A coronally positioned buccal flap enables soft tissue closure
around implant. |
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| Periapical
radiograph shows osseous healing around the WD implant under
the slightly elevated sinus membrane. |
Soft tissue healing is established by a masticatory mucosal
collar around the 1-stage WD implant. |
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| Periapical
radiograph shows implant after 2 years in function. |
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| Key
words: dental implants, extraction site, immediate implantation,
maxillary sinus, sinus augmentation, wide-diameter dental implants. |
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Zvi
Artzi, DMD
Alex Parson, DMD
Carlos E. Nemcovsky, DMD
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| (*)
Extraido de la revista "The International Journal of ORAL
& MAXILLOFACIAL IMPLANTS" - 2003;18:242-249 |
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| Localized
Vertical Maxillary Ridge Augmentation Using Symphyseal Bone Cores:
A Technique and Case Report
(*) |
Vertical
augmentation of the alveolar ridge is intended to restore resorbed
alveolar ridges. This procedure is important for the placement
of dental implants in a favorable position and also to enhance
restoration esthetics. This article presents an approach for vertical
ridge augmentation in the anterior maxilla utilizing symphyseal
bone cores. A patient presented with 2 localized bony defects
of 7 mm on the right and 6 mm on the left were observed in relation
to the cementoenamel junction of the adjacent teeth. Two bone
cores ewre harvested from the mandibular symphysis using a trephine.
These bone cores were trapped into 2 predilled osteotomy sites
with corresponding diameters until stabilization was achieved.
The 2 sites were grafted with demineralized freeze-dried bone
allograft and a titanium-reinforced expanded polytetrafluoroethylene
membrane. After 5 months, the membranes wereremoved and vertical
ridge augmentation of 5 mm on the right and 4 mm on the left was
observed. The width of the ridge was increased as well. Two implants
were placed in favorable positions, restored after 6 months, and
followed successfully for 1 year after loading. This technique
represents a viable approach for augmentation of deficient alveolar
ridges prior to the placement of dental implants.
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| The
patient at the time of initial clinical examination. |
Periapical radiograph of the maxillary right lateral incisor.
Notice the severe bone loss. |
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| Periapical
radiograph of the maxillary left lateral incisor showing
severe bone loss. |
Exposure of the symphysis and harvesting of the coritcocancellous
bone cores. |
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| Preparation
of the osteotomy utilizing a 4.3-mm twist drill. |
The
2 bone cores were tapped into the prepared osteotomy site
until stabilization was achieved.
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| Grafted
sites immediately after membrane removal and implant placement.
Notice the restored vertical dimensions of the alveolar
ridge and the favorable position of the implants in relation
to the CEJ of the adjacent teeth. |
Definitive restoration 1 year after loading. |
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| Periapical
radiograph taken after 1 year of loading of the implant
placed in the site of the extracted maxillary right lateral
incisor. |
Periapical
radiograph taken after 1 year of loading of the implant
placed in the site of the extracted maxillary left lateral
incisor. |
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| Key
words: alveolar ridge augmentation, bone cores, dental
implants, mandibular symphysis. |
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Eliaz
Kaufman, DDS, MS
Peter D. Wang, DDS, MS
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Extraido de la revista "The International Journal of ORAL
& MAXILLOFACIAL IMPLANTS" - 2003;18:293-298 |
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