Dummer P M, Lyle L, Rawle J, Kennedy J K
Department of Conservative Dentistry, Dental School, University of Wales College of Medicine, Cardiff, U.K.
Int Endod J. 1994 Jan;27(1):32-8. doi: 10.1111/j.1365-2591.1994.tb00226.x.
The aim of this in vitro study was to assess the quality of root canal obturation and degree of apical dye penetration in teeth root-filled with either laterally condensed cold gutta-percha or Thermafil obturators. A total of 144 extracted teeth with single roots were included in the study. All canals were prepared with a standard technique using a sonic handpiece with copious irrigation. Radiographs taken of the teeth to show the maximum degree of canal curvature were then exposed and the angle, radius and position of curvature determined. This information about the canals, together with their working length and diameter at end-point was used to divide the teeth into two experimental and two control groups. A total of 71 teeth were filled with Thermafil obturators, 69 with lateral condensation while four teeth remained unfilled and acted as controls. Following obturation, the teeth were radiographed in two planes and the technical quality of fill assessed on a four-point scale. All access cavities were then sealed and the teeth immersed in dye for 48 h before being split longitudinally. Linear dye penetration via the apical foramen was then assessed. In both straight and curved canals obturation with Thermafil obturators was significantly quicker (P < 0.001) then lateral condensation. Apical extrusion of gutta-percha occurred significantly more often in straight canals obturated with lateral condensation (P < 0.005) but there was no difference in curved canals. There was little difference in the radiographic quality of fill in the apical halves of the root fillings but Thermafil obturators were significantly better in the coronal halves when viewed from the proximal.(ABSTRACT TRUNCATED AT 250 WORDS)
本体外研究的目的是评估用侧向加压冷牙胶或热牙胶充填根管的牙齿的根管充填质量及根尖染料渗透程度。该研究共纳入144颗单根离体牙。所有根管均采用标准技术，使用超声手机并大量冲洗进行预备。然后拍摄牙齿的X线片以显示根管的最大弯曲程度，并确定弯曲角度、半径和位置。这些关于根管的信息，连同其工作长度和终点处的直径，用于将牙齿分为两个试验组和两个对照组。共有71颗牙齿用热牙胶充填，69颗用侧向加压法充填，4颗未充填作为对照。充填后，在两个平面拍摄牙齿的X线片，并以四分制评估充填的技术质量。然后封闭所有髓腔，将牙齿浸泡在染料中48小时，之后沿纵向劈开。然后评估染料通过根尖孔的线性渗透情况。在直根管和弯曲根管中，用热牙胶充填均明显比侧向加压法快（P<0.001）。侧向加压法充填直根管时，牙胶尖根尖挤出的情况明显更常见（P<0.005），但在弯曲根管中无差异。根尖部根管充填物的X线片充填质量差异不大，但从近中观察时，热牙胶在冠部明显更好。（摘要截短于250字）
