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EXPRESSION OF BMP4, BMP6 FOLLOWING SINUS ELEVATION WITH DBBP IN RABBIT  

Lee, Hyun-Suk (Dept. of Oral & Maxillofacial Surgery, Graduate School of Clinic Dental Science, The Catholic University of Korea)
Heo, Hyun-A (Dept. of Oral & Maxillofacial Surgery, College of Medicine, The Catholic University of Korea)
Pyo, Sung-Woon (Dept. of Oral & Maxillofacial Surgery, Graduate School of Clinic Dental Science, The Catholic University of Korea)
Lee, Won (Dept. of Oral & Maxillofacial Surgery, Graduate School of Clinic Dental Science, The Catholic University of Korea)
Publication Information
Maxillofacial Plastic and Reconstructive Surgery / v.29, no.6, 2007 , pp. 467-473 More about this Journal
Abstract
The most important factor for successful implantation is osseointegration between the implant and bone. The expression of bone morphogenetic proteins (BMPs) inducing bone formation would differ after maxillary sinus elevation. And within the same graft material. the expression of BMPs would change with time after graft. The aim of this study was to compare the relative expressions of BMP4 and BMP6 using real-time RT-PCR when maxillary sinus elevation was performed using deproteinated bovine bone powder (DBBP) as the graft material or absorbable gelatin sponge (AGS) as the filler without any graft material. Fifteen rabbits, each weighing between 3.0 to 3.5 Kg, were divided randomly into 5 groups of 3 animals each based on their time of sacrifice 0, 3, 5, 7 and 9 days). After exposure of the maxillary sinus bilaterally, bone graft was performed in the right maxillary sinus using DBBP ($BBP^{(R)}$ Oct Inc., Cheonan, Korea) and only AGS ($Gelfoam^{(R)}$ Pharmacia & Upjohn Company, Kalamazoo, MI, U.S.A) was placed into the left without any graft material. Each group of rabbits was sacrificed at 1, 3, 5, 7, or 9 days after operation and all specimens were harvested. And the following results were obtained using real-time RT-PCR from isolated total RNA of the samples. 1. The expression of BMP4 increased at postoperative 1 and 3 days in both DBBP group and AGS group. In AGS group. it decreased at postoperative 5 days. increased again at postoperative 7 days, and decreased at postoperative 9 days. In DBBP group, it increased until postoperative 7 days and decreased at postoperative 9 days. Although the expression of BMP4 was higher in DBBP group compared with AGS group, it was not statistically significant (p>0.05). 2. The expression of BMP6 increased at postoperative 1 and 3 days in both DBBP group and AGS group. In AGS group, it decreased at postoperative 5 days, increased again at postoperative 7 days, and decreased at postoperative 9 days. In DBBP group, it increased until postoperative 7 days and decreased at postoperative 9 days. Although the expression of BMP6 was higher in AGS group compared with DBBP group, it was not statistically significant (p>0.05). 3. There was no statistically significant difference in BMP expression in both groups during same period of time. It' s probably because DBBP and AGS both functioned as a space retainer so that the BMP expression in blood clot seemed to be similar. 4. Thus, DBBP would not offer many benefits for early bone regeneration compared with AGS. The expression of BMP in early bone formation seems to be more influenced by physical carrier rather than the graft type.
Keywords
Sinus elevation; BMP4; BMP6; Deproteinated Bovine Bone Powder (DBBP); Absorbable Gelatin Sponge (AGS);
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