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At least 1,117 records · Page 62Linked to original sources
PubMed2001

Acid conditioning combined with single-component and two-component dentin bonding agents.

OBJECTIVE: The purpose of the present study was to compare ethylenediaminetetraacetic acid conditioning and phosphoric acid conditioning of dentin in combination with two principally different commercial dentin bonding systems. METHOD AND MATERIALS: Twenty-one extracted human third molars were used. All teeth were caries free, and no teeth were root filled. In total, 29 pairs of dentin surfaces were obtained from 21 teeth. One dentin surface in each pair was etched with a 32% phosphoric acid gel for 15 seconds, and the opposite surface was etched with a 24% ethylenediaminetetraacetic acid gel for 3 minutes. One experimental group of 15 dentin surface pairs was subsequently bonded with All-Bond 2, a two-component system, and the other group of 14 pairs was bonded with Prime & Bond NT, a one-bottle adhesive. A flowable resin composite was inserted in the experimental cavity and light cured. Shear bond strength testing was performed according to the protocol of the International Organization for Standardization. RESULTS: The combination of conditioning with ethylenediaminetetraacetic acid and bonding with All-Bond 2 was significantly better than all other combinations, providing a shear bond strength that was 61% to 123% greater. CONCLUSION: Use of ethylenediaminetetraacetic acid in combination with All-Bond 2 resulted in a significantly greater bond strength to dentin than did conventional acid etching.

Acid Etching, Dental↗
PubMed2002

Oral status, aesthetic materials and frequency of crowns and bridges in patients with fixed prosthetic appliances living in the Metković region.

The aim of the study was to examine oral status in patients of the Metković region with fixed prosthodontic appliances. The aim was also to evaluate aesthetic materials used, and difference between the frequency of crowns and bridges dependent on patient's age and frequency of visits to dentist. The examination was performed on 212 dental patients with fixed prosthetic appliances, from the Public Health Center "Metković". A questionnaire was created for the purpose of this study and was filled in by the patients. The dentist registered oral status. Descriptive statistics and chi 2 tests were used for the data analysis. Following conclusions were made: 1. The examined patients had relatively high caries (tooth decay), gangrene and residual roots prevalence, the oral hygiene was not appropriate, calculus and gingivitis were diagnosed in all patients (100%) and these facts point out to the insufficient preventive oral health care in the Metković region, as well as to the insufficient self-perception on the proper oral hygiene maintenance. 2. Patients who visit their dentist regularly (once a year or more) have significantly more crowns than bridges than the patients who visit their dentist irregularly or when in pain (p < 0.01). 3. Almost all fixed prosthetic appliances not older than 10 years were made of porcelain (98%), while acrylic veneer crowns (or chromasite) were more frequent in appliances older than 10 or 15 years (p < 0.01). There was no gender difference dependent on the material used (p > 0.05). High frequency of porcelain was attributed to the high economic status of this region, as well as to a dentist's preference.

Croatia↗
PubMedDate not supplied

[The evaluation and rehabilitation of the abutment teeth of fixed partial dentures].

Thorough evaluation of all structures that might contribute support to a prosthesis must certainly include natural teeth, since their number, location in the arch, individual position, mobility, vitality, crown-to-root ratio, root size and shape, susceptability to caries and pathologie involvement. One of the most important observations affecting treatment planning involves the condition of the occlusal plane of the remaining natural teeth. The use of periodontally weakened teeth as abutments is often debated but the prognosis of periodontal therapy and thus the possibility of using periodontally diseased teeth for prosthesis include: 1. The extention of the disease involvement. 2. Duration and progression. 3. Causative factors, including occlusal, bone level, pocket-dept and furcation involvement and 4. Attitude, cooperation and determination to provide home care. The development and the maintenance of bacterial plaque on the teeth is considered as a primary factor that causes inflammation and effects the Biological future of fixed prosthesis.

Dental Abutments↗
PubMed1983

Root resorption associated with autotransplanted maxillary canine teeth.

A brief review of the published results of autotransplanting maxillary canine teeth has been presented together with the results of a prospective study in which 141 maxillary canine teeth were surgically repositioned in 113 patients, but not root-treated unless resorption occurred. Attention was given to assessing factors (age, sex, tooth positions, surgical difficulty, time out of mouth, acute infection, periodontal disease, caries, occlusion, formation of lamina dura) associated with root resorption of the transplanted teeth but no particular factor of significance emerged. It has been speculated that early post-operative root canal treatment and/or a two-stage technique might reduce the incidence of root resorption of autotransplanted teeth.

Adolescent↗
PubMed2004

The presurgical workup before third molar surgery: how much is enough?

PURPOSE: We sought to assess the indications for patient referral for computed tomography (CT) scan before third molar extraction. The influence of the data obtained from the CT scans on the surgical outcome and morbidity was also evaluated. PATIENTS AND METHODS: There were 189 patients in the study (120 females and 69 males). Sixty-five patients were referred to receive CT and formed the study group. The remaining patients were included in the control group. RESULTS: There were no statistically significant differences between the groups with regard to demographic data and tooth and root angulations. Indications for tooth extraction such as pain, swelling, pericoronitis, caries, endodontic problems, pathology, and prosthetic considerations were similar. The proximity of the tooth root to the inferior alveolar canal was the only statistically significant difference between the 2 groups (P <.001). The treatment plan outcomes for extraction, surgical extraction, and follow-up were comparable. The surgeon changed the initial decision from "surgical extraction" to "follow-up" in only 1 case after CT scan. CONCLUSIONS: Within the limits of the present study, it can be concluded that the main reason for CT scan referral is the proximity of the third molar root to the inferior alveolar canal (<1 mm). The data obtained from the CT scan had minimal effect on the final surgical outcome. The routine use of CT scan in cases of third molar extractions cannot be recommended.

Adolescent↗
PubMed1995

De/remineralization from sodium fluoride dentifrices.

PURPOSE: To test the demineralization/remineralization effects of sodium fluoride dentifrices using an in situ single-section crown model system. MATERIALS AND METHODS: A fluoride dose response was evaluated using 0, 1100 and 2800 ppm F-, along with the effects of an enhanced fluoride delivery system (polyampholyte-NaF). The single-section crown model was employed with supervised toothbrushing twice a day. At the end of each 1-month study leg, sections were removed and replaced with new sections for the next leg. Both before and after the double-blind, crossover portion of the study, sections were evaluated by polarized light microscopy and microradiography. The change in mineral content of the enamel and root lesions was analyzed by ANOVA with a Waller-Duncan K-Ratio Test post hoc. RESULTS: The placebo dentifrice group showed a loss of mineral and was statistically different from all groups. The fluoride dentifrices showed increasing amounts of enamel mineral gain, with increasing fluoride concentration. The polyampholyte-NaF delivery system with 1100 ppm F- was equivalent to the 2800 ppm F- dentifrice. Root lesions gave similar rank-order results although all treatments showed demineralization or mineral loss.

Adult↗
PubMed2006

[Efficient methods of prevention and treatment of permanent first molars before completion of root formation].

Examination of first molars among 124 children, age range 7-8 years, showed high intensity of caries disease. Detection and prevention of risk factors, also practical use of prevention and treatment methods existed in clinical stomatology, especially before completion of root formation of permanent teeth, is extremely important. Results showed that deep fluoridation of fissures of permanent teeth with enamel Hermetisation Liquid (A. Knappfost) is very effective method for preventing dental caries. Caries was reduced in 96% of cases. Cultivation of cavity with above-mentioned solution, right before restoration prevents reoccurrence of caries and pulpal complications that is very important for future growth and formation of roots of permanent teeth and for functional value of permanent teeth themselves.

Child↗
PubMed1983

Prevalence of retained roots in the Finnish adult population.

The prevalence of retained roots among Finnish adults was evaluated by examining a representative sample of 8000 Finnish adults aged 30 or older. The participation percentage was 89.6. Retained root was recorded when more than half the height of the tooth surfaces had been destroyed by caries. The reproducibility coefficient (kappa) for clinical recordings of retained roots was 0.79 for intraexaminer cases and 0.65 for interexaminer cases. Fifteen percent of the subjects had one or more retained roots. Prevalence was twice as great among males as among females. The mean number of retained roots was 0.4 per subject. Of all teeth in the mouth, 4.4% had only the roots left. On the population level, some 343000 adult Finns were estimated to have at least one retained root.

Adult↗
PubMed1995

Morphologic criteria for root canal treatment of primary molars undergoing resorption.

The endodontic anatomy of primary molars is difficult to predict because of the balance of resorption and hard tissue deposition. In particular, the resorption causes perforating lacunae across the wall of the root, even at the furcation level, and modifies shape, dimension and position of endodontic apex. The phenomenon can be so deep as to compromise endodontic therapy. The first aim of the study was to verify if reliable criteria can be found for treatability in primary molars undergoing resorption, i.e. if it is possible to predict if perforating lacunae are present or not. The second aim of the study was to verify if other informations needed for endodontic treatment, as shape, dimension and location of the apex, and curvature of the root canal can be predicted. For the study, 80 extracted primary molars, 75 of which pulpally involved by caries, were selected. The treatability was evaluated in term of root length, root shape, dimension and shape of endodontic apex, age of the patient and X-ray index of resorption. The association between variables was performed by multiple correspondence analysis. The results suggested that root length was the most reliable criterion of the integrity of the root. The borderline of treatability was at the length of 4 mm. The position of endodontic apex related to anatomical apex, and the lingual related to the buccal root length were analyzed by linear regression analysis. The canal length was often similar to the root length (i.e. the endo and anatomical apices were very close) in lower and upper molars. However, in lower molars, if two or more canals were present in the same root, a discrepancy was observed between buccal and lingual root length. This finding was constant in first lower molars. In addition regression analysis provided a linear function between the lengths of the buccal and lingual side of the same root in lower molars. Its coefficient b was 0.73.

Analysis of Variance↗