Effect of different surface-cleaning techniques on the bond strength of composite resin restorations.

STATEMENT OF PROBLEM: Different techniques have been suggested for cleaning dentin surfaces after the removal of an interim prosthesis and before the application of a bonding agent. How different surface-cleaning techniques affect the bond strength of the composite resin restorations is not clear. PURPOSE: The purpose of this study was to investigate the effects of different surface-cleaning techniques on the bond strength of composite resin restorations and the surface topography of the prepared tooth surfaces. MATERIAL AND METHODS: The occlusal surfaces of 25 molars were ground until the dentin was exposed. A bonding agent and interim cement were applied on the teeth. The teeth were divided into 5 groups (n=5) according to the method used for surface-cleaning (microairborne-particle abrasion, alcohol, rubber-rotary instrument, desiccating agent, and control). Once the surfaces of the teeth had been cleaned, the same bonding material was applied to the teeth. A 5-mm-thick composite resin layer was built up. Each specimen was sectioned to microbars, and 6 centrally located beams were selected for microtensile testing (n=30) (1.10 ±0.10 mm). The data were statistically analyzed with 1-way ANOVA (1-sample Kolmogorov-Smirnov test). The Bonferroni test was used for significantly different groups (α=.05). One specimen from each group was observed under a scanning electron microscope and an atomic force microscope. Energy dispersive x-ray analysis also was performed. RESULTS: Bond strength values were in the following descending order: microairborne-particle abrasion, desiccating agent, alcohol, rubber-rotary instrument, control. Differences between the microairborne-particle abrasion group and the remainder of the groups, desiccating agent--rubber-rotary instrument, desiccating agent-control, alcohol--rubber-rotary instrument, and alcohol-control groups, were statistically significant (P<.05). The microairborne-particle abrasion group displayed the roughest surface and a different surface topography from the remainder of the groups. Increased aluminum was observed in the microairborne-particle abrasion group. CONCLUSIONS: Surface-cleaning techniques, except for the rubber-rotary instrument, increased the bond strength of composite resin. The roughest dentin surfaces and highest bond strength were achieved with the microairborne-particle abrasion technique.

Evaluation of the applicability of temporomandibular opening index in Turkish children with and without signs and symptoms of temporomandibular joint disorders.

Limitation of mandibular movement is one of the cardinal signs of temporomandibular disorders. Temporomandibular Opening Index (TOI) is a new technique to determine the restricted mouth opening in temporomandibular joint dysfunction syndrome (TMD). The purpose of this study was to compare the TOI of Turkish children with and without TMD in primary, mixed, and permanent dentitions. In this study, a total of 270 children were evaluated. One hundred thirty-five (135) subjects had no signs or symptoms of TMD (Group 1), while the remaining 135 subjects did have signs and symptoms of TMD (Group 2). Forty-five (45) patients were selected for each dentition for two groups. "Maximum Voluntary Mouth Opening" (MVMO) values and TOI ranges were calculated. A Mann-Whitney U test and a Kruskal Wallis test were used to compare the data (p<0.05). TOI showed statistical differences between all dentitions with and without TMD (p<0.05). There were no significant differences between different dentitions or genders in Group 1 or Group 2 (p<0.05).

Effect of sodium ascorbate on bond strength of different adhesive systems to NaOCl-treated dentin.

The aim of this study was to evaluate the effects of sodium ascorbate on bond strength of different adhesive systems to NaOCl-treated dentin. Eighty extracted molar teeth were used in the study. The buccal enamel surfaces were removed to obtain a flat dentin surface. The teeth were mounted in self-curing resin and dentin surfaces were irrigated with NaOCl for 10 min. Half of the specimens were treated with sodium ascorbate for 10 min. The teeth were randomly assigned to four subgroups according to the adhesive systems used (Clearfil SE Bond, Clearfil Tri-S Bond, Adper Prompt-L-Pop, Adper Single Bond 2). Bond strengths were determined with a Universal Testing Machine, at a crosshead speed of 0.5 mm/min. Data were statistically analysed using anova at a significance level of 0.05. Two-way ANOVA revealed that the effect of sodium ascorbate application on bond strength of adhesive systems to NaOCl-treated dentin was statistically significant (P < 0.05). The bond strength results were significantly influenced by the application of sodium ascorbate (P < 0.05) and there was a significant difference between the adhesive systems (P < 0.05). Although statistically significant differences were not demonstrated in all adhesive resin groups, sodium ascorbate application after NaOCl treatment improved the bond strength values.

Clinical success of deproteinization in hypocalcified amelogenesis imperfecta.

OBJECTIVE: To determine the effect of deproteinization on the success of composite crowns in hypocalcified amelogenesis imperfecta-affected permanent teeth in intraoral conditions. METHOD AND MATERIALS: A total of 32 permanent teeth in 4 healthy children with hypocalcified amelogenesis imperfecta were restored with strip crowns and composite resin. Teeth on the left side of the jaw were selected as the control group, and teeth on the right side of the jaw were selected as the treatment group. In the treatment group, a solution of 5% sodium hypochlorite was applied for 1 minute after acid conditioning of tooth surfaces. Clinical success was determined by USPHS modified Ryge criteria up to 36 months. RESULTS: The deproteinization procedure had no effect on the anatomic form of the restorations. The cervical integrity of the restorations in both groups showed inferior results after 36 months compared to baseline. For both groups, no recurrence of caries was observed. CONCLUSION: The deproteinization had no significant effect on the success of the adhesive restorations; however, composite restorations were clinically successful in children affected by hypocalcified amelogenesis imperfecta in long-term follow-up.

Microleakage of class-v composite restorations with different bonding systems on fluorosed teeth.

OBJECTIVES: To examine the effects of dental fluorosis and total and self-etch bonding systems on microleakage of Class-V composite restorations in permanent molar teeth. METHODS: Teeth were classified as three main groups according to Thylstrup-Fejerskov Index (TFI) as TFI=0, TFI=1-3 and TFI=4. Total and self-etching/bonding procedures were determined for each main group. Total-etching procedures were acid-etching for 30s and acid-etching for 60s with Single Bond/total-etch bonding system. Self-etching procedure was applied with Prompt-L-Pop/self-etch bonding system. 63 box-shaped Class-V cavities (4 x 2 x 2 mm) were prepared on mid-buccal/palatinal/lingual surfaces of teeth for totalling nine test groups (n=7). Restorations with composite material (Charisma) polymerized with halogen unit for 40s. Teeth were thermocycled between +5 degrees C - +55 degrees C (x500), immersed in 0.5% basic-fuchsin solution (37 degrees C, 24h) and separated longitudinally in bucco-lingual direction. Dye penetration was examined under stereomicroscope (3.2 x 10). RESULTS: Microleakage levels were higher in teeth of TFI=4 than TFI=0 occlusally or cervically (P<.05). In TFI=0; total-etched teeth for 30s have statistically shown more leakage than total-etched teeth for 60s occlusally or cervically (P<.05). In TFI=4; microleakage levels were significantly higher for 30s than 60s cervically (P<.05). For all TFI levels, microleakage was commonly increased with self-etch system than total-etch system (P<.05). Generally, higher leakage was present at cervical margins than occlusal margins (P<.05). CONCLUSIONS: Microleakage has increased by severity of dental fluorosis. Generally, more leakage was observed in total-etched teeth for 30s than 60s. Microleakage was commonly higher in self-etched teeth than total-etched teeth. More leakage was present at cervical margins than occlusal margins.

Multiple hereditary osteochondromatosis: a case report.

OBJECTIVES: Common carious lesions owing to vomiting are not widespread in children. In this case, we aimed to report an 11-years-old male patient with common carious lesions due to repeated vomitings, chewing and eating difficulty and retarded growth with Multiple Hereditary Osteochondromatosis (MHO). CASE REPORT: An 11-years-old boy was referred to Department of Pediatric Dentistry in Faculty of Dentistry because of eating difficulty owing to common carious lesions. It was seen that the patient growth was generally retarded in extra-oral examination. Some exostoses were also present on the extremities. It was learned that he was previously diagnosed as MHO in Faculty of Medicine. Nausea and vomiting have been commonly occurring after taking of Didronat. Chewing and eating difficulty and inadequate nutrition were present because of bad oral hygiene, carious lesions and remained roots. Growth was negatively affected by malnutrition and MHO. RESULTS: Diet recommendations were given and oral hygiene behaviors were rearranged. Preventive, surgical, restorative and prosthetical dental applications were applied for dental treatments.