041.
Dental therapist
DR. MAJED
AL MUNIF
Saudi Dental Journal
2007;19(SI)-Abstr.041
042.
Role of hydroxylapatite
mixed with autogenous chin bone in secondary grafting of alveolar clefts
Dr. MOHAMMED A. EL SHALL*, Prof. ABDELFATTAH
A. SADAKAH**, Prof. SEHAM A. EMARA**, Dr. ABDELHAMEED M. SHERIF***
*Assistant
Professor, Oral and Maxillofacial Surgery, College
of Dentistry, King
Saud University, Saudi Arabia,
**Professor, Oral and Maxillofacial Surgery, ***Assistant Professor, Oral and
Maxillofacial Surgery, Faculty of Dentistry, Tanta University, Egypt
Objective:
This study was planned in order to investigate the validity of using the
hydroxylapatite (HA) mixed with autogenous bone harvested from the chin region,
in secondary alveolar cleft grafting, aiming to utilize the well-accepted
advantages of the chin bone in secondary grafting procedures and in the same
time overcoming its limitation of use in wide unilateral and the bilateral
alveolar clefts.
Patients and Methods: The study was designed to have two groups, according to the
type of the graft material used, in the mixed dentition period (7-12 years).
Group I: comprised 12 children in whom
alveolar clefts were closed using hydroxylapatite (OsteoGraf / LD-Low Density)
mixed with autogenous chin bone.
Group II: comprised 12 children in whom
alveolar clefts were closed using only autogenous chin bone. For evaluation of the
grafting outcome, a clinical, study cast, and radiological assessment for all
the cases were done pre- and post-operatively.
Results:
The results of this study demonstrated that, there was no any significant
difference which could affect the success rate of the grafting outcomes between
the mixtures of HA and chin bone graft used in Group I cases and the patients
grafted with the chin bone alone in Group II.
Conclusion: The
use of a mixture of HA granules and autogenous chin bone in secondary alveolar
cleft grafting provides a good graft material in all aspects. Therefore, the
use of a mixed graft material (from HA granules and chin bone) is recommended
in bilateral or wide unilateral alveolar cleft grafting at the mixed dentition
period.
Saudi Dental Journal
2007;19(SI)-Abstr.042
043.Osteoprotegerin inhibits periodontal alveolar bone loss in
susceptible animals
Dr. HAMAD A. AL
ZOMAN
Division of Periodontics, Department of Preventive
Dental Sciences, College of Dentistry, King Saud University , Riyadh, Saudi
Arabia
HLA-B27 transgenic (TG) rats, i.e., rats engineered to
express the human antigen HLA-B27, have been shown to experience accelerated
alveolar bone loss (ABL) compared to control (WT) F344 rats. The purpose of this study was to examine the
potential effect of esteoprotegerin (OPG) on both the naturally occurring ABL
in HLA-B27 transgenic (TG) rats and on the possible ovariectomy-induced
ABL. This study was conducted by
utilizing 46 female 7-8 week-old TG rats and 52 age- and sex-matched WT
rats. Half of the TG and WT rats were
ovariectomized (OVX) and half were sham-ovariectomized (SHAM). The animals were then randomized to receive
either vehicle (PBS) or recombinant human osteoprotegerin (rhOPG, Amgen). Twice weekly, rhOPG (5 mg/kg) or PBS was
administered via SC bolus injection and the animals were sacrificed at 6 or 9
months of age. After sacrifice,
defleshed heads were stained to locate the cemento enamel junction (CEJ) and
exposed molar root surface area (mm2) was measured to determine
ABL. Blinded measurements were performed
using a computer-assisted image analysis system. The results of this study have shown that
both OVX and SHAM TG rats experienced greater ABL than corresponding WT
controls (P < 0.0001). Animals sacrificed at 9 months of age had
greater ABL than those sacrificed at 6 months of age (P < 0.001). Administering
rhOPG significantly reduced ABL in both TG and WT rats (P < 0.001). However, OVX
and SHAM animals showed no significant difference in ABL (P > 0.05). Multiple
regression analysis indicated that only strain (TG, WT), age at death, and treatment
(rhOPG, PBS) were significant factors for ABL.
The results of this study are consistent with previous reports of
increased ABL in TG rats. The findings
of this study indicate that ovariectomy does not compound eh ABL observed in
TG- or WT rats. The significant
reduction in ABL by rhOPG suggests that rhOPG and/or other means to inhibit
receptor activator of nuclear factor kappa B (RANK) activation merits further
study as possible treatment modality for inhibition of periodontal bone loss in
humans.
Saudi Dental Journal
2007;19(SI)-Abstr.043
044.
Pedicled buccal fat pad
in treatment of severe gingival recession: A case report
Dr. SALLY A. EL
HADDAD*, Prof. MONA Y. ABD EL RAZZAK***, Dr. MOHAMMAD EL SHALL**
*Registrar,
Oral Medicine, **Assistant Professor, Oral and Maxillofacial Surgery, College of Dentistry,
King Saud University, Saudi
Arabia, ***Professor, Oral Medicine and Periodontology, College of Dentistry,
Tanta University, Egypt
Objective: The sites exhibiting Miller's Class
IV gingival recession are not suitable for treatment with surgical root
coverage techniques and their prognosis are very poor with the present day
techniques. The object of this case report was the innovation of a new
technique to augment the final width of the keratinized mucosa coronal to the
recession by using the pedicled buccal fat pad (BFP).
Method: BFP was mobilized through an
incision at the base of the buccal flap. The vascularized flap was secured to
the buccal surface of the upper first molar tooth and premolar teeth.
Results: Clinically significant amounts
of root coverage were obtained. Epithelialization of the BFP was completed
after 6 weeks with formation of keratinized mucosa in the anatomical site of
the attached gingiva.
Conclusion: The use of BFP technique is
quite simple and easy to handle and is a novel application for augmentation and
coverage of severe gingival recession with replacement of the missed
keratinized tissue. The BFP flap can be mobilized into the desired position
according to the length of the flap which could be extended to the canine tooth
of the same side.
Saudi Dental Journal
2007;19(SI)-Abstr.044
045.
Bone grafting-decision in implant dentistry
DR. FARHAD ATASSI
Associate Professor of Periodontics, Department of
Preventive Dental Sciences, College of Dentistry, King Saud University, Riyadh,
Saudi Arabia
The availability of adequate bone volume for dental
implant placement is often diminished by trauma, pathology, periodontal
disease, and tooth loss. Therefore, the condition of alveolar bone may
influence the success rate and subsequent esthetics of dental implant
placement. To improve this outcome, a variety of grafting materials and
techniques have been developed to prepare a biologically acceptable dental
implant site. Due to the limited availability of autogenous bone, various
grafting materials are now widely used providing scaffolding for bone
regeneration and augmentation for osseous tissue ingrowths.
The successful bone grafting requires an understanding of the biology of the bone, the selection
of the appropriate bone grafting material based on the osteogenic potential of
the recipient site and properties of the material. When the appropriate
surgical technique and graft material are selected for a given defect site, the
original morphology of the site can be regained or even surpassed. However, selection
of an inappropriate surgical technique or graft material, or both, may lead to
resorption of the graft material or failure of it to integrate with the
surrounding tissue. A decision making protocol for achieving a new bone based
on bone growth qualitatively and quantitatively, as well as, the properties of grafting materials will be the
highlight of this presentation.
Saudi Dental Journal
2007;19(SI)-Abstr.045
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