Objectives To investigate the long-term prevalence of self-reported sleep bruxism (SB) and awake bruxism (AB) and their association with mental disorders in adults from the 1982 Pelotas Birth Cohort, Southern Brazil. Materials and methods Data on SB and AB were collected at age 40 using subject-based reports. Symptoms of common mental disorders (CMD) were assessed using the Self-Reporting Questionnaire (SRQ-20) at ages 30 and 40, and specific mental disorders were assessed using the Mini International Neuropsychiatric Interview (M.I.N.I.) at age 40. Exploratory variables included demographics, socioeconomic status, mental health history, and unhealthy behaviors. Associations were analyzed using crude and adjusted Poisson regression models with robust variance. Results Both were associated with female sex (PR 1.48, 95% CI 1.27–1.72 for AB; PR 1.47, 95% CI 1.27–1.70 for SB) and alcohol dependence (PR 1.47, 95% CI 1.09–1.99 for AB; PR 1.34, 95% CI 1.00–1.79 for SB). Depression was associated with a higher prevalence of AB (PR 1.50, 95% CI 1.10–2.05) and SB (PR 1.41, 95% CI 1.05–1.90). Participants who experienced probable CMD at both 30 and 40 years had a higher prevalence of AB (PR 2.02, 95% CI 1.62–2.52) and SB (PR 1.52, 95% CI 1.23–1.88) compared with those who had never experienced probable CMD. Conclusions Patterns of probable common mental disorders were associated with a higher prevalence of self-reported SB and AB at age 40.
Purpose The purpose of this study was to evaluate the effect of filler particle size on the printability, mechanical behavior, and surface properties of highly filled experimental 3D-printed dental resins before and after thermocycling. Material and methods Two highly filled experimental resins containing silanized barium glass with different particle sizes were formulated: microparticulated (1.5 µm) and submicroparticulated (0.7 µm). Specimens were additively manufactured by digital light processing and subjected to flexural strength (FS), elastic modulus (EM), Vickers microhardness (VHN), surface roughness (Ra), contact angle (θ), and shear bond strength (SBS) analyses before and after thermocycling (5000 cycles; 5°C-55°C). Printing time was also evaluated. Data were analyzed by independent t-test, 2-way ANOVA and Tukey tests (α=.05). Results The 0.7-µm formulation required significantly longer actual fabrication time than the 1.5-µm formulation (122.37 ± 12.10 versus 48.23 ± 2.96 min; p<.001). Before thermocycling, the 0.7-µm formulation showed significantly higher FS (p=.012) and EM (p<.001) but these differences were not maintained after aging. Thermocycling significantly reduced FS in both formulations (p<.001). The 0.7-µm formulation exhibited lower Ra and higher contact angle values than the 1.5-µm formulation, whereas no significant differences were observed for VHN or SBS. No significant formulation × aging interactions were detected for any evaluated property. Conclusions The 0.7-µm formulation showed higher initial flexural strength and elastic modulus and lower surface roughness. However, the mechanical differences were not maintained after thermocycling and no advantages were observed for microhardness or shear bond strength. These changes were accompanied by substantially longer fabrication time. Clinical Significance Reducing filler particle size in highly filled 3D-printed resins may improve initial mechanical behavior and reduce surface roughness but these mechanical advantages were not maintained after thermocycling and were accompanied by substantially longer fabrication time.
Objective The socket-shield technique (SST) aims to limit post-extraction remodeling by preserving the buccal root fragment and its periodontal attachment apparatus; however, the procedure remains technique-sensitive, particularly during root preparation. This Short Communication presents a digitally guided workflow integrating guided socket-shield preparation and immediate implant placement using the same CAD/CAM surgical guide incorporating a dedicated guiding sleeve. Methods The protocol was clinically applied in a 45-year-old female patient with a subgingival fracture of the maxillary right central incisor that precluded both conservative and prosthetic restoration. Digital planning was based on superimposed CBCT and intraoral scan datasets. Guided preparation of the buccal root fragment was followed by immediate implant placement, placement of a transmucosal CONNECT abutment, and immediate provisionalization. The provisional restoration was used to condition the peri‑implant soft tissues, and its transmucosal contour was subsequently transferred unchanged to the definitive restoration without an additional intraoral scan or conventional impression. Results Clinical and radiographic follow-up over 5 years demonstrated stable peri‑implant soft tissues and bone levels without treatment-related complications. Conclusions This single clinical application supports the feasibility of the proposed digitally guided protocol. Further prospective comparative studies are required to assess root-preparation accuracy, reproducibility, and clinical benefits. Clinical significance The use of a dedicated guiding sleeve enables socket-shield root preparation and immediate implant placement to be integrated within a single digitally planned surgical workflow.
