Effects of desensitizer and laser desensitization on surface morphology, hardness and composition of dentin / 吉林大学学报(医学版)

Objective: To investigate the effects of Aominqing desensitizer and two laser (Er: YAG and Nd: YAG) treatments on the dentin surface morphology, hardness, and calcium (Ca) and phosphorus (P) contents and Ca/P ratio, to clarify the possible mechanisms, and to provide reference for its clinical application in the treatment of dentin sensitivity. Methods: The fresh third molars extracted because of impaction from the volunaeers aged 18-20 years old were collected. A total of 32 dentin slices of 2 mm were prepared; the samples were divided into blank control group, Aominqing group Er: YAG group and Nd: YAG group, and there were eight samples in each group. Except blank control group, the samples in other groups were used to establish the dentin hypersensitivity models by purifying the polluted layer with 17% EDTA. Each sample was cut by linear cutting machine from the middle symmetry into two semicircle dentin; the half was used to detect the dentin surface microhardness (SMH) values by microhardness meter, another half was used to observe the surface morphology and analyze the Ca and P contents with SEM and EDS was observed. Results: There were no significant differences in the SMH values of dentin samples between various groups (P>0.05). In blank control group, there was no smear layer on the dentin surface with wide tubules and smooth and clean surface; the dentin tubules of the samples in Aominqing group were partially closed, and obstructions were seen in the tubuless in Er: YAG group the dentin tubules were little or no open, most of them were partially or completely closed tubules, the surface had the melting changes in Nd: YAG group, the dentin tubules were partially or completely closed with few open tubules and the surface was molten. Compared with blank control group and Aominging group, the Ca and P contents in the samples in Er: YAG group and Nd: YAG were significantly increased; there was no statistically significant difference in the contents of Ca and P between and blank control group and Aclinsing group (P>0.05), and the difference between Er: YAG group and Nd: YAG group was not significant (P>0.05). The differences in the Ca/P ratios between various groups were not statistically significant (P>0.05). Conclusion: The application of Aominqing desensitization agent, Er: YAG laser and Nd: YAG laser can not cause the changes of dentin SMH and the Ca/P ratio, but the application of Er: YAG and Nd: YAG laser to dentin can significantly increase the contents of Ca and P and change the morphology, composition and structure of dentin surface.

Comparing the effect of a desensitizing material and a self-etch adhesive on dentin sensitivity after periodontal surgery: a randomized clinical trial

OBJECTIVES: This double-blind randomized placebo-controlled clinical trial evaluated the ability of a desensitizing agent and a self-etch adhesive on cervical dentin sensitivity (CDS) after periodontal surgery. MATERIALS AND METHODS: Ninety hypersensitive teeth of 13 subjects were included in the study. After periodontal surgery, the teeth of each posterior sextant treated with one of the following materials: G1: Clearfil S³ Bond (Kuraray Dental), G2: Gluma Desensitizer (Heraeus Kulzer), and G3: placebo (water). The sensitivity was assessed using evaporative stimuli before treatment (baseline, T0), 1 day after treatment (T1), after 1 week (T2), and after 1 month (T3) according to visual analog scale (VAS). RESULTS: Following the treatment, all the 3 groups showed significant reduction of CDS in T1 compared to T0. Reduction of CDS between T1 and T2 was observed only in G1 but there was no significant difference between T2 and T3 in this group. Although we observed a significant difference in T3 compared to T1 and T2 in G2 and G3, comparison of treatment groups in each assessment time showed a significant difference only in T3. According to paired comparison, this was due to the difference between G2 and G3. CONCLUSIONS: Dentin sensitivity following periodontal surgery will decrease spontaneously over time, but treating the sensitive teeth with Gluma Desensitizer and Clearfil S³ Bond can have some benefits.

Effect of GLUMA desensitizer on the retention of full metal crowns cemented with Rely X U200 self-adhesive cement

PURPOSE: Considering the importance of retention in the success and long-term clinical service of fixed partial dentures (FPDs) as well as the existing controversy regarding the effect of GLUMA desensitizer on the retention of full metal crowns cemented with RelyX U200 self-adhesive cement, this study aimed to assess the effect of GLUMA desensitizer on the retention of full metal crowns cemented using RelyX U200. MATERIALS AND METHODS: In this experimental study, 20 sound human premolars were prepared; a 0.5 mm chamfer finish line was prepared above the cementoenamel junction. The teeth were randomly assigned to two groups: a desensitizer group (n = 10, treated with GLUMA desensitizer) and a control (n = 10, no surface treatment). Full metal crowns were fabricated of base metal alloy and had a ring. All crowns were cemented with RelyX U200 and subjected to retention test by using a universal testing machine. The data were analyzed using SPSS version 20 and independent t-test. RESULTS: The mean tensile bond strength was significantly higher in the GLUMA desensitizer group (230.63 ± 63.8 N) compared to the control group (164.45 ± 39.3 N) (P≤.012). CONCLUSION: GLUMA desensitizer increases the tensile bond strength of RelyX U200 self-adhesive cement to dentin.

Evaluation of three different agents for in‑office treatment of dentinal hypersensitivity: A controlled clinical study.

Context: Dentin desensitizers are used for in‑office treatment of dentinal hypersensitivity. They block the open tubules and bring about a reduction in hypersensitivity. Aim: The aim was to evaluate and compare the clinical effectiveness of a dentin desensitizer, a combination of a dentin desensitizer + adhesive and one‑bottle self‑etching adhesive for in‑office treatment of dentin hypersensitivity. Settings and Design: Institutional, prospective double-blind parallel clinical design. Subjects and Methods: A total of 54 teeth in 20 patients were randomly allocated to one of the three study groups, with 18 teeth in each group as follows: Group A‑Gluma Desensitizer (GD), Group B‑Gluma Comfort Bond + Desensitizer (GCBD), Group C‑Single Bond Universal (SBU). The patients’ dentinal hypersensitivity scores for tactile (hand‑held scratch device), thermal (cold), and evaporative (dental unit air syringe) stimuli were recorded on a visual analog scale. The parameters were recorded at baseline, immediately after application of the agent, 3‑ and 6‑week posttreatment. Statistical Analysis Used: The data were analyzed with Friedman’s test, Wilcoxon signed ranks test, Kruskal–Wallis test, and Mann–Whitney‑U‑test (P < 0.05). Results: All three groups showed a significant reduction in dentinal hypersensitivity (P < 0.05) compared to baseline at all time intervals. Statistically, significant differences were noted between GD and SBU; between GCBD and SBU in all testing parameters. Between GD and GCBD no significant difference was noted. Conclusions: GD and GCBD showed a greater reduction in dentin hypersensitivity than SBU.

The clinical effect of Desensitizer Oravive combined with Er:YAG laser irradiation on dentin hypersensi-tivity / 实用口腔医学杂志

Objective:To observe the clinical effect of Desensitizer Oravive combined Er:YAG laser irradiation on dentin hypersen-sitivity.Methods:240 molars in 86 patients with dentin hypersensitivity were divided into 2 groups(n =1 20).In control group De-sensitizer Oravive was applied to the teeth surface for 30 s;in combination group the teeth surfaces were treated by Er:YAG laser irra-diation for 60 s,and then by Desensitizer oravive for 30 s.Each tooth was treated only once.Pain and pain relief were evaluated by VAS before treatment and immediately,4,8 and 1 2 weeks after treatment.Data were statistically analyzed.Results:Before treat-ment,VAS showed no significant difference between the groups(P >0.05).Both groups exhibited lower VAS after treatment(P <0. 05),VAS values were lower(P <0.05)and the effective rate was higher in the combination group than those in the control group at each treatment stage(P <0.05).Conclusion:Desensitizer Oravive combined with Er:YAG laser is more effective than Desensitizer Oravive in the treatment of dentin hypersensitivity.

The effect of 3 MP90 bonding system in dentin tubule sealing / 实用口腔医学杂志

Dentin blocks were prepared from 36 freshly extracted teeth and randomly divided into 3 groups(n=1 2).The block surfaces were cleaned and then treated with 3 MP90 bonding system,Gluma desensitizer and distilled water respectively.Scanning electron microsco-py observation showed that the dentin tubule sealing rate of 3 MP90 bonding system,Gluma desensitizer and distilled water was 1 00%, 76.48% and 0(P<0.05)respectively.

The effectiveness of Minqing Ao dental desensitizer in the treatment of early childhood caries / 实用口腔医学杂志

Objective:To evaluate the effectiveness of Minqing Ao dental desensitizer in the treatment of early childhood caries (ECC).Methods:41 0 teeth with ECC in 1 1 0 cases were divided into 3 groups.Minqing Ao dental desensitizer,fluoride toothpaste and ordinary toothpaste without fluoride were respectively used in group A,B and C.The laser fluorescence value(LFV)was meas-ured and compared before treatment,2,4,6 weeks and 6 months after treatment.Results:2 weeks after treatment,the LFV was not significantly changed in the 3 groups.4 weeks after treatment LFV in group A was decreased(P0.05).6 weeks after treatment LFV in group A and B was decreased(P<0.01 and P<0.05),there was significant difference be-tween each 2 groups(P<0.05).6 weeks and 6 months after treatment LFV in group A was lower than that in group B(P<0.01 ),and in group B was lower than that in group C(P<0.01 ).Conclusion:Minqing Ao is effective for treatment of early childhood caries.

The effect of a desensitizer and CO2 laser irradiation on bond performance between eroded dentin and resin composite

PURPOSE: This study was aimed to evaluate effect of the desensitizing pretreatments on the micro-tensile bond strengths (microTBS) to eroded dentin and sound dentin. MATERIALS AND METHODS: Forty-two extracted molars were prepared to form a flat dentin surface, and then they were divided into two groups. Group I was stored in distilled water while group II was subjected to a pH cycling. Each group was then subdivided into three subgroups according to desensitizing pretreatment used: a) pretreatment with desensitizer (Gluma); b) pretreatment with CO2 Laser (Ultra Dream Pluse); c) without any pretreatment. All prepared surfaces were bonded with Single Bond 2 and built up with resin composite (Filtek Z250). The micro-tensile bond test was performed. Fracture modes were evaluated by stereomicroscopy. Pretreated surfaces and bonded interfaces were characterized by scanning electron microscope (SEM). The data obtained was analyzed by two-way ANOVA (alpha=0.05). RESULTS: For both sound and eroded dentin, samples treated with desensitizer showed the greatest microTBS, followed by samples without any treatment. And samples treated with CO2 laser showed the lowest microTBS. SEM study indicated that teeth with eroded dentin appeared prone to debonding, as demonstrated by existence of large gaps between adhesive layers and dentin. CONCLUSION: Pretreatment with Gluma increased the microTBS of Single Bond 2 for eroded and sound teeth. CO2 laser irradiation weakened bond performance for sound teeth but had no effect on eroded teeth.

The effect of dentin desensitizers and Nd:YAG laser pre-treatment on microtensile bond strength of self-adhesive resin cement to dentin

PURPOSE: The purpose of this study is to evaluate if pre-treatment with desensitizers have a negative effect on microtensile bond strength before cementing a restoration using recently introduced self-adhesive resin cement to dentin. MATERIALS AND METHODS: Thirty-five human molars' occlusal surfaces were ground to expose dentin; and were randomly grouped as (n=5); 1) Gluma-(Glutaraldehyde/HEMA) 2) Aqua-Prep F-(Fluoride), 3) Bisblock-(Oxalate), 4) Cervitec Plus-(Clorhexidine), 5) Smart protect-(Triclosan), 6) Nd:YAG laser, 7) No treatment (control). After applying the selected agent, RelyX U200 self-adhesive resin cement was used to bond composite resin blocks to dentin. All groups were subjected to thermocycling for 1000 cycles between 5-55degrees C. Each bonded specimen was sectioned to microbars (6 mm x 1 mm x 1 mm) (n=20). Specimens were submitted to microtensile bond strength test at a crosshead speed of 0.5 mm/min. Kolmogorov-Smirnov, Levene's test, Kruskal-Wallis One-way Analysis of Variance, and Conover's nonparametric statistical analysis were used (P.05). The microtensile bond strengths of Aqua-Prep F, and Cervitec Plus were similar to each other but significantly lower than the control group (P<.05). Bisblock showed the lowest microtensile bond strength among all groups (P<.001). Most groups showed adhesive failure. CONCLUSION: Within the limitation of this study, it is not recommended to use Aqua-prep F, Cervitec Plus and Bisblock on dentin when used with a self-adhesive resin cement due to the decrease they cause in bond strength. Beside, pre-treatment of dentin with Gluma, Smart protect, and Nd:YAG laser do not have a negative effect.

The effects of desensitizing agents, bonding resin and tooth brushing on dentin permeability, in vitro / 대한치과보철학회지

PURPOSE: The effects of desensitizing agent are often for a short duration. One of the reasons is believed to be wear of desensitizing agent by tooth brushing. To reduce the wear and make the duration longer, dental bonding resin was applied and the changes of dentin permeability after toothbrushing were measured. MATERIALS AND METHODS: Extracted teeth free from caries were chosen. Coronal dentin discs with thickness of 1 mm were prepared. Using the split chamber device developed by Pashely, hydraulic conductance and scanning electron microscope images (SEM) were compared and contrasted before and immediately after the application of desensitizing agent and bonding resin and then after equivalent tooth brushing of 1 week, 2 weeks, and 6 weeks. Four commercially available desensitizing agents were used in this study; they were All-Bond 2, Seal & Protect, Gluma, and MS Coat. And Dentin/Enamel Bonding resin (Bisco Inc.) was used. The results of this study are as follows. RESULTS: On all specimens, the hydraulic conductance decreased after the application of tooth desensitizing agent and bonding resin. Compared with the specimens treated only with desensitizer, the specimens treated with All-Bond 2, Gluma, MS Coat and plus D/E bonding resin had a little increase in hydraulic conductance after 1, 2 and 6-week tooth brushing. In case of Seal & Protect, the specimens showed the same result only after 6-week tooth brushing. On examination of SEM, the dentinal tubule diameter had decreased after treatment of desensitizing agents and bonding resin. And the specimens treated with All-Bond2, Seal&Protect, Gluma, MS Coat and plus D/E bonding resin had an significant decrease in diameter of dentinal tubule after 6-week tooth brushing. CONCLUSION: According to the results of this study, it is effective to use bonding resin after application of desensitizer in reducing the wear by tooth brushing and making the duration longer. In this study, just 6-week tooth brushing was performed, and it is not enough to regard it as a long-term data. So further study is needed and more perfect method for treating dentin hypersensitivity should be developed.

Effect of desensitizer application on shear bond strength of composite resin to bleached enamel.

Objective: Tooth sensitivity is common after vital tooth bleaching. The aim of this study is to evaluate the effect of a desensitizing agent on shear bond strength of composite resin to bleached enamel; and determine whether a delay of one or two weeks in bonding procedure is sufficient subsequent to bleaching/desensitizer regimen. Materials and Methods: Buccal enamel surfaces of ninety-six human sound molars were prepared and divided into eight groups. The surfaces of specimens in Group 1 as negative control group were bonded by composite resin using the single bond adhesive. Specimens in Groups 2-4 were bleached with an at-home bleaching agent (Daywhite ACP). Relief ACP desensitizing gel alone was applied in Group 5. In Groups 6-8, specimens were bleached same as in Group 2 and relief ACP desensitizing gel was applied same as inGroup 5 subsequent to each bleaching session. Composite cylinders were bonded after 24 h, 7 days and 14 days in Groups 2-4, respectively, and also in Groups 6-8, respectively. The shear bond strengths of the cylinders were tested and data was analyzed using two-way ANOVA and Tukey test (α = 0.05). Results: The results showed that bleaching and bleaching/desensitizer regimens significantly reduced the bond strength of composite resin to enamel. However, desensitizer alone did not reduce bond strength. No statistically significant differences were found between bleaching and bleaching/desensitizer regarding bond strength. Conclusion: Bleaching or bleaching/desensitizer treatment significantly decreases bond strength of composite resin to enamel. In both regimens, adhesive bonding is recommended after two weeks.

Comparative evaluation of NovaMin desensitizer and Gluma desensitizer on dentinal tubule occlusion: a scanning electron microscopic study

PURPOSE: In this study, the effect of calcium sodium phosphosilicate (NovaMin) desensitizing agent, which is a powder-based system, and hydroxyethyl methacrylate and glutaraldehyde (Gluma desensitizer), which is liquid-based system, on dentinal tubule occlusion was analyzed by scanning electron microscope. The effects of the above two along with one control group were compared to determine the more effective method of sealing the dentinal tubules after initial application. METHODS: Twenty specimens were allocated to each of 3 groups: Control, Gluma desensitizer, and NovaMin. Two additional samples were also prepared and treated with Gluma and NovaMin; these samples were longitudinally fractured. The specimens were prepared from extracted sound human premolars and were stored in 10% formalin at room temperature. The teeth were cleaned of gross debris and then sectioned to provide one to two dentin specimens. The dentin specimens were etched with 6% citric acid for 2 minutes and rinsed in distilled water. Control discs were dried, and the test discs were treated with the desensitizing agents as per the manufacturer's instructions. The discs as well as longitudinal sections were later analyzed under the scanning electron microscope. The proportions of completely occluded, partially occluded, and open tubules within each group were calculated. The ratios of completely and partially occluded tubules to the total tubules for all the groups was determined, and the data was statistically analyzed using nonparametric tests and statistical significance was calculated. RESULTS: NovaMin showed more completely occluded tubules (0.545+/-0.051) while Gluma desensitizer showed more partially occluded tubules (0.532+/-0.075). The differences among all the groups were statistically significant (P< or = 0.05). CONCLUSION: Both materials were effective in occluding dentinal tubules but NovaMin appeared more promising in occluding tubules completely after initial application.

Effect of two different dentin desensitizers on shear bond strength of two different bonding agents to dentin: An in vitro study.

Objective: The objective of the study was to compare the effect of two different desensitizers on shear bond strength of two different fifth-generation single-bottle adhesive agents on dentin surface. Materials and methods: Sixty human premolars were taken and divided into six groups of 10 samples each. The first two groups were the control groups and were not pretreated with any desensitizer; the remaining four groups were the experimental groups and were pretreated with either Denshield™ or Sensodent-K™ desensitizer. The specimens in each group were subjected to acid etching, application of adhesive (Single Bond or Prime and Bond NT), and application of hybrid composite resin (Z-100) according to the standard protocol. The specimens were subjected to shear bond strength testing, using a Lloyds universal testing machine (EZ20), followed by stereomicroscopic evaluation of the fracture mode at the debonded interface. Results: Statistically significant difference existed between the two bonding agents in the control groups (group 1 and 2), with Prime and Bond NT showing higher bond strength than Single Bond. No statistically significant difference existed between either control or pretreated with any desensitizer when either of the adhesive systems was used. Prime and Bond NT showed statistically higher bond strength value when teeth were pretreated with Sensodent-K™ (groups 5 and 6). No statistically significant difference in bond strength values were observed between the bonding agents when pretreated with Denshield™ desensitizer.

In vitro dentin permeability after application of Gluma® desensitizer as aqueous solution or aqueous fumed silica dispersion

OBJECTIVES: To assess and to compare the effects of Gluma® Desensitizer (GDL) with an experimental glutaraldehyde and HEMA containing fumed silica dispersion (GDG) on dentin permeability using a chemiluminous tracer penetration test. MATERIAL AND METHODS: Twenty disc-shaped dentin specimens were dissected from extracted human third molars. The dentin specimens were mounted in a split chamber device for determination of permeability under liquid pressure using a photochemical method. Ten specimens were randomly selected and allocated to the evaluation groups Gluma® Desensitizer as aqueous solution and glutaraldehyde/HEMA as fumed silica dispersion, respectively. Dentin disc permeability was determined at two pressure levels after removal of smear with EDTA, after albumin soaking, and after application of the desensitizing agents. Two desensitizer-treated and rinsed specimens of each group were examined by scanning electron microscopy (SEM) for surface remnants. RESULTS: Comparatively large standard deviations of the mean EDTA reference and albumin soaked samples permeability values refected the differences of the dentin substrates. The mean chemiluminescence values of specimen treated with GDL and GDG, respectively, were signifcantly reduced after topical application of the desensitizing agents on albumin-soaked dentin. The effects of GDL and GDG on permeability were not signifcantly different. Treated specimens showed no surface remnants after rinsing. CONCLUSIONS: The experimental desensitizer gel formulation reduced dentin permeability as effectively as the original Gluma® Desensitizer solution.

Effect of a desensitizer on dentinal bond strength in cementation of composite resin inlay / 대한치과보존학회지

The purpose of this study was to evaluate the effect of a desensitizer on dentinal bond strength in cementation of composite resin inlay. Fifty four molar teeth were exposed the occlusal dentin. Class I inlay cavities were prepared and randomly divided into six groups. Control group ; no agent, Group 1 ; Isodan, Group 2 ; One-step, Group 3 ; All-Bond SE, Group 4 ; Isodan + One-step, Group 5 ; Isodan + All-Bond SE. Desensitizing agent and dentin bonding agents were applied immediately after the completion of the preparations. Impressions were then made. The composite resin inlays (Tescera, Bisco) were fabricated according to the manufacturers' guidelines. Cementation procedures followed a standard protocol by using resin cement (Bis-Cem, Bisco). Specimens were stored in distilled water at 37degrees C for 24 hours. All specimens were sectioned to obtained sticks with 1.0 x 1.0 mm2 cross sectional area. The microtensile bond strength (microTBS) was tested at crosshead speed of 1 mm/min. The data was analyzed using oneway ANOVA and Tukey's test. Scanning electron microscopy analysis was made to examine the details of the bonding interface. 1. Group 1 showed significantly lower microTBS than other groups (p<0.05). 2. There was no significant difference between the microTBS of Group 3 and Group 5. 3. The microTBS of Group 4 showed significantly lower than that of Group 2 (p<0.05). In conclusion, a desensitizer (Isodan) might have an adverse effect on the bond strength of composite resin inlay to dentin.

The influence of dentin desensitizer to shear bond strength of dental cements / 대한치과보철학회지

STATEMENT OF PROBLEM: A tenderness of the dentin after tapering of teeth for dental prosthesis is a common phenomenon. In practice, the alternative desensitizer may be used for minor pain after tapering of teeth. PURPOSE: In this study, the desensitizers were used to investigate the affect decreasing of shear bond strength according to the use of various cement, such as resin, Glass Ionomer, and phosphate cement. MATERIAL AND METHOD: Three different desensitizers were used on this study. Compositions of two dentin desensitizers were HEMA(hydroxyethylmethacrylate) and glutaraldehyde. The other one is oxalic acid. Three dentin desensitizers applied on 12 degrees taper teeth. Then, Ni-Cr crowns were bonded with Resin cement, Zinc Phosphate (ZPC) cement and Glass Ionomer (GIC) cement. 120 human premolar teeth were used for specimens. The specimens were divided into four group as the reference and the empirical each with thirty specimens, then further divided into 12 group according to type of desensitizers and cement types. The shear bond strength were measured by Instron multi task instrument. RESULTS: According to the result, the measured shear bond strength in order from the weakest to the strongest in general was ZPC, Resin, and GIC. And it is found that the application of desensitizers on dentin surface does not affect the shear bond strength. CONCLUSION: Dentin desensitizers that alleviate or prevent a dentin tenderness, usually contains HEMA and glutaraldehyde compounds. Such desensitizers are widely used in clinical studies. By applying the dentin desensitizer on the exposed dentin surface, the dentin capillary are blocked and periodontal membrane and cementum can not be drawn in pulp cavity. Since HEMA and glutaraldehyde may cause harm to the pulp cavity, an alternative desensitizer was developed.

Curative Effect of Herbal Desensitizer in the Treatment of Dentine Hypersensitivity / 中国药房

OBJECTIVE:To observe the clinical efficacy of herbal desensitizer in the treatment of dentine hypersensitivity. METHODS: 126 patients with dentine hypersensitivity were enrolled: 64(a total of 172 diseased teeth) were randomly assigned to trial group to be treated with herbal desensitizer,and 62(158 diseased teeth) to control group to be treated with sodium fluoride glycerin. The clinical effects observation was scheduled immediately,3 and 6 months after the treatment. Then the results were analyzed using statistics software.RESULTS: Significant differences were found between the trial group and the control group in clinical effects (P

Effect of rewetting agent on dentinal microtensile bond strength / 대한치과보존학회지

This study investigated that the effect of rewetting agent on dentinal microtensile bond strength (microTBS). Human molars were sectioned to expose the superficial dentin surfaces. Samples were divided into two groups according to type of adhesives-Single Bond (S) and One-Step (O)], and again subdivided into five groups by different dentin surface treatment-dry for 15s (D), blot dry (BD) or dry for 15s, and rewet with different rewetting agents [distilled water (DW), Gluma Desensitizer (GD) and Aqua-Prep (AP)] for 30s. After application of adhesive, composite resin was built up on the bonding surface. Each tooth was sectioned to obtain stick with 1 mm2 cross sectional area and the microTBS was determined by EZ test. In the S group, the mean microTBS of GD, AP and BD group was significantly higher than that of DW and D group (p < 0.05). In the O group, the mean microTBS of AP, GD, BD and DW group was significantly higher than that of D group (p < 0.05). The data suggested that Gluma Desensitizer and Aqua-Prep could be successfully used as rewetting agents, and Distilled water could be acceptable in aceton based adhesive system only.

Effect of a desensitizer on microtensile bond strength of different adhesives / 대한치과보존학회지

This study evaluated the influence of a desensitizer(MS coat) on microtensile bond strength of different adhesives: a three-step adhesive(All-Bond 2), a two-step adhesive(Single Bond), a one-step adhesive(One-up Bond F). Non-caries extracted human molars were used. Dentin surface was obtained by horizontal section on midportion of crown using a water-cooled low speed diamond saw. Teeth were randomly divided into 6 group. AMO(MS coat + All Bond)-, SMO(MS coat + Single Bond)- and OMO(MS coat + One-up Bond F)-dentin surface were treated with 17% EDTA before bonded adhesive. AMX-, SMX- and OMX-dentin surface were bonded with All-Bond 2, Single Bond and One-up Bond F, respectively, with no previous treatment with MS coat and 17% EDTA. About 1cm high resin composite(Z-250(TM)) were incrementally build-up on the treated surface. The specimens for the microtensile test were serially sectioned perpendicular to the adhesive layer to obtain 0.7x0.7 mm sticks. 30 sticks were prepared from each group. After that, tensile bond strength for each stick was measured with Microtensile Tester at a 1mm/min crosshead speed. Fractured dentin surfaces were observed under the SEM. The results were statistically analysed by using a One-way ANOVA and Tukey's test(p<0.05). Value in MPa were: AMO-44.35+/-13.21; SMO-39.35+/-13.32; OMO-31.07+/-10.25; AMX-49.22+/-16.38; SMX-56.02+/-13.35; OMX-72.93+/-16.19. Application of MS coat reduced microtensile bond strengths of both Single Bond and One-up Bond F, whereas microtensile bond strengths of All-Bond 2 were not affected significantly.

The Effect Of Temporary Cement And Desensitizer On The Bond Strength Of Luting Cements / 대한치과보철학회지

This study investigated the effect of temporary cement and desensitizer on the bond strength of luting cements. Total 96 dentin specimens were divided into two groups with and without temporary cementation. For temporary cement-treated group, specimens were cemented with Temp-bond(R) and all specimens were stored in distilled water at 37 celsius degrees for 7 days. Each group was further divided into 3 subgroups with Gluma(R), One-step(R) application and without desensitizer. After desensitizer application, Ni-Cr specimens were luted to dentin surface with Panavia-F(R) and Vitremer(R). Specimens were placed in distilled water at 37 celsius degrees for 24 hours and shear bond strength between metal and dentin was measured by a universal testing machine. The results were as follows: 1. In Panavia-F(R) cemented groups, the combination of One-step(R) without temporary cement showed the greatest strength. Among the desensitizer types, One-step(R) showed the highest bond strength, followed by No-desensitizer, Gluma(R). 2. In Vitremer(R) cemented groups, the combination of no temporary cement and without desensitizer showed the greatest bond strength. Among the desensitizer types, No-desensitizer group showed the highest bond strength. 3. The use of Gluma(R) significantly reduced the shear bond strength in Panavia-F(R) and Vitremer(R) groups. 4. All temporary cement-treated groups showed a significant lower shear bond strength than without temporary cement groups. 5. Desensitizer application significantly influenced the bond strength of the resin cement and resin modified glass ionomer cement.