Libri correalti

Purpose: To evaluate the effects of airborne-particle abrasion (APA) with alumina particles vs silicamodified alumina particles on the bond strength between zirconia and conventional MDP-based (Ph) or selfadhesive resin cements. Materials and Methods: Five surface treatments were evaluated: (1) C = control (no surface treatment); (2) AB = APA with alumina particles; (3) ABP = APA combined with MDP-based primer; (4) SS = APA with silica-modified alumina particles combined with silane; and (5) SSP = SS protocol combined with MDP-based primer. The surface roughness (Ra) of the APA samples (n = 5) was measured by a contact profilometer. Cylinders of the resin cements tested were bonded to the surface-treated zirconia. The microshear test was performed by the application of a load, with a wire loop, parallel to the adhesive interface until debonding of the resin cement cylinders. The microshear bond strength (μSBS) of the samples was measured before and after being subjected to thermocycling (TC; 5ºC to 55ºC, 60-second dwell time, 3,000 cycles). One-way ANOVA (surface roughness) and two-way ANOVA (μSBS) followed by Tukey post hoc test (α = .05) were used. Results: The SS (Ph: 12.6 MPa; Ph + TC: 6.37 MPa; SA: 11.8 MPa; SA + TC: 9.37 MPa) and SSP (Ph: 10.4 MPa; Ph + TC: 5.82 MPa; SA: 10.4 MPa; SA + TC: 10.0 MPa) surface treatments produced the highest surface roughness values (P < .001). The SS samples achieved the highest immediate bond strength for both resin cements. However, after TC, SA resin cement associated with any surface treatment produced the highest bond strength values. Conclusion: Self-adhesive resin cement promotes higher and more stable bond strength values when associated with a surface roughening method.

Purpose: The study aimed to evaluate the outcomes of flapless guided surgery related to surgery, patient, operator, assistant, and advisor, comparing it with conventional surgery performed by undergraduate students who had never placed implants in patients. Materials and methods: A randomized controlled split-mouth clinical trial was carried out. Ten patients with bilateral mandibular posterior tooth loss received an implant on each side with conventional flap surgery or flapless guided surgery that was performed by undergraduate students. Surgery time, pain, patient satisfaction, quantity of consumed medications, time of procedure, ease of procedure, anxiety, and stress were assessed. Results: Conventional surgery showed statistically significantly inferior results compared with flapless guided surgery in terms of procedure time (56 minutes, 36 seconds ± 8 minutes, 38 seconds vs 30 minutes, 1 second ± 6 minutes, 2 seconds), consumption of analgesic medications (49 tablets vs 15 tablets), intraoperative (1.75 ± 1.56 vs 0.65 ± 0.64) and postoperative pain (4.62 ± 2.17 vs 1.17 ± 0.72), and operator anxiety (4.76 ± 1.66 vs 3.47 ± 1.50), respectively. Conclusion: Flapless guided implant surgeries performed by individuals with no previous clinical experience showed reduced surgery time and delivered better patient-reported outcomes both in the intraoperative and postoperative periods; reduced medication consumption; and showed better results in the operator and assistant perspectives. Parole chiave: 3D, computer-guided surgery, dental implant, flapless procedure, surgical guide

This study evaluated the impact of soft tissue grafts to reduce marginal periimplant recession (MPR) after 1 year of follow-up. A total of 24 patients with one single failing maxillary incisor presenting facial bone dehiscence and receiving an immediate implant, bone graft, and provisional were randomly divided into three groups (n = 8 in each group): control (CTL), collagen matrix (CM), and connective tissue graft (CTG). Clinical, photographic, and tomographic analyses were performed to evaluate tissue alterations. The use of a CTG avoided MPR (P .05) and provided better contour of the alveolar ridge (P .01) and greater thickness (P .05) of the soft tissue at the implant facial aspect.