Effect of Saliva Contamination Stage and Different Decontamination Procedures on Bonding Strength of Resin-Modified Glass Ionomer / 대한소아치과학회지

The purpose of this study was to compare the bond strength of resin-modified glass ionomer (RMGI) to dentin with saliva contamination at different stages and using different decontamination procedures.Extracted human permanent molars were embedded onto acrylic resin with the dentin surface exposed. Group I was a control group that was conditioned with polyacrylic acid (PAA). Groups II and III were contaminated with saliva before PAA conditioning and Groups IV, V, and VI were contaminated with saliva after PAA conditioning. After saliva contamination, Groups II and IV were dried, Groups III and V were rinsed and dried, and Group VI was additionally conditioned with PAA. After surface treatment, the dentin specimens were filled with RMGI.Group I showed significantly higher bond strength than the other groups. Group VI showed a significantly higher bond strength than the other saliva contaminated groups. However, there were no significant differences in the failure mode between the different groups.Saliva contamination impaired the bond strength of RMGI to dentin, regardless of when the saliva contamination occurred. Decontamination with washing and drying could not improve the shear bond strength of RMGIC. When saliva contamination occurred after PAA conditioning, additional PAA conditioning improved the shear bond strength.

Effects of Saliva Contamination on Shear Bond Strength with Conventional, Moisture Insensitive, and Self-Etching Primers / 대한소아치과학회지

The aim of this study was to compare the shear bond strengths of orthodontic bracket with Conventional primer (CP), Moisture insensitive primer (MIP), and Self-etching primer (SEP). In addition, the effect and the timing of saliva contamination on shear bond strength was evaluated.A total of 135 bovine mandibular incisors were used in the study and divided into 3 groups. Group I, II and III were used CP, MIP, SEP, respectively. Each group was then divided into three subgroups: the group without saliva contamination, the group with primer application after saliva contamination, and the group with saliva contamination after primer application. After the primer application, the metal bracket for the lower incisor was attached and the shear bond strength was measured.The mean shear bond strengths was highest with CP and lowest with SEP in dry condition. However, CP showed a significant decrease in shear bond strength in the presence of saliva contamination. MIP and SEP showed no significant decrease in shear bond strength with saliva contamination.

Comparison of Bonding Strength by Cleaning Method of Pediatric Zirconia Crown Contaminated with Saliva or Blood / 대한소아치과학회지

The objective of this study was to compare the shear bonding strength of zirconia after cleaning the crown contaminated by saliva or blood and determine the effect of thermocycling. 180 specimens were embedded in acrylic resin. 20 Specimens in the positive control group were bonded with resin cement without contamination. 20 Specimens in the negative control group were washed with water for 20 seconds and then dried for 10 seconds. 120 Specimens contaminated by saliva or blood were cleaned by using three cleaning methods: 37% phosphoric acid gel, commercial cleanse, and 2.5% NaOCl. All samples were bonded with resin cement and divided into two subgroups: One was not aged, and the other was tested with 30,000 thermocycling. In both groups contamination by saliva and blood, no statistically significant difference was not found in control, groups cleansed by commercial cleanser and 2.5% NaOCl. When the groups cleansed with water and 37% phosphate gel were compared with the control, significantly low shear bond strength was shown. Thermocycling group showed statistically significantly low shear bond stress compared to the groups without thermocycling. When zirconia was contaminated by saliva or blood, its original shear bond strength could be obtained if it was cleaned with commercial cleanser or 2.5% NaOCl.

Comparison of shear bond strength of orthodontic brackets bonded using two different hydrophilic primers: An in vitro study.

Context: Salivary control and maintenance of a dry operating field is a prime requisite of orthodontic bonding. Moisture insensitive primer (MIP) with a clinical significant bond strength values have a better edge over the conventional hydrophobic bonding systems. Aim: The aim of this study is to investigate the effectiveness of two hydrophilic primers with respect to conventional hydrophobic primer by comparing their shear bond strength (SBS) and adhesive-failure locations after contamination with saliva and saliva substitute. Materials and Methods: A total of 150 extracted human premolars were randomly divided into five group s ; Group A (Transbond MIP/saliva substitute), Group B (Opal Primo/saliva substitute), Group C (Transbond MIP/natural saliva), Group D (Opal Primo/natural saliva), control group - Group E (Transbond XT/dry), adhesive-Transbond XT used for all five groups and bonded using stainless steel brackets. Shear forces were applied to the samples with a universal testing machine. SBSs was measured in megapascals. The mode of bond failure was determined using the adhesive remnant index (ARI). Results: The mean SBS produced by Transbond MIP was higher than Opal Primo, which was statistically significant according to one-way analysis of variance. Both the tested groups showed lesser bond strength values than Transbond XT (the control). ARI scores revealed that there was no statistically significant difference in the site of bond failure between study groups. ARI scores were found to be lower for study groups suggesting adhesive failure, compared to higher ARI scores for the control group suggesting cohesive failure. Conclusion: Transbond XT adhesive with Transbond MIP or Opal Primo have clinically acceptable bond strength in wet fields. Opal Primo is a viable option to use as a hydrophilic primer clinically.

Influence of saliva contamination on the shear bond strength of adhesives on enamel

OBJECTIVE: To evaluate shear bond strength of 3 adhesive systems (Single Bond, TransbondTM MIP and TransbondTM XT) applied on bovine enamel under saliva contamination condition. METHOD: One hundred and twenty enamel surfaces of bovine incisors were divided into 6 groups (n = 20) according to the adhesive system used (TransbondTM XT, TransbondTM MIP and Single Bond) with or without saliva contamination. For each adhesive system, there were two groups defined as no contamination group (NC): 37% H3PO4 conditioning for 30 seconds and two layers of adhesive systems; saliva contamination group (SC): After the first adhesive layer application, the examined areas were contaminated with saliva. Samples were mounted appropriately for testing and stored in deionized water at 37 ºC for 7 days. Samples were then submitted to shear bond strength trials at a speed of 0.5 mm/min. The Adhesive Remnant Index (ARI) was evaluated under stereomicroscopy. Two-way analysis of variance and the Tukey test were used to compare mean values (α = 0.05). RESULTS: Groups XT (NC) = 26.29 ± 7.23; MIP (NC) = 24.47 ± 7.52 and SB (NC) = 32.36 ± 4.14 XT (SC) = 19.59 ± 6.76; MIP (SC) = 18.08 ± 6.39 and SB (SC) = 18.18 ± 7.03 MPa. ARI 0 and 1 were the most prevalent scores in all study groups examined. CONCLUSION: Saliva contamination significantly decreased bond strength of the three adhesive systems examined (p <0.05). However, the comparison of groups with and without saliva contamination did not reveal any significant differences, and, therefore, the three systems may be considered equivalent.

Effect Of Saliva Contamination And Different Decontamination Modes On Dentin Bond Strength During Bonding With Single Bottle Adhesive.

The objective of the present study is to evaluate the different mode of decontamination of saliva on dentin bond strength. Buccal/lingual surfaces of 48 extracted human molars were wet ground to create flat dentin surface, to serve as bonding area for single bond and the hybrid composite resin. The experimental teeth were then categorized into six groups of 8 teeth each and treated in the following manner. Group 1 control (without contamination), Group 2 etched surface is contaminated with saliva and saliva is decontaminated by air drying. Group 3 etched surface is contaminated and saliva was decontaminated by rinsing and blot drying.group4 uncured adhesive surface contaminated, saliva is decontaminated by rinsing and blot drying. Group 5 cured adhesive surface is contaminated, decontamination of saliva was done by rinsing and air drying. Group 6 treated similar to Group 5 with additional adhesive application after air drying. All teeth were mounted in iron mould and subjected to universal testing machine for shear bond strength. Lowest mean bond strength was found in Group2 which was significantly lower than all other Groups (p<0.01). Group5 and Group6 were significantly lower than Group1, 3 and 4. Based on this study it was found that one bottle adhesive systems are less sensitive to salivary contamination in contrast to previous generation adhesives.

Effect of saliva contamination on the bond strength of an etch-and-rinse adhesive system to dentin / Efeito da contaminação salivar na resistência de união de um adesivo etch-and-rinse em dentina

Purpose: The aim of this study was to investigate the effect of saliva contamination on bond strength of an etch-and-rinse system to dentin. Methods: Fifty bovine incisors were embedded in acrylic resin and divided into 5 groups: G1 (control) - application of the adhesive system (Adper Single Bond 2 - 3M-ESPE); G2 - saliva contamination after acid etching of dentin, rinsing and drying; G3 - saliva contamination after acid etching of dentin and drying; G4 - saliva contamination after adhesive application, rinsing and drying; G5 - saliva contamination after adhesive application and drying. Contamination was performed by using 4 µL of simulated human saliva for 20 s. The adhesive system was applied according to the manufacturer's instructions; a composite resin was built as an inverted cone and was tested after 24 h at a cross-head speed of 0.5 mm/min. Results: When saliva contamination occurred after the adhesive photo-polymerization, bond strength was significantly reduced. The adhesive strength (MPa) mean values were: G1 = 18.1(±4.7) a; G2 = 20.5(±5.7) a; G3 = 17.3(±3.4) a; G4 = 12.6(±4.0) b; G5 = 9.8(±2.1) b (means followed by distinct letters are statistically different, P < 0.05). Conclusion: Saliva contamination negatively influenced bond strength of an etch-and-rinse adhesive, especially after the final polymerization of the adhesive system; in this condition, treatments were not efficient to recover adhesion.

Objetivo: Investigar o efeito da contaminação salivar na resistência de união de um adesivo condicione-e-lave em dentina. Metodologia: Cinquenta incisivos bovinos foram divididos em 5 grupos: G1 = (controle) aplicação do sistema adesivo (Adper Single Bond 2 - 3M-ESPE); G2 = contaminação com saliva após condicionamento ácido da dentina + lavagem e secagem; G3 = contaminação após o condicionamento ácido da dentina + secagem; G4 = contaminação com saliva após a aplicação do adesivo + lavagem e secagem; G5 = contaminação com saliva após a aplicação do adesivo + secagem. A contaminação foi realizada com 4 µL de saliva humana estimulada por 20 s. O sistema adesivo foi usado de acordo com as instruções do fabricante. A resina composta foi aplicada na forma de cone invertido, com o teste de tração realizado após24 h a 0,5 mm/min de velocidade. Resultados: As médias de resistência de união (em MPa): G1 = 18,1(±4,7) a; G2 = 20,5(±5,7) a; G3 = 17,3(±3,4) a; G4 = 12,6(±4,0) b; G5 = 9,8(±2,1) b, demonstrando que a resistência de união foi reduzida significativamente quando a contaminação salivar ocorreu após a fotopolimerização do adesivo. Conclusão: A contaminação influenciou negativamente a resistência de união do adesivo somente após a sua polimerização; nesta condição os tratamentos realizados não foram eficientes para recuperar a adesão.

Change in shear bond strength of orthodontic brackets using self-etching primer according to adhesive types and saliva contamination / 대한치과교정학회지

The purpose of this study was to evaluate and compare the shear bond strength of orthodontic brackets depending on the variety of adhesives and whether saliva exists, by using self-etching primer (SEP). Groups were divided according to the type of adhesive into resin adhesive (Transbond XT) and resin-modified glass ionomer cement (Fuji Ortho LC). One group of resin adhesive used XT primer after etching with 37% phosphoric acid, and the other group used self-etching primer. One group of resin-modified glass ionomer cement only used etching for bonding, and the other group used SEP. Each of the groups were also classified by whether saliva was contaminated or not, and then the shear bond strength was measured. The results showed that when using resin adhesive, the shear bond strength of SEP was lower than the XT primer. In the resin-modified glass ionomer cement groups, the shear bond strength which depends on the priming method, did not have a meaningful difference statistically. When saliva was contaminated, the group which used SEP, regardless of the adhesive variety, had a greater shear bond strength than the normal priming group. From these results, SEP showed a shear bond strength that is possible to be used clinically, regardless of the adhesive variety. It can especially be clinically useful to use SEP to bond brackets even on tooth surfaces contaminated with saliva, because it offers the appropriate bonding strength as well as shorter treatment time and easy application.

The effects of salivary contamination on tensile bond strength of resin modified glass ionomer cements in bonding brackets / 대한치과교정학회지

The purposes of this study were to evaluate applicability of resin modified glass ionomer cements and to determine the effect of salivary contamination on the tensile bond strength. Fourty extracted human permanent premolars were prepared for bonding and standard edgewise brackets were bonded with Ortho-One, Fuji Ortho LC, Vitremer and Advance. Fourty extracted human permanent premolars were contaminated with saliva, dried and bonded with same materials above. The tensile bond strength was tested by Instron testing device after storage in normal saline at 37degrees C for 24 hours from bonding. The results were as follow : 1. The tensile bond strength of Ortho-one group was 7.68 1.76, Advance group was 7.87 2.80, Fuji Ortho LC group was 4.99 +/-2.53, Vitremer group was 2.80 0.88 MPa. The tensile bond strength in contaminated condition of Ortho-One group was 4.12 1.67, Advance group was 5.37 0.68, Fuji Ortho LC group was 4.41 1.61, Vitremer group was 2.60 1.10 MPa.. 2. Salivary contamination did not affect the tensile bond strength when compared with the uncontaminated enamel group in Fuji Ortho LC and Vitremer (p>0.05) and there was great significant difference in the tensile bond strength of Ortho-One and Advance. 3. Advance, Ortho-One and Fuji Ortho LC seemed to have clinically a proper bond strength.