| Myung-Rae Kim | 4 Articles |
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[English]
This study was performed to evaluate whether there is the difference of graft height changes in radiographic evaluation in single implants and multiple implants after maxillary sinus floor augmentation with an auto-xenograft mixture. The study group comprised 29 patients (16 men, 13 women; mean age, 56.5±12.4 years; range, 27 to 87 years) treated at the implant clinic of the Ewha Womans University Mokdong Hospital. They were treated with the sinus floor augmentation of lateral window technique and simultaneous placement of dental implants. Their implants have been evaluated for 42.4±10.5 months. To evaluate the height of grafted material, the real implant length was compared with that of panoramic radiography evaluated by a digital caliper (PACS program), and then the real height of grafted material was assumed. SPSS 19.0 was used in statistical analysis. Wilcoxon singed rank test was utilized for P value and Mann-Whitney for statistical significance in the changes of grafted height between single implants and multiple implants. The level of statistical significance was defined as P<0.001. The evaluated graft height in single implants' group decreased to 0.60±0.54 mm at the time of delivery (after 7.5 months, P=0.001), in multi-unit implants' group to 0.96±0.84 mm (after 6.5 months, P<0.001). The evaluated graft height in single implants' group decreased to 1.11±0.75 mm at the last follow-up (after 43.5 months, P=0.001), in multi-unit implants' group to 1.52±0.99 mm (after 41.8 months, P<0.001). Mann-Whitney test was used for the difference between single implants and multi-unit implants. There was no difference in two groups at the time of delivery and the last follow-up (P>0.001). There was no statistical significance of radiographic graft height after maxillary sinus floor augmentation between single implants and multiple implants.
[English]
This study was performed to evaluate the effect of autogenous iliac particulated marrow cancellous bone graft on osseointegration of implants in the dog tibia which has a loose bone marrow. Three mongrel dogs, weighing about15kg or more, and RBM(resorbable blasted media) AVANA® implants(Osstem Inc., Korea) were used in this study. In the control groups, 2 implants sites were prepared conventionally with drills in the left metaphysic of tibia and 2 implants were placed in each dog under general anesthesia. In the experimental groups, 2 implant sites were prepared with drills. and the particulated marrow cancellous bone, which was obtained from the right ilium,was packed into both prepared sites with osteotomes in the right metaphysic of tib-ia in each dog. Two implants were placed. A total of 12 implants were placed in 3 dogs. The animals were sacrificed at 8 weeks after implant placement. The specimens were taken and embedded into the resin. H & E stain was done. The undecalcified specimens were prepared for histological examination and histomorphometric analysis of bone-implant contact ratios. The Mann-Whitney test was used to compare both groups.Values of p<0.01were considered statistically significant. In the cross-sectional radiographs of the control group no trabecular bone was observed in the marrow space and the implant was surrounded with radiolucent marrow space. In the experimental group Some radioaque trabecular bone was observed in the marrow space of tibia and some of the trabecula was contacted with implant surface. Histologically,in the control group few trabecular bone was observed in marrow space and there was poor osseointegration in the marrow. In the experimental group most marrow space was filled with the trabecular boneand the implant surface was contacted with trabecular bone. In histomorphomeric analysis the bone-implant contact ratio of the experimental group(75.6%) was significantly higher than that of the control group(27.1%, p<0.01). The autogeneous bone graft into the loose bone marrow can be an option to improve the bone density and to get better osseointegration of dental implants. Citations Citations to this article as recorded by
[English]
This study was designed to evaluate the ability of the injured trigeminal nerve to regenerate in the bone, and to compare the axonal regeneration following the nerve graft and nerve tubulization with GTR membrane. Fourteen rabbits were divided into 3 groups as follows : not repaired(Gc), Entubulation(G1), and nerve graft(G2) after partial resection of inferior alveolar nerves in the mandibular canals. The neuro-fibrotic tissues regenerated in the nerve gaps were prepared for histomorphologic examination by special staining with Hematoxylin & Eosin, Luxol-fast blue, Bodian's Masson-trichrome. The regenerated axons were examined with Toluidine blue staining and Transmission electronmicroscopy(TEM). The injured mandibular nerve presented a regenerative capacity across 7 cm defect, and tubular repairs with GTAM produced histomorphologic regeneration of neural axons and mini-fascicles in 16 weeks. This investigation, however, showed a finding that autogenous nerve graft was inferior to tubulization in the histomorphologic assessment. The group of nerve graft disclosed less organized neural tissue(mini-fascicles) with more fibrovascular collagenous tissues. Nerve injury resulting a gap which cannot be repaired by primary neurorrhaphy needs grafts or intrpositional tubular nerve guides. The e-PTFE membrane or tube can be used as a good conduit or sheath for nerve regeneration without adhesion of connective tissues, while the grafted nerves in the mandibular and bony ingrowth. Electrophydiologic examination and qualification of the regenerated axons are recommended to evaluate the substantial recovery following the nerve repair modalities.
[English]
Forty one cases(37 patients) of mandibular reconstruction using AO-plates were reviewed. The patients aged from 27 to 83 years o1d(52.3±18.1 years) were followed for 5 to 42 months (mean 12.7±8.3 months). Cases were grouped by the location of reconstruction; Anterior mandible crossing midline as Group A(12 cases), body segment of the mandible as Group B(l6 cases). condyle & ramus of the mandible as Group C(13 cases). The incidence of revision as a measure of outcome was calculated by actuarial methods accounting for loss or death. Revision or plate removal occurred in 22.2% (9 of 41 cases) with an incidence of 52.2% (6 of 12 cases) in Group A, 12.5%(2 of 16 cases) in Group B, and 7.7%(l of 13 cases) in Group C. Combined use of AO-plate and bone graft had a revision rate of 33.3% (4 of 12 cases), while the reconstructions with plate only had a rate of 17.2%(5 of 29 cases). The difference between the immediate reconstructions(19.2% ; 5 of 26 cases) and delayed reconstructions(26.7% ; 4 of 15 cases) was not significent. but the delayed reconstruction of the anterior mandible resulted in highest failure rate of 57.1% (4 of 7 cases). The revision incidence was significantly high when the area had been radiated. 33.3% of 24 radiated cases, while 5.7% of not radiated cases required revision. Particularly, the radiated Group A resulted in remarkable higher failure rate(63.2% of 10 cases) Mouth opening over 30min was obtained in 92.3% of Group C, in 63.8% of Group B. but only in 52.2% of Group A. Joint pain which was mild and tolerable was noted in 3 of 13 Group C patients.
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, Myung-Rae Kim
