Vol 8, No 4 (2011)
Proceeding Abstracts
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Objective: Biopure® MTAD (Dentsply Tulsa Dental, USA) has been developed
as a final irrigant following root canal shaping to remove intracanal smear layer.
Many of the unique properties of MTAD potentially transfer to the conditioning
process of tooth roots during periodontal therapy. The aim of this ex vivo study
was to evaluate the effect of MTAD on the removal of smear layer from root surfaces.
Materials and Methods: Thirty two longitudinally sectioned specimens from 16
freshly extracted teeth diagnosed with advanced periodontal disease were divided
into four groups. In group 1 and 2, the root surfaces were scaled using Gracey curettes.
In group 3 and 4, 0.5 mm of the root surface was removed using a fissure
bur. The specimens in group 1 and 3 were then irrigated by normal saline. The
specimens in groups 2 and 4 were irrigated with Biopure MTAD.
All specimens were prepared for SEM and scored according to the presence of
smear layer.
Results: MTAD significantly increased (P=0.001) the smear layer removal in
both groups 2 and 4 compared to the associated control groups, in which only saline
was used.
Conclusion: MTAD increased the removal of the smear layer from periodontally
affected root surfaces. Use of MTAD as a periodontal conditioner may be suggested. -
Objective: It has been noted that the presence of Helicobacter pylori (H. pylori)
in the oral cavity may affect the outcome of eradication therapy. This condition is
associated with the recurrence of gastric infection. The optimum secretion of saliva
promotes oral health consequently influencing H. pylori eradication. The purpose
of this study was to investigate the relation between salivary secretion and
the efficacy of H. pylori eradication from the stomach.
Materials and Methods: Forty five patients with gastric H. pylori infection were
enrolled in this study. Diagnosis of H. pylori infection was confirmed by endoscopy,
biopsy, urease test and histological examination. Salivary secretion of all
participants was determined under standard condition before the beginning of antibacterial
treatment. Then the patients were treated with a 14-day course anti-H.
pylori regimen consisting of amoxicillin, omeprazole, metronidazole and bismuth.
The efficacy of eradication therapy was evaluated 4 weeks after the end of the
treatment course. Mann-Whitney U test was used to analyze the variables.
Results: The median of salivary secretion among successful and unsuccessful H.
pylori eradication groups was 0.48 ml/min and 0.24 ml/min, respectively
(p=0.005).
Conclusion: Although the type of drug regimens is challenging, the efficacy of
H. pylori eradication from the stomach might be reduced by lower salivary secretion. -
Objective: Excessive weight in children is a major public health concern. The intake
of refined carbohydrates, especially sugars and the prevalence of dental caries
are well documented in the literature. The purpose of this study was to investigate
the relationship between dental caries and BMI in elementary school children.
Materials and Methods: The sampling technique used in the present study was a
cluster random sampling. A total of 1000 pupils (500 girls, 500 boys) aged 6-11
years from 20 private and state elementary schools (10 boys, 10 girls). The weight
status was measured in children by assessment of body mass index (BMI) (=body
weight/body height2 kg/m2) corresponding to gender and age-ranked percentages.
To assess the caries frequency the decayed filled teeth (DFT) index for permanent
dentition and the dft index for primary dentition were used since they give good
perception about the situation of tooth caries in young patients.
Results: The highest mean total dft/DFT was seen in normal weight and lowest
average in at risk of overweight children. There was not a statistically significant
relationship found between high weight and caries frequency in the first (p=0.08)
and permanent dentitions (p=0.06).
Conclusion: The results of this preliminary study do not support an association
between dental caries and obesity. -
Objective: Zinc oxide eugenol (ZOE) under composite restorations should be
covered with a suitable material in order to prevent the harmful effect of ZOE on
the composite. The aim of this in vitro study was to evaluate microleakage of
composite restorations in pulpotomized primary molars with different bases for
covering the ZOE layer and to assess the distance between different layers.
Materials and Methods: Proximo-occlusal cavities were prepared in 78 extracted
second primary molars. Carious lesions were removed and pulpotomy was
carried out. Zinc oxide eugenol paste was placed in 2-mm thickness. The teeth
were randomly divided in 6 groups and restored as follows: 1. Light-cured composite;
2. Resin-modified glass-ionomer and composite resin; 3. Glass-ionomer
and composite resin; 4. Light-cured calcium hydroxide and composite resin; 5.
Calcium hydroxide and composite resin; 6. Amalgam and composite resin. The
restored specimens were thermocycled for 500 cycles (5°C/55°C) and microleakage
was assessed by dye penetration technique. Three specimens from each
group were processed for scanning electron microscope evaluation to determine
the distance between the layers. The results were analyzed by Kruskal-Wallis and
Dunn tests.
Results: Microleakage assessment revealed significant differences between the
groups (P=0.04), with the amalgam group exhibiting the lowest microleakage
values. In SEM micrographs no significant differences were observed in the distance
between ZOE base layers (P=0.94) and base-composite layers (P=0.47);
however, the amalgam group had the lowest distances.
Conclusion: The use of amalgam over zinc oxide eugenol layer in pulpotomized
primary molars decreases microleakage. -
Objective: To determine the pattern of stability changes as a reflection of early
healing around single-stage roughened-surface implants in humans utilizing resonance
frequency analysis (RFA).
Materials and Methods: Hundred twenty-five patients who demanded dental
implants were treated with two different implant (Nobel Biocare ReplaceTM and
StrummanTM ITI) systems. Bone type was classified into four groups. RFA was
used for direct measurement of implant stability on the day of implant placement
and consecutively at 14, 30 and 60 days after placement. The data were analyzed
with Student t test and regression analysis.
Results: Three-hundred four roughened surface implants placed in the maxilla
and mandible were evaluated. In ReplaceTM implants the lowest mean stability
measurement was at 30 days for all bone types and the stability did not change
significantly in any of the bone types (p>0.05). ITITM implants demonstrated the
lowest stability at 60 days for type 1 and 30 days and baseline for type 2, 3 and 4
bones. In addition, there was significant differences in implant stability between
bone types 1 and 4 (P<0.001), 2 and 3 (p<0.05) , and bone types 3 and 4
(P=0.07) at all aforementioned times in ITITM implants. In ReplaceTM implants,
regarding the implant diameter, contrary to ITI implants, no significant stability
changes were detected (p>0.05). No significant difference was observed regarding
gender, age and lengths in both systems.
Conclusion: In comparison to ITITM implants, ReplaceTM implants revealed no
significant difference in the pattern of stability changes among different bone
types. -
Objective: The objective of this study was to compare the tensile bond strength
of metal brackets bonding to glazed ceramic surfaces using three various surface
treatments.
Materials and Methods: Forty two glazed ceramic disks were assigned to three
groups. In the first and second groups the specimens were etched with 9.5% hydrofluoric
acid (HFA). Subsequently in first group, ceramic primer and adhesive
were applied, but in second group a bonding agent alone was used. In third group,
specimens were treated with 35% phosphoric acid followed by ceramic primer
and adhesive application. Brackets were bonded with light cure composites. The
specimens were stored in distilled water in the room temperature for 24 hours and
thermocycled 500 times between 5°C and 55°C. The universal testing machine
was used to test the tensile bond strength and the adhesive remenant index scores
between three groups was evaluated. The data were subjected to one-way
ANOVA, Tukey and Kruskal-Wallis tests respectively.
Results: The tensile bond strength was 3.69±0.52 MPa forfirst group, 2.69±0.91
MPa for second group and 3.60±0.41 MPa for third group. Group II specimens
showed tensile strength values significantly different from other groups (P<0.01).
Conclusion: In spite of limitations in laboratory studies it may be concluded that
in application of Scotch bond multipurpose plus adhesive, phosphoric acid can be
used instead of HFA for bonding brackets to the glazed ceramic restorations with
enough tensile bond strength. -
It is difficult to reconstruct an alar defect with cartilage involvement. Here in the
authors report a case of traumatic alar loss during childhood in which an alar reconstruction
was carried out with a composite auricular graft put over the pedicle
buccal flap which was rotated and passed through the intraoral side. The lining
skin and auricular cartilage for the flap was obtained from the auricular region
which was acceptable for the patient. All procedures were performed under general
anesthesia. One year follow up revealed satisfactory results with minimal
contracture of the graft. -
Radicular cysts arising from deciduous teeth are rare. This report presents
a case of radicular cyst associated with a primary molar following pulp
therapy and discusses the relationship between pulp therapy and the rapid
growth of the cyst. The treatment consisted of enucleation of the cyst sac
and extraction of the involved primary teeth and 20 months follow up of
the patient. Early diagnosis of the lesion would have lead to a less aggressive
treatment plan.
