Management of Schneiderian membrane perforations during maxillary sinus floor augmentation with lateral approach in relation to subsequent implant survival rates: a systematic review and meta-analysis

International Journal of Implant Dentistry

Table 6 Quality assessment of included studies using the Newcastle-Ottawa scale

	Park et al. [4]	Beck-Broichsitter et al. [47]	Ferreira et al. [16]	Öncü E et al. [19]	Froum et al. [48]	Oh E et al. [49]	Hernández-Alfaro et al. [50]
Selection
• Representativeness of the exposed cohort	0	0	0	0	*	0	*
• Selection of the non-exposed cohort	*	*	*	*	*	*	*
• Ascertainment of exposure	*	*	*	*	*	*	*
• Demonstration that outcome of interest was not present at start of study	*	*	*	*	*	*	*
Comparability
• Study controls for bone ring group	0	0	0	0	0	0	0
• Study controls for any additional factor (duration of exposure)	*	*	*	*	*	*	*
Outcome
• Assessment of outcome	0	0	0	0	0	0	*
• Was follow-up long enough for outcomes to occur?	*	*	*	0	*	*	0
• Adequacy of follow-up of cohorts	*	*	*	*	*	*	*
Newcastle-Ottawa scale	6	6	6	5	7	6	7