Peri-implant bone defects: A 1-year follow-up comparative study of use of hyaluronic acid and xenografts.

OBJECTIVE: The aim of this study was to compare the efficacy of hyaluronic acid (HA) and xenografts on the repair of peri-implant dehiscence-type bone defects occur during implant placement. PATIENTS AND METHODS: Forty-two dehiscence Class I type defects located on the buccal surface of the implants were included in this study. Defects were divided into two main groups as small sized (height of <3 mm) and medium sized (height between 3 and 5 mm). Both of the main groups were further divided into two subgroups as HA plus xenograft plus collagen membrane (HAXC) or xenograft plus collagen membrane (XC) applied groups. After grafting, repair of defect site was evaluated with the help of the cross-sectional images on cone-beam computed tomography at 6th and 12th months. RESULTS: In both main groups, vertical bone height (VBH) was higher in defects repaired with HAXC (2.65 ± 1.12 mm) than in the XC (2.45 ± 1.10 mm) groups at the 6th month. However, the difference between two subgroups was not statistically significant (P > 0.05). Reduction in VBH was observed up to 6-12 months after prosthetic loading in all defect sites. This reduction was found statistically significant in medium-sized defects that grafted with XC (P < 0.05, paired t-test). However, in other subgroups, the difference between measurements at 6th and 12th months was not statistically significant (P > 0.05). CONCLUSIONS: According to the data obtained from this study, it can be concluded that HA did not have a significant positive effect on the repair of defects around dental implants.

An In-vitro study on thermal changes during implant drilling with different irrigation volumes.

OBJECTIVE: Irrigation with saline is one of the essential methods for reducing the heat generated during dental implant osteotomy. High irrigation volume impairs visibility of the surgical field, thus complicates the surgery. In this study, we aimed to determine the optimal irrigation volume for heat reduction during dental implant drilling. MATERIALS AND METHODS: Thirty-two implant osteotomies were prepared on four fresh cow ribs. Heat generated during the final implant drilling was measured both with infrared thermography and thermocouple method. Initial and maximum temperatures were measured at four different irrigation volumes; 32, 44, 56, and 68 ml/min. RESULTS: Both measurement methods showed that the amount of temperature rise is associated with the irrigation volume during implant drilling. There is no further decrease in temperature rise above irrigation volume of 56 ml/min. CONCLUSION: Saline irrigation with 56 ml/min provides sufficient heat reduction during dental implant drilling and higher irrigation volumes are not necessary.

Demodex folliculorum in polycystic ovary syndrome patients.

OBJECTIVE: In this study, we aimed to investigate frequency of Demodex (D.) folliculorum infestation in Polycystic Ovary Syndrome patients. PATIENTS AND METHODS: The study population consisted of 30 PCOS patients and 30 matched healthy control subjects admitted to the Hospital of Mustafa Kemal University, Gynecology and Obstetrics Clinic between March 2013 and January 2014. The demographic characteristics of the patients were recorded. Samples from the face region of the subjects were taken by standard method of superficial skin biopsy and evaluated by microscopy. Presence of five or more D. species in a cm2 was considered as positive. RESULTS: There were no significant differences in age, body mass index, diabetes mellitus incidence between PCOS patients and the control group. However, D. folliculorum infestation was found to increased in PCOS patients (n = 9; 30%) when compared to the control group (n = 2; 6, 7%) (p: 0.04). CONCLUSIONS: Our study results revealed that Demodex folliculorum appearance increased in PCOS patients.