Pit and fissure depth in the enamel of mandibular third molars: An open gate for microleakage?

Osvaldo Zmener, Cornelis H Pameijer, Ana C Boetto, Mariana Picca
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Abstract

The aim of this descriptive ex vivo study was to evaluate qualitatively the depth of pit and fissures (P&F) of the enamel in human mandibular third molars. Fifty (n=50) extracted human mandibular third molars were cleaned and disinfected. All tooth surfaces were coated with nail varnish except for a 1-mm margin around the periphery of the occlusal surface. The teeth were immersed for 48 hours at 37 °C in 1% methylene blue dye solution prepared in artificial saliva. After cleaning, the crowns were separated from the root at the cementoenamel junction and subsequently sectioned longitudinally in buccolingual direction at the location of the central fossa. All sections were examined using a stereoscopic microscope and photographed. The images were downloaded on a computer. The length of penetration of the P&F was recorded using the following scoring system: C1: P&F extended to half of the enamel thickness; C2: P&F extended beyond half of the enamel thickness without reaching the dentine-enamel junction; C3: P&F extended to the dentine-enamel junction. For pits, C1, C2 and C3 were observed in 35, 9 and 6 teeth, respectively, while for fissures, C1, C2 and C3 were observed in 15, 18 and 17 teeth, respectively. The P&F detected in the samples extended to the deepest portions of enamel, quite frequently reaching the enamel-dentine junction. Clinicians should recognize that even if pits and fissures are not clinically obvious, they penetrate deep into the enamel and frequently reach the dentine-enamel junction. Effective treatment is recommended to block access to P&F, thus preventing ingress of bacteria.

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下颌第三磨牙牙釉质的凹陷和裂缝深度:微渗漏的一个开放的大门?
这项描述性离体研究的目的是定性地评估人类下颌第三磨牙牙釉质的凹坑和裂缝深度。50例(n=50)拔除的人下颌第三磨牙进行清洗和消毒。除了咬合面周围1毫米的边缘外,所有牙齿表面都涂有指甲油。牙齿在人工唾液配制的1%亚甲基蓝染料溶液中浸泡48小时,温度37℃。清洁后,在牙髓-牙釉质交界处将冠与根分离,然后在中央窝位置沿颊舌方向纵向切片。所有切片用立体显微镜检查并拍照。这些图像被下载到电脑上。采用以下评分系统记录松脱层的穿透长度:C1:松脱层延伸至牙釉质厚度的一半;C2: P&F延伸到牙釉质厚度的一半以上,未到达牙本质-牙釉质交界处;C3: P&F延伸至牙本质-牙釉质交界处。对于凹牙,分别有35颗、9颗和6颗观察到C1、C2和C3;对于裂牙,分别有15颗、18颗和17颗观察到C1、C2和C3。在样品中检测到的P&F延伸到牙釉质的最深处,经常到达牙釉质-牙本质交界处。临床医生应该认识到,即使凹痕和裂缝在临床上并不明显,它们也会深入到牙釉质中,并经常到达牙本质-牙釉质交界处。建议进行有效的处理,以阻断通往P&F的通道,从而防止细菌进入。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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