A simple method to estimate restoration volume as a possible predictor for tooth fracture.
A simple method to estimate restoration volume as a possible predictor for tooth fracture.
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一种估计修复体体积的简单方法，作为牙齿骨折的可能预测指标。
DOI：
10.1016/s0022-3913(03)00267-1
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Steet,TC
中科院分区：
文献类型：
--
作者：
Sturdevant,JR;Bader,JD;Shugars,DA;Steet,TC
STATEMENT OF PROBLEMMany dentists cite the fracture risk posed by a large existing restoration as a primary reason for their decision to place a full-coverage restoration. However, there is poor agreement among dentists as to when restoration placement is necessary because of the inability to make objective measurements of restoration size.PURPOSEThe purpose of this study was to compare a new method to estimate restoration volumes in posterior teeth with analytically determined volumes.MATERIAL AND METHODSTrue restoration volume proportion (RVP) was determined for 96 melamine typodont teeth: 24 each of maxillary second premolar, mandibular second premolar, maxillary first molar, and mandibular first molar. Each group of 24 was subdivided into 3 groups to receive an O, MO, or MOD amalgam preparation design. Each preparation design was further subdivided into 4 groups of increasingly larger size. The density of amalgam used was calculated according to ANSI/ADA Specification 1. The teeth were weighed before and after restoration with amalgam. Restoration weight was calculated, and the density of amalgam was used to calculate restoration volume. A liquid pycnometer was used to calculate coronal volume after sectioning the anatomic crown from the root horizontally at the cementoenamel junction. True RVP was calculated by dividing restoration volume by coronal volume. An occlusal photograph and a bitewing radiograph were made of each restored tooth to provide 2 perpendicular views. Each image was digitized, and software was used to measure the percentage of the anatomic crown restored with amalgam. Estimated RVP was calculated by multiplying the percentage of the anatomic crown restored from the 2 views together. Pearson correlation coefficients were used to compare estimated RVP with true RVP.RESULTSThe Pearson correlation coefficient of true RVP with estimated RVP was 0.97 overall (P≤.0001). Coefficients for comparisons stratified by tooth type, restoration type, and restoration size groups were all greater than 0.90 (P≤.0001).CONCLUSIONWithin the limitations of this study, the high correlation between estimated RVP and true RVP indicated that estimated RVP was an accurate method to quantify the relative volume of restorative material in coronal tooth structure. The fact that it can be done in a nondestructive manner makes it attractive for clinical situations.
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从谢尔曼丙酸杆菌中分离和表征焦磷酸依赖性磷酸果糖激酶。
DOI：
10.1016/s0021-9258(19)40727-8
发表时间：
1975
期刊：
The Journal of biological chemistry
影响因子：
--
作者：
William;E.;O’BRIEN;Susanne;Bowien;Harland;G.;Wood
通讯作者：
Wood
果糖 2,6-二磷酸不敏感焦磷酸盐的存在：厌氧原生动物胎儿三滴虫、阴道毛滴虫和前列腺等毛虫中的果糖 6-磷酸磷酸转移酶。
影响因子：
1.5
作者：
Mertens,E;VanSchaftingen,E;Müller,M
通讯作者：
Müller,M
阴道毛滴虫的糖酵解和戊糖磷酸循环：I.酶活性模式和恒定比例五重奏
DOI：
--
发表时间：
1974
期刊：
影响因子：
--
作者：
P. Arese;P. Cappuccinelli
通讯作者：
P. Cappuccinelli
酵母己糖激酶的缔合平衡和反应酶凝胶过滤。
DOI：
--
发表时间：
1983
期刊：
The Journal of biological chemistry
影响因子：
--
作者：
Furman,TC;Neet,KE
通讯作者：
Neet,KE
盘基网柄菌的葡萄糖激酶。
影响因子：
2.9
作者：
P. Baumann
通讯作者：
P. Baumann