©The Park Row Dental Practice 2009 - 2019 The Park Row Dental Practice Home Who What Contact Search Tech. Links About Faq Education Dentotron Missing tooth / Gap  Causes. 1. Trauma. 2. Extraction. 3. Tooth never developed.  Treatment. 1. Trauma: Reimplantation; bridge; denture. 2. Extraction: Bridge; denture. 3. Undeveloped: Bridge; denture.