Estetik Diş Hekimliğinde Renk Seçimi

Günümüzde ilerleyen teknoloji ile birlikte hastalar diş hekimine sıklıkla estetik restorasyonlar için başvurmaktadır. Diş hekimlerinin hastalara estetik bir görüntü sunabilmek için yapılacak restorasyonda dikkat edilmesi gereken en önemli unsurlardan biri renktir. Rengin bağlı olduğu üç faktör vardır; gözlemci, obje ve ışık kaynağı. Bu üç faktörden herhangi biri değişirse, rengin algılanması da değişir. Rengin özelliklerini anlatmak için çeşitli sistemler geliştirilmiştir. Munsell Renk Sistemi en çok kullanılan sistemlerdendir. Bu sistemde rengin hue, value ve chroma olmak üzere üç boyutu bulunmaktadır. Hue rengin kendisini (yeşil, kırmızı, mavi gibi), value parlaklığını, chroma ise yoğunluğunu ifade eder. CIELab ise rengi L*,a*,b* olarak üç eksende tanımlayan başka bir sistemdir.Renk seçimi görsel ve aletli renk seçimi olmak üzere ikiye ayrılır. Diş hekimleri hastaları için en uygun diş rengini seçmeli ve bu bulguyu teknisyene doğru aktarmalıdır. Görsel renk seçiminde renk skalaları kullanılır. Bu yöntem subjektiftir ve kişiden kişiye değişebilir.  Ayrıca gözlemcinin cinsiyeti, yaşı, kültürel geçmişi, göz yorgunluğu ve ortama bağlı faktörler ile değişebilir. Ancak görsel renk seçimi halen diş hekimliğinde en sık kullanılan renk seçim yöntemdir. Daha estetik ve güvenilir sonuçlar elde edebilmek için aletli renk seçim yöntemleri geliştirilmiştir. Bu yöntemde spektrofotometre, kolorimetre ve dijital kameralar kullanılır. Bu cihazlar farklı şartlarda bile tutarlı sonuç verebilir ancak görsel yönteme kıyasla daha uğraştırıcı ve pahalıdır.   Anahtar Kelimeler: Dental Restorasyonlar, Diş Estetiği, Renk Seçim

EVALUATION OF FLUOURESCENCE DEGREE OF DIFFERENT RESTORATIVE MATERIALS USING LASER DIAGNOSTIC SYSTEM

In this study, the evaluation of flouresence of various restorative materials and different colors of the two restorative materials by using Laser Fluouresence Diagnostic System was aimed. Cavities were prepared on the occlusal surfaces of the unerupted third human molars. Glass ionomer cements, compomer, and resin composite materials were placed and laser fluoresence was measured by Kavo DIAGNOdent laser device. Data were statistically analyzed with Kruskal-Walls test, Darkest shade of Valux resing compostie (A3.5) and Dyract compomer (C2, C3, A4) were found to have less fluoresence than the ligher shades. These differences ares similar to obtained from sound tooth structures and decay. It will be better of flouresence laser diagnostic device is not used alone for examination of restored teeth by esthetic restorative materials

PIT AND FISSURE SEALANTS AND ITS APPLICATIONS

Fissure Sealants are resin-based materials that are applied to the pits and fissures in tooth in preventing tooth cavities. The success of the fissure sealants depends on degree of binding with tooth surface and isolating capacity the pit and fissures from the mouth environment. The narrow width and irregular depth of the fissures creates an ideal milieu for the accumulation of acid producing bacteria. The cleaning function of saliva are insufficient for the pits and fissures in grinders. Besides the diameter of bristles of toothbrush are too big for cleaning the fissure surface. Fissure sealants act as a physical barrier for the acids produced in bacteria plaque. While the application of the traditional fissure sealants is providing an accetable protection in cavity process; it is also a non-invasive technic that is protecting tooth integrity. Lately the application of the protective and primary care treatmants has become considerably rare and it began to be percieved as insignificant by the dentists. The purpose of our study is to extend the use of fissure sealants by the dentists with creating a better understanding on the importance of fissure sealants, and also explaining the application areas clearly

Effects of In-Office Bleaching Agents on Surface Roughness of Nanofilled Composite Resin Surface

Aim: The aim of this study was to evaluate the effects of 2 bleaching agents on the surface roughness of nanofill composite resin finished with different polishing procedures. The hypothesis was that bleaching would have no effect on the surface roughness of the nanofill composite resin. Materials and Methods: A total of 108-disc samples were prepared from a nanofill composite resin and randomly divided into three groups (n=36). Group I served as control group without polishing regimen. Group II was polished with Sof-Lex systems medium, fine and superfine alumi- num oxide-impregnated discs for 15s. Group III was polished with OneGloss discs for 30s. Following polishing, the baseline surface rough- ness values were measured using a profilometer. Then each group were further divided into 2 subgroups and bleached by one of the in-office bleaching agents tested. The Opalescence Boost and Opalescence Quick agents were applied on to the surface of the samples according to the manufacturer’s recommendations. At the end of the bleaching procedures, roughness was measured again. The statistical analysis was performed by Mann-Whitney U, Kruskal Wallis and Wilcoxon Signed Ranks test (p<0.05). Results: After bleaching, surface roughness significantly increased in all groups compared to baseline (p=0.001). The highest mean initial surface roughness value was observed in OneGloss, followed by Sof-Lex and Control group (p<0.01). Among all groups, the % change in Ra values caused by the use of both bleaching agents was highest in the unpolished group (control) (p<0,01). In addition, no statistical difference was observed between the % change in Ra on the surfaces polished with Sof-Lex and OneGloss (p>0.05). Conclusion: The hypothesis was rejected. The simulated bleaching with 40% HP or 45% CP increased the surface roughness of the nanofill composite. However, it has been observed that the Ra threshold value does not exceeded the clinically acceptable value of 0.2 μm after bleaching if an ideal finishing procedure was undertaken

DETERMINATION OF DENTAL EDUCATION STRESS AMONG DENTAL STUDENTS

The aim of our study to determine dental education stress factors among dental students. Within dentistry faculty, the questionnaire was applied to number of 146 female and 104 male students and the results evaluated as a percentage. In this study, it was determined that clinical factors are found more stressful, living conditions and personal conditions are found less stressful by the dental students

MICROHARDNESS OF THE APPROXIMAL AND PULPAL SURFACES IN CLASS II COMPOSITE RESTORATIONS: AN IN VITRO STUDY

The aim of this in vitro study was to examine the surface microhardness of composite resin materials when placed in class II cavities using two different matrix systems (Quickmat, Polydentia and Lucifix, HaweNeos). A hybrid composite (Tetric EvoCeram-Ivoclar Vivadent), two nanohybrid composites (Grandio-Voco, Synergy D6-Coltene/Whaledent) and a nanofil composite (Filtek Supreme XT-3M Espe) were placed in the silicon dublicates of class II cavities which were primarly prepared in plastic teeth without levels (4x4x4) mm (n=160). The cavity was prepared in plastic teeth (4mm bucco-lingual x 4 mm depth x 3mm mesio-distal) (KaVo, EWL model). Cavosurface margins were not beveled. The impressions of the tooth with the cavity preparation were taken using polyvinyl siloxan(Speedy/PuttyLigth-Coltene). A silicon material (AffinisPrecious-Coltene) was injected in the impressions and a silicon mold of the teeth and the cavity were obtained. The prepared silicon teeth were mounted in plastic jaw (KaVo, EWL model) to simulate proximal contact. Metal sectional matrix (Quickmat-Polydentia) (n=20) and clear matrix system (Lucifix-HaweNeos) (n=20) were prepared for each tooth. Wedges were used to stabilize the matrix. The cavities were restored incrementally in oblique layers with all four restorative materials. And each increment was light cured for 40 s (Celalux-Voco). The restorations were then removed from the cavities and surface hardness of the proximal and axio-pulpal surfaces were immediatly measured with Microhardness Vickers Test device (Clemex CMT 7, Clemex Labs.). Data were statistically analyzed with one way ANOVA and Tukey's Multiple Comprassion test. No significant differences were found between metal matrix and clear matrix (p>0.05). Microhardness of axio-pulpal surfaces were found significantly lower than the proximal surfaces for each restorative materials (p<0.05). Metal or clear matrix systems both could be used in the class II cavities in regard the surface microhardness of composite resins materials