Clinical importance of the presence of lateral canals in endodontics.

This article presents a clinical case in which the diagnosis and treatment of a lateral canal was instrumental in the successful completion of endodontic therapy. Endodontic treatment was performed by crown-down shaping and copious irrigation (using 2.5% sodium hypochlorite associated with 17% ethylenediaminetetracetic acid (EDTA)). After 10 months, there were no clinical symptoms of inflammation and radiographs showed periradicular healing.

The effect of different organic solvents on the degradation of restorative materials.

OBJECTIVE: To evaluate the solubility of three restorative materials exposed to the different endodontic solvents. MATERIALS AND METHODS: The organic solvents eucalyptus oil, xylol, chloroform, and orange oil, with distilled water as the control group was utilized. The restorative materials light-cured resin (Filtek Z250/3M ESPE), light-cured-resin-reinforced glass ionomer (Riva Light Cure LC/Southern Dental Industries SDI]) and resin-modified glass ionomer (Vitremer/3M ESPE) were analyzed. A total of 50 disks containing specimens (2 mm × 8 mm Ø) were prepared for each of the three classes of restorative materials, which were divided into 10 groups (n = 5) for immersion in eucalyptus oil, xylol, chloroform, orange oil or distilled water for periods of either 2 min or 10 min. The means of restorative material disintegration in solvents were obtained by the difference between the original preimmersion weight and the postimmersion weight in a digital analytical scale. Data were statistically analyzed by two-way analysis of variance while the difference between the materials was analyzed by Student-Newman-Keuls test. The significance level set at 0.05. RESULTS: Vitremer showed the highest solubility, followed by Riva LC, and these were statistically different from eucalyptus oil, xylol, chloroform, and distilled water (P < 0.05). Regarding the immersion time in solvents, there were no significant differences between the two tested periods (P > 0.05). CONCLUSIONS: The solvents minimally degraded the composite resin, although they did influence the degradation of both resin-modified glass ionomer resin and resin reinforced with glass ionomer.

Clinical technique for invasive cervical root resorption.

This clinical case report describes the diagnosis and treatment of an external invasive cervical resorption. A 17-year-old female patient had a confirmed diagnosis of invasive cervical resorption class 4 by cone beam computerized tomography. Although, there was no communication with the root canal, the invasive resorption process was extending into the cervical and middle third of the root. The treatment of the cervical resorption of the lateral incisor interrupted the resorptive process and restored the damaged root surface and the dental functions without any esthetic sequelae. Both the radiographic examination and computed tomography are imperative to reveal the extent of the defect in the differential diagnosis.

Crown-down preflaring in the determination of the first apical file.

In this study, scanning electron microscopy (SEM) was used to evaluate the adaptation of the first apical file after preflaring in mesiobuccal (MB) and mesiolingual (ML) canals of mandibular molars considering the tactile sensibility as a reference. The mesial canals (n = 22) of human mandibular molar teeth were used, and the first instrument to bind to the working length was determined after preflaring and crown-down shaping. Digital images of the root apex were acquired and a single examiner determined the contact of the file with the walls using Image J software. The results showed that the file was in contact in 47.83% and 31.71% in the MB and ML canals, respectively. When the apexes are fused, the average was 40.03%. A descriptive analysis showed that the first apical file did not touch all dentin walls in any of the samples.

Crown-down preflaring in the determination of the first apical file

In this study, scanning electron microscopy (SEM) was used to evaluate the adaptation of the first apical file after preflaring in mesiobuccal (MB) and mesiolingual (ML) canals of mandibular molars considering the tactile sensibility as a reference. The mesial canals (n = 22) of human mandibular molar teeth were used, and the first instrument to bind to the working length was determined after preflaring and crown-down shaping. Digital images of the root apex were acquired and a single examiner determined the contact of the file with the walls using Image J software. The results showed that the file was in contact in 47.83 percent and 31.71 percent in the MB and ML canals, respectively. When the apexes are fused, the average was 40.03 percent. A descriptive analysis showed that the first apical file did not touch all dentin walls in any of the samples.

Internal root resorption in the maxillary centralincisor

Introduction: Internal root resorption is a chronic inflammatoryprocess initiated within the pulp space with the loss of dentin. Theclastic cells present in the pulp tissue trigger a progressive resorptionphenomenon. Case report and conclusion: This paper reports aclinical case of an internal root resorption in the permanent centralincisor, at the middle third of the root canal. Because it is asymptomatic,internal root resorption needs an early diagnosis in order to institutethe endodontic treatment before the process compromises themineralized structures of the tooth.

Endoperiodontal lesion due to communication internal root resorption / Lesão endoperiodontal decorrente de reabsorção radicular interna comunicante

Internal root resorptions are usually non-symptomatic and are discovered occasionally throughperiapical radiographs, revealing a very defined and regular outline. These resorptions are progressive,and eventually perforate the periodontium. The present work describes the treatment of a clinicalcase of internal root resorption with periodontal communication, outlining the interrelation betweenperiodontal surgery and endodontic therapy.

As reabsorções internas são normalmente assintomáticas e descobertas ocasionalmente atravésde radiografias periapicais, onde revelam um contorno bem definido e regular. Estasreabsorções são progressivas e eventualmente perfuram o periodonto. O presente trabalhodescreve o tratamento de um caso clínico de reabsorção radicular interna com comunicaçãoperiodontal onde se fizeram necessárias a inter-relação entre a cirurgia periodontal e a terapiaendodôntica convencional.