Correr Gisele Maria, Bruschi Alonso Roberta Caroline, Puppin-Rontani Regina Maria, Correr-Sobrinho Lourenço, Coelho Sinhoreti Mario Alexandre
Department of Restorative Dentistry, Dental Materials Area, Piracicaba Dental School-UNICAMP, Piracicaba, São Paulo, Brazil.
Acta Odontol Scand. 2005 Aug;63(4):227-32. doi: 10.1080/00016350510019955.
The purpose of this study was to evaluate the use of resin liner on deproteinized substrate on marginal and internal adaptation of composite restorations.
Twenty-four recently extracted 3rd molars were selected. The crowns were sectioned in a mesio-distal direction, and the specimens were ground to expose a flat enamel area of at least 6 mm in diameter. Cavities were prepared on the central area of flattened surfaces. The specimens were randomly assigned into four groups (n = 12): SB - 1. Acid etch, 2. Single bond application (SB); NaOCl/SB - 1. acid etch, 2. 10% sodium hypochlorite solution application for 60 s (NaOCl), 3. SB; SB/PL - 1. acid etch, 2. SB, 3. protect liner F (PL); NaOCl/SB/PL - 1. acid etch, 2. NaOCl, 3. SB, 4. PL. All cavities were restored with Filtek Z250 and polished. The outer and internal margins were stained using Caries Detector (Kuraray), observed under the stereomicroscope, and transferred to a computer measurement program. The length of the gap was expressed as a percentage of the total length of the margins observed. Data (internal adaptation) were submitted to ANOVA and Tukey's test.
There were no gaps at enamel outer margins in any specimen of any group. There was no statistically significant difference in internal adaptation between SB (18%) and NaOCl/SB (18%). NaOCl/SB/PL showed the worst internal adaptation (21%), with the higher percentage of internal gaps, statistically differing from SB/PL, which showed the best internal adaptation (12%).
Resin liner can effectively enhance internal adaptation on demineralized dentin. However, on demineralized and deproteinized dentin it affects the internal adaptation of composite restorations negatively.
本研究旨在评估树脂衬层在脱蛋白基质上对复合树脂修复体边缘及内部适应性的影响。
选取24颗近期拔除的第三磨牙。将牙冠沿近远中方向切开，磨制标本以暴露出直径至少为6mm的平坦釉质区域。在平坦表面的中央区域制备窝洞。将标本随机分为四组（n = 12）：SB组 - 1. 酸蚀，2. 应用单组分粘结剂（SB）；NaOCl/SB组 - 1. 酸蚀，2. 应用10%次氯酸钠溶液60秒（NaOCl），3. 应用SB；SB/PL组 - 1. 酸蚀，2. 应用SB，3. 应用保护衬层F（PL）；NaOCl/SB/PL组 - 1. 酸蚀，2. 应用NaOCl，3. 应用SB，4. 应用PL。所有窝洞均用Filtek Z250修复并抛光。使用龋蚀检测剂（可乐丽）对外边缘和内边缘进行染色，在体视显微镜下观察，并传输至计算机测量程序。间隙长度以观察到的边缘总长度的百分比表示。数据（内部适应性）进行方差分析和Tukey检验。
任何组的任何标本在釉质外边缘均无间隙。SB组（18%）和NaOCl/SB组（18%）在内部适应性方面无统计学显著差异。NaOCl/SB/PL组显示出最差的内部适应性（21%），内部间隙百分比更高，与显示出最佳内部适应性（12%）的SB/PL组在统计学上存在差异。
树脂衬层可有效增强在脱矿牙本质上的内部适应性。然而，在脱矿和脱蛋白的牙本质上，它会对复合树脂修复体的内部适应性产生负面影响。
