Rebonding of resin bonded bridge to a displaced abutment tooth, which has been moved into its original position by orthodontic treatment | Rebonding av resinretinerad bro efter ortodontisk tillbakaflyttning av stödtand - en fallbeskrivning.

link_to_subscribed_fulltex

Implant periapical lesion

One complication in implant dentistry is the implant periapical lesion. This case report describes a 30-year-old man who after an injury was treated with a single implant that caused a fistula that appeared four months after the implant installation. Proper pharmaceutical intervention was not successful. The fistula did not disappear until the apical part of the implant together with granulomatous tissue was surgically removed. It is concluded that an extended period of pain after implant installation might be an early indication that the treatment is not uneventful, that a fistula always should lead up to a fistulography, and that the condition can be successfully treated with surgery

Porcelain bonding to titanium with two veneering principles and two firing temperatures

Dental literature, as well as dental laboratories, has described problems with ceramic veneering of titanium, while clinical and in vitro studies have reported good results. The objective of this study was to investigate the effect of firing temperature, thermo cycling, and veneering methods on bond strength between porcelain and titanium. Eighty titanium specimens were prepared with one of two methods:a bonding agent firing or an oxidation firing. During veneering, half of the specimens in each group were fired at 30 C above and half at the manufacturer's recommended temperature. In the bonding agent group and in the oxidation group, half of each firing group was thermocycled. Bond strength was calculated in a three-point bending test. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analyses of the titanium and the porcelain fracture surfaces of one specimen from each subgroup was used in order to study the composition of the interface between titanium and porcelain surfaces after fracture. No significant difference in bond strength was found when firing at a higher temperature compared with firing at the recommended temperature. An oxidation firing before veneering yielded significantly higher bond strength in a three-point bending test than when firing with a bonding agent. SEM and EDS analyses indicated a higher frequency of titanium oxide fractures in the oxidation than in the bonding agent group. The main finding is that firing at 30 degrees C above the recommended temperature does not significantly affect bond strength between titanium and porcelain. SEM and EDS analysis indicate that fractures occur in the titanium oxide layer by oxidation firing and in the interface between titanium oxide layer and veneering material by bonding agent firing. This finding might indicate that three-point bending test is not a relevant method for determining bond strength in this case, since the firing methods might influence the ductility of the samples

Porcelain bonding to titanium with two veneering principles and two firing temperatures

Dental literature, as well as dental laboratories, has described problems with ceramic veneering of titanium, while clinical and in vitro studies have reported good results. The objective of this study was to investigate the effect of firing temperature, thermo cycling, and veneering methods on bond strength between porcelain and titanium. Eighty titanium specimens were prepared with one of two methods:a bonding agent firing or an oxidation firing. During veneering, half of the specimens in each group were fired at 30 C above and half at the manufacturer\u27s recommended temperature. In the bonding agent group and in the oxidation group, half of each firing group was thermocycled. Bond strength was calculated in a three-point bending test. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analyses of the titanium and the porcelain fracture surfaces of one specimen from each subgroup was used in order to study the composition of the interface between titanium and porcelain surfaces after fracture. No significant difference in bond strength was found when firing at a higher temperature compared with firing at the recommended temperature. An oxidation firing before veneering yielded significantly higher bond strength in a three-point bending test than when firing with a bonding agent. SEM and EDS analyses indicated a higher frequency of titanium oxide fractures in the oxidation than in the bonding agent group. The main finding is that firing at 30 degrees C above the recommended temperature does not significantly affect bond strength between titanium and porcelain. SEM and EDS analysis indicate that fractures occur in the titanium oxide layer by oxidation firing and in the interface between titanium oxide layer and veneering material by bonding agent firing. This finding might indicate that three-point bending test is not a relevant method for determining bond strength in this case, since the firing methods might influence the ductility of the samples

All-ceramic fixed partial dentures designed according to the DC-Zirkon (R) technique. A 2-year clinical study

The aim of the study was to investigate whether the properties of a pre-sintered, hot iso-static post-compacted ( HIP) ZrO2 are adequate for use in three-five-unit fixed partial dentures (FPDs) and to evaluate the clinical results. Twenty three five-unit FPDs were fabricated for 18 patients on a total of 56 abutments. They were all made on abutments cut with a shoulder preparation and cemented with a zinc phosphate cement. They were clinically followed for 24 months. After 24 months all FPDs were still in use without any fractures or clinical wear but in three cases (15%) minor chip-of fractures were observed. Marginal integrity was rated excellent at 45 abutments and acceptable at 11. Within the limitations of this 2-year clinical follow-up study, FPDs made of pre-sintered HIP ZrO2 core material veneered with a compatible ceramic is an acceptable alternative in the fabrication of FPDs with the extensions investigated in this study. Special attention, however, must be paid to designing the core for an occlusal shape that provides sufficient support for the veneer