Which factors affect the risk of membrane perforation in lateral window maxillary sinus elevation? A prospective cohort study.

It was the aim of this prospective cohort study to assess the various anatomical and other patient-related factors that increase membrane perforation risk. Patients underwent cone-beam computed tomography (CBCT) before surgery. The presence of septa, presence of mucous retention cyst, lateral wall thickness, membrane thickness, and residual bone height were predictive factors. Age, gender, and smoking were covariates for the study. The presence or absence of membrane perforation was the study outcome. In total, 140 subjects were studied. The hazard ratio (HR) for the presence of septa with membrane perforation was 8.07 (2.93-22.29) (p < 0.001). The HR for perforation with a single edentulous area relating to two or more teeth was 68.09 (9.52-49.16). The risk of membrane perforation in smokers was 25 times more than in non-smokers - HR 25 (7.58-82.51) (p < 0.001). The HR for membrane perforation in subjects with mucous retention cysts compared with subjects without retention cysts was 27.75 (8.73-88.23) (p < 0.001). Within the limitations of the study it seems that anatomical, habitual, and pathological factors may increase the risk of Schneiderian membrane perforation when a lateral window approach is used for sinus floor augmentation.

Comparison of marginal bone loss in SLA and RBM implants: A prospective cohort study.

Context: The study aims to answer the following question: Among the patients who received a dental implant, is there any difference in marginal bone loss (MBL) between sandblasted and acid-etched (SLA) and resorbable blast media (RBM) implants? Aims: The study aimed to evaluate marginal bone loss in SLA and RBM implants one year after loading. Settings and Design: A Prospective Cohort Study. Methods and Material: In this prospective cohort study with a pre-protocol population, subjects were assigned into two groups: Subjects received SLA implants in group 1 and RBM in group 2. MBL was assessed 12 months after loadings through digital parallel radiographs. Statistical Analysis Used: An Independent t-test was used to compare MBL between the two groups. Results: Sixty-six implants were studied (each group 33 implants). The mean of MBL in the RBM group was significantly higher than the SLA group (1.39 ± 0.31 mm, 0.89 ± 0.26 mm, respectively, P < 0.001). MBL in the mesial sides of implants in the RBM group was significantly higher than the SLA group (1.28 ± 0.29 mm, 0.8 ± 0.29 mm, respectively, P < 0.001). Analysis of the data demonstrated a significantly higher mean of MBL in the distal sides of implants in the RBM group than in the SLA group (1.51 ± 0.35 mm, 0.97 ± 0.27 mm, respectively, P < 0.001). In both groups, the mean of MBL on the distal side was significantly higher than on the mesial side (P < 0.05). Conclusions: Within this study's limitation, RBM implants showed significantly more MBL than SLA implants.

Is the Prevalence of Vitamin D deficiency in Patients with Temporomandibular Disorder Higher than Healthy Control Group?

Purpose: Vitamin D plays an essential role in subchondral bone, cartilage, and periarticular muscle. This study aims to assess the prevalence of vitamin D deficiency in temporomandibular disorder (TMD) patients. Materials and methods: This is a cross-sectional study. Subjects were assigned into two groups based on having signs and symptoms of TMD: Group 1: subjects had TMD, and group 2 healthy group (control group). The serum level of vitamin D was measured in the two groups. The independent t test was used to compare the serum level of vitamin D between the study and control groups. Results: One hundred ten subjects were studied into two groups (55 subjects in each group). The mean serum level of vitamin D was 18.13 ± 6.38 ng/mL in the study group and 31.83 ± 7.00 ng/mL in the control group. Analysis of the data demonstrated a significant difference in the mean serum level of vitamin D between the study and control groups (p = 0.001). Conclusion: It seems the serum level of vitamin D is lower in TMD patients than in the healthy control group.

Comparison of the Effect of Sling and Single Interrupted Sutures on Periodontal Parameters after Surgical Extraction of Impacted Mandibular Third Molars.

OBJECTIVES: This study aimed to compare the sling and single interrupted sutures regarding dehiscence, probing pocket depth (PPD), and clinical attachment loss (CAL) of adjacent second molars after surgical extraction of impacted or semi-impacted mandibular third molars. MATERIALS AND METHODS: This randomized clinical trial, with a split-mouth design, involved 25 patients with similar bilateral impaction of their mandibular third molars. The same surgeon performed surgical procedures, including a triangular flap and osteotomy. After surgical extraction of third molars, the distal surface of the flap was sutured with sling sutures on one side and single interrupted sutures on the other side. The allocation of suture type to the side of the jaw was random, and the patient was blinded to it. Patients were examined for dehiscence after 7 and 14 days. The PPD and CAL were recorded at the baseline and after 17 weeks. Data were analyzed using the Wilcoxon signed-rank test and generalized estimating equation (GEE) regression model. RESULTS: The sling suture was significantly superior regarding the improvement of PPD (P=0.041) and CAL (P=0.016). The dehiscence was significantly smaller in the single interrupted suture group 7 days postoperatively (P=0.059). This difference was not significant 14 says postoperatively (P=0.852). CONCLUSION: The results of this study show that the sling suture was superior to the single interrupted suture regarding PPD and CAL. However, the technique of suturing does not seem to have a significant long-term effect on wound dehiscence.

Does Open Rhinoplasty Alter Voice Quality?

PURPOSE: The voice can change after upper airway manipulation. The present study evaluated voice change after open rhinoplasty. MATERIALS AND METHODS: The present cross-sectional study was conducted on patients undergoing open rhinoplasty. Three acoustic parameters (frequency, bandwidth, and amplitude) were evaluated before open rhinoplasty and then 3, 7, and 10 months after the operation. Patients' sounds when pronouncing M, N, and A were examined. Acoustic factors were measured at the first and second nasal murmurs. Time was a predictive factor and multiple acoustic parameters were the outcome of the study. RESULTS: Twenty-five patients were studied. Amplitude and bandwidth decreased, whereas frequency increased, when pronouncing the vowel A after rhinoplasty. In contrast, for consonants M and N, amplitude decreased, whereas bandwidth and frequency increased, after rhinoplasty. CONCLUSION: Open rhinoplasty seems to affect voice quality. Open rhinoplasty altered the frequency, amplitude, and bandwidth of vowel and consonant sounds during 10-month follow-up.