(1) Objective: The aim of this study was to assess the biological behavior of bone tissue on a machined surface (MS) and modifications made by a laser beam (LS) and by a laser beam incorporated with hydroxyapatite (HA) using a biomimetic method without thermic treatment (LHS). (2) Methods: Scanning electron microscopy coupled with energy-dispersive X-ray spectrometry (SEM/EDX) was performed before and after installation in the rabbit tibiae. A total of 20 Albinus rabbits randomly received 30 implants of 3.75 × 10 mm in the right and left tibias, with two implants on each surface in each tibia. In the animals belonging to the 4-week euthanasia period group, intramuscular application of the fluorochromes calcein and alizarin was performed. In implants placed mesially in the tibiofemoral joint, biomechanical analysis was performed by means of a removal torque (N/cm). The tibias with the implants located distally to the joint were submitted for analysis by confocal laser microscopy (mineral apposition rate) and for histometric analysis by bone contact implant (%BIC) and newly formed bone area (%NBA). (3) Results: The SEM showed differences between the surfaces. The biomechanical analysis revealed significant differences in removal torque values between the MSs and LHSs over a 2-week period. Over a 4-week period, both the LSs and LHSs demonstrated removal torque values statistically higher than the MSs. BIC of the LHS implants were statistically superior to MS at the 2-week period and LHS and LS surfaces were statistically superior to MS at the 4-week period. Statistical analysis of the NBA of the implants showed difference between the LHS and MS in the period of 2 weeks. (4) Conclusions: The modifications of the LSs and LHSs provided important physicochemical modifications that favored the deposition of bone tissue on the surface of the implants.

A extração profilática de terceiros molares tem causado muita discussão e controvérsia entre os cirurgiões-dentistas. As razões que apoiam a extração profilática incluem impactação, pericoronarite, lesões cariosas, alterações periodontais distais aos segundos molares, apinhamento e risco de cistos odontogênicos. Por outro lado, a extração de terceiros molares, embora seja um procedimento cirúrgico de rotina, também é uma intervenção invasiva que pode levar a acidentes e complicações. O processo foi realizado por meio de uma busca de publicações científicas nas bases de dados: Biblioteca Virtual em Saúde (BVS) e PubMed/Medline, utilizando os descritores "extração dentária", "terceiro molar" e "cirurgia bucal" com o boleador "OR". De acordo com a literatura, a extração profilática de terceiros molares pode prevenir alguns problemas de saúde bucal, que podem estar associados à doença periodontal, lesões cariosas, reabsorção radicular adjacente, pericoronarite, desenvolvimento de cistos, tumores odontogênicos e dor. Além dos riscos à saúde bucal, os dentes do siso podem causar dificuldade de mastigação, ansiedade, insônia, irritabilidade e algumas restrições alimentares que podem prejudicar as relações sociais diárias do indivíduo. Diante do que foi apresentado, podemos concluir a necessidade de se entender a particularidade de cada paciente em relação a extração dos terceiros molares, atentando-se para o correto diagnóstico e prognóstico para propor a melhor opção de tratamento, seja ele preventivo ou terapêutico.

The increasing use of cone beam computed tomography (CBCT) has led to a growing demand for DICOM software that enables the assessment and measurement of craniofacial structures. This study aimed to compare the airway volume and the minimum axial area in patients with cleft lip and palate using five different imaging software programs: Dolphin3D, InVivo Dental, ITK Snap, InVesalius, and NemoFAB. Initially, 100 CBCT scans were selected by an examiner, and their corresponding DICOM files were collected. The oropharyngeal segments were delineated following the manufacturer’s guidelines, using two different segmentation techniques: interactive and fixed threshold. The results were analyzed using the Friedman test and Wilcoxon post hoc test, with a 5% significance level for all statistical tests. The findings for both the minimum axial area and total volume revealed that the median values across the software groups were higher than expected, and significant differences were observed when comparing the groups (p < 0.001). All five software programs showed notable differences in their outputs. Specifically, a statistically significant difference in volume was found across all groups, except between InVivo and ITK-Snap. It is recommended that pre- and post-treatment comparisons be performed using the same software for consistency.

There were two errors in the original publication

Objective: The objective of this work is to report the reconstruction and rehabilitation of an atrophic mandible with an iliac crest graft and dental implants. Methods: Patient A.F, 55 years old, attended the dental clinic in the city of Araçatuba/SP, with aesthetic complaints and edentulism. Bone graft collected from the iliac crest was used for reconstruction, followed by the installation of 4 dental implants and a block graft fixed with a titanium screw. Results: At the end of the work, the patient showed notable functional and aesthetic improvements. The free iliac bone graft is considered a favorable alternative for maintaining satisfactory functional and aesthetic results in patients with severely atrophied alveolar ridges. It was possible to note that oral rehabilitation with iliac crest bone graft and dental implant is a complex procedure that involves several challenges, both from a surgical and rehabilitation point of view. Conclusion: Therefore, we can conclude that overcoming these challenges requires a multidisciplinary approach, involving oral surgeons, periodontists, prosthetists and other health professionals to ensure the best possible result for the patient.

The growing demand for implant-supported rehabilitative prosthetic treatments has reinforced the need to optimize biomechanical performance, particularly regarding force distribution. This study aimed to evaluate the stress distribution generated by different configurations of full-arch implant-supported prostheses using three-dimensional finite element analysis. Two mandibular models were created using SolidWorks 2010 (SolidWorks Corp., Waltham, MA, USA) and Rhinoceros^® 3D 4.0 (NURBS Modeling for Windows, USA). Each model represented a mandible restored with a full-arch fixed prosthesis supported by external hex implants (4.0 × 13.0 mm; Master, Conexão Sistemas de Prótese, São Paulo, Brazil) placed in the interforaminal region, differing only in implant angulation. Model 1 included four implants positioned perpendicular to the alveolar ridge, whereas Model 2 represented the All-on-Four configuration with distal implants tilted at 30°. The prosthesis was modeled in acrylic resin with a NiCr metal framework. The geometries were exported to FEMAP 11.0 for mesh generation. Axial loading of 300 N was applied bilaterally (75 N per tooth), and oblique loading of 150 N was applied unilaterally (75 N per tooth) on the first premolars and first molars. Obtained using NEiNastran^® 9.2 showed that the tilted-implant model exhibited higher stress concentrations under both loading conditions. The All-on-Four configuration generated the highest stress levels, particularly around the distal implants. The null hypothesis of this study was that there would be no difference in stress distribution among full-arch implant-supported prostheses supported by straight implants and those rehabilitated according to the All-on-Four concept with tilted distal implants.