Sari F, et al. J Adv Prosthodont. 2016 Aug;8(4):267-274. https://doi.org/10.4047/jap.2016.8.4.267

Different fixation techniques have been used for stabilization of autotransplanted teeth. Because rigid or extended fixation periods can cause complications such as ankylosis and disturbances of pulpal revascularization, our aim was to evaluate an alternative technique, a removable splint, for improving the success rate of autotransplanted molar teeth. In 44 patients, (20 male and 24 female patients), 45 transplanted teeth were analyzed. These cases were followed for 31 to 47 months after operation. Transplanted teeth were evaluated after use of a thermoplastic retainer for 1 month, in terms of success rate and dissatisfaction with this apparatus. The primary stability, ankylosis, and root resorption were also analyzed. To date, 1 transplant was extracted after 6 months due to unpreventable periapical root inflammation, and 2 transplants were extracted after one year due to external root resorption. Although 2 ankylosed transplants were still functional after an average follow-up period of three years, with no dissatisfaction by the patients, these cases were treated as failures because of the probable risk for external root resorption. The remaining 40 (88.8 % success rate) transplants remained asymptomatic and functioning for a mean follow-up period of 37 months. In the assessment of dissatisfaction with the thermoplastic retainer, 36 (81.8 %) patients had no or little dissatisfaction, 4 (9 %) patients had very appreciable or excessive dissatisfaction, and 4 (9 %) patients had moderate dissatisfaction. A thermoplastic retainer for use after autotransplantation of third molar teeth is a reasonable and useful method and a good alternative to conventional rigid or semi-rigid splints. This technique was especially useful in autotransplanted teeth that had poor stability, i.e., in cases in which it is conventionally advised to use long-term rigid or semi-rigid splints.

Objective: In dentistry, different products are being developed in order to shorten the chairside but the interactions between these materials needs further investigations. This study aims to investigate the two different short time sintering protocols on monolithic multilayered zirconia’s surface roughness (SR), translucency parameter (TP), and contrast ratio (CR). Material and Methods: Twenty monolithic multilayer zirconia specimens were prepared with the dimension 10x10x1 mm and divided into two sintering groups (speed sintering group 30 min at 1510 ⁰C, high speed sintering group 10 min 1580 ⁰C) and SEM analyzed were performed. Surface roughness tests were performed by using profilometer and optical measurements were performed by using spectrophotometer. The data was statistically analyzed by using Wilcoxen test at the 0.05 probability level. Results: SR values and CR did not show any significant difference at any layer of any group. In all parts of monolithic multilayered zirconia, the difference of TP between sintering groups were statistically significant (P<.05). Conclusion: High speed sintering parameters has promising effects on monolithic multilayered zirconia with combined acceptable optical properties. Because of their different content, different layers show different reactions in terms of contrast ratio and translucency parameters and these changes should be taken into account in treatment planning.

Objectives: To investigate the potential relationships between the intensity of tinnitus associated with temporomandibular disorders (TMD) and potential etiologic factors, including age, gender, freeway space, sleep bruxism (SB), joint clicking, and headache. Methods: The sample was comprised of 90 patients without any hearing loss, as confirmed by otorhinolaryngology, who self-reported subjective tinnitus and simultaneous TMD, based on the Research Diagnostic Criteria for TMD (RDC/TMD). Results: The results showed a positive, weak correlation between the intensity of tinnitus and age (r = 0.225, p = 0.033). The presence of SB and headache were seen in higher proportions in the present sample, at 75.5% (n = 68) and 66.6% (n = 60), respectively. Conclusions: In a population of patients with subjective tinnitus and TMD, no significant associations were found between tinnitus intensity and age, freeway space, SB, clicking presence, and headache, though gender did show a weak correlation with tinnitus intensity.

Objective: The bonding ability of intraradicular posts is important for successful restoration. Lasers have been used for this purpose. Both for post space conditioning and irrigation activation with lasers are interesting choices. The aim of this investigation was to evaluate the bond strength of fiber posts created via different irrigation and laser etching protocols on post spaces and different sealers. Methods: Ninety-six mandibular premolar teeth were randomly assigned to two main groups. GuttaFlow Bioseal and MTA Fillapex root canal sealers were used for obturation. Different irrigation and laser etching protocols for post spaces were used to perform subgroup procedures. One main group was filled with GuttaFlow Bioseal, and the other was filled with MTA Fillapex. The main groups were then subdivided according to the irrigation and laser etching protocols on the post spaces. The fiber posts were cemented and then transversally sectioned. Push-out tests were performed. The push-out strength values were subjected to statistical analysis. Levene’s homogeneity test was used to examine normally distributed variables. The group results were analyzed via two-way ANOVA to evaluate the effects of sealer type, post space preparation, irrigation system and their interactions. Results: The impacts of various post space conditions on the bond strength were not observed. (p > .05). However, a significant difference was reported between the two different sealers (p < .05). Conclusions: Post space conditioning procedures did not significantly affect the bond strength values. However, sealer alteration affected the bond strength values.

Aim: This study evaluates the digital accuracy of posterior implant scans and contralateral molar tooth scans obtained with three different intraoral scanners. Materials and Methods: Using a transfer analog, a Frasaco maxillary model was prepared with a Megagen scan body positioned in the left maxillary molar region. An experienced operator (n = 10) performed all scans with an industrial optical reference scanner and intraoral scanners (Medit i700, TRIOS 3, and TRIOS 5). Scan accuracy was assessed using Geomagic Control X software based on 3D trueness and precision accuracy analysis. One-way ANOVA and Tukey’s HSD tests were applied to identify statistically significant differences in trueness and precision (α = 0.05). Results: In the implant region, TRIOS 5 demonstrated significantly different 3D trueness results and was more successful than TRIOS 3. Medit i700 yielded results comparable to those of TRIOS 3 and TRIOS 5 (p = 0.011). TRIOS 5 exhibited less successful 3D trueness results than the other scanners in the molar region (p = 0.001). No 3D precision differences were observed among intraoral scanners in the implant region (p = 0.561). Medit i700 presented the most favorable precision results in the molar region (p = 0.01). Conclusions: TRIOS 5 supports high impression accuracy and passive fit, while Medit i700 offers more reliable accuracy for contralateral molar scans, which can affect the digital occlusal record.