Basic surgical techniques for endosseous implant placement
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Basic Surgical Techniques for Endosseous Implant Placement. Division of Oral and Maxillofacial Surgery University of Minnesota. WHAT IS A DENTAL IMPLANT?. Dental implant is an artificial titanium fixture which is placed surgically into the jaw bone to

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Basic surgical techniques for endosseous implant placement l.jpg
Basic Surgical Techniques for Endosseous Implant Placement

Division of Oral and Maxillofacial Surgery

University of Minnesota


What is a dental implant l.jpg
WHAT IS ADENTAL IMPLANT?

  • Dental implant is an artificial titanium fixture

    which is placed surgically into the jaw bone to

    substitute for a missing tooth and its root(s).


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History of Dental Implants

In 1952, Professor Per-Ingvar Branemark,

a Swedish surgeon, while conducting research

into the healing patterns of bone tissue, accidentally discovered that when pure titanium comes into direct contact with the living bone tissue, the two literally grow together to form a permanent biological adhesion. He named this phenomenon "osseointegration".


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First Implant Design by Branemark

All current implant designs are modifications of this initial design


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Surgical Procedure

STEP 1: INITIAL SURGERY

STEP 2: OSSEOINTEGRATION PERIOD

STEP 3: ABUTMENT CONNECTION

STEP 4: FINAL PROSTHETIC RESTORATION


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Fibro-osseous integration

• Fibroosseous integration

– “tissue to implant contact with dense collagenous tissue between the implant and bone”

• Seen in earlier implant systems.

• Initially good success rates but extremely poor long term success.

• Considered a “failure” by todays standards


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Osseointegration

  • Success Rates >90%

  • Histologic definition

    • “direct connection between living bone and load-bearing endosseous implants at the light microscopic level.”

  • 4 factors that influence:

    Biocompatible material

    Implant adapted to prepared site

    Atraumatic surgery

    Undisturbed healing phase


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Soft-tissue to implant interface

  • Successful implants have an

    • Unbroken, perimucosal seal between the soft tissue and the implant abutment surface.

  • Connect similarly to natural teeth-some differences.

    • Epithelium attaches to surface of titanium much like a natural tooth through a basal lamina and the formation of hemidesmosomes.


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Soft-tissue to implant interface

  • Connection differs at the connective tissue level.

    • Natural tooth Sharpies fibers extent from the bundle bone of the lamina dura and insert into the cementum of the tooth root surface

    • Implant: No Cementum or Fiber insertion.

      Hence the Epithelial surface attachment is IMPORTANT






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The “Parts”

  • Implant body-fixture

  • Abutment (gingival/temporary healing vs. final)

  • Prosthetics




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Team Approach

  • A surgical – prosthodontic consultation is done prior to implant placement to address:

    • soft-tissue management

    • surgical sequence

    • healing time

    • need for ridge and soft-tissue augmentation


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Clinical Assessment

  • Assess the CC and Expectations

  • Review all restorative options:

    • Risks and Benefits

  • Select option that meets functional and esthetic requirements


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Patient Evaluation

  • Medical history

    • vascular disease

    • immunodeficiency

    • diabetes mellitus

    • tobacco use

    • bisphosphonate use


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History of Implant Site

  • Factors regarding loss of tooth being replaced

    • When?

    • How?

    • Why?

  • Factors that may affect hard and soft tissues:

    • Traumatic injuries

    • Failed endodontic procedures

    • Periodontal disease

  • Clinical exam may identify ridge deficiencies


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Surgical Phase- Treatment Planning

  • Evaluation of Implant Site

  • Radiographic Evaluation

  • Bone Height, Bone Width and Anatomic considerations


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Basic Principles

  • Soft/ hard tissue graft bed

  • Existing occlusion/ dentition

  • Simultaneous vs. delayed reconstruction


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Smile Line

  • One of the most influencing factors of any prosthodontic restoration

  • If no gingival shows then the soft tissue quality, quantity and contours are less important

  • Patient counseling on treatment expectations is critical


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Anatomic Considerations

  • Ridge relationship

  • Attached tissue

  • Interarch clearance

  • Inferior alveolar nerve

  • Maxillary sinus

  • Floor of nose


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Radiological/Imaging Studies

  • Periapical radiographs

  • Panoramic radiograph

  • Site specific tomograms

  • CAT scan (Denta-scan, cone beam CT)


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Width of Space and Diameter of Implant

Attention must be paid to both the coronal and interradicular spaces


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A case against routine CT

  • Expense

  • Time consuming process

  • Use of radiographic template/proper fit requires DDS present

  • Contemporary panoramic units have tomographic capabilities

  • Usually adds no additional data over standard database




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Dental Implant Surgery Phase I

  • Aseptic technique

  • Minimal heat generation

    • slow sharp drills

    • internal irrigation?

    • external cooling


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Dental Implant Surgery Phase I

  • Adequate time for integration

  • Adequate recipient site

    • soft tissue

    • bone

  • Kind & Gentle technique


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Disposition

1. Chlorhexidine

2. Analgesics

+/- antibiotics





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Limitations to Implant placement in the Maxilla

  • Ridge width

  • Ridge height

  • Bone quality



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Summers, RB. A New concept in Maxillary Implant Surgery: The Osteotome technique. Compendium. 15(2): 152, 154-6

  • Ridge expansion technique

    • 3-4 mm of crestal alveolar width required

  • Sinus floor elevation technique

    • 8-9 mm of alveolar bone height required in order to place a 13 mm implant

      (4-5 mm sinus floor elevation)


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Introduction The Osteotome technique. Ridge expansion technique

  • 1.6 mm pilot hole

  • Summers osteotome # 1-4

    • sequenced tapered osteotomes.

    • ridge expansion (displacement) versus bone removal.

  • Final drill coincident with the final implant size (sometimes not necessary)


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Introduction The Osteotome technique. Sinus floor elevation technique

  • 1.6 mm pilot hole

  • Summers osteotome # 1-4

    • Sinus floor microfractured superiorly

    • Sinus floor can be elevated 4-5 mm

    • May backfill with bone allograft/alloplast

  • Final drill coincident with final implant size


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Surgical Technique The Osteotome technique.


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A. Rake, K. Andreasen, S. Rake, J. Swift The Osteotome technique. A Retrospective Analysis of Osteointegration in the Maxilla Utilizing an Osteotome Technique versus a Sequential Drilling Technique, 1999 AAOMS Abstract

  • 155 maxillary implants in 84 patients restored for at least 6 months

    • 57 were placed utilizing the osteotome technique

    • 98 were placed utilizing the drilling technique

  • One implant failed of the 98 in the drill group

  • None of the implants had failed of the 57 in the osteotome group


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Stage II Surgery Preoperative Considerations The Osteotome technique.

  • 3-6 months after stage I


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Stage II Surgery Preoperative Considerations The Osteotome technique.

  • Done under local anesthesia

  • Pre-op medications

    • Chlorhexidine rinse


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Placement of healing abutment The Osteotome technique.


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conclusions The Osteotome technique.

  • The failing implant is very difficult to treat

  • Traumatic surgical manipulation with initial instability of implant increases risk of failure

  • Implant success is only as good as the prosthodontic reconstruction


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