Frecuencia de perforaciones radiculares en tratamientos endodónticos realizados por estudiantes de postgrados chilenos

Introducción: Este estudio evaluó la frecuencia de perforaciones radiculares provocadas por estudiantes de primer y segundo año de la especialidad de Endodoncia de la Facultad de Odontología de la Universidad Andrés Bello (UNAB), Santiago (Chile), entre 2019 y marzo de 2021. Materiales y Métodos: Se realizó un estudio observacional descriptivo a través de datos recopilados retrospectivamente en fichas clínicas de pacientes atendidos en el área de postgrado en Endodoncia de la universidad, durante 2019, 2020 y hasta marzo de 2021. Resultados: Un total de 569 pacientes fueron atendidos en el período, 118 fueron atendidos por estudiantes de primer año y 451 por los de segundo año. La frecuencia de perforaciones del primer año fue de un 0% y la del segundo año del 2 % (n = 9). Considerando el total general de pacientes, la frecuencia relativa de perforaciones fue de apenas 1,6 %. Con respecto a ubicación, 3 perforaciones fueron en el tercio cervical de la raíz, 3 en el tercio medio, 2 en el tercio apical y 1 en el piso cameral. Ninguna perforación resultó en la indicación inmediata de extracción y todas fueron selladas con materiales a base de silicato de calcio. Conclusiones: La frecuencia de perforaciones radiculares por los estudiantes de postgrado fue muy baja, lo que podría evidenciar la seguridad de los protocolos institucionales de tratamiento y enseñanza. La mayor ocurrencia de perforaciones fue con los estudiantes de segundo año, lo cual puede ser atribuido a que tratan casos de mayor complejidad.

Introduction: The present study evaluated the frequency of root perforations caused by first- and second-year students of the Endodontics specialty of the Faculty of Dentistry of the UNAB University in Santiago (Chile), between January 2019 and March 2021. Materials and Methods: A descriptive observational study was carried out through data collected retrospectively in clinical records of patients treated in the Postgraduate Endodontics Clinic of the Andrés Bello University (UNAB) during 2019, 2020 and until March 2021. Results: A total of 569 patients were treated during the period, 118 patients were seen by first-year students and 451 by second-year students. The frequency of perforations in the first year was 0% and in the second year it was 2% (n=9). Considering the overall total number of patients, the relative frequency of perforations was only 1.6%. Regarding location, 3 perforations were in the cervical third of the root, 3 in the middle third, 2 in the apical third and 1 in the pulp chamber floor. No perforation resulted in the immediate indication of extraction and all were sealed with calcium silicate-based materials. Conclusions: Te frequency of root perforations by postgraduate students was very low, which could evidence the safety of institutional treatment and teaching protocols. The greatest occurrence of perforations was with second-year students, which can be attributed to the fact that they treat cases of greater complexity.

Perceptions of rehabilitated patients with fixed partial dentures as to the temporary restoration

ABSTRACT: This study evaluated patients' perceptions regarding the installation of temporary fixed partial denture (TFPD). A questionnaire developed that addressed patients' perceptions about the temporary restorations, applied to patients after concluded their treatment. Responses were analyzed by descriptive statistics and contingency tables were constructed to statistically analyze the relationship between patients' perceptions of age, gender and type of prosthesis. We interviewed 28 patients (23 female; 5 male). In the results, 53.57% of the patients reported improvement in the chewing, 3.57% of the patients reported an improvement in speech, 21.43% of patients reported improvement in both aspects and another 21.43% of patients did not report functional improvements in speech and in chewing. Regarding dental pain, 89.28% did not present. In the hygienization aspect, 46.42% of the patients had difficulty, and 25% of the patients had bleeding gum. Finally, 89.28% of the patients reported that a TFPD made it possible to predict the final treatment outcome. No statistically significant difference was found when age (p = 0.86062) and gender (p=0.41225) were correlated. However, the type of prosthesis influenced patients' perceptions of TFPDs (p = 0.01254). It is concluded that TFPD is an important step in the treatment with fixed prosthesis.

Influence of the material for preformed moulds on the polymerization temperature of resin materials for temporary FPDs

PURPOSE: Temperature increase of 5.5 ℃ can cause damage or necrosis of the pulp. Increasing temperature can be caused not only by mechanical factors, e.g. grinding, but also by exothermic polymerization reactions of resin materials. The aim of this study was to evaluate influences of the form material on the intrapulpal temperature during the polymerization of different self-curing resin materials for temporary restorations. MATERIALS AND METHODS: 30 provisonal bridges were made of 5 resin materials: Prevision Temp (Pre), Protemp 4 (Pro), Luxatemp Star (Lux), Structure 3 (Str) and an experimental material (Exp). Moulds made of alginate (A) and of silicone (S) and vacuum formed moulds (V) were used to build 10 bridges each on a special experimental setup. The intrapulpal temperatures of three abutment teeth (a canine, a premolar, and a molar,) were measured during the polymerization every second under isothermal conditions. Comparisons of the maximum temperature (T(Max)) and the time until the maximum temperature (t(TMax)) were performed using ANOVA and Tukey Test. RESULTS: Using alginate as the mould material resulted in a cooling effect for every resin material. Using the vacuum formed mould, T(Max) increased significantly compared to alginate (P<.001) and silicone (P<.001). In groups Lux, Pro, and Pre, t(TMax) increased when the vacuum formed moulds were used. In groups Exp and Str, there was no influence of the mould material on t(TMax). CONCLUSION: All of the mould materials are suitable for clinical use if the intraoral application time does not exceed the manufacturer's instructions for the resin materials.

Comparison of the sealing ability of different types of glass ionomer cements in temporary restoration

Introduction: Glass ionomer cement has been used for temporary restoration; however, several formulations are available. Objective: The aim of this study was compare the linear leakage of different types of glass ionomer cement - R, F, N and C. Material and methods: Forty-four third molars were used and prepared with standardized class I cavity preparations. By using gutta-percha, the cavity height was standardized in 5 mm. The samples were divided into 4 experimental groups (R, N, F and C), and 2 control groups (positive - not restored, and negative - restored using resin). The teeth were waterproofed and immersed in 2% methylene blue. After 7 days, they were sectioned and the measurement of the dye leakage was performed by stereomicroscopy (40X) using a calibrated periodontal probe. Results: Data were analysed by Kruskal Wallis and Dunn tests. There was statistically significant differences (p = 0.002) between R and C, and R and N glass ionomer groups. C and N glass ionomer groups were similar. F glass ionomer group was similar to all other groups. Conclusion: It can be concluded that different types of glass ionomer formulations can influence the peripheral sealing of the restorative material. R glass ionomer was the most effective, while C and N glass ionomers were the least ones.

Coronal microleakage of four temporary restorative materials in Class II-type endodontic access preparations

OBJECTIVES: The purpose of this study was to evaluate the microleakage of 4 temporary materials in teeth with Class II-type endodontic access preparations by using a glucose penetration model. MATERIALS AND METHODS: Glucose reaction test was performed to rule out the presence of any reaction between glucose and temporary material. Class II-type endodontic access preparations were made in extracted human premolars with a single root (n = 10). Each experimental group was restored with Caviton (GC), Spacer (Vericom), IRM (Dentsply-Caulk), or Fuji II(GC). Microleakage of four materials used as temporary restorative materials was evaluated by using a glucose penetration model. Data were analyzed by the one-way analysis of variance followed by a multiple-comparison Tukey test. The interface between materials and tooth were examined under a scanning electron microscope (SEM). RESULTS: There was no significant reaction between glucose and temporary materials used in this study. Microleakage was significantly lower for Caviton and Spacer than for Fuji II and IRM. SEM observation showed more intimate adaptation of tooth-restoration interfaces in Caviton and Spacer than in IRM and Fuji II. CONCLUSIONS: Compared to IRM and Fuji II, Caviton and Spacer can be considered better temporary sealing materials in Class II-type endodontic access cavities.

Capacidad de sellado marginal de los cementos provisionales IRM®, Cavit® y vidrio ionomérico, en dientes tratados endodóncicamente: (Revisión de la Literatura)

Numerosos estudios han evaluando la capacidad de sellado de diversos materiales de obturación provisional, en dientes tratados endodóncicamente. El objetivo de la presente revisión es conocer la capacidad de sellado de los cementos provisionales IRM®, Cavit® y vidrio ionomérico en dientes tratados endodóncicamente. Los estudios muestran resultados variados, sin embargo IRM® y Cavit® presentan capacidad de sellado similar o superior por parte del Cavit®, mientras que el vidrio ionomérico presenta mejor capacidad de sellado que los dos anteriores.

Numerous studies have evaluated the ability the sealing of temporary restoration materials for the tooth after endodontic treatment. The purpose of this article is to review the ability the sealing of IRM®, Cavit® e ionomer cements in tooth endodontic treatment. Studies have shown results variety, however based on the literature that IRM® and Cavit® have show ability sealing similarity or Cavit better that IRM while ionomer cement was better that IRM® and Cavit®.

The influence of IRM temporary restorations on marginal microleakage of dentin adhesives / 대한치과보존학회지

This study investigated the influence of IRM on marginal microleakage of 5th generation adhesives. Class V cavities with gingival margins in dentin were prepared on both buccal and lingual surfaces of 60 extracted human molar teeth. Prepared teeth were randomly divided into six groups. Group 1 and 4 received no temporary restoration with IRM. Group 2 and 5 were covered with IRM mixed at P/L ratio(10g/1g). Group 3 and 6 were covered with IRM mixed at P/L ratio(10g/2g). The temporary restorations were removed mechanically with an ultrasonic scaler after one-week storage in distilled water. The cavities were restored using one of two adhesives and composites; Single Bond/Filtek Z 250(Group 1, 2 and 3), UniFil Bond/UniFil F(Group 4, 5 and 6). Following one day storage in distilled water, the restored teeth were thermocycled for 500 cycles(between 5degrees C and 55degrees C) and immersed in 2% methylene blue for dye penetration testing. The results were analysed using Kruskal-Wallis Test, Mann-Whitney and Wilcoxon signed ranked test at a significance level of 0.05. The results of this study were as follows: 1. Ranking of mean microleakage scores at the enamel margins was Group 10.05). 4. At the dentin margins, the microleakage of the group not pretreated with IRM was lower than that of the group pretreated with IRM. And the microleakage of UniFil Bond was lower than that of Single Bond. 5. Compared with microleakages between the enamel and dentin margins of each groups, Group 1, 2, 3, 4, 5 and 6 at dentin margin were higher microleakage than those at enamel margin. There were significant difference between enamel and dentin microleakage of Group 2 and 3(p<0.05).