Maria Eugenia Guerrero
@unmsm.edu.pe
Medico Surgical Stomatology
Universidad Nacional Mayor de San Marcos
Dr. Maria Eugenia Guerrero is working as full professor at Universidad Nacional mayor de San Marcos in Lima, Perú. Dr. Guerrero graduated as a dentist at Saint Mary Catholic University in Perú. In 2004 she won the Belgian Technical Cooperation grant and travelled to Belgium to perform a Master in Medical Sciences. She was an ITI Scholar at the University of Geneva, Switzerland. She further received the Interfaculty Council for Development Co-operation (IRO, KU Leuven) grant to continue her PhD studies at the Oral Imaging Center and the OMFS IMPATH research group (Oral & Maxillofacial Surgery – Dept Imaging and Pathology) at the KU Leuven. Her research interests include Oral Imaging, Periodontics and Dental Implants
RESEARCH INTERESTS
Cone-beam CT, dental implants, Periodontology, third molar
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
José Rosas-Díaz, Maria Eugenia Guerrero, Nancy Córdova-Limaylla, Maisely Galindo-Gómez, Marco García-Luna, and César Cayo-Rojas
MDPI AG
Background: This study aimed to evaluate the primary stability, according to the insertion torque value (ITV) and resonance frequency analysis (RFA), of dental implants placed in standardized blocks of bone quality equivalent to type II-A bone, using three surgical undersized protocols of 0.2 mm, 0.5 mm, and 0.8 mm, considering different dental implant diameters and lengths. Methods: One hundred and twenty dental implants (DIs) of different diameters (3.5, 3.8, 4.5, and 5.0 mm) and lengths (8.5, 10.0, 11.5, 13.0, and 15.0 mm) placed in polyurethane blocks equivalent to type II-A bone, according to the Lekholm and Zarb classification modified by Rosas et al., were examined with three surgical protocols of under-milling of 0.2, 0.5, and 0.8 mm. The ITV and the RFA were the determinants of primary stability, and their respective values were recorded as Ncm and the implant stability quotient (ISQ) immediately after the placement of the DIs. These were evaluated according to each surgical insertion protocol, length, and diameter of the DI under a multivariate analysis model (MANOVA). Statistical significance was set at p < 0.05. Results: It was observed that the average of the ITV was significantly higher when a 0.8 mm under-milling protocol was used (63.2 ± 14.9 Ncm) (p < 0.001). However, the ITV was significantly lower when a 0.2 mm under-milling protocol was used (25.1 ± 8.3 Ncm) (p < 0.001). On the other hand, the ISQ did not present significant differences (p = 0.166) when comparing the 0.2 (67.6 ISQ ± 5.4 ISQ), 0.5 (65.8 ISQ ± 3.4 ISQ), and 0.8 (65.7 ISQ ± 4.0 ISQ) under-milling protocols in the evaluation of the primary stability of the dental implant. The multivariate effect size (ηp2 = 0.639) indicated that the variability detected in the insertion torque and the ISQ, at the same time, was explained by 63.9% (p < 0.001) due only to the compression protocol, while the implant diameter explained this variability by 27.0% (ηp2 = 0.270) (p < 0.001) and the implant length only significantly explained this variability by 12.1% (ηp2 = 0.121) (p = 0.030). Finally, any interaction between the compression protocol, implant diameter, and length did not influence insertion torque variability or the ISQ (p > 0.05). Conclusions: It can be concluded that when the surgical protocol for subpreparation is optimal according to the prepared bone bed, regardless of the diameter or length of the dental implant used, primary stability was assured according to the ITV and the RFA in 63.9%. This finding allows us to recommend carrying out a correct analysis of bone quality in order to subsequently select the most appropriate surgical protocol for the subpreparation of the bone bed to achieve better primary stability of the dental implant.
José Rosas-Díaz, Maria Eugenia Guerrero, Diana Castillo-Andamayo, Maisely Galindo-Gómez, Marco García-Luna, Luis Cervantes-Ganoza, and César Cayo-Rojas
Springer Science and Business Media LLC
Allisson Zarate-Reyes, Yris Chavez-Lazo, Maria Eugenia Guerrero, Novaldy Wahjudianto, and Dian Agustin Wahjuningrum
Elsevier BV
Jesus Cabanillas, Ruth Risco, Arnaldo Munive-Degregori, Maria Eugenia Guerrero, Franco Mauricio, and Frank Mayta-Tovalino
Medknow
Abstract Aim: This narrative review aimed at identifying the existing scientific literature investigating periodontitis and neuropathic diseases. Materials and Methods: A search of the literature published between 2000 and 2022 was carried out in the electronic databases of Scopus and PubMed. Studies in which the eligible articles were mainly published in English were included. Descriptive correlational studies, case–control studies, comparative studies, and cohort studies were also included. The following main keywords were used: “Neuropathic diseases,” “Periodontitis,” “Alzheimer’s disease,” and “Porphyromonas gingivalis.” Results: This narrative review found that cognitively impaired persons with severe periodontitis had a higher prevalence and incidence of periodontal diseases than the rest of the population. A significant positive correlation of salivary interleukin (IL)-1beta and immediate recall scores involved in cognition was also evident. It indicates that the most investigated parameter was whether there is any common link between periodontal disease and neurodegeneration. No randomized controlled clinical studies were found in the current literature review. Conclusions: Based on the literature reviewed, there is currently no strong scientific evidence to support or discourage the cause–effect relationship of periodontal diseases and neurodegenerative diseases.
José Rosas-Díaz, Maria Eugenia Guerrero, Maisely Galindo-Gómez, Marco García-Luna, Edwin Espinoza-Figini, and César Cayo-Rojas
Medknow
Abstract Among the immediate complications that can occur after dental implant placement, accidental displacement within the medullary spaces of the mandibular body is a rare clinical situation. This case report describes implant displacements in the posterior mandibular region and emphasizes the importance of assessing bone density and mandibular medullary patterns prior to implant placement according to a new classification by Lekholm and Zarb modified by Rosas et al. The case reports reported three implant displacements in type II bone of the mandibular body, as classified by Lekholm and Zarb. Following the complication, the bone was reclassified as II-B according to the modification by Rosas et al. The implants were extracted from three female patients aged from 37 to 75 years, with only one having a medical history. All complications were treated and resolved without any alteration after implant removal. To reduce the risk of intraoperative complications that affect the primary stability of dental implants, such as implant migration in the mandibular body, it is important to consider factors that may affect the mechanical locking of the implant at the time of placement, such as the pattern and thickness of the bony trabeculae and the size of the medullary spaces in areas of anatomical risk. For this purpose, we recommend using the modified Lekholm and Zarb classification by Rosas et al. This classification considers the trabecular bone biotype, which helps in planning the surgical approach procedure and establishing a regenerative protocol to minimize the risk of complications with the inferior dental nerve.
Miguel Cabanillas-Lazo, Carlos Quispe-Vicuña, Milagros Pascual-Guevara, Maria Eugenia Guerrero, John Barja-Ore, Fran Espinoza-Carhuancho, and Frank Mayta-Tovalino
Medknow
Abstract Objective: To perform a bibliometric analysis of the scientific production related to intestinal microbiota and bariatric surgery between January 2016 and December 2022. Materials and Methods: A bibliographic search was performed in the Scopus database to identify published papers. Free and controlled terms (MeSH and Emtree) were used. The information collected was analyzed with SciVal. Results: A total of 518 published papers were included in the analysis. Carel Le Roux was the author with the highest scientific production; however, Edi Prifti had the highest impact. French National Institute of Health and Medical Research (Institut national de la santé et de la recherche médicale) was the institution with the highest number of published articles. Six of the 10 institutions with the highest production were in France, yet the United States had the highest volume of scientific production in this research topic. Most papers were published in first quartile journals. Articles with international collaboration had the highest impact. There is a sustained increase in the number of publications since 2019. Conclusions: The study found that the vast majority of research on gut microbiota changes following bariatric surgery are conducted in the United States and European countries. In addition, the sustained increase in production coupled with the articles being published in high-quality journals and having good citation impact are indictors of the current interest in this research field.
José C. Rosas-Díaz, Nancy E. Córdova-Limaylla, Jerson J. Palomino-Zorrilla, Maria E. Guerrero, Rubén Carreteros, Luis A. Cervantes-Ganoza, and César F. Cayo-Rojas
Medknow
Abstract Aim: We propose a modified Lekholm and Zarb classification that considers all possible combinations of cortical and cancellous bone to provide parameters that favor greater repeatability and reproducibility. Materials and Methods: This observational and analytical study consisted of a sample of 50 cone beam computed tomography (CBCT) scans. Two new types (V and VI), three subtypes to type II (II-A, II-B, and II-C), and two subtypes to type III (III-A and III-B) were added to the original bone quality classification. The new types refer to regenerated bone (type V) and bone with some pathology (type VI). The subtypes are described as type II-A: thick cortical surrounding the abundant cancellous bone with sharp trabeculae throughout the image and presence of small and visible medullary spaces; type II-B: thick cortical surrounding the abundant cancellous bone with predominance of diffuse trabeculae in the basal bone and predominant presence of wide and visible medullary spaces; type II-C: thick cortical surrounding the abundant cancellous bone with predominance of very thick and sharp trabeculae in the basal third as well as presence of small and visible medullary spaces; type III-A: thin cortical surrounding the abundant cancellous bone with sharp trabeculae throughout the image and presence of small and visible medullary spaces; type III-B: thin cortical surrounding the abundant cancellous bone with predominance of diffuse trabeculae and presence of diffuse medullary spaces. Five dental specialists were trained in the use of the modified classification and were provided with CBCT-sectioned images of edentulous jaws for classification. Each specialist classified the images twice at a 7-day interval. The strength of intra-examiner and inter-examiner agreement was measured with Cohen’s and Fleiss’ kappa index, respectively. In addition, the agreement between both classifications was analyzed. All data were analyzed at a 95% confidence level, considering a P-value <0.05. Results: According to the modified Lekholm and Zarb classification, an almost perfect intra-examiner agreement was significant (P < 0.05) in all five specialists, with the kappa index [k] ranging from 0.91 [95% confidence interval (CI): 0.82–0.99) to 0.95 (95% CI: 0.89–1.00). Furthermore, substantial inter-examiner concordance (k=0.76; 95% CI: 0.73–0.79) was significant (P < 0.05). Conclusion: The high repeatability and reproducibility of the modified Lekholm and Zarb classification on CBCT suggest its applicability to distinguish between the various combinations of cortical and cancellous bone and help to define treatment appropriately to optimize results.
Jerson Jimmy Palomino-Zorrilla, Nancy Edith Córdova-Limaylla, José C Rosas-Díaz, César F Cayo-Rojas, Luis A Cervantes-Ganoza, and Maria E Guerrero
Medknow
Abstract Aim: Cone beam computed tomography has become an attractive method for implant planning. However, in most cases, not all the information is taken advantage of and often the radiographic evaluation of bone quality is based on subjective assessment by the individual clinician. Therefore, the aim of this study was to examine classifications of bone tissue characteristics and methods for assessing them in dental implant planning and placement studies. Materials and Methods: Three databases (Pubmed, Scopus, Web of Science) were searched using specific index terms: “Bone quality, bone quantity, bone density, cone-beam CT and cone-beam computed tomography”. Three reviewers selected titles and analyzed abstracts according to inclusion and exclusion criteria. Some descriptions of bone tissue characteristics (bone quality, density, and quantity) used before or during dental implant placement were selected and categorized. Results: The search yielded 442 titles. A total of 32 articles were selected and read in full text. Seventeen articles were considered relevant. Different classification systems were found to evaluate bone tissue characteristics as well as different examination protocols. Thirteen publications included in this review reported on bone quality and quantity using the Lekholm and Zarb classification. However, only four studies implemented and/or proposed modifications of the Lekholm and Zarb system. Four other publications described bone quality according to different classification systems such as Misch, University of California Los Angeles (UCLA), or Trisi and Rao. The assessment methods were often briefly described (or not described at all in one publication). Of the articles analyzed, five presented observer performance, whereas three presented diagnostic accuracy of the assessment method. Conclusion: Currently, there are different classification systems applied to dental implant planning and placement, particularly regarding whether bone quality or quantity affects treatment outcomes. However, most authors have not validated the diagnostic accuracy and reproducibility of the classification used. Therefore, it is necessary to develop a classification system consistent with characteristics of bone tissue, taking into consideration an adequate description of bone tissue assessment methods, their diagnostic accuracy, and observer performance.
Carlos Quispe-Vicuna, Miguel Cabanillas-Lazo, Carlomagno Villarreal-Inca, Maria Eugenia Guerrero, John Barja-Ore, Abigail Temoche, and Frank Mayta-Tovalino
Medsci Publications
Background: COVID-19 has generated new gaps in knowledge, which in turn has had a significant impact on different areas of research, one of these being Reproductive Medicine. However, to date, no analysis of publications on this topic has been identified. Therefore, the aim of this study was to perform a bibliometric analysis of the worldwide scientific production of COVID-19 in Reproductive Medicine. Method: We conducted an advanced bibliographic search in the Scopus database to identify articles on COVID-19 and Reproductive Medicine from 2019 to May 2022. The collected data was analyzed with Scival software, and the results were presented through summary tables. Result: A total of 737 publications were collected and analyzed, of which 594 were original articles and 143 reviews. Leila V. Adamyan and Sechenov First Moscow State Medical University (Russia) were the most productive author and institution, respectively. The European Journal of Obstetrics, Gynecology and Reproductive Biology was the journal with the highest number of publications. In addition to that, we report a steady increase in the number of publications between 2020 and 2021, especially of articles published in first quartile (Q1) journals. Finally, although most of the publications had only national collaboration, the highest impact was found in those studies with international collaboration. Conclusion: The scientific production on Reproductive Medicine and COVID-19 has reported a steady increase in recent years, especially in Q1 journals, which evidences a special interest in the subject by the scientific community. However, since new articles on COVID-19 are constantly being published, we recommend future bibliometric analyses to better analyze the topic.
Edith Perez, Liliana Salinas, Roman Mendoza, Maria Eugenia Guerrero, Jose Oliva, and Frank Mayta-Tovalino
Medknow
Abstract Aims and Objectives: The aim of this study was to describe the mechanism of dental implants osseointegration in patients with congenital and degenerative genetic bone disorders. Materials and Methods: A PubMed and Scopus documents search was carried out between November 2021 in the, using words such as “osseointegration,” “degenerative disease,” “congenital disease,” and “dental implants.” Results: The thirteen articles selected dealt with dental implants osseointegration in patients with congenital and degenerative bone disorders. The influence and repercussion of these diseases on the bone system, as well as the osseointegration process were described from healing to bone remodeling. In addition, certain articles described some considerations to improve the osseointegration process in patients suffering from these types of conditions. Conclusions: Within the limitations of this literature review we can conclude that osseointegration in patients with ectodermal dysplasia and osteoporosis could be achieved. However, the planning process for dental implant placement in these patients should be more meticulous and individualized considering the degree of tissue involvement as well as the patient’s age and skeletal development compared to systemically healthy patients.
Paola Manrique, Andrés Agurto, and María Eugenia Guerrero
Universidad de Costa Rica
The purpose of this study was to compare the average distances from the root apices of the first molars, second molars, and second premolars to the mandibular canal according to sex in the Peruvian population using cone-beam computed tomography (CBCT). Eighty CBCT scans of Peruvian patients aged from 15-80 years were examined. After locating the mandibular canal, measurements of the vertical distances from the mandibular canal to the apices of the second premolars, as well as the first molars and second molars, were made. For the statistical analysis, Student’s t test was used for both paired and unpaired samples, with a significance level of p<0.05. On the right side, the second molar presented a mean distance of 3.99mm for males and 2.87mm for females, showing a significant difference (p<0.05). When compared bilaterally, no significant differences were found (p>0.05) between the distances from the apices of the second premolars and the first and second molars to the mandibular canal. However, for the second premolars and second molars on the left side, the values were higher, with averages of 5.52mm and 3.75mm, respectively.The mesial roots of the second molars were closer to the mandibular canal. In addition, women showed shorter distances than men.
Frank Mayta-Tovalino, John Barja-Ore, Yesenia Retamozo-Siancas, Alicia Fernandez-Giusti, MariaEugenia Guerrero, and Arnaldo Munive-Degregori
Medknow
Frank Mayta-Tovalino, Cristhel Juarez, Luis Langa, Roman Mendoza, MariaE Guerrero, and Jose Oliva
Medknow
Aim: The aim of this article is to describe the existing scientific literature on photodynamic therapy (PDT) effectiveness for peri-implantitis treatment. Materials and Methods: A date-restricted electronic search strategy was performed in PubMed and Scopus databases. The following words were used: “peri-implant photodynamic therapy,” “photodynamic therapy in implantology,” “effectives of photodynamic therapy in peri-implantitis,” “Antimicrobial Photodynamic Therapy,” “Photodynamic Therapy for the treatment of peri-implantitis,” and “Mechanical debridement and photodynamic therapy in implantology.”Results: Of the 15 articles, 13 articles were selected, of which 11 were prospective and experimental studies and 2 were longitudinal. The PDT effectiveness of peri-implantitis inflammation treatment was the most reported and investigated. Conclusion: There is scientific evidence that may support the use of PDT for peri-implantitis treatments. However, even more studies would still be needed to have solid evidence.
Frank Mayta-Tovalino, Carlos Quispe-Vicuña, Miguel Cabanillas-Lazo, Arnaldo Munive-Degregori, Maria Eugenia Guerrero, and Roman Mendoza
Elsevier BV
José Carlos Rosas-Díaz, Violeta Malpartida-Carrillo, Nancy Edith Córdova-Limaylla, Maria Eugenia Guerrero, Jerson Jimmy Palomino-Zorrilla, Luis Adolfo Cervantes-Ganoza, and César Félix Cayo-Rojas
Medknow
Abstract Aim: Stability measured by resonance frequency analysis (RFA) is an important factor to be considered in the success of dental implant treatments, which can be evaluated from the implant stability quotient (ISQ). The aim of the present case series was to map the RFA during healing of implants with nanostructured hydroxyapatite surface to describe the behavior of ISQ values related to individual factors. Materials and Methods: Twenty-three implants were placed in eight patients by conventional surgical protocol, and ISQ values were monitored from the day of implant placement until week 20. To obtain the ISQ values, an Osstell device was used and the placed implants were grouped in proportional amounts to describe the ISQ behavior considering the length (≤10 or >10 mm), the diameter (3.5 or 4.3 mm), the insertion torque (<40 N-cm or ≥40 N-cm), and the placement area (maxilla or mandible). Results: All the implants assessed decreased their values in the first 3 weeks after placement. Subsequently, the ISQ values increased by amounts similar to those obtained at the time of the placement and even more. Implants with length >10 mm, diameter 4.3 mm, and insertion torque ≥40 N-cm showed the highest ISQ values. Conclusions: A decrease in the ISQ values of dental implants with nanostructured hydroxyapatite surface was evidenced between weeks 2 and 3 considering length, diameter, insertion torque, and maxillary or mandibular placement site.
Frank Mayta-Tovalino, Javier Puchuri-Lopez, Manuel Galvez-Sandoval, MariaE Guerrero, Arnaldo Munive-Degregori, Cesar Mauricio-Vilchez, and John Barja-Ore
Medknow
BACKGROUND: Healthcare workers are under significant constant stress as a result of the coronavirus disease 2019 (COVID-19) pandemic. The aim of this study, therefore, was to analyze bibliometrically the impact, trend, and characteristics of scientific production related to the mental health of health professionals during the COVID-19 pandemic. MATERIALS AND METHODS: A bibliometric analysis of the scientific production on the mental health of health professionals and COVID-19 in Scopus from December 2019 to December 2021 was performed. An advanced search was designed using Boolean operators in Scopus and applied in April 2022. The metadata was entered into Microsoft Excel for the elaboration of the tables, SciVal to obtain the bibliometric indicators, and VosViewer to plot collaborative networks. RESULTS: A total of 1393 manuscripts, 1007 of which met the eligibility criteria, were found on the mental health of health workers and COVID-19. The country with the highest academic production was the United States and Harvard University with 27 manuscripts as the most productive institution. The scientific journal with the highest scientific production was the International Journal of Environmental Research and Public Health with 138 manuscripts and 1580 citations, and the author with the most citations per publication was Carnnasi Claudia with 69.8. CONCLUSION: The countries with the highest economic income occupy the first places in scientific production on the mental health of health workers during the COVID-19 pandemic, with the United States as the leader. There is a gap in the scientific knowledge on the mental health of healthcare workers during the COVID-19 pandemic in middle- and low-income countries.
R. Alvarez-Medina, ME. Guerrero, NE. Córdova-Limaylla, LE. López-Llamosas, JL. Huamaní-Echaccaya, JJ. Palomino-Zorrilla, and JC. Rosas-Díaz
Medicina Oral, S.L.
Background The purpose was to evaluate the variation in thickness and early healing of the donor area of the palate with the placement of a collagen sponge and the use of fibrin-rich plasma (L-PRF). Material and Methods Thirty patients who required mucogingival surgery treatment were selected and distributed into 2 groups. After obtaining the free palate graft, L-PRF was placed in Group A, and a collagen sponge was placed in Group B. The healing process of the palate was evaluated at 24 hours and 7, 14, 21 and 28 days postsurgery. The thickness of the donor area (palate) was evaluated using an acrylic splint. These measurements were made before and 4 months after surgery. Results In the collagen sponge group, less gain of the palatal mucosa was observed, with a mean difference of 0.1 ± 0.8 mm (CI: −0.341–0.518) (p=0.691), whereas in the fibrin-rich plasma group, a mean difference of 0.0 ± 0.5 mm (CI: −0.229–0.229) (p=0.934) was found; however, when comparing the gain of the palatal mucosa in both groups, no significant difference was observed (p=0.932). The healing index at 24 hours indicated the presence of clots, on Day 28 vascularisation and total epithelialisation (100.0%), and finally, the collagen sponge group on Day 14 presented 93.3% partial vascularisation of connective tissue and 33.3% L-PRF (p=0.001). Conclusions There was no statistically significant difference in the thickness of the palatal mucosa after the use of L-PRF and the collagen sponge. Key words:Palate thickness, connective tissue graft, fibrin-rich plasma, collagen sponge, palate healing.
Frank Mayta-Tovalino, Carlos Quispe-Vicuna, Miguel Cabanillas-Lazo, John Barja-Ore, Cesar Mauricio-Vilchez, MariaEugenia Guerrero, and Arnaldo Munive-Degregori
Medknow
Frank Mayta-Tovalino, Arnaldo Munive-Degregori, Silvia Luza, FlorC Cárdenas-Mariño, MariaEugenia Guerrero, and John Barja-Ore
Medknow
Frank Mayta-Tovalino, Josmel Pacheco-Mendoza, Daniel Alvitez-Temoche, Juan Alvítez, John Barja-Ore, Arnaldo Munive-Degregori, and Maria Eugenia Guerrero
Elsevier BV
Frank Mayta-Tovalino, Alicia Fernandez-Giusti, Cesar Mauricio-Vilchez, John Barja-Ore, Maria Eugenia Guerrero, and Yesenia Retamozo-Siancas
Elsevier BV
Carlos Quispe-Vicuña, Miguel Cabanillas-Lazo, Maria Eugenia Guerrero, Franco Mauricio, John Barja-Ore, and Frank Mayta-Tovalino
Elsevier BV
Frank Mayta-Tovalino, Miguel Cabanillas-Lazo, Carlos Quispe-Vicuña, Milagros Pascual-Guevara, John Barja-Ore, MariaEugenia Guerrero, and Arnaldo Munive-Degregori
Medknow
Background: Tuberculosis is one of the leading causes of death worldwide affecting mainly low- and middle-income countries. Therefore, the objective is to analyze the bibliometric characteristics of the application of artificial intelligence (AI) in tuberculosis in Scopus. Methods: A bibliometric study, the Scopus database was used using a search strategy composed of controlled and free terms regarding tuberculosis and AI. The search fields “TITLE,” “ABSTRACT,” and “AUTHKEY” were used to find the terms. The collected data were analyzed with Scival software. Bibliometric data were described through the figures and tables summarized by absolute values and percentages. Results: Thousand and forty-one documents were collected and analyzed. Yudong Zhang was the author with the highest scientific production; however, K. C. Santosh had the greatest impact. Anna University (India) was the institution with the highest number of published papers. Most papers were published in the first quartile. The United States led the scientific production. Articles with international collaboration had the highest impact. Conclusion: Articles related to tuberculosis and AI are mostly published in first quartile journals, which would reflect the need and interest worldwide. Although countries with a high incidence of new cases of tuberculosis are among the most productive, those with the highest reported drug resistance need greater support and collaboration.