ABSTRACT
The main goal of orthograde root canal retreatment is to completely remove the root canal content and chemically treat the residual infection. Purpose: The aim of this study was to evaluate the effectiveness of D-Race retreatment files supplemented with XP-Endo Finisher R in the removal of root canal filling material from oval-shaped canals. Methodology: Twelve mandibular incisors initially shaped with XP-Endo Shaper and filled by warm vertical compaction were consistently retreated with D-Race files and XP-Endo Finisher R. Micro-CT images were used to evaluate the quality of the root canal filling and the amount of remaining filling material after the two retreatment procedures. Results: The largest amount of root canal filling was removed at full canal length after using each of the retreatment systems. Significant difference was registered between the accumulated effect of the retreatment with D-Race and XP-Endo Finisher R and the volume of the initial filling material at full canal length (p<0.001). Insignificant difference in the amount of remaining filling material was found after using the supplementary retreatment system (p>0.05). The XP-Endo Finisher R file was almost equally efficient in the different portions of the canals but was still most productive apically. Conclusions: The additional application of XP-Endo Finisher R after the D-race retreatment files removed a significant amount of root canal filling. The combined use of the two retreatment systems did not result in completely clean root dentin walls.

ABSTRACT
Cleaning and shaping of the root canal system are essential for the successful outcome of endodontic treatment. In addition to the routinely used irrigating solutions, other technologies have been investigated for the treatment of root canal dentine, such as different types of laser systems. Purpose: The aim of our in vitro study was to evaluate the effect of different types of laser irradiation (Er:YAG , Nd:YAG, diode laser and photodynamic therapy) on the intracanal dentin and their interference in the apical seal of filled root canals. Methodology: 72 human single rooted teeth were randomly assigned into 6 groups. Root canal preparation was done using ProTaper Universal rotary system up to F3. The laser irradiation was performed at the end of the traditional endodontic preparation as a final means of decontaminating the endodontic system. Teeth were filled with a core-carrier system Guttacore (Dentsply, Sirona) and sealer AH- plus. Results: Statistical analysis showed that all groups had significantly less leakage in apical third than the control group. The laser-treated groups presented better results than Group II (Classical disinfection protocol), without statistically significant difference. The morphological changes on the apical intraradicular dentin surface caused by Nd:YAG and Er:YAG laser irradiation resulted at least linear dye apical leakage. Conclusions: Laser irradiation may improve the apical seal of the root canal. Different type of laser systems with appropriate parameters are recommended to be used as an adjunct to the current chemical root canal disinfection protocols.

ABSTRACT
Background: A variety of approaches can be employed to close diastemas using conservative and non-conservative restorative techniques such as composite restorations, laminate veneers, and crowning if there is no indication for orthodontic treatment. Objectives: This paper aimed to discuss the mechanical properties of sectional laminate veneers, the preparation, and the ceramic material used for their manufacturing. Material and methods: A case of a maxillary midline diastema closure using feldspathic partial laminate veneers with an ultra-conservative preparation is described. Results: Feldspathic sectional laminate veneers achieve an esthetically pleasant diastema closure. The ultra-conservative preparation and adequate polishing technique preserve dental and gingival tissues. Conclusion: It can be concluded that sectional partial veneers are an esthetic option with low mechanical properties that must be carefully indicated.

ABSTRACT
Odontogenic fibroma is a rare benign tumor of mature fibrous connective tissue, with varying amounts of inactive-appearing odontogenic epithelium, with or without evidence of calcification. There are two types ; central odontogenic fibroma and peripheral odontogenic fibroma. Peripheral odontogenic fibroma is a rare, non-encapsulated benign tumor of the oral mucosa often mistaken for a reactive lesion. Peripheral odontogenic fibroma is very often underdiagnosed or simply misdiagnosed, and therefore not much is known about this lesion. Through this work, we tried to bring out the sociodemographic, clinical, paraclinical and therapeutic characteristics of this lesion.