Santiago González-LópezUniversity of Granada | UGR · Department of Stomatology
Santiago González-López
MD, DDS, PhD
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77
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Introduction
Skills and Expertise
Publications
Publications (77)
Dentists in Spain reached equal gender representation in 2012 and the number of female dentists has continued to grow (until 57.3% in 2020). This study aims to increase evidence about the gender distribution on the high responsibility positions and opinion leaders of the dental profession and academia. Composition of the executive comities of the m...
Purpose:
To investigate the effects of four commercial silver diamine fluoride (SDF) agents on the chemical composition and microstructural properties of dentin, and its relation to the bond strength of two adhesives.
Materials and methods:
Ninety human molars were randomly divided into sound dentin (negative control), demineralized dentin (posi...
The aim of this study is to measure color changes caused by two regenerative protocols over 3 months, and the effectiveness of internal bleaching. Twenty extracted human maxillary anterior teeth were used. The apex and canal were prepared to reproduce immature teeth. Teeth were divided: group 1: Triple-antibiotic-paste was applied for 3 weeks and t...
Background:
To determine the perception of Spanish dentists about the situation of the profession nowadays and how the changes occurred in dental workforce (in number and gender of the past twenty years) have affected their personal and professional lives, under a gender-based approach.
Material and methods:
An online survey comprising of 51 opi...
Objective:
This study evaluated the potential combined effects of nanohydroxyapatite and proanthocyanidin on the remineralization and collagen stabilization of demineralized dentin.
Methods:
Seventy-five coronal dentin beams (6 × 1 × 1 mm3) were randomly allocated into five experimental groups (n = 15): Sound (no treatment), Control (pH-cycling)...
The objective of the present study was to investigate the effects of chronic lead exposure on the mineral properties of alveolar bone. For this purpose, female Wistar rats (n = 8) were exposed to 1000 ppm lead acetate in drinking water for 90 days, while the control group (n = 5) was treated with sodium acetate. The alveolar bone structure and chem...
The objective of this work was to compare the micro-tensile bond strength (µTBS) of CAD/CAM (Computer-Aided Design/ Computer-Aided Manufacturing) specimens cemented with different pairing of adhesives and resin-cements using two Immediate Dentin Dealing (IDS) approaches in comparison with Delay Dentin Sealing (DDS). Coronal dentin from 108 molars w...
Objectives
This study compared the chemical composition, microstructural, and mechanical properties of human and bovine dentin subjected to a demineralization/remineralization process.Materials and methodsHuman and bovine incisors were sectioned to obtain 120 coronal dentin beams (6 × 1 × 1 mm3) that were randomly allocated into 4 subgroups (n = 15...
Objectives
To compare the degree of conversion (DC) of different flowable and sculptable bulk-fill composites (BFC), at 0- and 4-mm depths from the surface, by Fourier transform infrared (FTIR), attenuated total reflection FTIR (ATR-FTIR), and FT-Raman spectroscopic techniques.
Methods and Materials
Six BFC were investigated, including three sculp...
Broiler chickens have an extreme physiology (rapid growth rates) that challenges the correct bone mineralization, being an interesting animal model for studying the development of bone pathologies. This work studies in detail how the mineralization, chemistry, and structural organization of tibiae bone in broiler chickens change with age during the...
Abstract
This study tested the null hypothesis that the opacity of RealSeal SE (RSSE) sealer makes light-curing inefficient, while the degree of conversion (DC) is similar regardless of curing method. Fourteen uniradicular teeth were sectioned at 15 mm from the apex. Root canals were instrumented using the Reciproc file system, bulk-filled with RSS...
Aim: The aims were to measure the physico-chemical properties of Redbull® (pH and titratable acidity), and to study the changes of the mineral content and microhardness of the enamel surface after exposure to Redbull® and to study the remineralizing effect of saliva. Experimental Approach: 24 enamel specimens (4x3mm) were randomly divided into 3 gr...
Aim: The aims were to measure the physico-chemical properties of Redbull® (pH and titratable acidity), and to study the changes of the mineral content and microhardness of the enamel surface after exposure to Redbull® and to study the remineralizing effect of saliva. Experimental Approach: 24 enamel specimens (4x3 mm) were randomly divided into 3 g...
This study evaluated cell viability, microhardness and flexural strength of two ceramic composites systems (ZA and AZ), pure alumina and zirconia. There were prepared homogeneous mixtures of 78wt%Al2O3+20wt%3Y-TZP+2wt%Al2O3w (AZ) and 80wt%3YTZP+18wt%Al2O3+2wt%Al2O3w (ZA), as well as 3Y-TZP (Z), pure Al2O3 (A) and commercial monolithic 3Y-TZP (Zc)....
The abstract should summarize the content of the paper. Try to keep the abstract below 150 words. The aim of the present study was to investigate the effects of bleaching procedures of a high concentration of hydrogen peroxide (HP) on dehydrated enamel surface. Flat enamel samples embedded in epoxy resin were dehydrated and treated with 35% HP of p...
The aim of the study is to determine the influence of the type of bracket, on bond strength, microhardness and conversion degree (CD) of four resin orthodontic cements. Micro-tensile bond strength (µTBS) test between the bracket base and the cement was carried out on glass-hour-shaped specimens (n=20). Vickers Hardness Number (VHN) and micro-Raman...
A combination of atomic absorption spectroscopy (AAS), Fourier transform infrared spectroscopy (FTIR), scanning electronic microscopy (SEM), and gas adsorption techniques was used to characterize the effect of 30 % hydrogen peroxide (HP) on enamel surface. To perform the analyses of AAS, 1 ml of 30 % HP was added to 30 mg of a bovine enamel powder...
Objective: The aim of this study was to determine the microtensile bond strength to root dentin of AH Plus™ and EndoREZ® with Clearfil Liner Bond 2V and Optibond Solo™ Plus adhesive systems.
Study Design: The coronal and middle thirds of six single rooted bovine teeth was split longitudinally in a mesio-distal direction. The two halves were joined...
Purpose:
The purpose of this study was to test the hypothesis that the pulp medication ferric sulphate (FS) may remain on primary dentin, affecting its microchemical structure and the bond strength of adhesives to primary dentin.
Materials and methods:
The effects of FS and pre-bonding conditioning (37% phosphoric acid [PA] for 15 s or a self-et...
To investigate the bond strength and seal ability produced by AH Plus/gutta-percha, EndoREZ and RealSeal systems to root canal dentin.
Sixty extracted single-root human teeth, instrumented manually to size 40, were divided into three groups (n=20) according to the sealer used; G1: AH Plus, G2: EndoREZ, and G3: RealSeal sealers. After filling using...
Objectives: To investigate the bond strength and seal ability produced by AH Plus/gutta-percha, EndoREZ and RealSeal systems to root canal dentin. Material and Methods: Sixty extracted single-root human teeth, instrumented manually to size 40, were divided into three groups (n=20) according to the sealer used; G1: AH Plus, G2: EndoREZ, and G3: Real...
Purpose:
To compare the percentage of collagen exposed in dentin root thirds after two irrigation protocols with manual or rotary instrumentation using two methacrylate resin-based sealers.
Materials and methods:
Forty-eight single-root human teeth were prepared with manual (n = 24) or nickeltitanium ProFile rotary (n = 24) instrumentation, usin...
The purpose of this study was to determine the micro-tensile bond strength (MTBS) to dentin of seven adhesive systems (total and self-etch adhesives) after 24 h and 5,000 thermocycles. Dentin surfaces of human third molars were exposed and bonded with two total-etch adhesives (Adper Scotchbond 1 XT and XP Bond), two two-step self-etch adhesives (Ad...
Objectives
The objective of this study was to determine microtensile bond strength (μTBS) to dentin of three self-adhesive and a total-etch resin cements used for luting different treated indirect composites.
Materials and methods
Composite overlays (Filtek Z250) were prepared. Their intaglio surfaces were ground with 600-grit SiC papers and random...
To follow the chemical composition of bovine enamel during phosphoric acid-induced demineralization.
Enamel samples were ground into a fine powder, selecting the 150- and 200-µm fractions in order to obtain a more homogeneous study material. They were immersed in diluted phosphoric acid (0.1%) for increasing durations ranging from 1 to 1440 min. Th...
Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) at 24h and at 6 months with and without restoration and with different cements.
Methods: 90 monoradicular teeth, crowns were cut and endodontic treatment was made. The canal preparation was made with a calibrated drill syste...
To investigate regional shear bond strength to lateral walls of ceramic inlays in occlusal and occlusoproximal cavities using etch-and-rinse and self-adhesive resin cements and a glass-ionomer luting agent.
IPS e.max Press ceramic inlays were made in 50 Class I and 50 Class II standardized cavities in intact extracted human molars and divided into...
This article describes a technique for duplicating occlusal surface anatomy using the Biteperf device. Duplication requires an intact occlusal enamel surface and is only indicated when caries lesions are hidden. The occlusal matrix technique allows for preservation of all anatomic details. When the last layer of composite has been placed, the occlu...
To measure the demineralization capacity of 37% phosphoric acid on surface and subsurface bovine enamel after bleaching with hydrogen peroxide (H2O2).
Three equally-sized sections with 16 mm2 of exposed enamel surface were obtained from the enamel of 10 bovine incisors. One specimen sample from each crown was assigned to one of three groups (n = 10...
Objective: Compare the push-out bond strength of fiber post (Rebilda Post®, Voco, Cuxhaven) luted with resin cement (Rebilda DC®, Voco, Cuxhaven) in different root thirds (cervical, middle,apical) after 24 hour storage and six months storage with core.
Methods: twenty human anterior teeth extracted for periodontal reasons were decoronated and endo...
Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) and evaluate the type of fracture produced at 6 months with or without a restoration.
Methods: 20 monoradicular teeth, crowns were cut and endodontic treatment of the root (AH plus® Dentsply De Trey, Germany and gutta-perch...
Objectives: Measure the bond strength of cement with the push-out test in different root thirds (cervical, middle and apical) and evaluate the type of fracture produced at 24 h and at 6 months.
Methods: 20 monoradicular teeth, crowns were cut and endodontic treatment of the root (AH plus® Dentsply De Trey, Germany and gutta-percha Kerr, Germany) w...
Objectives: The aim of this study was to evaluate “in vitro” the regional bond strength using Push-out test, after 24 hours and six months of storage, in different thirds of the root canal (cervical, middle and apical), after endodontic treatment and glass fiber posts Voco® luted with self adhesive Voco® and resin cement core•X™ flow, (Dentsply Cor...
To measure the demineralization capacity of 37% phosphoric acid and shear bond strength (SBS) of brackets attached on bovine enamel at different times after bleaching with 30% hydrogen peroxide.
Four equally-sized pieces of each crown from 18 bovine incisors were randomly distributed among 7 groups (n = 10). After bleaching with 30% hydrogen peroxi...
We report a case of nonendodontically treated first upper premolar crown root fracture in which the palatal cusp fracture extended below the cementoenamel junction. Reattachment of the palatal cusp in its original position by acid-etch and flowable composite allowed the creation of a standard access opening as in an intact tooth, avoiding apex loca...
Objectives:
We have investigated in detail the evolution of the chemical composition of bovine enamel during phosphoric acid induced demineralization.
Materials and Methods:
We used for this study powdered bovine enamel as starting material in order to have a more reactive and homogeneous material. We immersed the enamel samples in diluted ph...
The aim of the study was to determine the interfacial morphology and bond strength of three current self-etching adhesives (SEAs) to primary dentin and to evaluate the effect of introducing an additional step of phosphoric acid etching. Three human primary molars were assigned to each adhesive group for testing microtensile bond strength (microTBS)...
To evaluate dentin wettability and bonding of self-etching and total-etch adhesives on smear layer-covered and smear layer-free dentin.
Three self-etching adhesives (Clearfil SE Bond, AdheSE and Xeno III) and one total-etch adhesive (SingleBond) were evaluated. The substrates were mid coronal smear layer-covered and smear layer-free dentin. Dentin...
To evaluate and compare ex vivo the decalcifying effect of 15% EDTA, 15% citric acid, 5% phosphoric acid and 2.5% sodium hypochlorite on root canal dentine.
Two 2-mm-thick slices were cut from the coronal third of the root of 10 human incisors. Each slice was sectioned into two equal parts. Specimens were assigned to one of four groups (n = 10) for...
The aim of this study was to measure the demineralization capacity of 37% phosphoric acid on bovine enamel at different time-points after bleaching with 30% carbamide peroxide. Five, 4 x 4-mm sections were obtained from the enamel of 10 bovine incisors. After applying 30% carbamide peroxide (Vivastyle) for 90 min, specimens were stored in artificia...
https://iadr.confex.com/iadr/pef08/techprogram/abstract_111011.htm
To compare regional bond strength in different thirds of the root canal, among glass fiber-reinforced (FRC) endodontic posts luted with different cements, using the push-out test.
Sixty extracted human anterior teeth were endodontically treated with gutta-percha and AH Plus sealer. The crown portion was removed, and a dowel space was prepared. Prep...
Using the push-out technique, this study compared the influence of different composite insertion techniques in Class I cavities on the regional shear bond strength to lateral walls.
Standardized Class I cavities were prepared on the occlusal surface of 60 freshly extracted third molars, which were randomly assigned to one of five groups (n = 10). T...
To assess the efficacy of two sealants to preserve the apical seal after root canal preparation and cementation of posts at 24 h or 72 h after endodontic treatment.
Sixty human single-root teeth were instrumented and obturated using lateral compaction technique with EndoFill [30] or AH-Plus) [30] and were prepared in one of three ways, leaving a 3...
To measure in vitro the cuspal deflection produced by polymerization shrinkage and occlusal loading in mesio-occlusal (MO) and mesio-occlusal-distal (MOD) bonded composite restorations.
Twenty first premolars were studied, attaching a small crystal ball to each cusp vertex as a reference point for intercuspal distance measurements. MO cavities were...
The present study examines the influence of cavity type, and size of composite restorations on cuspal flexure due to polymerization shrinkage.
Thirty healthy premolars were selected and divided into two experimental groups. Group 1: Mesial, mesio-distal, and MOD cavities were successively prepared in each tooth by means of the SONICSYS approx syste...
To determine the influence of different etching times (5, 15 or 30 s) on the morphology and micro-tensile bond strength (muTBS) of primary dentin.
For muTBS study, nine primary molars were randomly distributed in three experimental groups. Three Class I cavities per tooth were drilled and etched (37% orthophosphoric acid gel for 5, 15 or 30 s). Exc...
The objective of this study was to measure the demineralization capacity of 10% and 20% citric acid and 17% EDTA after three time periods and to determine whether it was modified by the addition of 1% of commercial chlorhexidine (CHX). Three slices of 2-mm thickness were cut from the cervical third of the root of ten bovine incisors and sectioned i...
Clinical Relevance
The use of an individualized wedge with resin allows proximal contours to be reproduced and an adequate contact point to be obtained in Class II composite esthetic restorations.
Clinical Relevance
The progressive elimination of dental tissue, especially removal of marginal ridges and dentin above the pulp chamber and application of increasing occlusal loads, were related to a higher cuspal deflection.
This article presents the long-term follow-up of a female patient who suffered pulp exposure during removal of a large caries lesion from the mandibular right first molar. The clinical decision to perform direct pulp capping was made. The tooth was treated with 5% chlorhexidine, etched with 37% phosphoric acid, and then restored with Heliomolar com...
Coronal leakage can produce contamination of periapical tissues, resulting in endodontic failure.
The purpose of this in vitro study was to evaluate the ability of 2 sealers to prevent coronal leakage in canals filled with gutta-percha and prepared for cast dowels but without coronal sealing.
The crowns of 60 extracted single-rooted teeth were ampu...
This case report describes the use of orthodontic traction to recover soft tissue lost around a maxillary right central incisor with major external root resorption associated with severe gingival recession. Traction of the residual root for 1 month produced a gingival appearance in harmony with the adjacent teeth. After the placement of an implant,...
Cuspal deflection produced by polymerization shrinkage was measured after using different composite restoration techniques. This study included 30 healthy premolars embedded in acrylic resin connected to a system that simulated intrapulpal pressure. A small ball was attached to each cuspal vertex as a reference point for intercuspal distance measur...
To measure the demineralization capability of 1 and 10% citric acid, 10% sodium citrate and 17% EDTA during immersions of 5, 10 and 15 min on root canal dentine.
Crowns were sectioned from eight maxillary canines. The cementum was removed from the cervical third of the roots to expose the dentine. Canals were prepared using a handpiece-mounted Larg...
The aim of this article is to present and relate the different ways of diffusion of the white spot lesion, its deepness, geometry and peaks of progression. Materials and Method: In the study we used 27 human teeth containing white spot lesions on their free surfaces; the specimens were prepared for visualization under a polarized light microscopy....
Some clinical situations may require the repair of a secondary polymerized or aged composite. The higher indirect resin conversion rate may prove to be a disadvantage if a repair procedure based on covalent bonding from unreacted methacrylate groups is attempted.
This study evaluated the effectiveness of different combinations of surface treatments...
In this current piece of work we study the area of dentinal diffusion obtained with various irrigating agents which eliminate the smear layer: critic acid at concentrations of 10, 25 and 50%, 15% ethylene-diamino-tetraacetic acid (EDTA), and REDTA (compound of EDTA). All the agents proved their efficiency in eliminating the smear layer, which was c...
The effectiveness of ultrasonic and sonic instrumentation in eliminating the smear layer from instrumented root channels. The results were examined with S.E.M. and the effective areas of dental diffusion were calculated using the computerized image analyzer. The agents used: citric acid at concentrations of 10, 25 and 50% as well as 15% EDTA, prove...
It's been studied "in vitro" the influence of the "Smear Layer" on the cement adhesión of the glass ionomer to the dentin. Using phosphoric acid at 37% and poliacrylic in the dentin during short periods of time, the adhesion between the cement and the dentin is improved because the Smear Layer is removed totally in the case of phosphoric acid and p...
It has been studied the gingival microleakage and the polymerization contraction gap in composites class II restorations. The influence of two different composites, a microparticle [Heliomolar (Vivadent)] and a high filled one [P-50 (3M)], has been compared with different adhesion systems: a) gingival enamel acid-etch technique. b) Dentinal adhesiv...
Objective: To assess the efficacy of two sealants to preserve the apical seal after root canal preparation and cementation of posts at 24 h or 72 h after endodontic treatment. Study design: Sixty human single-root teeth were instrumented and obturated using lateral compaction technique with EndoFill® (30) or AH-Plus® (30) and were prepared in one o...
Reducción alta Univ. de Granada. Departamento de Biología Celular. Leída en 1990
Projects
Project (1)
Abstract
OBJECTIVES:
To investigate the bond strength and seal ability produced by AH Plus/gutta-percha, EndoREZ and RealSeal systems to root canal dentin.
MATERIAL AND METHODS:
Sixty extracted single-root human teeth, instrumented manually to size 40, were divided into three groups (n=20) according to the sealer used; G1: AH Plus, G2: EndoREZ, and G3: RealSeal sealers. After filling using the lateral condensation technique, each sealer group was randomly divided into two subgroups according to the tests applied (n=10 for µPush-out test and n=10 for fluid filtration test). A fluid filtration method was used for quantitative evaluation of apical leakage. Four 1-mm-thick slices (cervical and medium level) were obtained from each root sample and a µPush-out test was performed. Failure modes were examined under microscopy at 40x, and a one-way ANOVA was applied to analyze the permeability. Non-parametrical statistics for related (Friedman's and Wilcoxon's rank tests) or unrelated samples (Kruskal-Wallis' and Mann-Whitney's tests) allowed for comparisons of µPush-out strength values among materials at the different levels. Statistical significance was accepted for p values <.05.
RESULTS:
There are no significant differences among fluid filtration of the three sealers. The sealer/core material does not significantly influence the µPush-out bond strength values (F=2.49; p=0.10), although statistically significant differences were detected with regard to root level (Chi2=23.93; p<0.001). AH Plus and RealSeal obtained higher bond strength to intraradicular dentin in the medium root slices.
CONCLUSIONS:
There are no significant differences between the permeability and global µPush-out bond strength to root canal dentin achieved by AH Plus/gutta-percha, EndoREZ and RealSeal systems.