Effects of silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets

OBJECTIVE: The aim of this study was to evaluate the effects of tribochemical silica coating and silane surface conditioning on the bond strength of rebonded metal and ceramic brackets. MATERIAL AND METHODS: Twenty debonded metal and 20 debonded ceramic brackets were randomly assigned to receive one of the following surface treatments (n=10 for each group): (1) sandblasting (control); (2) tribochemical silica coating combined with silane. Brackets were rebonded to the enamel surface on the labial and lingual sides of premolars with a light-polymerized resin composite. All specimens were stored in distilled water for 1 week and then thermocycled (5,000 cycles) between 5-55ºC. Shear bond strength values were measured using a universal testing machine. Student's t-test was used to compare the data (α=0.05). Failure mode was assessed using a stereomicroscope, and the treated and non-treated bracket surfaces were observed by scanning electron microscopy. RESULTS: Rebonded ceramic brackets treated with silica coating followed by silanization had significantly greater bond strength values (17.7±4.4 MPa) than the sandblasting group (2.4±0.8 MPa,

Sürnümerer premolar (parapremolar) dişler: olgu sunumu

ÖZET Sürnümerer dişler normal diş sayısından fazla olan dişler olarak tanımlanmaktadır. Hem süt hem de daimi dentisyonda sürnümerer dişlere rastlanabilir. Etiyolojileri tam olarak bilinmemek-tedir. Genelde gömülüdürler ve radyografilerde tesadüfen görülürler. Tek taraflı, çift taraflı, tek veya çok sayıda bir çenede veya her iki çenede de bulunabilirler. Bu olgu sunumunda alt çenede dört adet sürnümerer premolar dişlere sahip bir vakada tanı ve tedavi yaklaşımları sunulmaktadır. Anahtar kelimeler: Sürnümerer diş, sürnümerer premolar, suplemental, panoramik radyografi, parapremolar   ABSTRACT Supernumerary teeth are described as the teeth formed in excess of the normal dental formula. They have been reported in both the primary and the permanent dentition. Their etiology is still not clearly understood. They usually do not erupt and are seen incidentally on radiographies. Supernumerary teeth may occur singly, multiply, unilaterally or bilaterally and in one or both jaws. In this case report, diagnosis and treatment approaches of a patient with four supernumerary premolar teeth in mandibula are presented. Key words: Supernumerary tooth, Supernumerary premolar, supplemental, panoramic radiograph, parapremola

Determination of Orthodontic Treatment Need for Individuals in Pubertal Growth Period and Effects of Different Variables on the Treatment Needs with Using the ICON Index

Aim:To evaluation of orthodontic treatment need for individuals who are in pubertal growth period with using the ICON index and whether treatment need change according to gender, dental, sagittal and vertical skeletal malocclusions.Subjects and Method:In this study, pretreatment orthodontic casts and panoramic films of 138 patients (75 females, 63 males and mean age 13.8 ± 1,2) were investigated by using ICON index.Results:91 of 138 patients (%65,9) were found to be need for orthodontic treatment. Although it is not statistically significant, females in genders (%69,3), Class III patients in dental malocclusions % 71,4), and Class I and Class III anomalies in sagittal skeletal malocclusions were found higher than the others. Also, in vertical skeletal malocclusions, orthodontic treatment needs of hyper-diverjant patients % 79,3) were found statistically higher than the others.Conclusion:The majority of individuals who were in pubertal growth period were female (% 54,3), dental Class II (% 70,3), skeletal Class I malocclusion (%55,8) and normo-diverjant (%47,8). It was seen that when the vertical direction growth increased, the need for orthodontic treatment increased. As a result, studies about indexes should be done for comparison, sharing and proliferation of new information, and patients determination for orthodontic treatment should be done according to treatment needs rather than Angle classifications

Effects of Transillumination Method on Bond Strenght of an Orthodontic Adhesive

The purpose of this study was to determine the effect of transilüminasyon on the bond strength of orthodontic brackets. One hundred human maxillary premolars were used in this study. Brackets with orthodontic composite adhesive were placed on the labial surface of the premolars and light cured from either the labial and/or the lingual (transilüminasyon). The control sample was cured from the labial for a total of 40 seconds of light exposure. Experimental samples were cured from the buccal for 20 seconds, the lingual (transilüminasyon) for 20 or 40 seconds and both buccal and lingual for 40 seconds. The shear-peel bond strengths were tested at 24 hours after light application. The results of this study demonstrated statistically significant difference between 40 seconds of labial curing, the both buccal and lingual curing and the only lingually cured groups. Actual bond strengths were lower for only lingually cured samples but higher for the both buccal and lingual cued sles. The samples tested received 20 seconds of labially cured were nearly the same as the control values. This study demonstrated that transilüminasyon of maxillary premolars is not alone an acceptable method of cunng orthodontic adhesive. However, the bond strengths can be higher when the transilüminasyon is used in addition to the buccal curing particularly if the exposure time is inceased to 40 seconds

Kemik rezorbsiyonunda rol alan ve mini implantların başarısını etkileyen faktörlerin incelenmesi

Proje -- Kırıkale Üniversitesi2008-560087230

Use of Class Fiber to Reinforce Ortohodontic Plates Against Mechanical Forces

This study investigated the different effects of quantitative percentages of glass fiber intensity on the transverse strength and maximum deformation of orthodontic acrylic resin. Forty specimens were formed in a specially designed mold to produce identical specimens in accordance with the manufacturer's recommendations. Four different percentages of glass fiber reinforcements in loose random form were studied. Each glass fiber treatment percentage (0%, 1%, 2%, 5%) was related to the total powder/liquid mass. The results indicated that 2% glass fiber treatment enhanced the transverse strength of the tested specimen. Maximum deformation at failure in the tested treatment groups was found to be different. The interaction of glass fiber concentration on fracture strength and deformation was significant. In conclusion the 2% glass fiber concentration was found to yield optimum fracture strength and deformation results. Increased amount of glass fiber incorporation resulted in decreased mechanical properties of the resin

White Spot Lesions After Orthodontic Treatment: Who Should Treat?

The aim of this study was to evaluate alternative treatment methods of the white spot lesions after orthodontic treatment, and also to discuss which department must treat these lesions. Orthodontics or restorative dentistry? BIn general, applications of the microabrasion technique to remove white spot lesions were very effective in the mild and sever lesions but in the deep cavitation lesions composite restorations are inevitable

Sürnümerer premolar (parapremolar) dişler: olgu sunumu

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 </style> <![endif]--> <p class="MsoNormal" style="text-indent: 14.2pt; background: none repeat scroll 0% 0% white;"><strong><span style="font-size: 10pt;"><a href="http://www.google.com.tr/url?sa=t&source=web&cd=1&ved=0CBcQFjAA&url=http%3A%2F%2Fwww.ozetkitap.com%2F&ei=8jOuTIzhB9fQ4wb_0OiHBg&usg=AFQjCNGuJMT9pBO6jP7uiv_4dsYurtJfDg"><span style="color: windowtext; text-decoration: none;">Ö</span></a>ZET</span></strong></p> <p class="MsoNormal" style="text-align: justify; text-indent: 14.2pt;"><span style="font-size: 10pt;">Sürnümerer dişler normal diş sayısından fazla olan dişler olarak tanımlanmaktadır. Hem süt hem de daimi dentisyonda sürnümerer dişlere rastlanabilir. Etiyolojileri tam olarak bilinmemek-tedir. <span>Genelde gömülüdürler ve radyografilerde tesadüfen görülürler.</span> Tek taraflı, çift taraflı, tek veya çok sayıda bir çenede veya her iki çenede de bulunabilirler. <a name="OLE_LINK2"></a><a name="OLE_LINK1"><span>Bu olgu sunumunda alt çenede dört adet sürnümerer premolar dişlere sahip bir vakada tanı ve tedavi yaklaşımları sunulmaktadır.</span></a></span></p> <p class="MsoNormal" style="text-align: justify; text-indent: 14.2pt;"><strong><span style="font-size: 10pt;">Anahtar kelimeler:</span></strong><span style="font-size: 10pt;"> Sürnümerer diş, sürnümerer premolar, suplemental, <span>panoramik radyografi, parapremolar</span></span></p> <p class="MsoNormal" style="text-align: justify; text-indent: 1cm;"><strong><span style="font-size: 10pt;"> </span></strong></p> <p class="MsoNormal" style="text-align: justify; text-indent: 14.2pt;"><strong><span style="font-size: 10pt;">ABSTRACT</span></strong></p> <p class="MsoNormal" style="text-align: justify; text-indent: 14.2pt;"><span style="font-size: 10pt;" lang="EN-US">Supernumerary teeth are described as the teeth formed in excess of the normal dental formula.</span><span style="font-size: 10pt;" lang="EN-US"> They have been reported in both the primary and the permanent dentition. Their etiology is still not clearly understood. <span>They usually do not erupt and are seen incidentally on radiographies<em>.</em></span> Supernumerary teeth may occur singly, multiply, unilaterally or bilaterally and in one or both jaws. In this case report, diagnosis and treatment approaches of a patient with four supernumerary </span><span style="font-size: 10pt;" lang="EN-GB">premolar</span><span style="font-size: 10pt;" lang="EN-US"> teeth

The Photographic comparison of enamel surfaces roughened by different methods

Amaç: Bu çalışmanın amacı üç farklı mine pürüzlendirme metodunun mine yüzeyine etkisini incelemek ve mine yüzeyleri üzerine en az zararlı olan pürüzlendirme yöntemini saptamaktır. Yöntem: Yeni çekilmiş 30 adet küçük azı dişi rasgele üç gruba ayrıldı. Grup I (n10) %37’lik ortofosforik asit ile asitlendi. Grup II (n10) %18 HCL ve pomza karışımı ile pürüzlendirildi (mikrabrazyon). Grup III (n10) ise 50 ? çapında alüminyum oksit kullanılarak kumlandı. Dijital fotoğraf makinesi kullanılarak standart uzaklıktan vestibül yüzey fotoğrafları alındı ve bu fotoğraflar skorlandı. Tanımlayıcı istatistikler her bir grup için yapıldı. Fotoğraf görüntülerinin karşılaştırılmasında Wilcoxon Signed Ranks testi kullanıldı. P değeri .05 ten küçük olanlar istatistiksel olarak anlamlı olarak değerlendirildi. Bulgular: Grupların hepsinde mine yüzeyi pürüzlenmesi görüldü. En belirgin pürüzlenmenin Grup I’de, en az pürüzlenmenin ise Grup II’de meydana geldiği izlendi. (P0,03) Sonuçlar: Alternatif bir mine pürüzlendirme yöntemi olan %18 HCL ve pomza karışımı ile mikroabrazyon işlemi orijinal mine yüzeyine en yakın görüntüleri vermiştir. Mikroabrazyondan sonra mine yüzeyinde meydana gelen ince cilalı yüzey ortodontik tedavi süresince dental plağın kontrolünde kolaylık sağlamaktadır.Objective: Aim of this study was to investigate the effect of three different roughening methods on the enamel surface, and also to determine less harmful the roughening method on the enamel surfaces. Materials and Methods: Newly extracted thirty premolar teeth were divided into three groups randomly. Group I (n10) were etched with 37% phosphoric acid. Group II (n10) were roughened with 18% HCL and pumice mixture (microabrasion). Group III (n10) were sandblasted with 50 µ aluminum oxide particles. Standardized surface photographs were taken by using a digital photograph machine, and these photographs are scored. The descriptive statistics were calculated for each group. Wilcoxon Signed Ranks was executed to evaluate differences of scores. P values less than to .05 were considered statistically significant. Results: Enamel roughening was observed in all groups, with the most extensive roughening in Group I and the smallest in Group II. There was appeared that microabrasion method gave clinically the finest enamel surface. (P0.03) Conclusions: Microabrasion with 18% HCL and pumice mixture which alternative enamel roughening method has given very close appearances to original enamel surface. Fine polished enamel surfaces occur after the microabrasion convenience of dental plaque control during orthodontic treatment