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Biomedical subjects

A B Fuks

Publications and source records attributed to A B Fuks.

At least 37 records · Page 2Linked to original sources
PubMed1983

Marginal adaptation of glass-ionomer cements.

The effect of thermocycling on the marginal adaptation of two glass-ionomer cements was determined by means of scanning electron microscopy. Small gaps in the cement as well as at the enamel-cement interface were observed after curing, but these phenomena were not enhanced by thermocycling. Localized areas of surface deterioration were observed for both cements after thermocycling.

Dental Bonding↗
PubMedDate not supplied

The effect of metoclopramide and hydroxyzine in sedation of infants undergoing dental treatment.

The purpose of the present study was to determine whether the administration of 5 mg of the anti-emetic drug metoclopramide (MTP) would improve the effectiveness of 3.7 mg/kg of hydroxyzine (HYZ) in dental treatment of young patients. Thirty uncooperative children, with a mean age of twenty-nine months, and needing at least two restorative visits, participated in this study. The patients were assigned randomly to receive either 3.7 mg/kg HYZ or the same drug in conjunction with MTP; alternate regimens were administered at the two appointments. All the children received 50 percent nitrous oxide, and were restrained in a Papoose Board with a head holder. The following parameters were evaluated at baseline (before initiation of treatment), and at five-minute intervals throughout the procedure: degree of alertness, crying and movement. Evaluation of the overall behavior at each session was performed by one investigator, who was blind to the drug regimen the child had received, utilizing a separate rating scale. The results were submitted to statistical analysis. No differences were observed in the behavior of the children receiving both regimens. Successful sedation, as assessed by lack or minimal crying and/or movement was observed in all the treatment visits, with both regimens (mean score 4.4 for HYZ + MTP and 4.6 for HYZ). In the few occasions, however, where the restorative sessions were longer (45 to 60 minutes), more children fell asleep after receiving protocol A (pramin + hydroxyzine), suggesting a possible trend to improve effectiveness in these situations. No adverse effects were observed, and all the treatments were successfully completed. Although no significant differences could be observed in treatments lasting up to a half hour, the addition of MTP could help in sedations lasting longer than a half hour.

Anesthesia, Dental↗
PubMedDate not supplied

Assessment of compomer proximal restorations in primary molars: a retrospective study in children.

The aim of the present retrospective study was to observe the clinical and radiographic performances of a compomer (Dyract) in proximal restorations of primary molars as compared to amalgam restorations. The study was performed at the principal investigator's office. Children between three to eleven years old, who had at least two primary molars with a small to moderate approximal caries lesion were included in the study. The assessed material consisted of 107 proximal restorations (63 Dyract and 44 amalgam) placed in primary molars during the years 1994 to 1997 in forty-two children who were available for follow-up examinations. All the evaluated restorations were clinically acceptable, with smooth surface appearance, satisfactory color match, neither secondary caries nor fracture. The margins of two Dyract restorations presented minimal stain. Of the 63 Dyract restorations evaluated radiographically, two presented with bubbles, one with an overhang, and nine had pooling at the tooth-restoration interface. Minimal overhangs were disclosed in six amalgam restorations, and neither bubbles nor defects were seen at the tooth-restoration interface. These differences were statistically significant (p < 0.001). Based on the clinical performance of the material and on the radiographic findings, the authors conclude that Dyract can be a suitable alternative for restoring primary teeth that need to be retained up to two years. More extensive follow-up is needed to assess longer-term performance.

Child↗
PubMedDate not supplied

Clinical performance of esthetic posterior crowns in primary molars: a pilot study.

PURPOSE: The aim of this pilot study was to assess the clinical performance of esthetic crowns and to compare these to conventional stainless steel crowns (SSC). METHODS: Twenty two crowns (11 conventional and 11 esthetic) were placed in mandibular primary molars obeying the following criteria: the tooth was not mobile; no fistulae were present; the tooth had at least one caries free or properly restored antagonist and had to be in contact with one adjacent tooth mesially, in the case of the primary second molars or distally in the case of the primary first molars. Crown preparation was done in a conventional manner, but reduction was more extensive for the thicker esthetic crowns, to allow for proper occlusion. The crowns were evaluated clinically and radiographically after 6 months and the following parameters were assessed: gingival health, marginal extension, crown adequacy, proper position or occlusion, proximal contact, chipping of the facing (for esthetic crowns) and cement removal. RESULTS: At the 6 month evaluation all esthetic crowns were intact, without chipping of the facing, and no excess of cement was observed in both groups. No difference was found for marginal extension, occlusion, proximal contact, crown adequacy, and bone resorption, but a significant difference was found for periodontal health between esthetic crowns and conventional SSC (P < 0.001 McNemar test). CONCLUSIONS: The esthetic crowns assessed had several inconveniences, as they resulted in poor gingival health, are very expensive, and, although not measured, are bulky and without a natural appearance.

Cementation↗
PubMedDate not supplied

Clinical and radiographic assessment of Class II esthetic restorations in primary molars.

PURPOSE: The aim of the study was to access the clinical performance of two esthetic materials (Vitremer and Z100 + Scotchbond Multipurpose) when used as Class II restorations in primary molars, and compare them to amalgam controls. METHODS: A total of 102 restorations were placed in primary molars of 29 schoolchildren; 40 were of Vitremer, 38 of Z100 + Scotchbond Multipurpose, and 24 of amalgam (Dispersalloy). The restorations were evaluated clinically at baseline and after 6, 12, 18, 24 months, or until tooth exfoliation or patient drop-out, following the modified Cvar and Ryge criteria. Radiographs were taken at yearly intervals, and the radiograph of the last examination available was assessed and scored. RESULTS: The majority of the restorations examined clinically up to 18 months was good (Alpha according to Cvar and Ryge), and no statistically significant differences between the groups was observed. However, at the 19-24 months evaluation, Z100 rated better than Vitremer for surface appearance and color match. The prevalence of radiolucent defects at the cervical margin for the Z100 (47%) was significantly higher than for amalgam (11%) restorations (P = 0.002) and for Vitremer (13%) restorations (P = 0.008). CONCLUSION: The three materials evaluated (Vitremer, Z100 and Dispersalloy) presented satisfactory clinical performance during the time evaluated (approximately 2 years). Approximately half of the composite resin restorations presented radiographic defects that might require replacement at a later date. In contrast, glass ionomer and amalgam restorations presented significantly less radiographic defects at the time of the final examination. This study suggests that composite resins are indicated for classII restorations in primary molars that are expected to exfoliate within two years.

Analysis of Variance↗
PubMedDate not supplied

Mineral trioxide aggregate vs. formocresol in pulpotomized primary molars: a preliminary report.

PURPOSE: The aim of this study was to compare the effect of mineral trioxide aggregate (MTA) to that of formocresol (FC) as pulp dressing agents in pulpotomized primary molars with carious pulp exposure. METHODS: Forty-five primary molars of 26 children were treated by a conventional pulpotomy technique. The teeth were randomly assigned to the MTA (experimental) or FC (control) group by a toss of a coin. Following removal of the coronal pulp and hemostasis the pulp stumps were covered with an MTA paste in the experimental group. In the control group, FC was placed with a cotton pellet over the pulp stumps for 5 minutes and removed; the pulp stumps were then covered by zinc oxide-eugenol (ZOE) paste. The teeth of both groups were restored with stainless steel crowns. Eighteen children with 32 teeth arrived for clinical and radiographic follow-up evaluation ranging from 6 to 30 months. RESULTS: The follow-up evaluations revealed only one failure (internal resorption detected at a 17 months postoperative evaluation) in a molar treated with formocresol. None of the MTA-treated teeth showed any clinical or radiographic pathology. Pulp canal obliteration was observed in 9 of 32 (28%) evaluated molars. This finding was detected in 2 out of the 15 teeth treated with FC (13%) and in 7 out of the 17 treated with MTA (41%). CONCLUSION: MTA showed clinical and radiographic success as a dressing material following pulpotomy in primary teeth and seems to be a suitable replacement for formocresol in primary teeth.

Aluminum Compounds↗
PubMedDate not supplied

Microleakage of Class 2 glass-ionomer-silver restorations in primary molars.

The aims of this study were to assess microleakage at the cervical margins of class 2 "sandwich" restorations placed with two glass-ionomer-silver cements in primary molars, to compare the quality of the occlusal margins of these restorations to those prepared with Miracle Mix and Ketac Silver, and to assess by scanning electron microscopy (SEM) the marginal micromorphology of those restorations. Fifty-two class 2 restorations were prepared in extracted primary molars and were restored as follows: 1) Ketac Silver + Estilux Posterior (sandwich), 2) Miracle Mix + Estilux Posterior (sandwich), 3) Ketac Silver only, and 4) Miracle Mix only. No or minimal leakage was evident in most of the occlusal margins, whereas severe leakage was observed in almost 70% of the cervical margins of the Ketac Silver groups. Scanning electron microscopy evaluation demonstrated good adaptation at the buccal and lingual margins of all the restorations. Sixty-seven percent of the Miracle Mix restorations had no defects at the cervical margins, as opposed to only 17% of those with Ketac Silver.

Cermet Cements↗
PubMedDate not supplied

Pulp response to collagen and glutaraldehyde in pulpotomized primary teeth of baboons.

This investigation assessed histologically the pulp tissue reaction to glutaraldehyde (GA) and to a commercial collagen preparation in pulpotomized primary teeth of baboons. One hundred and eighty-eight primary teeth were pulpotomized; in half of them inflammation was induced prior to the treatment. The teeth were divided into five groups: in three of them GA was used as a pulp dressing and applied for 1 min (group 1), 5 min (group 2), or mixed into the paste (group 3); collagen was used in group 4 and in group 5 (control) IRM was placed directly over the pulp stumps. Follow-up times were two, eight, and 24 weeks. Total necrosis was observed only in the collagen group. Partial necrosis and severe inflammation also were seen mainly in this group, and when the GA was incorporated into the paste. Slight to moderate inflammation was evident in all groups two and eight weeks postoperatively; however, 78% of the teeth of group 2 (GA 5 min) were inflammation-free after 24 weeks. Partial dentin bridges were seen in 92% of the teeth of the control group, in 82% of group 2, and 50% each of groups 1 and 3 eight weeks postoperatively. Dentin bridges were present in only 4% of the collagen group. After 24 weeks, all the teeth in group 2 and 83% of group 1 had dentin bridges. We conclude that Zyderm (Colagen Corp. Palo Alto, CA) led to unacceptable results, 5 min application of GA presented the best healing response, and GA 1 min and IRM also were satisfactory.

Animals↗