Clinical and histological evaluation of subepithelial connective tissue after collagen sponge implantation in the human palate

Rocha AL, Shirasu BK, Hayacibara RM, Magro‐Filho O, Zanoni JN, Araújo MG. Clinical and histological evaluation of subepithelial connective tissue after collagen sponge implantation in the human palate. J Periodont Res 2012; 47: 758–765. © 2012 John Wiley & Sons A/S Background and Objective: Successful root‐coverage treatment depends on the thickness of the donor tissue. This study aimed to evaluate the thickness of donor tissue after augmentation of the connective tissue in the palatal area by implantation of lyophilized collagen sponge (Hemospon^®). Material and Methods: Ten patients with an indication for root coverage, whose palate was deficient in adequate connective tissue, were recruited. The procedure was carried out in two stages. In the first stage, the palatal thickness in the donor site was measured at three standardized points (points 1, 2 and 3), from the distal of the canine to the distal of the first molar, and the lyophilized collagen sponge was inserted. In the second stage, the palatal thickness over the implant was measured (at points 1, 2 and 3), two biopsies of the palatal mucosa were collected – one over the implant (experimental sample) and the other on the contralateral side (control sample) – and then root‐coverage treatment was performed. Analyses consisted of clinical assessment of the palatal measurements before and after sponge implantation, and histological assessment of the experimental and control biopsy samples. Data were analyzed using the Wilcoxon test. Results: Both analyses showed a significant increase in mean thickness, of 1.08 mm of neoformed tissue in the clinical analysis (the tissue at point 2 was the thickest of the three points) and of 0.53 mm in the histological analysis. Conclusion: The insertion of lyophilized collagen sponge induced a significant increase in the thickness of palatal connective tissue.     

鲜鹿茸全成分口腔崩解片制备工艺研究

目的考察影响冻干法制备鲜鹿茸全成分口腔崩解片的关键工艺因素,确定最佳制备工艺。方法以冻干赋形技术制备鲜鹿茸全成分口腔崩解片,采用单因素试验法,以促细胞增殖活性、含水量、崩解时间和外观性状为考察指标,研究关键工艺参数,确定最佳处方及制备工艺。结果优选出的最佳制备工艺条件:鲜鹿茸冻存温度-40℃,以醋酸缓冲液为稀释液,按1∶2的比例与鲜鹿茸细粉混匀,10%海藻糖为冻干保护剂,低温匀浆时间为10 min,匀浆分装后按优选工艺进行真空冷冻干燥制备鲜鹿茸全成分口腔崩解片,所得口腔崩解片能在30 s完全崩解,含水量低于5%,促细胞增殖活性与鲜鹿茸无差异。结论制备的鲜鹿茸全成分口腔崩解片具有生物活性高、服用方便的优点,最佳制备工艺稳定可行,适合工业化生产。