Maxillary arch changes with transpalatal arch treatment followed by full fixed appliances.

Objective: To evaluate short- and long-term maxillary dental arch dimensional changes in patients treated with a transpalatal arch (TPA) during mixed dentition followed by full fixed appliances in the permanent dentition compared with an untreated sample. Materials and Methods: Dental casts and lateral cephalograms obtained from 36 consecutively treated patients before TPA treatment (T0), after TPA treatment (T1), after fixed appliance treatment (T2), and a minimum of 3 years after fixed appliance treatment (T3) were analyzed. The control group was matched as closely as possible. Arch widths, perimeter, and length, as well as crowding and incisor proclination, were evaluated. Results: In the treated group, intercanine, interpremolar, and intermolar widths and arch perimeter increased significantly at T1. At T2, only the intercanine width increase was still significant. At T3 all arch dimensions decreased, remaining larger than they were at T0. The arch length increased after T1, significantly decreased at T2, and slightly decreased at T3. The crowding decreased significantly at T1, was eliminated at T2, and increased at T3. At T3, 50% of the patients showed relapse with crowding ranging from 0.5 to 2 mm. In the control group at T1, only slight changes were noted but crowding increased. At T2, crowding and upper incisor inclination increased but arch length decreased. At T3, intercuspid width, arch perimeter, and arch length continued to decrease, thereby increasing crowding. Conclusion: Maxillary dental arch dimensions changed significantly after TPA followed by treatment with fixed appliances. Relapse occurred to some extent, especially in intercanine width and arch perimeter, but most of the dental arch changes remained stable. © 2015 by The EH Angle Education and Research Foundation, Inc

Prevalence of clinical signs of intra-articular temporomandibular disorders in children and adolescents: a systematic review and meta-analysis

Background: The aim of this systematic review and meta-analysis was to assess the prevalence of clinical signs of temporomandibular joint (TMJ) disorders in children and adolescents. Type of Studies Reviewed: The authors selected only studies in which the investigators’ primary objective was to evaluate the prevalence of signs of TMJ disorders according to the international Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) in children and adolescents. The authors performed electronic searches without language restriction in 5 databases. The authors also assessed quality. Results: In this review and meta-analysis, the authors included 11 articles that described studies in which 17,051 participants had been enrolled. The overall prevalence of clinical signs of intra-articular joint disorders was 16% (95% confidence interval [CI], 11.59-19.94; n = 17,051). The prevalence of TMJ sounds (click and crepitation) was 14% (95% CI, 9.67-19.79; n = 11,316). The most prevalent sign was clicking (10.0%; 95% CI, 7.97-12.28; n = 9,665) followed by jaw locking (2.3%; 95% CI, 0.56-5.22; n = 5,735). Conclusions and Practical Implications: One in 6 children and adolescents have clinical signs of TMJ disorders. The results of this systematic research study can alert dentists about the importance of looking for signs of TMD in children and adolescents.Cristhiani Giane da Silva, Camila Pachêco-Pereira, André Luís Porporatti, Maria Gorete Savi, Marco A. Peres, Carlos Flores-Mir, Graziela De Luca Cant

Estratégias para a recuperação de áreas degradadas pela mineração de níquel: inoculação de fungos micorrízicos isolados de solos ultramáficos em espécies de plantas nativas dessas áreas.

O objetivo deste trabalho foi verificar o efeito da inoculação de uma estirpe de FMA isolada de solos ultramáficos de Barro Alto (GO) na taxa de colonização de duas espécies de plantas nativas daquelas áreas

Estratégias para a recuperação de áreas degradadas pela mineração de níquel: influência do período de armazenamento na germinação de espécies nativas de ambientes ultramáficos.

O objetivo deste trabalho foi avaliar a influência do período de armazenamento de sementes de quatro espécies nativas de ambientes ultramáficos na germinação, visando fortalecer as estratégias de recuperação destes ambientes com espécies representativas da flora local