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Biomedical subjects

Paul-Georg Jost-Brinkmann

Publications and source records attributed to Paul-Georg Jost-Brinkmann.

9 recordsLinked to original sources
PubMed2006

Effect of light-tip distance on the shear bond strengths of resin-modified glass ionomer cured with high-intensity halogen, light-emitting diode, and plasma arc lights.

INTRODUCTION: The purpose of this study was to assess the effect of light-tip distance on the shear bond strength and the failure site of brackets cured with 3 light-curing units (high-intensity halogen, light-emitting diode, and plasma arc). METHODS: One hundred thirty-five bovine mandibular permanent incisors were randomly allocated to 9 groups of 15 specimens each. Stainless steel brackets (Victory Series, Unitek/3M, Monrovia, Calif) were bonded with a resin-modified glass-ionomer (Fuji Ortho LC, GC Europe, Leuven, Belgium) to the teeth, and each curing light was tested at 3 distances from the bracket: 0, 3, and 6 mm. After bonding, all samples were stored in distilled water at room temperature for 24 hours and subsequently tested for shear bond strength. RESULTS: When the 3 light-curing units were compared at a light-tip distance of 0mm, they showed no significantly different shear bond strengths. At a light-tip distance of 3 mm, no significant differences were found between the halogen and plasma arc lights, but both lights showed significantly higher shear bond strengths than the light-emitting diode light. At a light-tip distance of 6 mm, no significant differences were found between the halogen and light-emitting diode lights, but both showed significantly lower bond strengths than the plasma arc light. When the effect of the light-tip distance on each light-curing unit was evaluated, the halogen and light-emitting diode lights showed no significant differences among the 3 distances. However, the plasma arc light produced significantly higher shear bond strengths at a greater light-tip distance. No significant differences were found among the adhesive remnant index scores of the various groups, except with the LED light at a distance of 3 mm. CONCLUSIONS: In hard-to-reach areas, the plasma arc curing light is suggested for optimal curing efficiency.

Acrylic Resins↗
PubMed2005

Plaque and gingivitis reduction in patients undergoing orthodontic treatment with fixed appliances-comparison of toothbrushes and interdental cleaning aids. A 6-month clinical single-blind trial.

AIM: Comparison of the efficacy of different oral cleaning devices to improve dental hygiene in patients with multibracket appliances. SUBJECTS AND METHODS: In a single-blind four-way crossover clinical trial, the following toothbrushes and cleaning aids were tested over 6 months to determine their efficacy in removing plaque and preventing gingivitis: the (A) manual interX short brush-head toothbrush (elmex), the (B) Sonic Speed SR-100E sonic toothbrush (Water Pik), the (C) Sonic Speed toothbrush in conjunction with the electric interdental cleaning device Flosser FL-110 (Water Pik), and (D) the Sonic Speed sonic toothbrush in conjunction with multi-floss 3-phase dental floss (elmex). Forty patients were randomly split up into four groups. Each group brushed their teeth for 4 weeks using cleaning aids/combinations A, B, C or D in different orders. The trial organization was controlled by a computer system that also assisted in recording the modified Quigley Hein Index (mQHI) and Papillary Bleeding Index (PBI) every two weeks using voice control. RESULTS: Initial improvement was observed with all cleaning aids/combinations, but after 4 weeks of application, conditions deteriorated again--except one. After 4 weeks of application, only cleaning involving the combined use of the sonic toothbrush and the Flosser FL-110 (C) was found to be significantly more effective than cleaning with the manual toothbrush (A), and that was mainly attributed to the flosser. In patients with good oral hygiene (mQHI(initial) < or = 1.4), no improvement was observed with any of the cleaning aids (A-D). CONCLUSIONS: Plaque and gingivitis can be reduced--especially in patients with poor oral hygiene (mQHI(initial) > or = 1.5)-by using an interdental cleaning aid. In the long run, the Flosser FL-110 is more effective than multi-floss 3-phase dental floss.

Adolescent↗
PubMed2005

Chlorhexidine in cleft lip and palate patients with multibracket appliances. Results of a prospective study on the effectiveness of two different chlorhexidine preparations in cleft lip and palate patients with multibracket appliances.

AIM: The aim of this study is to reduce the caries risk in cleft lip and palate (CLP) patients with multibracket appliances via a compliance-independent method. PATIENTS, MATERIALS AND METHODS: Sixty-eight CLP patients with multibracket appliances were submitted to professional tooth cleaning at 4-week intervals. After randomization, patients in group A wore a splint filled with chlorhexidine (CHX) gel (Chlorhexamed) for 15 minutes (3 x 5 min) every 12 weeks. Patients in group B were treated with CHX varnish (EC40) every 12 weeks. Fluoride varnish (Fluoridin) was applied to all teeth 4 and 8 weeks after the respective CHX treatments. Regular salivary bacteria counts (CRT) were carried out to determine therapeutic effectiveness. Initial DMFS values were compared to the final ones. RESULTS: Initial findings of the salivary test and DMFS index confirmed the high caries risk. The DMFS value increased dramatically in both groups despite this systematic prophylaxis program. The bactericidal effect of both CHX preparations turned out to be markedly weaker than that described in the literature. CONCLUSIONS: Though the CHX and fluoride application had a limited effect (at least in this test population), one should keep in mind that it is precisely this population that requires very intensive prophylaxis, and that no antibacterial adjuvant is more effective than CHX. However, the application interval should be individually adapted to the bacteria count.

Adolescent↗
PubMed2005

Effect of light-tip distance on the shear bond strengths of composite resin.

The purpose of this study was to assess the effect of light-tip distance on the shear bond strength and failure site of brackets cured with three different light curing units: a high-intensity halogen (Astralis 10, 10-second curing), a light-emitting diode (LED, e-Light, six-second curing), and a plasma arc (PAC System, four-second curing). One hundred and thirty-five bovine permanent mandibular incisors were randomly allocated to nine groups of 15 specimens each. Stainless steel brackets were bonded with a composite resin to the teeth, and each curing light was tested at zero, three, and six mm from the bracket. After bonding, all samples were stored in distilled water at room temperature for 24 hours and subsequently tested for shear bond strength. When the three light curing units were compared at a light-tip distance of zero mm, the three lights showed no significantly different shear bond strengths. At light-tip distances of three and six mm, no significant differences were found between the halogen and plasma arc lights, but both lights showed significantly higher shear bond strengths than the LED light. When evaluating the effect of the light-tip distance on each light curing unit, the halogen light showed no significant differences between the three distances. However, the LED light produced significantly lower shear bond strengths at a greater light-tip distance, and the plasma arc lamp showed significantly higher shear bond strengths at a greater light-tip distance. In hard-to-reach areas, the use of PAC system is suggested, whereas the LED evaluated in this study is not recommended.

Acrylic Resins↗
PubMed2004

Plasma versus halogen light: the effect of different light sources on the shear bond strength of brackets.

The aim of this study was to investigate differences between plasma and halogen light polymerization in relation to the attainable shear bond strength of brackets bonded with various adhesives. 720 brackets were divided into 72 different groups of n = 10. The brackets were bonded to 240 flat polished test specimens produced from bovine teeth, Pontor MPF alloy, and extra hard plaster (type III) respectively. Transbond XT, Kurasper F or Fuji Ortho LC served as adhesives to bond either ceramic (Transcend 6000) or stainless steel brackets (Mini Uni-Twin). 50% of all brackets were bonded with a minimum layer of adhesive, and the remaining 50% with an adhesive layer thickness of 1.0 mm. In 360 cases the adhesive was polymerized with a plasma light (PAC), and in a further 360 cases with a halogen light (Optilux 401). The light curing time was 10 s with plasma light and 40 s with halogen light. After 24 h of storage in deionized water at room temperature, all brackets were subjected to a shear bond strength test according to ISO standard 10477. The measured shear bond strength did not differ significantly between the two curing light sources. The 1 mm adhesive layer thickness group showed significantly higher shear bond strengths in comparison to the minimum layer thickness group.

Dental Bonding↗
PubMed2004

Comparison of tongue functions between mature and tongue-thrust swallowing--an ultrasound investigation.

Many studies have proved that tongue thrusting plays a significant role in the etiology of some orofacial deformities. To learn more about the relationship between tongue function and the form of orofacial structures, it is important to recognize patients with abnormal swallowing patterns. A cushion scanning technique in combination with M-mode ultrasound was applied to measure and compare tongue movements between mature swallowing and tongue-thrust swallowing. Forty subjects with a mature swallowing pattern (23 female, 17 male, aged 21.8 +/- 6.1 years) and 15 subjects with a tongue-thrust swallowing pattern (8 female, 7 male, aged 13.6 +/- 6.6 years) were included in this study. Duration, range, speed, and reproducibility for each of the swallowing subphases were calculated and compared. Tongue-thrust swallowers had a longer late transport phase than mature swallowers (P <.0009), and the tongue speed was faster in the early final phase (P <.05) compared with mature swallowers. Distinctly different movements can be positively differentiated with the method used.

Adolescent↗
PubMed2004

Bonding and debonding characteristics of APC-plus clarity brackets compared to APC clarity brackets.

AIM: To investigate whether adding light-sensitive pigments (APC-Plus) has a significant effect on the times required for placing and debonding brackets compared with conventional APC brackets. METHODS: Eighty extracted human permanent central incisors were bonded with APC ceramic brackets and APC-Plus ceramic brackets by four clinicians, and the times required were recorded. After thermocycling, the brackets were debonded. Adhesive remnants were removed by the same clinicians using four different instruments. The times required were recorded, and the enamel surfaces were checked for morphologic changes via scanning electron microscope. RESULTS: Two clinicians needed significantly more time for bonding of the APC-Plus brackets (P < .05). For debonding, no significant differences could be found between APC and APC-Plus brackets for any of the instruments. The diamond burs and the conventional carbide burs required significantly less time than the Radlanski burs. The air-powder abrasive system took the longest time. The diamond burs caused substantial destruction of the enamel surface, whereas the Radlanski bur and the air-powder abrasive system left the surface intact. CONCLUSION: The time needed for placement of the brackets and removal of adhesive remnants was not affected by adding light-sensitive pigments. For debonding, Radlanski burs and conventional carbide burs can be used, while diamond burs should be avoided.

Adhesives↗
PubMed2003

Differential diagnosis between infantile and mature swallowing with ultrasonography.

In order to investigate the difference in tongue movement between visceral (infantile) and somatic (mature) swallowing patterns, 12 visceral (seven females, five males) and 14 somatic (eight females, six males) swallowers were examined with the B+M-mode ultrasound technique. Movements of the tongue tip and submental musculature during swallowing were recorded on video cassette and evaluated with a personal computer. The results demonstrated that the tongue dorsal surface, which was thought to be ideal for observing tongue function, was not suitable for differentiating between visceral and somatic swallowing patterns. Conversely, the movements of the genioglossus muscle were found to be identical within groups but significantly different (P < 0.01) from each other between the two swallowing patterns. Therefore, the genioglossus muscle can serve as a reliable means for differentiating between visceral and somatic swallowers.

Adolescent↗