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首页> 外文期刊>ASDC journal of dentistry for children >Kinetic cavity preparation effects on secondary caries formation around resin restorations: a polarized light microscopic in vitro evaluation.
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Kinetic cavity preparation effects on secondary caries formation around resin restorations: a polarized light microscopic in vitro evaluation.

机译：动腔制备对树脂修复体周围龋齿形成的影响：偏光显微镜下的体外评估。

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The purpose of this in vitro study was to compare the effect of conventional handpiece and kinetic cavity preparation (KCP, air abrasion) techniques of cavity preparation on caries-like enamel lesion formation. After a fluoride-free prophylaxis, twelve human molars were examined macroscopically to ensure that buccal and lingual surfaces were caries-free. Unfilled cavities were prepared in mesiobuccal (conventional [CU]) and mesiolingual (air abrasion [AU]) enamel surfaces. Cavities were prepared in distobuccal (conventional [CF]) and distolingual (air abrasion [AF]) enamel surfaces and restored with composite resin following placement of a bonding agent. Acid-etching of cavity walls was performed only with the conventionally prepared cavities restored with resin. Air abrasion (KCP) prepared cavities were restored without acid-etching of the cavity walls. Teeth were thermocycled (500 cycles, 5 degrees to 50 degrees C, 500 cycles) and exposed to an artificial caries medium for caries initiation and progression. After caries formation, two longitudinal sections were taken from unfilled and filled cavity preparations and examined by polarized light microscopy for wall lesion presence and mean surface lesion depth. Surface lesion depths were similar among groups after the caries initiation period (CU = 225 microns; AU = 237 microns; CF = 241 microns; AF = 251 [p > .05, ANOVA, DMR]), and progression (CU = 437 microns; AU = 415 microns; CF = 405 microns; AF = 429 um [p > 0.05, ANOVA, DMR]). Extensive wall lesions were present in all CU and AU; while small wedge-shaped wall lesions were significantly (p < .05, ANOVA, DMR) fewer in CF (19 percent & 21 percent) and AF (17 percent & 21 percent) following caries initiation and progression compared with unfilled controls. Resin restorations placed in cavities prepared by air abrasion (KCP) and conventional handpiece techniques provided similar degrees of protection against a secondary caries-like challenge.
机译：这项体外研究的目的是比较常规手机和腔准备的动态腔准备（KCP，空气磨蚀）技术对龋齿样牙釉质病变形成的影响。进行无氟预防后，肉眼检查了十二个人类磨牙，以确保颊和舌表面无龋齿。在中颊（常规[CU]）和中舌（空气磨蚀[AU]）瓷釉表面准备未填充的型腔。在脱颊（常规[CF]）和脱舌（空气磨损[AF]）搪瓷表面制备型腔，并在放置粘合剂后用复合树脂进行修复。腔壁的酸蚀仅在用树脂修复的常规制备的腔中进行。不用空气腐蚀（KCP）制备的型腔即可恢复，而无需酸蚀型腔壁。将牙齿热循环（500个循环，5到50摄氏度，500个循环），并暴露于人造龋齿培养基中以引发和发展龋齿。龋形成后，从未充满和充满的腔准备中取出两个纵向切片，并通过偏振光显微镜检查壁病变的存在和平均表面病变深度。龋齿发生期后各组之间的表面病变深度相似（CU = 225微米; AU = 237微米; CF = 241微米; AF = 251 [p> .05，ANOVA，DMR]）和进展（CU = 437微米） ; AU = 415微米; CF = 405微米; AF = 429微米[p> 0.05，ANOVA，DMR]）。所有CU和AU均存在广泛的壁病变。与未填充的对照组相比，龋齿发生和发展后，小的楔形壁病变在CF（分别为19％和21％）和AF（分别为17％和21％）和F（分别为<0.05，ANOVA，DMR）方面显着减少。放置在通过空气磨蚀（KCP）和常规机头技术制备的腔体中的树脂修复体提供了类似程度的防护，以抵抗继发性龋齿状挑战。

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