Effect of three common desensitizers in reduction of the dentin hypersensitivity after periodontal surgery

Statement of Problem: Dentin hypersensitivity is one of the most common complaints of patients after periodontal treatments which occur after tissue shrinkage

Objectives: The aim of this study was to determine and compare the effectiveness of sensikin gel [10% potassium nitrate and 0.22% sodium fluoride] with sodium fluoride gel [2.7%] and fluoride varnish [5%] in reducing the dentin hypersensitivity after periodontal surgery

Materials and Methods: Twenty-two patients who, after full mouth periodontal surgery, had a complaint of dentin hypersensitivity [DH] in at least three quadrants were selected. Then a specific treatment was randomly selected for each quadrant which was applied once a day for one week and then stopped. A visual analog scale [VAS] was used to assess the subjects' responses to air blast and periodontal probe stimuli at baseline at one week, and one, three and 6 months after treatment. To analyze the data, repeated measures ANOVA test, Tukey test and variance analysis test were used

Results: At all given intervals, almost both sodium fluoride and sensikin gel significantly reduced the dental sensitivity caused by stimulants. There were no significant differences between sensikin gel and other two desensitizers in reducing the dentin hypersensitivity after 1 week, 1 month, 3 months, and 6 months with respect to air blast stimuli. Sensikin gel was more efficient than Fluoride varnish in reducing the sensitivity caused by periodontal probe after 1 month

Conclusions: Sensikin gel, sodium fluoride gel and fluoride varnish can all be prescribed to reduce dental sensitivity in patients who have undergone periodontal treatments. In the case of severe sensitivity to mechanical stimulations, a treatment with a long-run effectiveness such as sensikin and/or sodium fluoride gel is preferred

Comparison of bone biomechanical behavior around three different mini-implant systems employing finite element method

Placement of mini-dental implants when single-tooth restorations are needed and the space is not sufficient to insert a standard diameter implant is indicated. There are many different mini-implant brands with various materials and surface characteristics; however, there are just few studies comparing them with each other.: In this study, finite element analysis [FEA] was applied to evaluate stress distribution in two different types of bone [D2, D3] around three different mini-implant systems [Dio, Dentis, and Osteocare]. Three different mini- implant systems consisting of Dentis [Dentis Co., Ltd., Dalseo-gu, Daegu, Korea], Dio [DIO Medical Co., Jungwon-gu Seongnam-si, Kyunggi-do, S.Korea] and Osteocare [OsteoCare™, Slough, Berkshire, UK] were evaluated using FEA. At the same time, a vertical loading of 100N and a lateral loading of 30N at an angle of 45° were applied on the coronal part of the abutment in 2 different bone qualities: D2 bone quality, a thick layer [2 mm] of the compact bone surrounding a core of dense trabecular bone; and D3 bone quality, a thin layer [1 mm] of the cortical bone surrounding a core of dense trabecular bone of favorable strength. Stress levels in the bone surrounding mini-implants were analyzed using Ansys software [Ver.14], which provides the ability to simulate every structural aspect of a product. Descriptive statistics were used to compare the results. After applying the loads and performing FEA, it was observed that in all three types of mini-implants for both static and dynamic analyses, the Von Mises stress values in D3 bone were more than those in D2 bone. The stresses in the cortical bone were obtained more than cancellous bone stresses. In all the studied systems, stress remained in the physiologic limits of the bone. In the cortical bone, stress distribution pattern in the three kinds of mini-implant was similar. Crestal bone stress, according to the amount of force applied, remained in acceptable levels

Morphometric changes of the socket after site preservation using nanobone and collagen membrane or stypro versus extraction alone

The long-term success of a dental implant relies on implant osseointegration into native and viable bone, implant placement in an ideal position, and optimal hard and soft tissue contour. This requires the presence of sufficient alveolar bone volume, good alveolar ridge [Practically with no sign of atrophy] and good surgical technique. The aim of this randomized controlled clinical study was to evaluate morphometric changes after different alveolar ridge preservation procedures.In this study, 33 patients who had single-rooted premolar, which needed to be extracted, were recruited. Patients were randomly divided into 3 groups and after tooth extraction the following treatments were administered: in group A: NanoBone and a collagen membrane; in group B: NanoBone and Stypro; and in group C: natural healing. The following clinical parameters were evaluated at baseline and 6 months after the extraction: buccolingual width, midbuccal height [with the use of a custom made stent] and width of keratinized gingiva. For data analysis, Paired t-test,one-way ANOVA and Tukey's tests were used.The average reduction in the buccolingual width, midbuccal height and keratinized gingiva was as follows: group A: 1.18 +/- 0.6, 0.64 +/- 0.92 and 3.45 +/- 1.75 mm; group B: 2.18 +/- 0.75, 0.73 +/- 0.78 and 4.73 +/- 0.9 mm; and group C: 1 +/- 0.89, 2.36 +/- 1.21 and 5 +/- 0.63 mm, respectively. Moreover, a significantly reduced resorption was found in both the buccolingual width and the width of keratinized gingiva in group A as compared to groups B and C [p<0.05].This study showed that the use of collagen membrane+Nano bone [group A] can significantly reduce the horizontal resorption of the alveolar ridge and keratinized tissue more effectively than stypro+Nano bone [group B] and blood clot alone and natural healing [group C]