Impact of Abutment Angulation and Crown–Implant Ratio on Peri-Implant Bone Loss Severity in Posterior Internal-Connection Implants: A Two-Year Retrospective Study. - Ha, Yeon-Joo; Kim, Yong-Gun; Hwang, Sung-Min; Lee, Jae-Mok (Applied Sciences (2076-3417), 2026)