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Bonding effects of primers
J. Dent.
1986;
14:
135-l
International
36 Printed in Great Britain
135
Abstracts
Wurzeloberflachenkaries bei Patienten mit Parodontalerkrankungen. Zusammenhang mit der individuellen Mundhygiene und der parodontalen Entzundung (Root face caries in patients with periodontal diseases: associations between oral and periodontal hygiene.) Raetzke P. (1985) Dtsch. Zahnaertzl. Z 40, 775-777. The purpose of this study was to determine whether plaque scores and severity of inflammation could serve as indicators of susceptibility to root-surface caries in patients with periodontal disease. Pocket depths and plaque and sulcus bleeding index values were recorded for 153 patients with gingival recession. Seventy-eight of these patients had one or more carious or restored root surfaces. Comparisons of the data obtained from the patients with and without root-surface caries and restorations failed to reveal any significant differences. It is concluded that factors such as food preferences, the indigenous microflora and the degree of cemental mineralization may play a decisive role in the development of caries in root surfaces (1 1 references) W. Kullmann Schmelzveranderungen nach Thermotest (Structural enamel changes after sensitivity testing) Eifinger F. F. (1985) Z Stomatol 82, 205-214. Using an infrared camera structural alterations have been demonstrated in the enamel of extracted human teeth (n = 100) following applications of dichlorodifluromethane (CCI,F,) and solid carbon dioxide (dry ice). These studies confirm that either direct spraying with CCI,F, or direct contact with dry ice causes cracks within enamel Application of dry ice tends to cause more cracks than application of CCI,F,. While touching enamel with a small piece of plastic sponge sprayed with CC&F, does not cause alterations in enamel if the time of application is limited to 1 s, cracks may occur when such applications are extended to 3 s or more. Clinical investigations confirm that applications of a small piece of plastic sponge sprayed with CC&F, for periods of up to 1 s are generally sufficient for diagnostic purposes (20 references) W. Kullmann Verbundeffekte mit Primern. (Bonding effects of primers) Nolden R (1985) Dtsch. Zahnaertzl Z 40, 935-939. With the aid of the primers Dentin-Adhesit (Vivadent Schaan, Liechtenstein) and Scotchbond (3M Co, St Paul, USA) a reasonable bond can be established between composite resins and hard tooth tissues By means of a measured. when used in conjunction with lsopast
tensile test. the bond strengths of the adhesives were (Vivadent) and Concise (3M Co.). The materials were applied to enamel and dentine with a special contouring device, and either stored for 3 or 21 d in water (37°C) or thermocycles between 4°C and 65°C Without etching, the bond to dentine was stronger than to enamel. Etching resulted in an increase in the bond strength to enamel. This effect seemed to be due to mechanical retention rather than to chemical bonding of the primer. The bond strength to dentine and unetched enamel was considerably reduced by temperature changes By contrast the bond to etched enamel increased by temperature change When considering the results obtained with dentine, it is necessary to take account of the problems associated with direct applications of adhesives without pulp protection, (5 references) Author’s abstract (selected and translated by W. Kullmann) Feingenwebliche Veranderungen des PuIpaDentin Systems nach Praparationstrauma und Applikation von Phosphatzement( Histological alterations of the pulp-dentin system after a trauma due to cavity preparation and application of phosphate cement) Rutsatz K., Sobkowiak E. M. et al. (1985) Zahn Mund Kieferheilkd 73, 123-l 3 1. Histological alterations in the pulp-dentine system were investigated in the teeth of dogs 24 h, 14 d and 28 d following controlled cavity preparation and the application of a phosphate cement In most of the cases investigated following only cavity preparation, little, if any, alterations were observed in the pulp-dentine system. The application of the phosphate cement resulted in more marked alterations The degree of alterations increased with reductions in remaining dentine thickness The authors recommend extreme caution when considering the application of phosphate cements in deep cavities (3 1 references) W. Kullmann Experimental animal study of materials for dental implants. Chen An Yu, Cen Yuan Kun, Mao Xiang Yan et al. (1985) J Clin Stomatol 1, 154-l 57. Pin, post blade and screw implants made of titanium alloys (Tc4 and Tea), titanium coated with aluminium oxide, mono and polycrystalline aluminium oxide and isotropic carbon were investigated in this study. Following sterilization, the implants were placed in the jaws of dogs under intravenous anaesthesia. The dogs were sacrificed between 45 d and 388 d after the operation. Histological
1986;
14:
135-l
International
36 Printed in Great Britain
135
Abstracts
Wurzeloberflachenkaries bei Patienten mit Parodontalerkrankungen. Zusammenhang mit der individuellen Mundhygiene und der parodontalen Entzundung (Root face caries in patients with periodontal diseases: associations between oral and periodontal hygiene.) Raetzke P. (1985) Dtsch. Zahnaertzl. Z 40, 775-777. The purpose of this study was to determine whether plaque scores and severity of inflammation could serve as indicators of susceptibility to root-surface caries in patients with periodontal disease. Pocket depths and plaque and sulcus bleeding index values were recorded for 153 patients with gingival recession. Seventy-eight of these patients had one or more carious or restored root surfaces. Comparisons of the data obtained from the patients with and without root-surface caries and restorations failed to reveal any significant differences. It is concluded that factors such as food preferences, the indigenous microflora and the degree of cemental mineralization may play a decisive role in the development of caries in root surfaces (1 1 references) W. Kullmann Schmelzveranderungen nach Thermotest (Structural enamel changes after sensitivity testing) Eifinger F. F. (1985) Z Stomatol 82, 205-214. Using an infrared camera structural alterations have been demonstrated in the enamel of extracted human teeth (n = 100) following applications of dichlorodifluromethane (CCI,F,) and solid carbon dioxide (dry ice). These studies confirm that either direct spraying with CCI,F, or direct contact with dry ice causes cracks within enamel Application of dry ice tends to cause more cracks than application of CCI,F,. While touching enamel with a small piece of plastic sponge sprayed with CC&F, does not cause alterations in enamel if the time of application is limited to 1 s, cracks may occur when such applications are extended to 3 s or more. Clinical investigations confirm that applications of a small piece of plastic sponge sprayed with CC&F, for periods of up to 1 s are generally sufficient for diagnostic purposes (20 references) W. Kullmann Verbundeffekte mit Primern. (Bonding effects of primers) Nolden R (1985) Dtsch. Zahnaertzl Z 40, 935-939. With the aid of the primers Dentin-Adhesit (Vivadent Schaan, Liechtenstein) and Scotchbond (3M Co, St Paul, USA) a reasonable bond can be established between composite resins and hard tooth tissues By means of a measured. when used in conjunction with lsopast
tensile test. the bond strengths of the adhesives were (Vivadent) and Concise (3M Co.). The materials were applied to enamel and dentine with a special contouring device, and either stored for 3 or 21 d in water (37°C) or thermocycles between 4°C and 65°C Without etching, the bond to dentine was stronger than to enamel. Etching resulted in an increase in the bond strength to enamel. This effect seemed to be due to mechanical retention rather than to chemical bonding of the primer. The bond strength to dentine and unetched enamel was considerably reduced by temperature changes By contrast the bond to etched enamel increased by temperature change When considering the results obtained with dentine, it is necessary to take account of the problems associated with direct applications of adhesives without pulp protection, (5 references) Author’s abstract (selected and translated by W. Kullmann) Feingenwebliche Veranderungen des PuIpaDentin Systems nach Praparationstrauma und Applikation von Phosphatzement( Histological alterations of the pulp-dentin system after a trauma due to cavity preparation and application of phosphate cement) Rutsatz K., Sobkowiak E. M. et al. (1985) Zahn Mund Kieferheilkd 73, 123-l 3 1. Histological alterations in the pulp-dentine system were investigated in the teeth of dogs 24 h, 14 d and 28 d following controlled cavity preparation and the application of a phosphate cement In most of the cases investigated following only cavity preparation, little, if any, alterations were observed in the pulp-dentine system. The application of the phosphate cement resulted in more marked alterations The degree of alterations increased with reductions in remaining dentine thickness The authors recommend extreme caution when considering the application of phosphate cements in deep cavities (3 1 references) W. Kullmann Experimental animal study of materials for dental implants. Chen An Yu, Cen Yuan Kun, Mao Xiang Yan et al. (1985) J Clin Stomatol 1, 154-l 57. Pin, post blade and screw implants made of titanium alloys (Tc4 and Tea), titanium coated with aluminium oxide, mono and polycrystalline aluminium oxide and isotropic carbon were investigated in this study. Following sterilization, the implants were placed in the jaws of dogs under intravenous anaesthesia. The dogs were sacrificed between 45 d and 388 d after the operation. Histological