The aim of this study was to assess intra-arch mandibular dimensional changes that may occur during mouth opening using cone beam-computed tomography (CBCT). Fifteen patients in need of any type of treatment whose execution considered a pre- and post-CBCT assessment consented and were enrolled. CBCTs were taken with the following settings: 90 kV, 8 mA, field of view (FOV) 140 by 100 mm (height and diameter), Voxel size 0.25 mm (high resolution). The pre-CBCT was executed in the maximum mandibular opening (MO), while the post-CBCT was in the maximum intercuspation (MI). A thermoplastic stent with radiopaque fiducial markers (steel ball bearings) was fabricated for each patient. Measurements were made using radiographic markers between contralateral canines and contralateral first molars and between ipsilateral canines and first molars on both sides. Paired t-tests were performed to evaluate the difference between open and closed positions on these four measurements. In the MO position were registered a significative tightening of the mandible at the canine (−0.49 mm, SD 0.54 mm; p < 0.001) and molar points (−0.81 mm, SD 0.63 mm; p < 0.001) and a significative shortening of the mandible on the right (−0.84 mm, SD 0.80 mm; p < 0.001) and left sides (−0.87 mm, SD 0.49 mm; p < 0.001). Within the study limitations, mandibular flexure determined a significant shortening and tightening between maximum intercuspation to maximum opening positions. Mandibular dimensional changes should be considered in light of other patient factors in the treatment planning of implant positioning and long-span complete arch implant-supported fixed prostheses in order to avoid technical complications.

Despite aesthetic trends, metal–ceramic restorations continue to be widely accepted due to their durability, and variations in surface preparation process can significantly influence bond strength outcomes. The purpose of this study was to determine whether there are differences in the bond strength depending on three surface treatment protocols for veneering ceramics on Ni-Cr alloys. The following surface treatments were used: (1) control (C) (no treatment), (2) airborne-particle abrasion (APA) with 50 µm Al₂O₃ (G1-APA), (3) APA followed by oxidation (G2-APA-O), and (4) APA-O, with a second APA (G3-APA-O-APA). Subsequently surface roughness (R_a and R_z) was evaluated using profilometry, hardness was measured through Leeb’s hardness dynamic test (HLD), morphology was investigated through scanning electron microscopy (SEM), and the chemical composition of the alloy surface was evaluated using energy-dispersive spectroscopy (EDS). After surface treatments, veneering ceramic was applied, the debonding crack initiation strength (DCIS) was investigated through the three-point bending test, failure mode was classified using a stereoscopic microscope, and chemical characterization of the fractured surfaces was performed using Raman spectroscopy (RS). For DCIS, G2-APA-O demonstrated the highest value 63.97 ± 44.40 (MPa) (p < 0.05). The results of this study indicate that oxidation treatment has a positive effect on the bonding strength between veneering ceramic and Ni-Cr alloys.

Introducción: Es necesaria una adecuada interacción multidisciplinaria entre médicos y profesionales de la salud bucodental para disminuir las repercusiones de la enfermedad periodontal.Objetivo: Determinar si aspartato aminotransferasa salival (AST) es mejor biomolécula diagnóstica de periodontitis comparada con AST sérica e Interleucina- 6 (IL-6) y factor de necrosis tumoral-alfa (TNF-α) salivales y séricas.Material y Método: Estudio de metodología mixta, compuesta por dos subestudios, el primero, experimental, comparativo, transversal, retrospectivo para determinar la capacidad diagnóstica de AST, IL-6 y TNF-α salivales y séricas en sujetos sin diagnóstico de periodontitis que acuden al servicio de medicina general y el segundo, experimental, comparativo, longitudinal, para confirmar la capacidad diagnóstica de AST salival (ASTsa), antes y después de tratamiento periodontal en sujetos que acuden al servicio de salud bucodental. El diagnóstico de periodontitis se determinó mediante el índice de Extensión y Severidad (IES).Resultados: Solo los niveles de ASTsa fueron diferentes entre sujetos sin y con periodontitis (p < 0,0005), los cuales correlacionaron con la extensión (r = 0.410, p < 0.0005) y severidad (r = 0.428, p < 0.0005) del IES, y presentaron un punto de corte de 16.0 UI / mL con alta capacidad discriminativa (Área bajo la curva = 0.936, IC 95 %, 0.864 - 1,000; p < 0,001). Además, posterior a tratamiento periodontal los niveles de ASTsa disminuyeron (116.9 ± 76.2. U/L vs 58.8 ± 47.0 U/L, p < 0.001).Conclusión: ASTsa es la mejor biomolécula diagnóstica de periodontitis que podría utilizarse como puente de interacción multidisciplinaria.Palabras claves: Aspartato aminotransferasa salival, periodontitis, interacción multidisciplinariaTítulo corto: AST salival y diagnóstico de periodontitis.