Journal of Oral Implantology October 2013 - (Page 615)
CASE REPORT
Two-Stage Bone Expansion Technique Using SpearShaped Implants Associated With Overlapped Flap: A
Case Report
Luiz Carlos Magno Filho, DDS1*
Fernando Hayashi1
Alexandre Conte1
Hsu Shao Feng1
´
Marcio Zaffalon Casati1,2
Fabiano Ribeiro Cirano1
The conventional method of ridge expansion uses a mucoperiosteal flap elevation to allow bone corticotomy,
which is followed by bone expansion performed with chisels and bone expanders. To facilitate corticotomy and
avoid flap elevation, bone expansion can be performed in 2 stages. This case report presents a modified 2-stage
bone expansion technique to achieve better implant stabilization and wound closure. This modified approach
may be an efficient procedure for minimizing complications.
Key Words: ridge expansion, two stages surgical procedure, narrow pointed implants
INTRODUCTION
A
fter the loss of a tooth, the alveolar
resorption process begins, which reduces bone volume and could make it
difficult to place implants.1,2 Several
procedures have been developed for
increasing bone volume to overcome these anatomic obstacles. Among these procedures, the use
of block bone grafts, guided bone regeneration,
osteogenic distraction, and bone expansion with
corticotomy (BEC) can be performed.3
In BEC, a complete flap is raised so that
horizontal and vertical osteotomies can be performed. Horizontal osteotomy is performed in the
center of the ridge in the mesiodistal direction and
vertical osteotomies via the vestibular approach,
mesially and distally to the areas where the implants
1
˜
Department of Implant Dentistry, Paulista University, Sao
Paulo, Brazil.
2
Department of Implant Dentistry, State University of Campinas,
˜
Sao Paulo, Brazil.
* Corresponding author, e-mail: lulamagno@ig.com.br
DOI: 10.1563/AAID-JOI-D-11-00038
will be placed. After the osteotomies, the bone is
expanded by means of greenstick fracture, which is
accomplished by introducing chisels and expanders
in the osteotomy performed in the center of the
ridge. After expansion, a gap forms between the
vestibular and lingual bone plates in which one or
more implants are immediately placed. The space
between the plates is filled with a blood coagulum,
presenting a repair process very similar to that
which occurs in immediate implants.4
The BEC presents very drastic technical problems
that may make the procedure difficult or even
unfeasible. The first and most severe is that at the
moment of expansion or implant placement,
instead of a greenstick fracture occurring, the bone
plates and their bone bases could rupture completely. This loosening prevents implants from
being placed and can cause a more severe bone
defect due to resorption, infection, or sequestration
of the bone fragment. Another problem is how to
achieve primary stability of the implants as anchorage is obtained in the most apical portion of the
bone6 and conventional implants have points that
Journal of Oral Implantology
615
Table of Contents for the Digital Edition of Journal of Oral Implantology October 2013
Food and Drug Administration: Reclassification of Blade Form Dental Implants
Optimizing Platelet-Rich Plasma Gel Formation by Varying Time and Gravitational Forces During Centrifugation
Effect of Surface Roughness and Low-Level Laser Therapy on Removal Torque of Implants Placed in Rat Femurs
Impression Techniques for Multiple Implants: A Photoelastic Analysis. Part I: Comparison of Three Direct Methods
Impression Techniques for Multiple Implants: A Photoelastic Analysis. Part II: Comparison of Four Acrylic Resins
A Pig Model for the Histomorphometric Evaluation of Hard Tissue Around Dental Implants
In Situ Tooth Replica Custom Implant: A 3-Dimensional Finite Element Stress and Strain Analysis
Influence of Different Soft Liners on Stress Distribution in Peri-Implant Bone Tissue During Healing Period. A 3D Finite Element Analysis
Influence of Surface Nano-Roughness on Osseointegration of Zirconia Implants in Rabbit Femur Heads Using Selective Infiltration Etching Technique
Modified Titanium Surfaces Alter Osteogenic Differentiation: A Comparative Microarray- Based Analysis of Human Mesenchymal Cell Response to Commercial Titanium Surfaces
Hemorrhage Secondary to Interforaminal Implant Surgery: Anatomical Considerations and Report of a Case
Rehabilitation of a Patient With Mandibular Resection Using Osteointegrated Implants: A Case Report
Two-Stage Bone Expansion Technique Using Spear-Shaped Implants Associated With Overlapped Flap: A Case Report
Implant Esthetic Restoration in Ridge Deficiencies in Cases of Trauma: A Case Report
Rehabilitation of the Atrophic Maxilla With Tilted Implants: Review of the Literature
Journal of Oral Implantology October 2013
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