Background:　The　existing　augmented　reality　(AR)　dental　implant　surgery　navigation　system　usually　uses　markers　to　complete　image　guidance.　However,　markers　often　affect　dentists＇　operations　and　make　patients　uncomfortable.　Methods:　To　solve　the　problems　caused　by　markers,　this　paper　proposes　an　effective　marker-less　image　guidance　method.　After　initialisation　is　completed　by　contour　matching,　the　corresponding　relationship　is　obtained　by　matching　the　feature　points　between　the　current　frame　and　the　preloaded　initial　frame.　The　camera　pose　is　estimated　by　solving　the　Perspective-n-Point　problem.　Results:　The　registration　error　of　AR　images　is　0.731 ± 0.144 mm.　The　planting　errors　are　1.174 ± 0.241 mm　at　the　neck,　1.433 ± 0.389 mm　at　the　apex　and　5.566 ± 2.102°　for　the　angle.　The　maximum　error　and　standard　deviation　meet　the　clinical　requirements.　Conclusions:　We　demonstrate　that　the　proposed　method　can　accurately　guide　dentists　to　perform　dental　implant　surgery.　©　2023　John　Wiley　&　Sons　Ltd.