Our results supported the use of single-component adhesive systems in cavities prepared using Er:YAG laser. The step of acid etching must be maintained for the whole cavity walls in regard of the microleakage values.

Nowadays the implants rehabilitations are used deeply by clinicians. The importance to technological improvement is working to find the best surface of the fixture to obtain a good and stable osteointegration. By the use of the Energy Dispersive X-ray (EDX) analysis and the X-ray Photoemission Spectroscopy (XPS) evaluate the surface quality of commercial implants. The XPS analysis was made to evaluate the chemical elements that compose the material surface of the implant and determine the state of atomical connections. The EDX analysis was performed to evaluate the characteristic qualitative and quantitative of the metallic alloys of the fixtures to determinate the pureness of the metals under the surfaces. The major difference found between the samples is the amount of surface aluminum (in oxidized state, alumina), which in the samples 2 appears to be more than an order of magnitude greater (12 times). In Sample 2 there are traces of P, Na and Cl not present in Sample 1. The presence of C, O, N, Si and Ca are similar on both samples (1 and 2). Now, in the market there are many different dental implants. All the producers are working hard on micro and macro design of the fixtures, but not so many attentions is spent on the type of the alloy composing the implant. From this analysis, it is observed that different Type 4 dental implant are not so similar by composition. Moreover, the pure Titanium is well tolerated by biological tissues, on the other hand is not well known if the presence of other materials can influence the biological reaction. The samples of the fixture analyzed present different composition of the alloy, although both classified as Type 5 Titanium. Further studies on this topic are needed to understand if these differences of alloy composition can influence the clinical outcome.

The aim of the present paper is to explore, through a high-resolution synchrotron radiation-based micro computed tomography experiment, the efficiency of the Er:YAG laser involvement in the debridement of the root canal of pathologic teeth, applied after the chemo-mechanical treatment of the canal. The adhesion quality of root canal filling is the consequence of the root canal cleaning and shaping, thus preventing the leakage. Twelve extracted single-rooted teeth were considered. The first 5 mm of the roots, corresponding to the apical region of the teeth, were initially investigated through high-resolution synchrotron radiation phase-contrast micro computed tomography. Afterwards, a chemo-mechanical endodontic treatment was performed and the same region of the teeth was imaged again. Finally, an Er:YAG laser with PIPS tip treatment was applied on the same teeth and a last tomographic scan was done. The chemo-mechanical treatment properly removed the necrotic tissue only in the upper part of the apical area of root canal, but tissue debris were found in the lower and partially also in the medium and upper part of the apical region, especially when the apical area exhibited a larger curvature. The laser treatment applied afterwards gave good results in terms of removing the debris from the apical area of root canal, mainly when they remained in the main canal. The present study proves the capability of Er:YAG with PIPS tips laser treatment to enhance the removing of tissue debris from the apical region of root canals after a chemo-mechanical treatment. The high-resolution synchrotron radiation-based phase contrast micro computed tomography is the most powerful tool for a non-destructive 3D investigation method of the root canal morphology analysis and a proper characterization technique for the assessment of the endodontic treatment.

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