A total of 203 resin-bonded bridges was inserted under controlled clinical conditions and evaluated for a number of patient-dependent variables over a period of 5 years. Of the variables evaluated only 'initial occlusion of the abutment teeth' and 'location in the dental arch' had a significant influence on the retention of resin-bonded bridges. Anterior resin-bonded bridges were more durable than posterior bridges. Mandibular posterior bridges showed the lowest retention ratio. It is concluded that the design of posterior resin-bonded bridges should include tooth preparation or a wrap-around design of the retainers.
A total of 203 resin-bonded bridges were inserted under controlled clinical conditions and evaluated over a period of 5 years. During the evaluation period there were 47 dislodgements and 30 pontic fractures. The majority of the failures were retreated successfully. Dislodgement was in most cases due to fracture at the resin/retainer interface. The small number of fractures at the resin/tooth interface indicate that the clinical procedures, as used in this study, were satisfactory. Dislodged and rebonded resin-bonded bridges had a lower retention than original bonded bridges, indicating that patients with a dislodged bridge are a risk group for the retention of rebonded bridges. However, possible factors that may be responsible for this higher risk could not be demonstrated. The bridges which were removed for repair of the pontics and rebonded showed an acceptable retention. There was no relationship between the failure characteristic and the retainer type or the cementation material used.
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