An antifriction shell (1; 2; 3) for pivoting elements (101; 201) of a mechanical timepiece movement (15; 25), characterized in that said antifriction shell (1; 2; 3) is made of a silicon-ceramic based on hybrid organic-inorganic SZ2080 zirconium-silicon acrylate photopolymer material, wherein said antifriction shell (1; 2; 3) has an elongated body (11; 21; 31) defined along an axis of symmetry (X1; X2; X3) and provided with a head end (111; 211; 311) and a bottom end (112; 212; 312) opposite to each other, and wherein said elongated body (11; 21; 31) comprises a blind central hole defined along said axis of symmetry (X1; X2; X3) at said head end (111; 211; 311), wherein said antifriction shell (1; 2; 3) is obtained by a process comprising the following phases: - producing an intermediate crystalline structure of said elongated body (11; 21; 31) by irradiating with a femtosecond laser said hybrid organic-inorganic SZ2080 zirconium-silicon acrylate sol-gel, wherein said intermediate crystalline structure has the same shape and dimension greater than the final structure of said elongated body (11; 21; 31); - heat-treating said intermediate crystalline structure to obtain said final structure of said elongated body (11; 21; 31) thus defining a ceramic phase by the silica and zirconia precursors present in said hybrid organic-inorganic SZ2080 zirconium-silicon acrylate sol-gel, wherein said phase of heat-treating reduces the dimension of said intermediate crystalline structure to a dimension appropriate to said final structure without distortions of said shape.. wherein said antifriction shell (1; 2; 3) has an elongated body (11; 21; 31) defined along an axis of symmetry (X1; X2; X3) and provided with a head end (111; 211; 311) and a bottom end (112; 212; 312) opposite to each other, and wherein said elongated body (11; 21; 31) comprises a blind central hole defined along said axis of symmetry (X1; X2; X3) at said head end (111; 211; 311), wherein said antifriction shell (1; 2; 3) is obtained by a process comprising the following phases: - producing an intermediate crystalline structure of said elongated body (11; 21; 31) by irradiating with a femtosecond laser said hybrid organic-inorganic SZ2080 zirconium-silicon acrylate sol-gel, wherein said intermediate crystalline structure has the same shape and dimension greater than the final structure of said elongated body (11; 21; 31); - heat-treating said intermediate crystalline structure to obtain said final structure of said elongated body (11; 21; 31) thus defining a ceramic phase by the silica and zirconia precursors present in said hybrid organic-inorganic SZ2080 zirconium-silicon acrylate sol-gel, wherein said phase of heat-treating reduces the dimension of said intermediate crystalline structure to a dimension appropriate to said final structure without distortions of said shape.. - producing an intermediate crystalline structure of said elongated body (11; 21; 31) by irradiating with a femtosecond laser said hybrid organic-inorganic SZ2080 zirconium-silicon acrylate sol-gel, wherein said intermediate crystalline structure has the same shape and dimension greater than the final structure of said elongated body (11; 21; 31); - heat-treating said intermediate crystalline structure to obtain said final structure of said elongated body (11; 21; 31) thus defining a ceramic phase by the silica and zirconia precursors present in said hybrid organic-inorganic SZ2080 zirconium-silicon acrylate sol-gel, wherein said phase of heat-treating reduces the dimension of said intermediate crystalline structure to a dimension appropriate to said final structure without distortions of said shape.. <EOS>