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At least 685 records · Page 38Linked to original sources
PubMed2005

Clinical effectiveness of two agents on the treatment of tooth cervical hypersensitivity.

PURPOSE: To investigate the desensitizing ability of a one-bottle bonding agent and a glutaraldehyde-based HEMA formulation on sensitive tooth cervical areas for a period up to 9 months. METHODS: The sample consisted of 40 patients with cervical hypersensitivity. Three sensitive teeth per patient were treated; one received One-Step (one-bottle bonding agent), the other Gluma Desensitizer (glutaraldehyde-based agent) and the third distilled water (control group). The hypersensitivity level was determined before, immediately after the desensitizing session, at 8 weeks, and 9 months post-treatment. Measurements of sensitivity were determined by the patient's response to tactile and air-blast stimuli. A verbal rating scale was used and scored as follows: 0, no discomfort; 1, discomfort but no severe pain; 2, severe pain during simulation; 3, severe pain after simulation. The results were subjected to statistical analysis by Kruskal-Wallis test (a=0.05). RESULTS: Both treatment procedures resulted in reduction of hypersensitivity to both stimuli, for up to 9 months. No significant differences were recorded between One-Step and Gluma Desensitizer at immediate and 8-week examinations, whereas Gluma Desensitizer produced lower hypersensitivity than One-Step at the 9-month assessment. In general, a lower level of reduction was found for the 9-month interval compared to the 8-week hypersensitivity score for both agents tested. A placebo effect was observed with water treatment, ranging from 4.7 to 27.5% reduction of hypersensitivity.

Adult↗
PubMedDate not supplied

Occlusal loading evaluation in the cervical integrity of Class II cavities filled with composite.

There are many doubts about the clinical behavior of condensable composite restorations in Class II cavities, particularly when they are submitted to axial mechanical loads. This study evaluated cervical microleakage in Class II direct fillings in composite, whether or not they were submitted to an occlusal load cycling. Twenty-three human molars with standardized cavities (proximal vertical "slot") were treated with enamel and cement endings. After completion of the filling process with condensable composite (Surefil), they were separated into two groups: control (without occlusal loading) and test, where 4,000 one-second cycles of 150 N occlusal loading were applied. Twenty teeth were submitted to a microleakage test and then evaluated according to dye penetration. Significant statistical differences (Wilcoxon test, p=0.005<0.05) of leakage degree in enamel and cement were found in the control group. Significant statistical differences at <0.05 were also found in the test group, with p=0.045. After paired comparison of the control and test groups, a significant statistical difference was found at the enamel level (Mann-Whitney test, p=0.03). However, no significant statistical differences were found at the cement level (p=0.28). Therefore, it could be concluded that there was greater microleakage in cement compared to enamel, and occlusal loading has a decisive influence, as it increases the rate of microleakage.

Acid Etching, Dental↗
PubMed2005

Effect of insertion technique and adhesive system on microleakage of Class V resin composite restorations.

PURPOSE: To evaluate the effect of different insertion techniques and adhesive systems on microleakage of Class V composite resin restorations. MATERIALS AND METHODS: Forty-eight human molars were randomly assigned to four groups (n = 12). Standardized mixed Class V cavities (enamel and dentin margins) were prepared at the CEJ. A total-etch (Adper Scotchbond MultiPurpose) and a self-etching (iBond) adhesive system were evaluated using either an incremental or single-step (bulk) insertion technique. The preparations were restored with Esthet*X micromatrix hybrid composite. The teeth were thermocycled 1000 cycles, immersed in 1% methylene blue dye for 24 h, and invested in acrylic resin. The specimen blocks were then sectioned longitudinally, with dye penetration (microleakage) examined with a 20X binocular microscope. Enamel and dentin margins were scored separately for microleakage using an ordinal ranking system. Results were analyzed using non-parametric tests at a p < 0.05 level of significance. RESULTS: Significance was exhibited between the groups (adhesive material/insertion technique) at the coronal and apical margins. At the coronal margin, the total-etch adhesive/incremental insertion group exhibited significantly less leakage than the other groups, while at the apical margin, the total-etch adhesive/incremental insertion group showed significantly less leakage than the self-etching adhesive/bulk insertion group. Significantly less leakage was found at the coronal margins compared to the apical margins of the material/technique groups. CONCLUSION: The use of a total-etch adhesive system and incremental insertion of composite significantly reduced microleakage at the coronal and apical margins of Class V composite restorations.

Coloring Agents↗
PubMed2006

Technique for linear measurement on panoramic and periapical radiographs: a pilot study.

OBJECTIVE: This study was conducted to compare vertical and horizontal periodontal measurements of posterior teeth on standardized panoramic and intraoral radiographs. METHODS AND MATERIALS: Standardized panoramic and periapical radiographs were made of 16 human skulls using ball bearings placed on the maxillary first molars to allow adjustment for horizontal and vertical magnification. RESULTS: At 14 of 19 measurement sites there was no significant difference between measurements on the 2 radiographic film types. At 4 sites vertical measurements on panoramic radiographs were significantly larger than on periapical radiographs (0.80 to 1.37 mm). At one site horizontal measurements were significantly greater on periapical radiographs (0.88 mm). CONCLUSIONS: If there is adjustment of the raw data for magnification as suggested in this study, panoramic radiographs may be used for measurement studies in the posterior region once the patients are positioned appropriately within the focal trough of the machines and the magnification range for the posterior focal trough is used for adjustment of data.

Cephalometry↗
PubMed2006

[Effect of acid etching time on bonding interface of non-carious cervical sclerotic dentin].

OBJECTIVE: To examine the effect of acid etching time on the bonding interface of non-carious cervical sclerotic dentin. METHODS: Twenty extracted premolars with non-carious cervical lesions were randomly divided into two groups, the lesion surface was conditioned with Scotchbond Multi-Purpose Plus dentin bonding system. The etching time was 15 s and 30 s respectively. The bonding interface ultrastructures were compared with SEM. RESULTS: In sclerotic dentin (15 s), the hybrid layer was visible, with minimal resin tags in the dentinal tubules and, when presented, they were shorter. Doubling the etching time (30 s) resulted in more resin tags with an hybrid layer formation on peritubular dentin. CONCLUSION: Doubling the etching time improved the ultrastructure of sclerotic dentin-resin bonding interface, and could be an efficient way to improve the bonding effect.

Acid Etching, Dental↗
PubMed2006

Self-etching bonding systems: in-vitro micro-leakage evaluation.

The purpose of this in vitro study was to compare dentine and enamel micro-leakage values of six self-etching bonding agents to that of a total etch dentine bonding agent (used as a control). Products evaluated were Scotchbond Multipurpose Plus (3M/ESPE), Xeno III (Dentsply), Clearfil SE Bond (Kuraray), ABF (Kuraray), Optibond Solo Self-Etch (Kerr), OneCoatSE Bond (Colténe Whaledent), and iBond (Heraeus-Kulzer). Using a medium sized Cerana bur (Nordiska Dental) a standard, cylindrical preparation was made at the cemento-enamel junction (CEJ) of human third molars. The teeth were randomly divided into 7 groups of ten teeth each. The bonding agents were applied and light cured strictly according to the manufacturer's instructions and the cavities then filled in two increments, using Z100 composite (3M/ESPE). The restored teeth were imbedded in acrylic resin and thermocycled between 5 degrees - 60 degrees C (+/- 2 degrees C) for 250 cycles with a dwell time of 20 seconds. All seven groups were then placed in a 5% basic Fuchsin solution for 12 hours at 37 degrees C. The embedded teeth were removed from the basic Fuchsin, rinsed well, imbedded in acrylic and cut longitudinally through the centre of each restoration using an Accutom-2 cutting machine. Each tooth was then evaluated at the occlusal enamel margin and at the cervical dentine margin for micro-leakage using a light microscope at 50x magnification. The data obtained was analysed using the Kruskal-Wallis test, with Fisher's least significant difference method used for comparison of specific groups (p<0.05). When compared to the control (Scotchbond Multipurpose Plus), results for microleakage at the occlusal enamel margins as well as the cervical dentine margins indicated that only SE Bond and ABF (Protect Bond) showed values as low as the control. It can be concluded that, as far as micro-leakage is concerned, Clearfil SE Bond and ABF (Protect Bond) self-etching bonding agents could be clinically acceptable alternatives to the clinically proven Scotch-bond Multipurpose. The other products showed more microleakage.

Acid Etching, Dental↗
PubMed2006

Effect of the number of coats of simplified adhesive systems on microleakage of dentin-bordered composite restorations.

AIM: This study tested the null hypothesis that there is no difference on microleakage of dentin-bordered composite restorations using single or double coats of adhesive from one-bottle adhesive systems. METHODS AND MATERIALS: The enamel surface was removed from freshly extracted bovine teeth, and standardized Class V cavities (3 x 3 x 1.5 mm) were made at the cervical areas of buccal surfaces. Teeth were restored and grouped according to type of adhesive systems [Prime Bond 2.1 (PB2.1), Prime & Bond NT (PBNT), and Single Bond (SB)] and to the number of coats (one or two) to be used. The restorations were polished and immersed in a 0.5% aqueous solution of basic fuchsin for four hours. Teeth were then sectioned and the most infiltrated section of each tooth was selected under magnification, scanned, and quantitatively analyzed using a computer program. Data were analyzed using two-way analysis of variance (ANOVA) and Student-Newman-Keuls (a=0.05). RESULTS: Groups without filler content (PB2.1 and SB) showed no difference in microleakage using single or double coats. However, PBNT (with nanofiller) showed statistically less microleakage when only one coat was applied. The influence of the number of coats of the adhesive systems on dentin margin microleakage was material dependent. CONCLUSION: All adhesive systems demonstrated microleakage, however, it could be minimized using two coats of non-filled or one coat of a filled adhesive system.

Acetone↗
PubMed2006

[Micro-tensile bond strength to sclerotic dentin in non-carious cervical lesions].

OBJECTIVE: This in vitro study was to evaluate the micro-tensile bond strength (microTBS) of three adhesives to sclerotic dentin in non-carious cervical lesions. METHODS: The maxillary premolars extracted due to periodontitis and with non-carious cervical lesions were collected. The non-carious, natural cervical sclerotic lesions were bonded with a total-etching adhesive Scotchbond Multi-Purpose, a two-step self-etching adhesive Contax, and an all-in-one self-etching adhesive Adper Prompt L-Pop. Artificially prepared wedge-shaped lesions were also made in sound premolars and bonded with the same adhesives as the controls. MicroTBS of these three adhesives was measured. RESULTS: MicroTBS of Scotchbond and Contax to sclerotic dentin was significantly lower than to normal dentin. But microTBS of Adper Prompt L-Pop to normal dentin was significantly lower than to sclerotic dentin. MicroTBS to sclerotic dentin was Scotchbond 46.805 MPa, Adper Prompt L-Pop 39.045 MPa, and Contax 29.852 MPa. CONCLUSIONS: In sclerotic dentin the microTBS was decreased because of the inferior micro-morphology of resin tags. Adhesives with low pH value might bond to sclerotic dentin effectively.

Bisphenol A-Glycidyl Methacrylate↗
PubMed1989

[S E M study of vascular architecture of periodontal ligament under chronic marginal periodontitis].

The present study was carried out by fabrication of microcorrosive resin cast to investigate the vascular changes of periodontium of dogs' mandibular incisors with severe mobility and deep pocket formation concomitant with suppuration and alveolar bone loss. With aid of the dissolution of soft tissues by protease, alveolar bone remained left with resin cast of specimen, which then was referred for scanning electron microscopic examination. Results were as follows: 1. The vasculature of inner gingival epithelium which originally appeared as a flat, mesh-like network underwent a conformational change and turned out to be a vasculature with glomerulus-like loops due to chronic inflammation. 2. No remarkable change was ever identified in vasculature of periodontal ligament surrounding cervix of tooth. 3. Certain parts of vasculature of periodontal ligament disappeared, which combining with the occlusion indicated the occurrence of occlusal trauma. 4. Exposed alveolar bone surface where the periodontal vasculature disappeared showed an amorphous, flat surface. Quite contrast to this, the surface of alveolar bone on which the vasculature is located appeared undergoing a resorptive process. 5. Accordingly, the damage occurred in periodontium was not merely due to chronic inflammation but to the accompanying occlusal trauma which was supposed to be a predominant factor.

Alveolar Bone Loss↗
PubMed1994

Cervical enamel projection related to furcation involvement.

Reviewing the literature the authors show the importance of cervical enamel projections (CEP) in the involvement of molar furcation. The dento-gingival relationship of CEP structure is peculiar for not having connective attachment but only long junctional epithelium. In numerous studies, most mandibular and maxillary molars presented CEP, mainly of little extension, with an incidence ranging from 8.8 to 87.4%. The studies showed a relationship between cervical enamel projection and the presence of inflammatory periodontal disease, and furcation involvement of molars. These data suggest that a detailed clinical trial must be carried out as well as early diagnosis of periodontal disease at the region of furcation.

Dental Enamel↗
PubMed1996

Sealing performance of Scotchbond Multi-Purpose-Z100 in Class II restorations.

PURPOSE: To evaluate the sealing ability of Class II Scotchbond Multi-Purpose/Z100 composite restorations placed under in vivo and in vitro conditions. MATERIALS AND METHODS: For the in vivo part, Class II preparations were cut in posterior teeth which were scheduled for extraction for periodontal reasons. The cervical margins ended in dentin-cementum, 1 mm below the CEJ. The teeth were extracted after 2-3 months of clinical service. The in vitro part was performed in extracted posterior teeth, free from restorations and caries, following the same in vivo protocol. The in vivo and in vitro samples were processed and evaluated for marginal leakage. RESULTS: Leakage by dye penetration was observed at the cervical margins in 70% of the in vivo and in 50% of the in vitro specimens. All in vivo samples with no leakage at the cervical margin were restored where the adjacent interproximal tooth was missing. In more than 40% of the restorations placed in vivo, leakage was also found at the occlusal margins. Statistically significant differences were found at the cervical margins between in vivo and in vitro groups (P < 0.05). The in vitro samples can be of only limited value in predicting clinical performances of an enamel-dentin bonding system in Class II restorations.

Aged↗
PubMed1996

Effect of a surface sealant on microleakage of Class V restorations.

PURPOSE: To evaluate the effect of a low-viscosity surface-penetrating sealant on microleakage around Class V restorations. MATERIALS AND METHODS: Box-shaped Class V preparations were made in the facial and lingual surfaces of 50 extracted human teeth. Occlusal margins were in enamel and gingival margins were in dentin/cementum. Preparations were restored with the following systems (n = 20): Dentin Conditioner + Fuji II LC; ProBond primer + VariGlass VLC; OptiBond + XRV Herculite; Scotchbond Multi-Purpose + Silux Plus; and Scotchbond Multi-Purpose + Restorative Z100. Half of the restorations in each group were randomly selected and sealed with Fortify resin immediately after finishing and polishing. Specimens were thermocycled 500x between 5 degrees and 55 degrees C and subjected to a silver nitrate microleakage test. Penetration of the silver nitrate tracer was evaluated and recorded using a 0-4 ordinal scale. Data were analyzed using non-parametric statistical tests. RESULTS: All of the restorative systems had very little leakage at enamel margins, regardless of whether the resin sealant was used. Each of the systems except VariGlass had minimal leakage at unsealed dentin margins also. Application of the resin sealant significantly reduced leakage at the interface between VariGlass and dentin or cementum, but had no effect on the other restorative systems.

Acrylic Resins↗
PubMed1996

Clinical evaluation of tooth-colored materials in cervical lesions.

PURPOSE: To determine the 18-month clinical performance of four tooth-colored restoratives in non-carious cervical lesions. MATERIALS AND METHODS: Buccal abrasion lesions in 83 teeth were restored with each of the following materials: Fuji Cap II, Fuji II LC, APH/Universal Bond 3, Lite Fil II A/Imperva Bond. Baseline and an 18-month recall was carried out using the Ryge (USPHS) method for retention, color match, marginal adaptation, cavosurface marginal discoloration, anatomic form and secondary caries. RESULTS: The USPHS results (% alfa) for the four products were, respectively: color match (9%, 48%, 57%, 55%), marginal discoloration (71%, 76%, 52%, 50%), marginal adaptation (24%, 24%, 33%, 15%), anatomic form (67%, 86%, 95%, 45%) and retention (100%, 95%, 100%, 65%). Results indicated that (1) Fuji Cap II exhibited a poor color match at baseline (2) Color matching of Fuji II LC was comparable to the resin composites and (3) seven Lite Fil II/Imperva Bond restorations (35%) were dislodged after 1 1/2 years.

Aged↗
PubMed1996

Class V restorations utilizing a new compomer material: a case presentation.

Restorative materials used in the anterior cervical region should be able to restore the affected area in an aesthetic manner, require only a minimal amount of tooth structure removal, and provide protection from further cervical decalcification. The latest generation of restorative materials have combined the qualities of composite resins and glass-ionomers. Some of these materials incorporate resin components into glass-ionomer systems and are termed resin-modified glass-ionomers; others add glass-ionomer particles to acidic polymerizable monomers in a resin matrix and are commonly called "compomers." The learning objective of this case report is to present a step-by-step clinical procedure for restoration of a Class V defect in the maxillary anterior region, using a recently introduced "compomer."

Adult↗
PubMed1996

Direct tooth-colored materials for noncarious lesions: a 3-year clinical report.

One hundred fifty-nine noncarious cervical lesions were restored with glass-ionomer cement, resin composite used with a dentinal bonding agent, or the laminate (sandwich) restoration, which combines both these materials. These restorations were evaluated at baseline, 1 year, and 3 years for color match, cavosurface marginal discoloration, anatomic form, marginal adaptation, and retention. There was a general deterioration of the restorations with time. Lesions restored with resin composite and a dentinal bonding agent exhibited the highest percentage of lost restorations.

Adult↗