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Three-dimensional Study on Marginal Microleakage of Composite Resin Restorations

Author: ZhaoYan
Tutor: GaoPing
School: Tianjin Medical University
Course: Clinical Stomatology
Keywords: Composite resin Microleakage Microfocus CT Three-dimensional reconstruction Thermal cycling test
CLC: R783.1
Type: Master's thesis
Year: 2011
Downloads: 51
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Abstract

Objective: Applied Micro focus CT and 3D reconstruction techniques, determination of composite resin Filtek Z250 Universal, FiltekP60 dental composite resin, PALFIQUE ESTELITE flow resin filling body edge microleakage provide reference and basis for clinical caries treatment. Method: select orthodontic reasons were removed anterior permanent molars 40 require teeth complete decay, no cracks, no wear, apical developmental completely. Periodontal attachment of soft tissue curettage and stones, 0.9% saline and stored at room temperature shelf life of not more than 30 days. Water cooling, using a high-speed turbine diamond bur at the buccal surface of the tooth, the enamel cementum the industry crown side 1.Omm at, preparation of diameter 1mm, about the depth of l mm hole shape. 40 teeth were randomly divided into four groups of 10 teeth. Group A: Filtek Z250 composite resin; Group B: Filtek P60 dental composite resin; C group: PALFIQUE ESTELITE flow resin (low flow): D group: PALFIQUE ESTELITE flow resin (high liquidity). All teeth in 37 ℃ distilled water reserve 24h. The specimens were alternately placed in the electronic thermostat water bath thermal cycles, once per cycle specimens respectively at 5 ℃ (± 2. C) and 55. C (± 2 ℃), hot and cold water to stay in the 30s, a total of 600 cycles. After thermal cycles, the specimens were removed, and closure of the apical foramen with wax, and then on the tooth surface evenly coated except to the extent of the two layers of nail polish (filling the body and the edge of the outer 1 mm), dry naturally. The specimen was immersed in a 50% ammoniacal silver nitrate solution was stored 24h, removed after running water, until the washing liquid no visible black particles. The specimen was then immersed in the developer, and fluorescent light lower developing 8h. After the developing, remove the specimens, 5min running water. Microfocus CT chosen Switzerland SCANCO Medical AG μCT80 scan parameters: voltage 70kv current 114uA resolution of 20um, integration time of 400ms. The sample CT scans, the image data in DICOM file format import tool software in RATOC. The dental model fixed on the carrier stage, to prevent it from moving in the scanning process. Model midsagittal plane and perpendicular to the ground plane of the cut end parallel to the ground plane of the model. The median filtering method of CT image preprocessing, to suppress random noise and improve image quality. The Application Surface Reconstruction teeth three-dimensional reconstruction. First, the threshold of the two-dimensional image segmentation and editing, then the three-dimensional identification and reconstruction of ROI, select the volume (volume) parameters measured silver fillings and tooth interface between sediment volume. Recorded data the input SPSS 18.0 statistical software for the experimental data univariate analysis of variance and LSD-t test. All data are presented as mean ± standard deviation (x ± s) said, P lt; 0.05 for the difference was statistically significant. Results: The test of normality and variance homogeneity test each group of samples showed normal distribution and variance homogeneous. Completely randomized design comparing multiple samples univariate analysis of variance, the overall analysis of the four sets of data, F = 4.474, P lt; 0.05, statistically significant, and that the results of the four groups microleakage is not exactly the same. Multiple samples are a number of multiple comparisons LSD-t test, further microleakage of four groups were compared, the results: A group and B group comparison, P lt; 0.05, think of group A and group B The difference was statistically significant. Group A with C and D group comparison, P gt; 0.05 A and group C, D group difference was not statistically significant. Group B with C, D group comparison, P lt; 0.05, group B, C, D group difference was statistically significant. Group C and Group D, the result is P gt; 0.05 was no significant difference between Group C and Group D Conclusion: Filtek z250 composite resin, P60 composite resin and Jumeirah flow resin filling tooth defect between the filling material and the tooth has a different degree of microleakage. 2, Filtek z250 composite resin and the Jumeirah flow resin edge level of leakage is less than Fi] tek P60 composite resin (P lt; 0.05).

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