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Sedation for conservative dentistry: further studies on inhalation sedation with 25 per cent nitrous oxide
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HOBKIRK J. A. Grinding technique, surface texture and strength of vitreous carbon and high purity alumina, J. Dent 5 (1977) 219-226. Vitreous carbon and alumina, potentially good implant materials, must frequently be shaped by grinding. Rods of these materials were ground by two standard methods. The subsequent surface textures were examined with a Talysurf machine and with a scanning electron microscope. The surface textures were related to the material and the grinding technique. The modulus of rupture of thesa materials was determined over span to depth ratios of 10 : 1 and 2 : 1. In addition, the impact energy of the specimens was determined. The rods tested over the lower span to depth ratio had a higher observed modulus of rupture. Vitreous carbon was markedly weaker than alumina and had a lower impactenergy. The modulus of rupture and impact energy of the alumina specimens were considerably less affected by the surface texture of the specimens than ware those of the vitreous carbon rods. It is recommended that ceramic implants be manufactured with as smooth a surface texture as possible. GREEN R. V., MEILMAN P., ROUTH D. K. and MclVER F. T. Preparing the preschool child for a visit to the dentist, J. Dent. 5 (1977) 231-236. Two commercial films were evaluated in comparison with a cartoon and no film for preparing preschool children for a dental examination and prophylaxis. The participants in the study were 145 children, who were assigned randomly to the four exparimental conditions. The commercial films did not appear to have any significant advantage over control conditions. Older children were significantly better behaved in the dental surgery and took less of the dentist’s time. RIDER M. The shear strength of enameleomposite bonds, J. Dent 5 (1977) 237-244. The shear bond strengths of several commercial materials to etched enamel were evaluated using a modified punch test. An overall significant difference between the bond strength values for the composites was established. Increasing the punch speed was observed to have a detrimental effect on shear bond
Journal of Dentistry, Vol. ~/NO. 3
strength, and investigations into different enamel surface preparations revealed that a clinically ground surface may be too rough for optimum bonding. PREISKEL H. W. The distal extension prosthasis reappraised, J. Dent. 5 (1977) 227-230. The removable distal extension partial denture is capable of causing severe damage to the remaining dentition and edentulous ridges, which is a far cry from de Van’s maxim of preserving the tissues that remain (de Van, 1952). Patient selection is important. The operator requires knowledge in all the subjects related to prosthodontics coupled with technical expertise to make the prosthesis. Skilful and conscious maintenance therapy is equally important. If these criteria cannot be satisfied the denture is best not made. Providing a satisfactory prosthodontic service requires experience and skills of a very high order of magnitude. Perhaps the most important point is to convince both the general public and the rest of the dental profession of this fact. EDMUNDS D. H. and ROSEN M. Sedation for conservative dentistry: further studies on inhalation sadation with 25 per cent nitrous oxide, .I. Dent 5 (1977) 245-251. The effectiveness of inhalation sedation with 25 per cent nitrous oxide was compared with sedation with intravenous diazepam in a group of 25 extremely anxious dental patients who experienced both methods in a total of 77 treatments. The two techniques were very effective but inhalation sedation saemed to have a number of advantagas. No patient refused treatment with nitrous oxide whereas 7 refused intravenous diazepam. The induction and recovery times were significantly shorter with nitrous oxide and the standard of dental treatment was better. A trial of inhalation sedation is also reported with 5 different operators who treated 30 anxious patients on 95 occasions. Twenty-eight patients completed their course of treatment satisfactorily. The standard of dentistry was judged good or satisfactory on 93 occasions. Inhalation sedation seems worthy of further investigation.
HOBKIRK J. A. Grinding technique, surface texture and strength of vitreous carbon and high purity alumina, J. Dent 5 (1977) 219-226. Vitreous carbon and alumina, potentially good implant materials, must frequently be shaped by grinding. Rods of these materials were ground by two standard methods. The subsequent surface textures were examined with a Talysurf machine and with a scanning electron microscope. The surface textures were related to the material and the grinding technique. The modulus of rupture of thesa materials was determined over span to depth ratios of 10 : 1 and 2 : 1. In addition, the impact energy of the specimens was determined. The rods tested over the lower span to depth ratio had a higher observed modulus of rupture. Vitreous carbon was markedly weaker than alumina and had a lower impactenergy. The modulus of rupture and impact energy of the alumina specimens were considerably less affected by the surface texture of the specimens than ware those of the vitreous carbon rods. It is recommended that ceramic implants be manufactured with as smooth a surface texture as possible. GREEN R. V., MEILMAN P., ROUTH D. K. and MclVER F. T. Preparing the preschool child for a visit to the dentist, J. Dent. 5 (1977) 231-236. Two commercial films were evaluated in comparison with a cartoon and no film for preparing preschool children for a dental examination and prophylaxis. The participants in the study were 145 children, who were assigned randomly to the four exparimental conditions. The commercial films did not appear to have any significant advantage over control conditions. Older children were significantly better behaved in the dental surgery and took less of the dentist’s time. RIDER M. The shear strength of enameleomposite bonds, J. Dent 5 (1977) 237-244. The shear bond strengths of several commercial materials to etched enamel were evaluated using a modified punch test. An overall significant difference between the bond strength values for the composites was established. Increasing the punch speed was observed to have a detrimental effect on shear bond
Journal of Dentistry, Vol. ~/NO. 3
strength, and investigations into different enamel surface preparations revealed that a clinically ground surface may be too rough for optimum bonding. PREISKEL H. W. The distal extension prosthasis reappraised, J. Dent. 5 (1977) 227-230. The removable distal extension partial denture is capable of causing severe damage to the remaining dentition and edentulous ridges, which is a far cry from de Van’s maxim of preserving the tissues that remain (de Van, 1952). Patient selection is important. The operator requires knowledge in all the subjects related to prosthodontics coupled with technical expertise to make the prosthesis. Skilful and conscious maintenance therapy is equally important. If these criteria cannot be satisfied the denture is best not made. Providing a satisfactory prosthodontic service requires experience and skills of a very high order of magnitude. Perhaps the most important point is to convince both the general public and the rest of the dental profession of this fact. EDMUNDS D. H. and ROSEN M. Sedation for conservative dentistry: further studies on inhalation sadation with 25 per cent nitrous oxide, .I. Dent 5 (1977) 245-251. The effectiveness of inhalation sedation with 25 per cent nitrous oxide was compared with sedation with intravenous diazepam in a group of 25 extremely anxious dental patients who experienced both methods in a total of 77 treatments. The two techniques were very effective but inhalation sedation saemed to have a number of advantagas. No patient refused treatment with nitrous oxide whereas 7 refused intravenous diazepam. The induction and recovery times were significantly shorter with nitrous oxide and the standard of dental treatment was better. A trial of inhalation sedation is also reported with 5 different operators who treated 30 anxious patients on 95 occasions. Twenty-eight patients completed their course of treatment satisfactorily. The standard of dentistry was judged good or satisfactory on 93 occasions. Inhalation sedation seems worthy of further investigation.