Avoiding perforations during post preparation.
D003442:Crowns / Q000009:adverse effects*; D003737:Dental Cavity Preparation / Q000009:adverse effects* / Q000295:instrumentation; D003786:Dental Pulp Cavity / Q000033:anatomy & histology; D006801:Humans; D011176:Post and Core Technique / Q000009:adverse effects*; D012389:Root Canal Obturation; D014092:Tooth Root / Q000293:injuries*