Biomechanical and histomorphometric analysis of osseodensification drilling versus conventional technique: a systematic review and meta-analysis.

Objectives: This systematic review aimed to search the literature for the answer to the following questions. In human studies: Does the osseodensification technique increase the resonance frequency analysis given in implant stability quotient value and the insertion torque value compared to the conventional technique? In animal studies: Does the osseodensification technique increase implant stability quotient, bone-to-implant contact, and bone area fraction occupancy values over the conventional technique?

Data Sources: A search for studies was carried out in eight databases until August 2021. Out of the 447 publications found, 11 were included.

Interaction of different concentrations of 10-MDP and GPDM on the zirconia bonding.

Objectives: To analyze the influence of different concentrations of 10-MDP and GPDM used, combined or not, on the bonding to zirconia.

Methods: Specimens of zirconia and a resin-composite (7 mm length, 1 mm width, and 1 mm thick) were obtained. The experimental groups were obtained according to the functional monomer (10-MDP and GPDM) and the concentrations (3 %, 5 %, and 8 %).

Physicochemical properties of dental resins formulated with amine-free photoinitiation systems.

Objective: To assess the mechanical properties of two different dimethacrylate resin blends containing the photosensitizer camphorquinone (CQ) alone or in combination with one or more synergists including an amine and/or an iodonium.

Methods: Two co-monomer resin blends were formulated using Bis-GMA/TEGDMA and UDMA/TEGDMA, both at 1:1 mass ratio. Each resin blend was divided into four groups, comprising the following four photoinitiation systems: (1) CQ + 2-(dimethylamino)ethyl methacrylate (DMAEMA); (2) CQ + DMAEMA + bis(4-methyl phenyl)iodonium hexafluorophosphate (BPI); (3) CQ; and (4) CQ + BPI.

Effectiveness of XP-Endo Finisher in the reduction of bacterial load in oval-shaped root canals.

This study investigated the effectiveness of XP-Endo Finisher (XPF) associated with XP-Endo Shaper (XPS) or Reciproc Blue (RB) files in reducing bacterial load in oval-shaped root canals (RC) during chemomechanical preparation (CMP) using 0.9% saline solution (NaCl) or 2.5% sodium hypochlorite (NaOCl).

Effect of Fiber Post Cementation Timing on the Bond Strength of Resin Cements in Epoxy Resin-Obturated Canals.

This study evaluated the influence of timing after endodontic treatment and type of resin cement used on the bond strength of fiber posts to epoxy resin-obturated canals. A total of 80 bovine incisor roots were divided into four groups (n = 20). Glass fiber posts were cemented at two different times, immediately or 7 days after endodontic treatment, using either a dual-curing resin cement (RelyX ARC, 3M ESPE) or a self-adhesive resin cement (RelyX U200, 3M ESPE).

Effect of rotatory instrument speed on its capacity to remove demineralized and sound dentin.

Objectives: The aim of this study was to evaluate the capacity of two rotatory instruments (controlled speed electric motor [CSEM] - 300 rpm; conventional slow handpiece [CSHP] - 18,000 rpm) to remove sound and demineralized dentin, by examining prepared cavity walls using the scanning electron microscopy (SEM) and assessing loss of mass.

Materials And Methods: A total of 40 blocks of human occlusal dentin, measuring 5 mm × 5 mm × 4 mm (L × W × H), were divided into two groups according to the substrate type in which the cavity preparation was performed: D - demineralized dentin; and S - sound dentin (control group). The groups were subdivided according to the rotatory instrument used for cavity preparation (n = 10): CSEM (300 rpm); and CSHP (18,000 rpm).