A dental implant is an artificial tooth root replacement
and is used in prosthetic dentistry to support restorations
that resemble a tooth or group of teeth. There are several
types of dental implants. The major classifications are
divided into osseointegrated implant and the fibrointegrated
implant.
|
DENTAL IMPLANTS
What
are Dental Implants?
The dental implants are small posts made of titanium
or titanium alloy which are inserted into the jawbone
to replace the missing teeth. These metal anchors
act as tooth root substitutes. They are surgically
placed into the jawbone, where the implant becomes
directly attached to vital bone, creating a strong
foundation for artificial teeth. Small posts are then
attached to the implant which protrude through the
gums.
These posts provide stable anchors for artificial
replacement teeth. Dental implants are highly successful
and help in preserving facial structure, and preventing
the bone loss that occurs when teeth are missing.
They give the person who lost natural teeth the ability
to chew again with confidence.
Anatomy
of a Dental Implant
A dental implant designed to replace a single
tooth is composed of three parts: the titanium implant
that fuses with the jawbone; the abutment, which fits
over the portion of the implant that protrudes from
the gum line; and the crown, which is created by a
prosthodontist or restorative dentist and fitted onto
the abutment for a natural appearance.
Did you know that dental implants are frequently
the best treatment option for replacing missing teeth?
Rather than resting on the gum line like removable
dentures, or using adjacent teeth as anchors like
fixed bridges, dental implants are long-term replacements
that your oral and maxillofacial surgeon surgically
places in the jawbone.
Statistics show that 69% of adults ages 35 to 44 have
lost at least one permanent tooth to an accident,
gum disease, a failed root canal or tooth decay. Furthermore,
by age 74, 26% of adults have lost all of their permanent
teeth.
|
|
Many
people who are missing a single tooth opt for a fixed bridge;
but a bridge may require the cutting down of healthy, adjacent
teeth that may or may not need to be restored in the future.
Then there is the additional cost of possibly having to
replace the bridge once, twice or more over the course of
a lifetime. Similarly, a removable partial denture may contribute
to the loss of adjacent teeth. Studies show that within
five to seven years there is a failure rate of up to 30%
in teeth located next to a fixed bridge or removable partial
denture.
Dental
implants are designed to provide a foundation for replacement
teeth that look, feel, and function like natural teeth.
The person who has lost teeth regains the ability to eat
virtually anything and can smile with confidence, knowing
that teeth appear natural and that facial contours will
be preserved. The implants themselves are tiny titanium
posts that are placed into the jawbone where teeth are missing.
The bone bonds with the titanium, creating a strong foundation
for artificial teeth. In addition, implants can help preserve
facial structure, preventing the bone deterioration that
occurs when teeth are missing. Dental implants are
changing the way people live! With them, people are
rediscovering the comfort and confidence to eat, speak,
laugh and enjoy life.
How
Dental Implants Work- Dental implants are metal
anchors, which act as tooth root substitutes. They are surgically
placed into the jawbone. Small posts are then attached to
the implant, which protrude through the gums. These posts
provide stable anchors for artificial replacement teeth.
For most patients, the placement of dental implants involves
two surgical procedures. First, implants are placed within
your jawbone. For the first three to six months following
surgery, the implants are beneath the surface of the gums
gradually bonding with the jawbone. You should be able to
wear temporary dentures and eat a soft diet during this
time. At the same time, your restorative dentist designs
the final bridgework or denture, which will ultimately improve
both function and aesthetics.
After the implant has bonded to the jawbone, the second
phase begins. Your implant surgeon will uncover the implants
and attach a small healing collar. Then your doctor will
be able to begin making your new teeth. An impression must
be taken. Then posts or attachments can be connected to
the implants. The teeth replacements are then made over
the posts or attachments. The entire procedure usually takes
six to eight months. Most patients do not experience any
disruption in their daily life.
There
are various different implants on the market and each one
has its advantages. Please find listed below some that we
use:
New
NobelActive™ - from Nobel Biocare
implants is a 3rd generation implant design. A breakthrough
implant design with revolutionary bone-condensing
capability. NobelActive™ offers unique advantages
and is clinically documented 98% success rate
* potentially fewer drilling protocol steps, depending
on bone density and quantity.
* Minimal osteotomy with minor trauma to bone and
surrounding tissues
* extremely high stability in fresh extraction sites
and sites with thin sinus floors
* ability to change direction during surgery gives
full flexibility for optimal placement
* a narrow neck designed to preserve marginal bone
* grooves on threads and scientifically proven TiUnite™
surface
|
|
|
|
Straumann
product
Reliable. Simple. Versatile. With more
than 20 years of clinical research that have resulted
in over 3,000 independent scientific publications, we
offer the most extensively documented, clinically validated
and practice-proven implant system in the market.ads
and scientifically proven TiUnite™ surface
Reliable
* Implants designed for optimal tissue response
* Reduced healing time
* Morse taper connection for maximum stability
Simple
* A logical component structure
* Procedures that are easy to learn
* One surgical kit
Versatile
* Successful outcomes with any indication
* Free choice of surgical procedure
* A wide range of prosthetic options |
|
|
|
BIOMENT
3i
The Revolutionary NanoTite™ Implant –
A Bone Bonding™ Surface.
Preclinical Studies Demonstrate A Substantial Improvement
On The Rate And Extent Of Osseointegration For The NanoTite
Implant Versus The OSSEOTITE Implant Leading To Implant
Stability 12
Synergy Of The OSSEOTITE® Surface And Discrete Crystalline
Deposition Of Calcium Phosphate (CaP) – More Complex
Topography And The Biologic Benefits Of Cap |
|
|
|
Branemark
The Revolutionary NanoTite™ Implant –
A Bone Bonding™ Surface.
Branemark adheres to the principles of Osseointegration,
a term founded by Professor Per-Ingvar Brånemark after
his important breakthrough in the 1950s when he discovered
that bone can integrate with titanium components. Professor
Brånemark named his discovery from the Latin word os
– which means bone, and integrate – which
means make whole, which can also be expressed as interactive
coexistence.
We have developed bone grafting techniques that allow
us to build bone where the original quantity is insufficient
for fixture placement. But as grafting is a rather invasive
procedure, we have also developed a technique for placing
fixtures in the zygomatic cheek bone, which in many
cases eliminates the need for grafting also in the severely
resorbed maxilla. Another exciting development involves
a procedure we call Brånemark Novum®. It eliminates
the discomfort that can occur during a long healing
period and the problems associated with a removable
denture. Instead the fixtures are inserted in the morning
and the final prosthesis is anchored in the afternoon.
The patient can eat lighter food already at the end
of the first treatment day. In addition, the new procedure
costs significantly less than what is customary for
restoring a completely edentulous mandible. |
|
|
|
Impladent
The Revolutionary Features of Bone Compaction
by LaminOss® Taps - Bone compaction and minimal
bone loss are achieved by the unique compound angles
of the surgical taps that provide a simultaneous, progressive
internal cutting edge, followed by the outer flat compressive
surface area of the tap at the time of bone threading
procedures.
Impladent Ltd.develops, manufactures, and distributes
a broad range of innovative synthetic bioactive resorbable
bone products, osteocompressive immediate-load dental
implants, chairside prosthetic modalities for immediate
implant splinting and reconstruction, and a line of
surgical motors and hand pieces. For over 17 years,
Impladent Ltd. has been recognized as a leader in the
innovation and development of synthetic resorbable bone
grafts, osteocompressive immediate-load dental implants. |
 |
History
of Dental Implants
The Mayan civilization has been shown to have used the earliest
known examples of endosseous implants (implants embedded
into bone), dating back over 1,350 years before Per Brånemark
started working with titanium. While excavating Mayan burial
sites in Honduras in 1931, archaeologists found a fragment
of mandible of Mayan origin, dating from about 600 AD. This
mandible, which is considered to be that of a woman in her
twenties, had three tooth-shaped pieces of shell placed
into the sockets of three missing lower incisor teeth. For
forty years the archaeological world considered that these
shells were placed under the nose in a manner also observed
in the ancient Egyptians. However, in 1970 a Brazilian dental
academic, Professor Amadeo Bobbio studied the mandibular
specimen and took a series of radiographs. He noted compact
bone formation around two of the implants which led him
to conclude that the implants were placed during life.
In the
1950s research was being conducted at Cambridge University
in England to study blood flow in vivo. These workers devised
a method of constructing a chamber of titanium which was
then embedded into the soft tissue of the ears of rabbits.
In 1952 the Swedish orthopaedic surgeon, P I Brånemark,
was interested in studying bone healing and regeneration,
and adopted the Cambridge designed ‘rabbit ear chamber’
for use in the rabbit femur. Following several months of
study he attempted to retrieve these expensive chambers
from the rabbits and found that he was unable to remove
them. Per Brånemark observed that bone had grown into such
close proximity with the titanium that it effectively adhered
to the metal. Brånemark carried out many further studies
into this phenomenon, using both animal and human subjects,
which all confirmed this unique property of titanium.
Although
he had originally considered that the first work should
centre on knee and hip surgery, Brånemark finally decided
that the mouth was more accessible for continued clinical
observations and the high rate of edentulism in the general
population offered more subjects for widespread study. He
termed the clinically observed adherence of bone with titanium
as ‘osseointegration’. In 1965 Brånemark, who was by then
the Professor of Anatomy at Gothenburg University in Sweden,
placed the first titanium dental implant into a human volunteer,
a Swede named Gösta Larsson.
Over
the next fourteen years Brånemark published many studies
on the use of titanium in dental implantology until in 1978
he entered into a commercial partnership with the Swedish
defense company, Bofors AB for the development and marketing
of his dental implants. With Bofors (later to become Nobel
Industries) as the parent company, Nobelpharma AB (later
to be renamed Nobel Biocare) was founded in 1981 to focus
on dental implantology. To the present day over 7 million
Brånemark System implants have now been placed and hundreds
of other companies produce dental implants. All dental implants
currently available are axilly symmetric (cylindrical form)
and do not fit precisely in the individual tooth socket.
For this reason additional risky and costly interventions
are regularly required to fill the gaps between the implant
and bone.
The
latest development in immediate dental implantology are
root analogue Zirconia implants, which fit exactly into
the extraction socket, rendering additional procedures such
as bone transplantation or implantation of bone substitute
as well as drilling absolutely unnecessary.
Dental
Implant Procedure
A typical
implant consists of a titanium screw (resembling a tooth
root) with a roughened or smooth surface. The very first
implants were made out of commercially pure titanium, however
since it was discovered that the TiAl6V4 alloy offered the
same osseointegration level as commercially pure titanium,
more and more implants were made out of TiAl6V4 alloy due
to its better tensile strength and thus fracture resistance.
Today most implants are made out of the TiAl6V4 alloy and
treated either by plasma spraying, etching or sandblasting
to increase the surface area and, thus the integration potential
of the implant. An osteotomy or precision hole is carefully
drilled into jawbone and the implant is installed in the
osteotomy.
Implant
surgery is typically performed as an outpatient under general
anesthesia or with local anesthesia by trained and certified
clinicians including general dentists, oral surgeons, and
periodontists. An increasing number of general or cosmetic
dentists as well as prosthodontists are also placing implants
in relatively simple cases. The most common treatment plan
calls for several surgeries over a period of months, especially
if bone augmentation (bone grafting) is needed to support
implant placements. At the other end of the surgery scale,
some patients can be implanted and restored in a single
surgery, in a procedure labeled "immediate function" and
"teeth in an hour."
A single
implant procedure that involves an incision and "flapping"
of the gum or gingiva (to expose the jawbone) takes about
an hour, sometimes longer; multiple implants can be installed
in a single surgical session lasting several hours. At the
conclusion, the patient goes through a period of recovery,
returns to consciousness and is sent home with a relative
or friend.
Healing
and integration of the implant(s) with jawbone occurs over
several months in a process called osseointegration. At
the appropriate time, the restorative or cosmetic dentist
or prosthodontist uses the implant(s) to anchor crowns or
a prosthetic restoration containing several "teeth". Since
the implants supporting the restoration are integrated,
which means they are biomechanically stable and strong,
the patient is immediately able to masticate (chew) normally.
In an
immediate function procedure, the gingiva is not flapped
(Flapless). Instead, the surgeon removes a small plug of
gingiva directly over the drilling site. The site is drilled
and the implant is installed. Then a crown is immediately
added. Patients are cautioned to give their new "teeth in
an hour" ample healing/integration time (weeks or months)
before attempting normal mastication.
There
are different approaches to place dental implants after
tooth extraction. The approaches are:
1. Immediate post-extraction implant placement.
2. Delayed immediate post-extraction implant placement (2
weeks to 3 months after extraction).
3. Late implantation (3 months after tooth extraction).
According
to the timing of loading of dental implants, the procedure
of loading could be classified into:
1. Immediate loading procedure.
2. Early loading (1 week to 12 weeks).
3. Staged loading (3-6 months).
4. Late loading (more than 6 months).
Most
patients need the longer treatment plan, which has an excellent
history going back many years. Before surgery, with the
patient fully awake or during an earlier office visit, a
prudent clinician planning mandibular implants will conduct
a neurosensory examination to rule out altered sensation,
thus setting a base line on nerve function. Also prior to
surgery, a panoramic X-ray will be taken using a metal ball
of known dimension so that calibrated measurements can be
made from the image (to accurately locate "vital structures"
such as nerves and the position of critical anatomical features
such as the mental foramen, which is the transit point in
the jawbone for the nerve which innervates the lip and chin).
At edentulous
(without teeth) jaw sites, a pilot hole is bored into the
recipient bone, taking care to avoid vital structures (in
particular the inferior alveolar nerve or IAN within the
mandible). A zone of safety, usually 2 mm, is the standard
of care for avoiding vital structures like the IAN. When
computed tomography (3D X-ray imaging) is used preoperatively
to accurately pinpoint vital structures, the zone of safety
may be reduced to 1 mm through the use of computer-aided
design of surgical guides.
Drilling
into jawbone usually occurs in several separate steps. The
pilot hole is expanded by using progressively wider drills
(typically between three and seven successive drilling steps,
depending on implant width and length). Care is taken not
to damage the osteoblast or bone cells by overheating. A
cooling saline spray keeps the temperature of the bone to
below 47 degrees Celsius (approximately 117 degrees Fahrenheit).
The implant screw can be self-tapping, and is screwed into
place at a precise torque so as not to overload the surrounding
bone (overloaded bone can die, a condition called osteonecrosis,
which may lead to failure of the implant to fully integrate
or bond with the jawbone). Typically in most implant systems,
the osteotomy or drilled hole is about 1mm deeper than the
implant being placed, due to the shape of the drill tip.
Surgeons must take the added length into consideration when
drilling in the vicinity of vital structures.
Once
properly torqued into the bone, a cover screw is placed
on the implant, then the gingiva or gum is sutured over
the site and allowed to heal for several months for osseointegration
to occur between the titanium surface of the implant and
jawbone.
After
several months the implant is uncovered in another surgical
procedure, usually under local anesthetic by the restorative
dentist or prosthodontist, and a healing abutment and temporary
crown is placed onto the implant. This encourages the gum
to grow in the right scalloped shape to approximate a natural
tooth's gums and allows assessment of the final aesthetics
of the restored tooth. Once this has occurred a permanent
crown will be fabricated and placed on the implant.
An increasingly
common strategy to preserve bone and reduce treatment times
includes the placement of a dental implant into a recent
extraction site. In addition, immediate loading is becoming
more common as success rates for this procedure are now
acceptable. This can cut months off the treatment time and
in some cases a prosthetic tooth can be attached to the
implants at the same time as the surgery to place the dental
implants.
In all
of these approaches, computer-based guidance has thrust
itself onto the treatment stage. Not only will 3D digital
imagery yield critical treatment guidance, the digital data
can be used to manufacture precision drilling guides, virtually
eliminating surgical errors.
Complementary
procedures
Sinus
lifting is a common surgical intervention. The trained
general dentist, oral surgeon, or periodontist thickens
the inadequate part of atrophic maxilla towards the sinus
with the help of bone transplantation or bone expletive
substance and as a result creates a better quality bone
site for the implantation.
Bone
grafting will be necessary in cases where there is a
lack of adequate maxillary or mandibular bone in terms of
front to back (lip to tongue) depth or thickness; top to
bottom height; and left to right width. Sufficient bone
is needed in three dimensions to securely integrate with
the root-like implant. Improved bone height -- which is
very difficult to achieve -- is particularly important to
assure ample anchorage of the implant's root-like shape
because it has to support the mechanical stress of chewing,
just like a natural tooth. If an implant is too shallow,
chewing may cause a dangerous jawbone crack or full fracture.
Typically,
implantologists try to place implants at least as deeply
into bone as the crown or tooth will be above the bone.
This is called a 1:1 crown to root ratio. This ratio establishes
the target for bone grafting in most cases. If 1:1 or better
cannot be achieved, the patient is usually advised that
only a short implant can be placed and to not expect a long
period of usability.
A wide
range of grafting materials and substances may be used during
the process of bone grafting / bone replacement. They include
the patient's own bone (autograft), which may be harvested
from the hip (iliac crest) or from spare jawbone; processed
bone from cadavers (allograft); bovine bone or coral (xenograft);
or artificially produced bonelike substances (calcium sulfate
with names like Regeneform; and hydroxyapatite or HA, which
is the primary form of calcium found in bone). The HA is
effective as a substrate for osteoblasts to grow on. Some
implants are coated with HA for this reason.
Bone
graft surgery has its own standard of care. In a typical
procedure, the clinician creates a large flap of the gingiva
or gum to fully expose the jawbone at the graft site, performs
one or several types of block and onlay grafts in and on
existing bone, then installs a membrane designed to repel
unwanted infection-causing microbiota found in the oral
cavity. Then the gingiva is carefully sutured over the site.
Together with a course of internal antibiotics and external
antibiotic mouth rinses, the graft site is allowed to heal
(several months).
The
clinician typically takes a new panoramic x-ray to confirm
graft success in width and height, and assumes that positive
signs in these two dimensions safely predicts success in
the third dimension, depth. Where more precision is needed,
usually when mandibular implants are being planned, a 3D
or cone beam X-ray may be called for at this point to enable
accurate measurement of bone and location of nerves and
vital structures for proper treatment planning. The same
X-ray data set can be employed for the preparation of computer-designed
placement guides.
Correctly
performed, a bone graft produces live vascular bone which
is very much like natural jawbone and is therefore suitable
as a foundation for implants.
Considerations
For
dental implant procedure to work, there must be enough bone
in the jaw, and the bone has to be strong enough to hold
and support the implant. If there is not enough bone, more
may need to be added with a bone graft procedure discussed
earlier. Sometimes, this procedure is called bone augmentation.
In addition, natural teeth and supporting tissues near where
the implant will be placed must be in good health.
In all
cases, what must be addressed is the functional aspect of
the final implant restoration, the final occlusion. How
much force per area is being placed on the bone implant
interface? Implant loads from chewing and parafunction can
exceed the physio biomechanic tolerance of the implant bone
interface and/or the titanium material itself, causing failure.
This can be failure of the implant itself (fracture) or
bone loss, a "melting" or resorption of the surrounding
bone.
The
restorative dentist must first determine what type of prosthesis
will be fabricated. Only then can the specific implant requirements
including number, length, diameter, and thread pattern be
determined. In other words, the case must be reverse engineered
by the restoring dentist prior to the surgery. If bone volume
or density is inadequate, a bone graft procedure must be
considered first. The restoring dentist consults with the
oral surgeon, trained general dentist, or periodontist to
co-treat the patient. Usually, physical models or impressions
of the patient's jawbones and teeth are made by the restorative
dentist at the surgeon's request, and are used as physical
aids to treatment planning. If not supplied, the surgeon
makes his own or relies upon advanced computer-assisted
tomography or a cone beam CAT scan to achieve the proper
treatment plan.
Computer
simulation software based on CAT scan data allows virtual
implant surgical placement based on a barium impregnated
prototype of the final prosthesis. This predicts vital anatomy,
bone quality, implant characteristics, the need for bone
grafting, and maximizing the implant bone surface area for
the treatment case creating a high level of predictability.
Computer CAD/CAM milled or stereo lithography based drill
guides can be developed for the implant surgeon to facilitate
proper implant placement based on the final prosthesis occlusion
and aesthetics.
Treatment
planning software can also be used to demonstrate "try-ins"
to the patient on a computer screen. Software products like
Materialise' SimPlant (simulated implant) use the digital
data from a CAT scan (such as an iCAT or a NewTom) to provide
extremely accurate simulations that are easily understood
by patients. When options have been fully discussed between
patient and surgeon, the same software can be used to produce
precision drill guides.
Success
rates
Dental
implant success is related to operator skill, quality and
quantity of the bone available at the site, and also to
the patient's oral hygiene. Various studies have found the
10 year success rate of implants to be between 90 and 95%.
Patients who smoke experience significantly poorer success
rates.
Failure
Failure
of a dental implant is often related to failure to osseointegrate
correctly. A dental implant is considered to be a failure
if it is lost, mobile or shows peri-implant (after implant)
bone loss of greater than 1.0 mm in the first year and greater
than 0.2mm a year thereafter.
Dental
implants are not susceptible to dental caries but they can
develop a periodontal condition called peri-implantitis.
The cause may be infection that was introduced during surgery;
or failure by the patient to follow correct oral hygiene
routines. In either case, inflammation in the bone surrounding
the implant causes bone loss (recession) which ultimately
may lead to failure, often evidenced by the ability to "spin"
an implant.
Peri-implantitis
is often dealt with pre-emptively by clinicians who prescribe
a course of antibiotics in the days prior to surgery; and
post-surgically with another course of antibiotics and special
oral rinses. Since peri-implantitis is generally easy to
see on standard panoramic and periapical X-rays, prudent
clinicians who suspect the problem will take an X-ray soon
after surgery, and again at staged intervals post-operatively.
Risk
of failure is increased in smokers. For this reason implants
are frequently placed only after a patient has stopped smoking
as the treatment is very expensive. More rarely, an implant
may fail because of poor positioning at the time of surgery,
or may be overloaded initially causing failure to integrate.
If smoking and positioning problems exist prior to implant
surgery, clinicians often advise patients that a bridge
or partial denture rather than an implant may be a better
solution.
Cost
Price
in the United States, implants average around $1,500 per
tooth, in addition to the cost of the crown which would
then come out to around 4,000 in total(and abutment). The
cost of full mouth reconstructions with implants begin around
$12000 per arch, and can approach $50000, depending on the
complexity of the case.
5
Things You Need to Know About Dental Implants
1.
Fill a Gap With a Dental Implant If you lost a tooth
and aren't ready for a bridge or the tooth is in the back
of the mouth and a bridge is not a viable solution, then
a dental implant may be just what the dentist ordered. Dental
implants are a form of cosmetic dentistry that uses a prosthesis.
A metal screw inserted into the jawbone forms an anchor
to which the prosthetic tooth attaches.
2.
Most People Qualify Patients with missing teeth whose
health is relatively good are candidates for a dental implant.
At one time, lack of bone in the jaw stopped the procedure.
Today, bone grafts create the additional bone necessary.
Even if you have none of your teeth, you are still a candidate
for dental implants, although most of the time they replace
bridges or a partial.
3.
Location, Location, Location Just like real estate,
the location of the implant affects the rate of success.
Implants in the front don't receive the abuse that the back
teeth receive and they have a high success rate, between
90 to 100 percent. The teeth in the back portion of the
mouth have a lower rate of success primarily due to the
heavy workout and difficulty cleaning the area. Smokers
have a lower rate of successful implants than non-smokers.
Children are not candidates except in very specific situations.
4.
Problems Do Occur The area of the implant may not grow
in and hold the screw. Just as a normal tooth, the implant
area is subject to periodontal disease if not kept clean.
Infection of the area and the surrounding bone is a possibility.
There is a small possibility of damage to the jaw or sinus
cavitities. An break or loosening is possible for an implant,
just like a crown. A strong bite and bruxism create problems
with the dental implant. Many oral and maxillofacial surgeons
recommend smoking cessation to insure a better result with
dental implants.
5.
The Good News New coatings for the titanium screw stimulate
bone regeneration. Some of the research shows this is far
superior to previous plain metal. Dental implants remain
in place much better than bridges or dentures. They resemble
regular teeth and usually are undetectable. Implants fit
into the longer life span that Americans enjoy. The implants
are still relatively pricey and may be as much as $2000
or more for a single tooth. Check with a dentist that specializes
in this area to get the best results.
