2. Jun chang hun
Edentulism
Once the teeth are lost, a continuous resorptive process
Results
Diminished volume and strength of residual bone
Loss of facial vertical dimension
Impaired masticatory function
Difficulty choosing a balanced diet
Speech difficulty
Facial soft tissue changes
Pathologic fracture possibility
3. Jun chang hun
SITE DEVELOPMENT
Reconstruction of deficient alveolar ridges that lacks
sufficient volume, contour, or height
Ultimate surgical goal
Restore function, form, and long-term stability
Surgical approach selection
Type, size, and shape of the defect
Surgical expertise or experience level of surgeon
Intended direction of the augmentation
4. Jun chang hun
SITE DEVELOPMENT
Hard tissue management
Ridge(socket) preservation
Ridge augmentation
Vertical ridge augmentation
Horizontal ridge augmentation
Soft tissue management
5. Jun chang hun
SITE DEVELOPMENT
Hard tissue management
Ridge(socket) preservation
Ridge augmentation
Vertical ridge augmentation
Horizontal ridge augmentation
Soft tissue management
6. Jun chang hun
Defect size
Small edentulous segments (such as single tooth)
Particulate autogenous bone with membrane
(Fugazzotto 1997)
Large ridge reconstructions
Controversial
(Lang et al 1994, Chiapasco et al 1999)
Autogenous block bone
Extra-oral
Intra-oral
Distraction (>5mm vertical deficiency)
7. Jun chang hun
TMI
Bosker Transmandibular Implant (TMI)
In the late 1970s
Without the need for autologous bone graft
Technique sensitive both surgeon & prosthodontist
Significant “reversible complication” rate
22.2% (Keller et al, Int JOMI 1986;1:101)
Infection, superstructure fx, mandible fx, fail to osseointegrate
8. Jun chang hun
Ridge augmentation methods
Bone grafting
Biomaterials
GBR
Alveolar distraction osteogenesis
9. Jun chang hun
Distraction Osteogenesis
for vertical ridge augmentation
History
1992, McCarthy and coworker
1996, Block & colleager ; dog
1996, Chin & Toth ; DO & Implant
Advantage
No additional surgery involving a harvesting procedure
No limit to lengthening
Simultaneous lengthening of surround soft tissue
Dis-advantage
Long treatment period
Need for suitable distractor
Danger of infection
Ilizarov (1989)
Preservation of blood supply at the corticotomy site
Kojimoto & coworkers (1988)
Preservation of periosteum : distraction
Vestibular incision rather than crestal incision
10. Jun chang hun
Ridge augmentation methods
Bone grafting
Biomaterials
GBR (Guided Bone Regeneration)
Alveolar distraction osteogenesis
11. Jun chang hun
Titanium membrane only
Cornelini (2000)
Ti-memb only, 3mm vertical ridge augmentation
12. Jun chang hun
Simultaneous implant placement and vertical
ridge augmentation with a titanium-reinforced
membrane: A case report
Vertical ridge augmentation with titanium reinforced memb.
2nd surgery : 12 months later
3mm hard tissue augmentation
2mm dense connective tissue covered the newly formed bone
Cornelini R, Cangini F, Covani U, Andreana S (Int JOMI, 2000;15:883-888)
13. Jun chang hun
Ridge augmentation methods
Bone grafting
Biomaterials
GBR
Alveolar distraction osteogenesis
14. Jun chang hun
Autogenous bone graft
Gold standard for bone augmentation procedures
Block bone or particulate forms
Block bone - reduced osteogenic activity & slow
revascularization than particulate bone marrow
Extra-oral or Intra-oral donor-site
Intraoral harvested intramembraneous bone graft may
have minimal resorption, enhanced revascularization,
and better incorporation at the donor site
15. Jun chang hun
Autogenous bone graft
Advantage
Osteogenic potential
Block grafts that maintain form and shape
Ability to correct any size or shape deformity
Elimination of the possibility for an immunogenic reaction
Disadvantage
2nd surgical intervention
Morbidity associated with the donor site
Unpredictable bone resorption
Longer recovery period
Difficulty in managing soft tissue coverage
Increased treatment time
Increased risks
16. Jun chang hun
Autogenous block bone grafts
Width deficiency
Veneer or saddle graft
Most predictable and resistant to resorption
Vertical deficiency
Onlay or saddle graft
Difficult to gain and maintain, high resorption rate
Combined deficiency
17. Jun chang hun
Donor Sites of Autogenous Bone
Cortical Bone
Mandible, Cranium
Cancellous Bone
Mx. Tuberosity
Inner Cancellous part
Cortico-Cancellous Bone
Iliac bone
18. Jun chang hun
Intra-oral vs Extra-oral
Kusiak et al (1985)
Intramembranous bone grafts accelerate revascularization
and healing as compared to endochondral bone grafts
Cortical membranous grafts revascularize more rapidly than
endochondral bone graft with a thicker cancellous part
Zins & Whittacker (1983), Philips & Rhan (1990)
Membranous bone (such as mandible) undergoes less
resorption than endochondral bone (such as iliac crest)
Intraoral harvested intramembraneous bone grafts
Minimal resorption
Enhanced revascularization
Better incorporation at the donor site
23. Jun chang hun
Chin vs Ramus
Complication (chin vs ramus)
Less cosmetic concern
Less wound dehiscence
No gingival recession
Less sensory disturbance
Less discomfort complain
Trismus & edema (medication)
24. Jun chang hun
Parameter Symphysis Ramus
Surgical access Good Fair to good
Cosmetic concern High Low
Graft shape Thick rectangular Thinner rectangular veneer
Graft Size >1cm3 <1cm3
Graft Morphology Corticocancellous Cortical
Graft Resorption Minimal Minimal
Healed Bone Quality Type 2>type 1 Type1>Type2
Post-OP
pain/edema
Moderate Minimal to moderate
Teeth Common(temporary) Uncommon
Nerve damage Common(temporary)
Uncommon
Incision dehiscence Occasional(Vestibular) Uncommon
Chin vs Ramus
25. Jun chang hun
Maxilla vs Mandible
Maxilla
More vascularity
Mandible
Less vascularity
Cortical bone perforation with bur
26. Jun chang hun
Critical Success Factors
Stability of grafting materials
Condition of recipient sites
No infections
Resistance to resorptions
Soft tissue coverage
27. Jun chang hun
Stability of grafting materials
Bony irregularity contouring
Graft fixation
Block bone : at least 2 fixation screws for immobilization
28. Jun chang hun
Condition of recipient sites
Inlay graft (3~4 wall defect)
More favorable
Onlay graft (1~2 wall defect)
More prone to resorption
29. Jun chang hun
Infection
Disrupt the process and halts the growth of new bone
Rupture of the soft tissue closure
Block graft exposure
Exposure time (2002, proussaefs)
Late exposure : no clinical & histologic sign of pathosis or
necrosis
Early exposure : partial or total necrosis
Fixation screw infection
Adjacent teeth(structure) pathologic conditions
30. Jun chang hun
Resistance to resorption
Immobilization
Satisfactory to restore mandibular volume
In function the grafted bone underwent rapid resorption
Onlay graft
Use membranous bone & graft stability
(Philips & Rhan 1990)
Cortical bone
Use of membrane
Adequate implant placement timing
31. Jun chang hun
Soft tissue coverage
Crestal incision with releasing incisions
Lingual flap
Mesially at least 3 teeth include
Raise extending beyond mylohyoid muscle
Tension-free suture
Mattress suture : contact over 3mm
Soft tissue graft
Free graft : FGG, CT
Pedicle graft : palatal or labial
32. Jun chang hun
Controversy
1 stage surgery (bone graft & implant placement)
Single surgical intervention
Potentially reduced healing time
2 stage surgery
Prosthetically better implant placement
Superior esthetics
33. Jun chang hun
1 stage surgery
1 stage surgery (bone graft & implantation)
Long-term implant survival rates : 25~100%
Implant position & angulation are critical factors
Implant survival alone does not predict successful
restoration of occlusion
Verhoeven et al 1997
Carr & Laney 1987
Marx & Morales 1988
34. Jun chang hun
Advantage of delayed implantation
Reducing the infection rate & graft failure rate
Proper angulation & more precise positioning
After 5 years of masticatory functional loading
Onlay grafting & simultaneous implantation in maxilla
Success rate : 51~83%
Secondary implantation
Schliephake et al (1997, JOMS)
20% higher success rate
36. Jun chang hun
Resorption rate
Proussaefs, Lozada et al (2002)
Block graft with Bio-oss : 16.34 %, 17.58 %
Cordaro et al (2002)
Block bone : Mn 41.5%, Mx 43.5% (mean 42%)
Wang and colleagues (1976) : onlay bone graft
During the first 3 years : 14%~100%
Bell et al (2002)
Iliac crest block bone : 33%
37. Jun chang hun
The use of ramus autogenous block grafts for
vertical alveolar ridge augmentation and implant
placement: A pilot study
Ramus block autograft for vertical alveolar ridge augmentation
Ramus block bone, Fixation screws, Periphery : Bio-Oss
4~8 months later : HA implant (Steri-Oss)
Results
Radiographic
6.12 mm (1 month) 5.12 mm (4~6 months) : 16.34 %
Laboratory volumetric
0.91 mL (1 month) 0.75 mL (6 months) : 17.58 %
Peripheral pariculate bone (Bio-Oss)
Bone (34.33%), fibrous tissue (42.17%), residual Bio-Oss particle
(23.50%)
Discussion
Early exposure appeared to compromised the results, while late
exposure did not affect the vitality of the block autografts
Proussaefs P, Lozada J, Kleinman A, Rohrer M (Int JOMI 2002;17:238-248)
38. Jun chang hun
Clinical results of alveolar ridge augmentation with mandibular block bone
grafts in partially edentulous patients prior to implant placement
15 partially edentuous patients
Ramus & symphysis block bone
Fixed with titanium screw
After 6 months screw remove, implant placed
12 months later implant supported fixed bridges
Mean reduction rate
Lateral : 23.5%
Vertical : 42 %
Mandibular site more resorption rate than maxillary sites
Groups
No. of aug.
sites
Lateral aug.
at bone
grafting
Lateral aug.
at implant
placement
%
reduction
of lateral
aug.
Vertical
aug. at
bone
grafting
Vertical
aug. at
implant
placement
%
reduction
of vertical
aug.
Group 1 & 2 18 6.5+0.33 5.0+0.23 23.5% 3.4+0.66 2.2+0.66 42%
Group 1
: Mx
10 6.5+0.6 5.2+0.4 20% 4.75+1.5 2.75+1.5 41.5%
Group 2
: Mn
8 6.5+0.37 4.75+0.12 27.5% 2.4+0.2 1.4+0.2 43.5%
Cordaro L, Amade DS, Cordaro M (Clin oral impl res, 2002;13:103-111)
39. Jun chang hun
Staged reconstruction of the severely atrophic mandible
with autogenous bone graft and endosteal implants
Materials and Methods
Vertical mandibular height <7mm (atrophic mandible)
Iliac crest bone graft to the mandible via an extraoral approach
After 4~6 months, implantation
Results
Mean pre-op bone height : 9mm (midline), 5mm (body)
Before implantation (4~6months) vertical bone loss : 33%
After implantation (24 months)
Non-implant supported region bone loss 11% per year
Implant-supported region bone loss negligible
Conclusions (improve success rates)
Prosthetically sound implant positioning
Provide an affordable reconstructive option
Staged reconstruction
Bell RB, Blakey GH, White RP, Hillebrand DG, Molina A (JOMS, 2002;60:1135-1141)
40. Jun chang hun
Complications of grafting in the atrophic edentulous or
partially edentulous jaw
Intraoperative complications
Bone
Insufficent donor material
Over-reduction
Inadequate fixation
Soft tissue
Perforation
Inability to mobile
Teeth
Root damage
Other anatomy
Sinus : membrane tear
Nerve injury
Postoperative complications
Gerneral
Infection
Bone
Excessive resorption
(early exposure, loss of graft)
Inadequate bone for implant
Soft tissue
Hematoma
Flap retraction
Flap necrosis
Color or tissue-type mismatch
Loss of papilla
Shallowing of vestibule
Teeth
External root resorption
Other anatomy
Sinusities
Nasal bleeding
Oroantral fistula
Bahat O, Fontanesi RV Int JPRD 21:487-495 2001
42. Jun chang hun
Conclusions
Autogenous block bone graft (chin or ramus)
5~7mm gaining
About 30% resorption rate
Staging the grafting and implant procedure
43. Jun chang hun
Primary stability (+)
Exposed threads can be covered with autogenous bone
associated with a membrane
Jovanovic et al (1992), Jovanovic & Buser (1994),
Giovannolli & Renouard (1995), Antoun et al (1996)
Primary stability (-)
Ridge augmentation should be performed before
implantation