Browsing by Author "Siguencia Cruz, Valeria del Rosío"

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Análisis de los cambios producidos en el espesor y altura del cuerpo mandibular después de la utilización de aparatología Herbst y Advansync en pacientes Clase II esqueletal por medio de Tomografía Computarizada de Haz Cónico (CBCT
(2018) Ramírez Cabrera, Silvia Cumandá; Siguencia Cruz, Valeria del Rosío
The computed tomography and the generation of three-dimensional images has allowed to improve the quantitative and qualitative assessment of bone changes generated at the mandibular region when using certain appliances, the aim of the present work was to compare the effectiveness of the use of Herbst and Advansync in promoting changes in the thickness and height of the mandibular body in skeletal class II patients using cone beam computed tomography. The research was developed with 29 subjects, who were randomly divided into two groups: "Advansync" and "Herbst". Two CBCT records pre-treatment and post-treatment with a 10-month interval were taken, of each record a three-dimensional image was generated in which the different measurements were made. In addition the jaw segmentation, superposition and fusion were performed for the qualitative evaluation of bone changes. The normality test for small Shapiro Willk samples was performed, which showed a normal behavior in the before and after (p> 0.05), T Student test was applied for related samples, and in the registered differences varied behaviors resulted, therefore, the T-Student test was executed for independent samples in those measures with normal behavior (p> 0.05) and the U-Mann Whitney test for those that had non-normal behavior. (p <0.05). In general there is no significant difference in the number of success cases between both groups, although the group with Advansync had better results
Correlación entre el biotipo facial clínico y cefalométrico como elementos de diagnóstico en Ortodoncia
(2016) Pérez Yánez, María Belén; Siguencia Cruz, Valeria del Rosío
Facial Biotype is of great importance to establish a treatment plan and it can be determined clinically and radiologically. It is classified into three kinds: Mesofacial, Dolichofacial and Brachyfacial. Once the biotype is identified, it is important to know what malocclusion is associated to, and its muscular and osseous characteristics in order to offer the correct treatment. The aim of this study was to find the correlation between clinical and cephalometric biotype measured in the same patient. The study was conducted in 50 students from the "Facultad de Odontologia de la Universidad de Cuenca" between the ages of 18 and 25 years, both male and female. Radiological images were taken by the same operator with orthopantografo CDRPan X Schick Sirona with a cephalometric system of type 80-13, year 1981, the film was exposed to 68-70 kv and 12mA with an equivalent aluminum filter at 2 to 5 mm and with normal head position. The clinical measure taken in the same position was conducted with a 1x1000 in calibrator SOYODA. Chi Cuadrado and V de Crammer tests were used to stablish the level of correlation. The results indicate that there is a moderate correlation only. Therefore it is concluded that one can not only trust the physical characteristics or the subjective analysis of the patients, but it is necessary to analyze one and each case together.
Eficacia de los métodos de reacondicionamiento de los brackets en relación a su resistencia a la tracción. Estudio in vitro
(2016) Ochoa Barros, Paola Elizabeth; Siguencia Cruz, Valeria del Rosío
The Effectiveness of reconditioning methods of the brackets in relation to their tensile strength"Study in vitro" Reconditioning of brackets is an alternative that brings benefits to the orthodontic practice. Therefore the purpose of this study was to determine the resistance to tensile force; of the reconditioning methods, for this purpose the Universal tensometer Z005 series 157864 (Zwick / Roell, BE, Germany) was used; with the same that was conducted the vitro study; The results obtained showed which one presented greater resistance. The research was conducted with a total of 90 samples, divided in 3 groups of 30 respectively. The results of the tensile test were as follows: group 1 (new brackets) was the group that had higher resistance to tensile force with an average of 11.32, with a low standard deviation of 10.51 and a maximum standard deviation of 12.26MPa, group 2 (sandblasted brackets) had a resistance to tensile force of 8.36 with a minimum standard deviation of 7.20 and a maximum standard deviation of 9.49MPa, and group 3 (flamed brackets) had the lower resistance to force traction of 4.73 with a minimum of 3.37 standard deviation and a maximum standard deviation of 5.84MPa. Resistance tensile force of new and reconditioned brackets showed different data in each group that were statistically significant, with a p-value ≤ 0.05 and showed that the group of sandblasted brackets is the most resistant to the tensile force concerning the two methods of reconditioning, but none of the investigated reconditioning methods is similar or exceeds the values reported by new brackets.
Estudio comparativo entre los métodos de moyers, tanaka y jhonston con respecto al índice de melgaco para la predicción de los anchos mesio distales de los caninos y premolares mandibulares en 94 modelos de pacientes de la Clínica de Ortodoncia de la Universidad de Cuenca
(2016) Espinosa Torres, Christian Orlando; Siguencia Cruz, Valeria del Rosío
The Estimate of the mesiodistal diameters of canines and premolar mandibular is an important aspect for the analysis of the mixed dentition. The rates applied globally are Moyers and Tanaka – Johnston, actually, Brazilian researchers develop a new way use two equations, one for men and other for women, and it integrates size of the 1st molar permanent mandibular. The present research ask to define what method is the most accurate for calculate the mesiodistal diameters of canines and premolar mandibular. Were analyzed 94 models of study, 41 men and 53 women, on ages around 12 and 31 years old, the sample was choose convenience, was measured all the teeth from the 1st left molar mandibular permanent to the 1st right molar mandibular permanent with a digital caliper Mitutuyo. The correlation between the values obtained for the different indices and the real values was estimated for Pearson’s test. The comparisons between real and obtained values were realized with Wilcoxon’s proof. Additionally the student’s test served for realizes comparisons of real values with regard to sex and mediarcada. The three methods has a positive correlation statistically significant with regard to real value (p=0.000), While Melgaco’s system presented a higher rank of correlation (R=0.735). The three indices show differences statically significant with regard to real value (p=0.000), all were higher values than the mesiodistal diameters real and canines and premolar. Didn’t exist differences statically significant between right and left side (p=0.6). Referring to sex didn’t find differences statically significant on right side (p=0.15), while on left side noted this differences (p=0.04). Based to these results, it concludes that Melgaco’s system is the most attached to our population
Estudio in vitro de la resistencia a la tracción de tres tipos de resinas fotopolimerizables para ortodoncia, en brackets metálicos a esmalte dental humano
(2013) García Pacheco, Carlos Andrés; Siguencia Cruz, Valeria del Rosío
The purpose of this study was to determine the tensile strength of three light-cured bonding materials for metal orthodontic brackets to tooth enamel. The work included 60 samples divided into three sets of 20 teeth and subjected to tensile using the force universal tensometer Zwick Roell Z005, recording the following results: Group GrenGloo with an average of 7.57 MPa is the highest resin tensile strength, followed Transbond XT resin with an average of 7.44 MPa and finally Heliosit resin with an average tensile strength of 6.98 MPa. We used ANOVA to establish differences between the 3 groups of resins. Conclusion: The tensile strength of metal brackets cemented to human dental enamel with three resins types , showed different results in the three groups but these were not statistically significant as resin having greater tensile the GrenGloo group followed by Transbond XT and Heliosit
Evaluación de la reabsorción radicular externa apical por medio de CBCT en pacientes clase II tratados con Herbst y AdvanSync
(2018) Pando Bacuilima, Karina Andrea; Siguencia Cruz, Valeria del Rosío
The aim of this study was to analyze the degree of apical external root resorption (RREA) in the incisors of patients with different mandibular reposition appliances: Herbst and AdvanSync®. The sample consisted of 28 patients, included the patients between 11 and 17 years, who were randomly divided in 2 groups aged between 11 and 18 years, who were randomly divided into 2 groups: Herbst group (n = 13, 12 men, 1 woman) and AdvanSync® group (n = 15, 10 men, 5 women ). The analysis was over 224 dental pieces (upper and lower incisors) by using cone beam computed tomography. The data obtained were subjected to two statistical tests, a qui-square was used to determine the association between the device and apical external root resorption. Likewise t Student and U Mann-Whitney U tests were used to determinate whether or not there was a statistical significant difference between these two devices, regarding the amount of root resorption. The results indicate a tendency of a smaller amount of resorption for the AdvanSync® group without a statistical significant difference between these appliances. It is concluded that there was no a significant correlation between root resorption and type of mandibular reposition appliances.
Evaluación de los cambios esqueléticos y dentoalveolares de acuerdo a la cefalometría de Pancherz en pacientes con maloclusión clase II tratados con aparatología advansync & herbst en la clínica de ortodoncia de la Universidad de Cuenca – prueba clínica controlada aleatorizada
(2018) Gavela Guamán, Andrea del Cisne; Siguencia Cruz, Valeria del Rosío
OBJECTIVE: The objective of the present investigation was to evaluate the skeletal and dentoalveolar changes produced by the Herbst and Advansync appliances, as a class II malocclusion treatment. MATERIALS AND METHODS: Randomized prospective longitudinal cohort study, 30 individuals, divided into two groups ADVANSYNC (n = 15), Herbst (n = 15) of female and male with ages ranging from 11 to 18 years of age, treatments with the two appliances started and ended in the same period (10 months), evaluating the results through initial and final radiographic studies. The data were processed in the Dolphine 11.3 cephalometric program, by Pancherz cephalometry. RESULTS: In the statistical analysis the F-Fisher test was used for homogeneous variances. No significant statistical differences were observed between the T1 and T2 averages of the OLp-A, OLp-M, and OLp-I S variables (p> 0.05). On the other hand, the OLp-Pg variable presented significant differences and the variables OLp-M, OLp-I, Overjet and Molar Relatioship showed very highly significant differences between the two treatment times (p <0.001). The average percentage change of overjet with respect to the initial value was 77.8% (-5.2 mm) with the Advansync treatment and 85.5% (-6.4 mm) with the Herbst apparatus, while for The molar ratio percentages were 52.6% (-5.7 mm) and 59.2% (-6.4), respectively. CONCLUSIONS: No statistically significant differences were found between the two devices, when evaluating the skeletal and dentoalveolar changes produced in the period of time determined for the treatment of class II malocclusion, however it was observed that the Herbst device presents more favorable conditions in comparison of the Advansync device
Evaluación del esmalte dentario después de remover la resina residual posterior al descementado de brackets a través de dos tipos de sistemas
(2013) Herrera Gonzalez, Gerardo Rafael; Siguencia Cruz, Valeria del Rosío
An orthodontist should complete a patient’s treatment of oral tissues in optimal health conditions. The purpose of this study was to determine whether post treatment damage had occurred subsequent to polishing after debonding brackets. The study involved 60 extracted premolars, divided into two groups of 30, called A and B, in which high-speed tungsten-carbide bur (12-blades) were used for Group A, followed by the use of sof-lex discs, and low-speed tungsten-carbide bur (12-blades) followed by sof-lex discs were used for Group B. All teeth were examined in three stages, the first, prior to bracket placement, the second, after debonding, and the third stage, the final polishing of the enamel. The degree of damage to the enamel was determined by EDI and ARI, which were analyzed through a Microstar F1 microscope, model series OM 100 OM100F1R00008031100, as well as a PROCAM Power Supply camera, series HC220RX110110117, and through an endoDIGI software, series EN1022R0008031100 (ECLERIS). The Friedman Test, chi square, and Fisher Test was conducted to determine whether or not there were any significant differences between both groups. The following results were obtained: the use of high-speed tungsten-carbide bur had significantly increased the damage, which had in turn added to the risk of polishing damage by 2.47 over the use of low-speed tungstencarbide bur, (95% CI 1.55 to 3.94). In conclusion, the most effective polishing system is achieved with low speed tungsten-carbide bur
Stability of nonsurgical treatments in anterior open bite: narrative review
(Universidad de Cuenca, 2023-07-31) Guamán Camacho, Magaly Judith; León Gallardo, Gabriela Estefanía; Siguencia Cruz, Valeria del Rosío
The stability of orthodontic treatments depends on several factors, for example, skeletal pattern, type of movement performed, retention protocol, and habit control. It suggests that the stability of anterior open bite correction in adult patients is not exempt from this phenomenon, presenting a high relapse rate mainly in the first post-treatment year. This review aimed to compare the stability between different non-surgical orthodontic treatment alternatives to correct this malocclusion in adult patients. A search was carried out in digital databases on this subject, such as: LILACS, MEDLINE, Google Scholar, Scopus, ScienceDirect, JCU Library's One Search and PubMed. Selection criteria were applied to the articles obtained, giving us forty articles with different non-surgical therapeutic approaches to analyze in our study. It allows us to indicate that positive overbite is maintained in the long term after correction of anterior open bite with skeletal anchorage due to effective intrusion of the molars and significant changes in the soft tissue profile and skeletal pattern