A Versatile Broadband Attached Proton Test Experiment for Routine C Nuclear Magnetic Resonance Spectroscopy.

The proposed broadband attached proton test sequence allows the user to easily record C nuclear magnetic resonance multiplicity-edited and quaternary-carbon-only spectra. Compared to earlier attached proton test experiments, it preserves both a tolerance for wide ranges of one-bond-coupling constant values and the effective suppression of residual CHn signals in the quaternary-carbon-only spectra. The recording of edited spectra or quaternary-carbon-only spectra is made easy by a single, user-controllable constant.

A minimally invasive two-stage crown lengthening procedure applying a tunneling technique.

Aim: The purpose of the present retrospective case series was to introduce a minimally invasive two-stage flapless crown lengthening procedure where a gingivectomy was avoided or minimized by reducing the bone height through a tunneling technique.

Materials And Method: Ten patients (median age 46.6 years, range 26.

The DEPTQ Experiment: Leveling the DEPT Signal Intensities and Clean Spectral Editing for Determining CH Multiplicities.

We propose a new C DEPTQ NMR experiment, based on the improved DEPTQ experiment, which is designed to unequivocally identify all carbon multiplicities (Cq, CH, CH, and CH) in two experiments. Compared to this improved DEPTQ experiment, the DEPTQ is shorter and the different evolution delays are designed as spin echoes, which can be tuned to different values; this is especially valuable when a large range of J coupling constants is to be expected. These modifications allow (i) a mutual leveling of the DEPT signal intensities, (ii) a reduction in cross-talk in the Cq/CH spectrum, and (iii) more consistent and cleaner CH/CH edited spectra.

Simplifying LR-HSQC spectra using a triple-quantum filter: The LR-HTQC experiment.

Long-range heteronuclear single quantum correlation (LR-HSQC) experiments may be applied for detecting long-range correlations but suffer from two disadvantages, common to all heteronuclear long-range correlation experiments: (i) The information density in LR-HSQC spectra may be too high to be used directly without "filtering out" shorter range correlations, and (ii) often, substantial differences in intensity among cross peaks exist, potentially hampering the visualization of weak, often crucial cross peaks. In this contribution, we propose a modified LR-HSQC experiment, the LR-HTQC experiment (Long-Range Heteronuclear Triple Quantum Correlation) that partially solves the problems aforementioned. We show theoretically and experimentally that the LR-HTQC experiment removes the intense cross peaks of CH spin pairs, substantially reduces the medium intensity of cross peaks originating from CHH' spin systems, whereas the typically weak intensity of cross peaks of CHH'H″ and C(H), spin systems is less affected.

D-HMBC versus LR-HSQMBC: Which experiment provides theoretically and experimentally the best results?

The long-range heteronuclear single quantum multiple bond correlation (LR-HSQMBC) experiment is the experiment of choice for visualizing heteronuclear long-range coupling interactions J across 4-6-bonds and is experimentally superior to the decoupled heteronuclear multiple-bond correlation (D-HMBC) experiment. Yet, the exact reasons have not been fully understood and established. On the basis of our recent investigation of the nonrefocused variants LR-HSQC and HMBC, we have extended a J -dedicated investigation to the D-HMBC and LR-HSQMBC experiments.