ABSTRACT
BACKGROUND: "Self-adhering composite resins," are claimed to eliminate the need for a separate acid etching and bonding agent application step, thus simplifying the direct restorative procedure, both regarding the technique sensitivity and the duration of treatment. AIM: The aim of this study is to evaluate the marginal adaptation of self-adhering flowable composite (Dyad flow) in comparison to the conventional flowable composite (Tetric N-flow) under scanning electron microscope (SEM). SETTINGS AND DESIGN: This in vitro study was conducted on 44 extracted human maxillary premolars. MATERIALS AND METHODS: Box-only Class II cavities on the distal surface were prepared with the dimensions of 4 mm buccolingual width, 2 mm mesiodistal depth, and gingival margin at the cementoenamel junction. They were divided into two groups of 22 teeth each and were restored accordingly: Group I - Gingival floor lined with Tetric N-Flow and were restored with Tetric N-Ceram; Group II - Gingival floor lined with Dyad flow and were restored with Herculite Precis. After thermal cycling, the sectioned tooth-restoration interfaces were evaluated for the marginal adaptation under SEM at ×200 magnification. STATISTICAL ANALYSIS USED: The resultant data were statistically analyzed by applying Chi-square test, using the SPSS (version 16.0) software. RESULTS AND CONCLUSION: There was no statistically significant difference between the study groups regarding the marginal adaptation. The marginal adaptation of the self-adhering flowable composite when used as a liner in Class II restorations was comparable to that of the conventional flowable composite.
ABSTRACT
BACKGROUND: "Visagism," a proposed novel concept, makes it possible for the patients to express the desirable emotions and personality traits, through their smile. According to this concept, clinicians can design a smile that blends with the patient's physical appearance, personality, and desires. AIM: To establish a relation, if any, between the smile pattern (dentofacial esthetics determined by three parameters, i.e., tooth form, long axes of maxillary anterior teeth, and connection line between embrasure) and the personality traits (four mental temperaments) through the concept of visagism. SETTINGS AND DESIGN: A total of 190 participants aged between 20 and 38 years from a dental college were selected for the study. MATERIALS AND METHODS: The temperaments of the participants were identified using a self-reporting questionnaire. The photographs of frontal view of teeth in centric occlusion of the participants were captured, and their tooth forms, long axes, and embrasure lines were drawn using photograph editing software. The type of temperament obtained from the questionnaire for each participant was compared with that obtained from photographic evaluation. STATISTICAL ANALYSIS USED: The obtained data were statistically analyzed by applying Kappa statistics for kappa measure of agreement. RESULTS: There was no agreement between temperaments derived through questionnaire and those temperaments obtained from the photographic analysis. CONCLUSION: Although the concept of combining the principles of smile design and mental temperaments through visagism is an appreciable idea, it lacks a practical approach to create a personalized smile for each patient by including mental temperaments at present stage.
ABSTRACT
The apical termination of obturation is the most important factor influencing the success of root canal treatment (RCT). Working length (WL) is the key element in achieving this. AIM: The aim of this study is to compare and evaluate the preoperative estimated WL with conventional radiograph and with grid radiograph, with reference to electronic apex locator (EAL) in single-rooted teeth. SETTINGS AND DESIGN: Thirty permanent anterior teeth with complete root formation indicated for RCT were included in this study. MATERIALS AND METHODS: Conventional radiograph (Group 1) and conventional radiograph with external grid (Group 2) were made before access opening. WL with EAL (Group 3) was determined after access opening. STATISTICAL ANALYSIS: The statistical package for the social sciences (SPSS) version 16.0 (SPSS Inc., Chicago, IL, USA) was used to compare the WLs of three groups, and the statistical significance was considered to be P ≤ 0.05. ANOVA, post hoc test were made to measure the intergroup comparison, and Pearson correlation values were obtained. RESULTS AND CONCLUSION: The results of the study showed a higher correlation between grid WL and apex locator WL than conventional WL and apex locator WL. Preoperative metrics with radiographic grid along with the apex locator is a better measuring tool compared to the conventional radiographic WL in a single-rooted tooth.
