Inclusion Criteria:  -The participants are in the age of more than 20 years old and not more than 80 years old.  The participants who have a transmucosal implant system (Straumann TL RN/WN, Institut Straumann, AG, Basel, Switzerland) placed in single-tooth gap in the area of premolar or molar regions in the maxilla and mandible with existing interproximal and antagonist contacts. The participants' general medical health is healthy or has a well-controlled systemic disease. The participants' general oral health has shown no sign of infection or unsuccessfully treated diseases such as chronic periodontitis.  Exclusion Criteria:  The participants who are smoking more than 10 cigarettes per day. The participants with pregnancy. The participants with a psychiatric disorder The participants with a history of radiation therapy at the head and neck area. The participants with a history of chemotherapy. The participants with bony pathologies such as osseous dysplasia, odontogenic cyst or tumor, etc.