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Aim of the study: to assess maxillary sinus volume changes (MSV) in adolescent patients with class III malocclusion after application of three types of rapid maxillary expanders (RME). Material and Methods: This was a prospective cohort study that recruited adolescent (13-17 years old) class III malocclusion patients with maxillary deficiency. Patients were randomly assigned to three study groups according to the type of RME: Conventional hyrax (CH), hybrid hyrax (HH), and maxillary skeletal expanders (MSE). Cone-beam computed tomography (CBCT) was used to measure MSV prior to and 6 months after application of RME. Measurements were compared between right and left sides and within study groups. P-values of less than 0.05 were considered significant. Results: A total of 51 patients (30 girls and 21 boys) were included. Mean ages were 14.89±1.6, 15.31±1.73, and 15.59±1.9 Y in the CH, HH and MSE groups respectively. Measurements in all groups were significantly increased. In CH and MSE groups, there was no significant difference between the right and left side before treatment (P =0.386).  But in HH, both before and after treatment, the right side values were considerably greater than the left side value (P≤0.05).

be managed with multispecialty team. Constant follow-up and optimal time to start the reconstructive management depend upon a disease-free state of atleast 4 months.

This in vitro study compared the shear bond strength (SBS) and antibacterial efficacy of an orthodontic adhesive containing either cinnamon or titanium dioxide (TiO2) nanoparticles (NPs). A total sample of 120 freshly extracted teeth was randomly divided into three groups, according to the type of NPs incorporated into adhesive for metallic orthodontic brackets’ bonding: group 1—conventional orthodontic adhesive (TXT) as a control; group 2—conventional orthodontic adhesive mixed with TiO2 NPs (TXT + TNP); and group 3—conventional orthodontic adhesive mixed with cinnamon NPs (TXT + CNP). The SBS and adhesive remnant index (ARI) scores were evaluated and compared between the groups. The antibacterial efficacy against Streptococcus mutans for all the groups was assessed via a disc agar diffusion test. Data comparisons among groups were performed by ANOVA followed by Bonferroni post hoc test. Antibacterial efficacy comparison between the experimental groups was performed via an independent t-test. The significance level for all the tests was set at p ≤ 0.05. The highest mean SBS values (10.11 ± 1.88 MPa) were in the TXT control group followed by TXT + TNP (9.40 ± 1.78 MPa), and the lowest SBS was in the TXT + CNP (8.99 ± 1.77 MPa) group. The mean SBS among the experimental groups was non-significant (p = 0.241). Antibacterial effects significantly increased (p ≤ 0.05) in both experimental groups. However, TXT + TNP revealed a significantly higher antibacterial effect (p = 0.021) than TXT + CNP. In conclusion, incorporating cinnamon or TiO2 NPs into an orthodontic adhesive improves its antibacterial effects without compromising the bond strength for clinical purposes.

Introduction: Soft tissue expansion with percutaneous distensible expanders gained popularity for reconstructive surgery in the face and neck. Purpose: The aim of this study was to compare by using tissue expander with autogenous bone graft versus autogenous bone graft only for reconstruction of anterior region of the mandible. Materials and Methods: The study included 20 patients with anterior mandibular bony defects. Patients were randomly divided into 2 groups. Patients in group I, underwent mandibular augmentation with tissue expander followed by autogenous bone graft. While in group II, autogenous bone graft was used only. Preoperative and six months postoperatively; computed tomography and lateral cephalometric views had been performed in all cases in both groups. Cephalometric points, landmarks and measurements are recoded to compare between both groups regarding pre and postoperative results. Results: In both groups, comparison between pre and post-operative variables showed; significant difference of the mandible in the anteroposterior direction and non-significant change in the vertical measurements. Soft tissue profile showed significant increase in the position of the upper and lower lip and soft tissue pogonion. While, the nasolabial angle, the pronasale, and soft tissue A point showed non-significant changes. Comparison between both groups showed significant improvement of the horizontal direction of the mandible, mandibular length and soft tissue profile in group I than group II. P-value (> 0.05) was considered non-significant. Conclusion: Tissue expansion has become a popular procedure in the reconstruction of face and neck lesions.