Papers by Author: Sung Chul Lim

Abstract: This study analyzed immediate implantation and immediate loading of chemical mechanical polished (CMP) and resorbable blast media (RBM) SSIII OSSTEM dental implants histometrically. The 1st, 2nd, 3rd, and 4th mandibular premolars were extracted from five adult dogs. Immediate implantation was performed in the fresh extraction sockets. Each dog received two types of implant: CMP and RBM. The first premolar was submerged, whereas the second, third, and fourth were not submerged. The implants were splinted using acrylic resin and subjected to immediate loading. After 4 months, X-rays were taken and analyzed. The animals were euthanized and processed histologically to obtain non-decalcified sections. Longitudinal ground sections of each implant were made, and histometry was analyzed under light microscopy. No significant difference was found between the control and experimental groups based on immediate loading (p > 0.05) and implant surface (p > 0.05). The implant survival rate and implant-to-bone contact rate after immediate loading were similar to those of submerged implants. The CMP and RBM dental implants did not differ in terms of implant survival rate and implant-to-bone contact rate.

Abstract: We evaluated the bone healing effect of grafting with synthetic β-tricalcium phosphate (β-TCP; Cerasorb®), bovine-derived hydroxyapatite (HA; Bio-Oss®), and a mixture of β-TCP and HA in rats. Each material was grafted in prepared 8-mm frontal bone defects in 15 rats. The control group underwent surgery without any grafting materials and was examined after 4 weeks, whereas the experimental groups received grafting materials and were examined after 1, 2, and 4 weeks. After implantation, the rats were sacrificed for histomorphometric studies using light microscopy, and the data were analyzed using analysis of variance. Considerable inflammation and fibrosis were observed after 1 and 2 weeks in all experimental groups, whereas the inflammation was reduced and fibrosis was stabilized after 4 weeks. New bone formation was observed at the defect margin. Statistically, there was no difference in new bone formation among the three experimental groups. In conclusion, there was no difference in new bone formation using Bio-Oss®, Cerasorb®, and a mixture of Bio-Oss® and Cerasorb®.

Abstract: We compared the effect of osteotomies performed using piezoelectric surgery (Piezosurgery®) and the conventional bur method on new bone formation in the rabbit mandible, focusing on light-microscopy observations of the early healing process after 1, 2, and 4 weeks. The time required to perform the osteotomy was also compared. We showed that piezoelectric surgery and the conventional bur method had no marked difference on early bone healing, although the osteotomy time was shorter with the conventional bur method than with Piezosurgery. Because the instrument used in Piezosurgery is sharp and more controllable, piezoelectric surgery should be more useful for delicate surgery, such as maxillary sinus lifting and segmental osteotomies, with the fewest complications.

Abstract: This studied determined the clinical effect of antibiotic use at the site of bone defect restoration in patients with osteoporosis, using tooth ash and plaster of Paris in ovariectomized rats. Forty-eight rats were assigned to four groups randomly and each group was further divided into 4 and 8 weeks after implantation. Histologic sections of the defects were obtained after surgery for histomorphometric analysis. Comparing each week, a significant difference was seen in bone formation by 4 weeks. Compared to controls, new bone formation increased significantly with tooth ash and saline, tooth ash and gentamicin, and tooth ash and gentamicin after ovariectomy. Tooth ash and saline resulted in the best bone formation. The degree of new bone formation was slightly lower when tooth ash and gentamicin were used compared to when tooth ash and saline were used. When tooth ash and gentamicin were compared according to ovariectomy, bone formation was significantly inhibited by ovariectomy at 4 weeks, while no significant difference was seen at 8 weeks.

Abstract: This study examined the role of tissue adhesives during early healing and the effects of tooth ash and plaster of Paris on bone healing in the presence of osteoporosis. Sixty rats were assigned to five groups randomly and each group was further divided into two subgroups, which were examined 4 and 8 weeks after implantation. Histologic sections and histomorphometric analysis of defects were obtained 4 and 8 weeks after surgery. Bone formation was significantly better in the non-ovariectomized groups compared to the ovariectomized group. A mixture of tooth ash and plaster of Paris is recommended, but not tissue adhesives, in ovariectomized cases.