## 3 Results  
In the first stage we compared, at the intra-group level, the average values of the bone gain (width and osteodensity) for sex, age groups, and the location of the augmented implant sites.  
The bone gain (width) values for each group are presented in Figure 2a,b. In the control group (S-GBR + bovine xenograft), the bone gain (width) was higher in male patients (4.5100 mm vs. 4.3150 mm), age group 40-59 years (4.7225 mm vs. 4.1450 mm), and the posterior dental group (4.4954 mm vs. 4.1580 mm). In the test group (S-GBR + porcine xenograft), the bone gain (width) was higher in female patients (6.4885 mm vs. 5.2075 mm), age group 60-79 (6.5185 mm vs. 5.1750 mm), and the posterior dental group (6.0971 mm vs. 5.3988 mm).  
The bone gain (osteodensity) values for each group are presented in Figure 3a,b. In the control group (S-GBR + bovine xenograft), the bone gain (osteodensity) was higher in female patients (319.90 HU vs. 4.3150 mm), age group 40-59 years (303.00 HU vs. 255.90 HU), and the anterior dental group (334.60 HU vs. 254.61 HU). In the test group (S-GBR + porcine xenograft), the bone gain (osteodensity) was higher in male patients (268.50 vs. 241.07 HU), age group 40-59 years (279.91 HU vs. 230.53 HU), and the posterior dental group (270.70 HU vs. 219.25 HU).  
Figure 1: **(a)** A.C., aged 65. Preoperative intraoral view. **(b)** Preoperative CBCT images and alveolar bone parameters measured with Sidexis XG/ DVT (Densply/Sirona) software. **(c)** Intraoral view after the insertion of osteosynthesis screws and implants. **(d)** Intraoral view after the mandibular alveolar reconstruction with S-GBR technique and porcine xenograft. **(e)** Postoperative intraoral view after wound suture and temporary loading. **(f)** Alveolar bone width values measured at baseline **(left)** and at 6 months follow-up with Sidexis XG/ DVT software (Densply/Sirona). **(g)** Alveolar bone width values measured at baseline **(left)** and at 6 months follow-up with Sidexis XG/ DVT software (Densply/Sirona). **(h)** Alveolar bone width values measured at baseline **(left)** and at 6 months follow-up with Sidexis XG/ DVT software (Densply/Sirona). **(i)** Alveolar bone width values measured at baseline **(left)** and at 6 months follow-up with Sidexis XG/DVT software (Densply/Sirona). **(j)** Alveolar bone osteotomy values measured at baseline **(left)** and at 6 months follow-up with Sidexis XG/DVT software (Densply/Sirona). **(k)** Alveolar bone osteotomy values measured at baseline **(left)** and at 6 months follow-up **(right)** (implant site 4.1). **(k)** Alveolar bone osteotomy values measured at baseline **(left)** and at 6 months follow-up **(right)** (implant site 4.5). **(l)** Alveolar bone osteotomy values measured at baseline **(left)** and at 6 months follow-up **(right)** (implant site 3.2). **(m)** Alveolar bone osteotomy values measured at baseline **(left)** and at 6 months follow-up **(right)** (implant site 3.5). **(n)** Preloading intraoral view. **(o)** Postloading intraoral view.  
Figure 2: (**a**) Comparisons of bone gain (width) for sex, age groups, location of implant sites. Control group (S-GBR + bovine-derived xenograft). (**b**) Comparisons of bone gain (width) for sex, age groups, location of implant sites. Test group (S-GBR + porcine-derived xenograft).  
Intergroup comparisons regarding the bone gain (width and osteotomy) are presented in Figure 4a,b. The mean values (control group vs. test group) are as follows: width (4.107 mm vs. 4.1624 mm); osteotomy (276.83 HU vs. 254.24 HU).  
Figure 3: (**a**) Comparisons of bone gain (osteodensity) for sex, age groups, location of implant sites. Control group (S-GBR + bovine-derived xenograft). (**b**) Comparisons of bone gain (osteodensity) for sex, age groups, location of implant sites. Test group (S-GBR + porcine-derived xenograft).  
The statistical analysis found the absence of statistically significant differences between the two groups regarding the bone gain at 6 months follow-up (width, osteodensity) (Table 4).