Histological differences in the adherence of connective tissue to laser-treated abutments and standard abutments for dental implants. An experimental pilot study in humans

Background: The goal of the current study is to assess the difference in connective tissue adherence to laser microtextured versus machined titanium abutments. Material and Methods: Six patients were selected and each of them received 2 implants, one combined with a laser treated abutment and one with a machined abutment. After three months, the abutments were retrieved together with their surrounding gingival tissue for histological analysis. Qualitative and quantitative evaluation of microscopical images was performed to assess the presence or absence of adherence between the soft tissues and the abutment, and the percentage of soft tissue adhered to the two different surfaces. Results: Intimate adherence between connective tissue and the laser treated abutments, while on machined abutments no adherence was detected. A significant difference was found in the percentage of surface in contact with soft tissue between both implant abutments p=0.03. Conclusions: Within the limitation of the current study, it can be concluded that connective tissues show enhanced adherence to microtextured abutments compared to machined abutments (AU)

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Computer-aided system for morphometric mandibular index computation. (Using dental panoramic radiographs).

OBJECTIVE: We propose and validate a computer-aided system to measure three different mandibular indexes: cortical width, panoramic mandibular index and, mandibular alveolar bone resorption index. STUDY DESIGN: Repeatability and reproducibility of the measurements are analyzed and compared to the manual estimation of the same indexes. RESULTS: The proposed computerized system exhibits superior repeatability and reproducibility rates compared to standard manual methods. Moreover, the time required to perform the measurements using the proposed method is negligible compared to perform the measurements manually. CONCLUSIONS: We have proposed a very user friendly computerized method to measure three different morphometric mandibular indexes. From the results we can conclude that the system provides a practical manner to perform these measurements. It does not require an expert examiner and does not take more than 16 seconds per analysis. Thus, it may be suitable to diagnose osteoporosis using dental panoramic radiographs.

Histomorphological study of the bone regeneration capacity of platelet-richplasma, bone marrow and tricalcium phosphate Experimental study on pigs

Introduction: Bone defects are rather common after oral surgery and may prove difficult to repair. Objective: Weprovide a histomorphological analysis of the bone regenerative capacity of platelet-rich plasma at different concentrationsand the extraction of platelet-rich bone marrow, compared with &bgr;-tricalcium phosphate. Methodology:We performed an experimental study on 8 pigs, in which we performed trepanations of the mandible inorder to place the materials to be studied. Using an electron microscope, we observed the samples obtained andtook a series of photographs in order to analyze the samples through a gray-scale histogram system.Results: Ossification phenomena were present in 96% of the charged defects, regardless of the material used to fillit. Platelet-rich plasma (PRP) and the bone marrow (M) showed an equivalent degree of osteogenesis, 12.3 and 13.4respectively, which is greater in than the control group. The platelet-poor plasma (PPP) shows a capacity similarto the control groups (C), with an average count of 14.03 and 14.12 respectively. Tricalcium phosphate (TP) wasshown to be effective as an ossification inducer, 3.03 times stronger than the control group. Conclusions: Ossificationoccurs in most of the charged defects. PRP and M had the greatest osteogenic capacity but PPP was nomore effective than the control (AU)

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Histomorphological study of the bone regeneration capacity of platelet-rich plasma, bone marrow and tricalcium phosphate: Experimental study on pigs.

INTRODUCTION: Bone defects are rather common after oral surgery and may prove difficult to repair. OBJECTIVE: We provide a histomorphological analysis of the bone regenerative capacity of platelet-rich plasma at different concentrations and the extraction of platelet-rich bone marrow, compared with beta-tricalcium phosphate. METHODOLOGY: We performed an experimental study on 8 pigs, in which we performed trepanations of the mandible in order to place the materials to be studied. Using an electron microscope, we observed the samples obtained and took a series of photographs in order to analyze the samples through a gray-scale histogram system. RESULTS: Ossification phenomena were present in 96% of the charged defects, regardless of the material used to fill it. Platelet-rich plasma (PRP) and the bone marrow (M) showed an equivalent degree of osteogenesis, 12.3 and 13.4 respectively, which is greater in than the control group. The platelet-poor plasma (PPP) shows a capacity similar to the control groups (C), with an average count of 14.03 and 14.12 respectively. Tricalcium phosphate (TP) was shown to be effective as an ossification inducer, 3.03 times stronger than the control group. CONCLUSIONS: Ossification occurs in most of the charged defects. PRP and M had the greatest osteogenic capacity but PPP was no more effective than the control .