Novelty (related to prior arts)
(Conclusion) Novelty should be found. (Design right owner won.)
Since the concumers of artificial teeth are specialists like dentists, and they select artificial teeth by noticing the difference in small form, such a small difference should be also recognized by them. ⇒Not similar.
<Writer: Hideki Takaishi (Attorney-at-law licensed in Japan and California)>
https://www.ip.courts.go.jp/app/files/hanrei_en/720/000720.pdf